Jonel, yes we have our DUB Interchangeable Supercharger Pulley Unit for the
new Cobalt units, from sizes 3.4" down to 2.60" . Hope this helps, as you
will need to remove the 4 bolts securing the supercharger to remove the
stock pulley and install our new unit. This is about an hour job to make
this change. Hope this helps.

http://www.southfloridapulleyhq.com/

well, as soon as someone can get one we'll see if this just creates heat like everyone says or if it actually wakes the car up a bit.....thanks for posting this!

What size pulley comes stock on the 2L S/C?

I'm wondering how Psi-fi got 20PSI of boost from the 2.0L. Did they put a smaller pulley on the SC?

puttting a pulley on a sc is just going to hurt your car....dont even think about the mod

why would putting a smaller pulley on the supercharger hurt the car?? That's how to make more boost with a s/c motor the safe way. It's like getting a boost controller for a turboed vehicle and turning up the boost a little. It's not gonna hurt anything as long as you're not pushing 20 psi through that motor continuously. The 270 hp cobalt they had at the sema show was pushing 16 lbs of boost with not problem and I believe stock is 12, so this ^^^ is an unfounded response.

puttting a pulley on a sc is just going to hurt your car....dont even think about the mod

It will just cause damage and yield no performance improvement, if you don't take care if the fact that the car is boost limited at 12psi first, your SC will be making more boost but no more will get to the engine it will be wasted by the bipass valve. Second it would be a good idea to remove some heat from the system before adding it, or you will get reliability issues.

Or maybe he is refering to this article that guy on the redline forum wrote about the m62 already being at max efficiency.

http://www.******************/showthread.php?t=81&highlight=smaller+pulley (http://)

i'm sure a lower thermostat will help things, but i'd like to see the results on a redline before going out to buy a pulley upgrade it. they can make it, but have they tried it, i'd be wary of that, as there has already been a smaller pully tried out (hearsay) and it apparantly fried the blower.

after 3 pulls on the dyno, the coolant on our test car was coming out the overflow (intercooler), so increasing heat will NOT be a good thing

after actually looking at the link, it's for the m90/m112, nothing for the cobalt/redline...

after actually looking at the link, it's for the m90/m112, nothing for the cobalt/redline...

Pulley's for the M90/M112 will work on the M62 and M45

Pulley's for the M90/M112 will work on the M62 and M45

that doesn't mean that they should be used on the redline/cobalt...

that doesn't mean that they should be used on the redline/cobalt...

A Pulley is a Pulley. It not going to break anything. They're all press on pulley's

you're missing my point, the fact is that this is advertised in the forum as a pulley for the 2.0s/c, but it's not, i don't want anyone going out to do this, messing up their blower (from heat) and voiding their warranty stuck with an expensive fix, this shouldn't be messed with unless you know what you're doing. there have been rumors of someone frying their blower by swapping in a smaller pulley, and it shouldn't be done unless you address cooling issues first, not to mention freeing up the exhaust and intake as well

you're missing my point, the fact is that this is advertised in the forum as a pulley for the 2.0s/c, but it's not, i don't want anyone going out to do this, messing up their blower (from heat) and voiding their warranty stuck with an expensive fix, this shouldn't be messed with unless you know what you're doing. there have been rumors of someone frying their blower by swapping in a smaller pulley, and it shouldn't be done unless you address cooling issues first, not to mention freeing up the exhaust and intake as well

I agree, you greatly risk your blower more from not knowing what your settings on the pulley will be. Cooling and more air into the engine would be the first steps before messing with boost in general. Otherwise you won't have a motor :-D

yeah what vita and star said....but do it so you can fuckup your shit

the psi-fi guys are very satisfied with the results from the supercharger so far...

theyve said the cooler is doing a great job at keeping the charge temps down...

I agree, you greatly risk your blower more from not knowing what your settings on the pulley will be. Cooling and more air into the engine would be the first steps before messing with boost in general. Otherwise you won't have a motor :-D


isnt that what a supercharger does?









lol, i know what you mean just messing with you

isnt that what a supercharger does?









lol, i know what you mean just messing with you

lol didnt notice that..well yes it feeds it more air like nothing!

i have herd from a local dealer that gm has a pulley for it and if gm instals it its still under warranty that just what a loccaL dealership it might just be a dealer thing to get more buisness too

i have herd from a local dealer that gm has a pulley for it and if gm instals it its still under warranty that just what a loccaL dealership it might just be a dealer thing to get more buisness too
I think you are right. GM is trying to do what Dodge is doing for the SRT4, have a dealer-made aftermarket.

the guy from at the auto show said was talkin about that.

how much more power/boost does going from 3.4" down to 2.60" make???

how much more power/boost does going from 3.4" down to 2.60" make???

If the measurement is the diameter than then.

3.4 x 3.14 = 10.68"
2.6 x 3.14 = 8.17"

8.17 / 10.68 = 0.76

So for every 3 revs of the stock pulley it's 4 revs of the new pulley. How much more boast? I dunno cause I am not an expert on that stuff but I would think about 20-25% increase in boost. Everyone keeps talking about the roots type blower not having a linear increase in power with RPMs so who knows. Probably won't know until someone does it and puts it on the dyno. Until them all we can do is argue about it :-d

thanks! good stuff

for every 1/4 inch smaller on the pully it gets you about 2 psi.

stock lets say 3.50 pulley is 7 psi
3.25 pulley is 9 psi
3.00 pulley is 11 psi
2.75 pulley is 13 psi
2.50 pulley is 15 psi

so if stock is 3.4 and you go to a 2.6 thats .8 difference which will bring up your boost about 6.5 psi from stock


im thinking stock is about 7 psi right?? going to 10 is most i would go before tuning, injectors etc. even 12 psi you can prob get away with. 3.0 pully prob would do the trick if the stock one was 3.5 inches.

anyone know the stock psi for a cobalt ss and puleysize

cobalt comes with 12psi stock what ive been told

well talked to the pulley place here is their e mail

"Tony, stock is 3.4" and we offer 3.25" = 1.5lb boost increase, 3.10", 3 lb. boost increase, 3.00" , 4 lb. increase over stock. You will have to change the stock belt, to 1/2" smaller, with any of these sizes. 1 lb. boost is 10 horsepower on these cars. Hope this helps, as also regapping the sparkplugs down .005 setting from stock would be beneficial for optimal performance."

so looks like 3 inch pulley most you can go

so 3 inch pulley = 4 more lbs =40 mot hp right? and it will work with the car no problem?

yes 4 lbs willbe about 40 hp. id say 30 hp to play it safe

That sounds really good. There seems to still be a few people saying how "it won't work and it will screw everything up and there will be no power increase", but that sounds like BS to me. The people who actually know what they are talking about, those people being GM and the aftermarket parts maufacturers, seem confident that a smaller pulley will provide a nice power boost over stock.

The numbers quoted so far are look very promising, 30-40HP from a pulley change is very impressive. The stock intercooler should keep the charge temps in check, so we shouldn't really have to worry about that being a issue.

If for each PSI of boost increase the LSJ gains about 10 HP, then with a 3" pulley we should be seeing gains of about 30-40HP. Seeing as Redlines have been dynoing at 200-210 WHP, that should be good for as much as 240HP at the wheels :cssNET:

That sounds really good. There seems to still be a few people saying how "it won't work and it will screw everything up and there will be no power increase", but that sounds like BS to me. The people who actually know what they are talking about, those people being GM and the aftermarket parts maufacturers, seem confident that a smaller pulley will provide a nice power boost over stock.

The numbers quoted so far are look very promising, 30-40HP from a pulley change is very impressive. The stock intercooler should keep the charge temps in check, so we shouldn't really have to worry about that being a issue.

If for each PSI of boost increase the LSJ gains about 10 HP, then with a 3" pulley we should be seeing gains of about 30-40HP. Seeing as Redlines have been dynoing at 200-210 WHP, that should be good for as much as 240HP at the wheels :cssNET:

Add that to the dyno results on scdyne.com, who developed a header for the redline that produces another 20hp and ~20 lb/ft of torque on what I believe is an otherwise stock engine.

I like the aftermarket development already, seems that we shouldn't have to dish out that much cash to see some serious gains from modding this engine.

stock cobalt with header, full exhaust and pully change and 75 shot i think will be close to 330 at motor

205 stock
pully change 30 hp 235
header change 20 hp 255
exhaust cat back 10 hp 265
cold air intake 8 hp 273
nx 50 shot 320 hp let say
ecm lets say 10 hp

on slicks that should be 12s easy.

stock cobalt with header, full exhaust and pully change and 75 shot i think will be close to 330 at motor

205 stock
pully change 30 hp 235
header change 20 hp 255
exhaust cat back 10 hp 265
cold air intake 8 hp 273
nx 50 shot 320 hp let say
ecm lets say 10 hp

on slicks that should be 12s easy.


You have to keep in mind that adding one part after another does not always give you additional hp. Through the history of the Cav we all saw minor increases with the header, cat back, and the CAI. In other words, CAI at 8 hp, header at 20 hp, and cat back at 10 hp will not equal 38 hp, it will be closer to 22-24 hp at best.

stock cobalt with header, full exhaust and pully change and 75 shot i think will be close to 330 at motor

205 stock
pully change 30 hp 235
header change 20 hp 255
exhaust cat back 10 hp 265
cold air intake 8 hp 273
nx 50 shot 320 hp let say
ecm lets say 10 hp

on slicks that should be 12s easy.

that is nothing more than ricer math, you have to figure that each part plays on the other, so an intake will make the header make more power, or vise versa, but you can't add up what each does on a stock engine. although a car with a full exhaust will likely see more power from just the pulley swap than a stock motor.

i'm still convinced that doing a pulley swap isn't a good idea until you've done full I/H/E, not to mention that cooling and fuel issues will need to be addressed. also, you have to consider that the PCM is setup to allow a certain amount of boost. freeing up the exhaust track will lower boost, so it's likely that after I/H/E we could safely swap pullies, as long as fuel can be compensated

u guys keep saying that u will get a 30-40 hp gain from 4 psi. im not so sure about that.LSJ's are dynoing llike 210whp, standard ecos dyno at about 130whp. so thats a 80 hp gain from 12 psi. i doubt 4 psi will give 30-40 UNLESS there is proper tuning software to back it up.

u guys keep saying that u will get a 30-40 hp gain from 4 psi. im not so sure about that.LSJ's are dynoing llike 210whp, standard ecos dyno at about 130whp. so thats a 80 hp gain from 12 psi. i doubt 4 psi will give 30-40 UNLESS there is proper tuning software to back it up.

Obviously the stock Eco is a 2.2L as opposed to the 2.0L displacement of the LSJ. You also have to consider that the LSJ was designed from the get-go as an F/I application, and thus has different compression ratios, cams, timing, fueling etc. then the stock Eco, so you can't really compare the 12PSI to an 80hp gain.

Either way, I agree that you will need an ECU reflash in order to get the most out of the extra boost provided by a pulley swap.

i understnad what u r saying. it was kind of a crude comparison but u see what i was getting at. his engine definatley has potential but some of the power gain estimates ive seen are kinda of the wall (not specifiacally talking about u guys^^^). im planning on swapping an lsj into my 03 cav so im just as excited about the aftermarket as u guys are :-D

I have an 03 cobra, with an Eaton M112, with a pulley change. There are only two reasons why I think a pulley change might not work on the cobalt. The first is this boost bypass, which stops the car from getting over 12psi, if I understand that correctly. If I'm wrong, or it can be removed, that should be nothing to worry about. The second is the maximum efficiency of the blower. On my 03 cobra, it comes with 8psi, and around 15 psi, the blower stops making more power. After 15psi, it will only increase the torque when you add boost, not hp. So as long as the cobalt s/c isn't at its maximum efficiency at 12psi, you will make more power by putting on a smaller pulley.

Putting on a pulley will hurt your car, if you do not get it tuned. On a cobra that is a surefire way to blow up your engine. If you do get it tuned, its completely safe. You will make more heat, but as long as your tuned, it will make more power/torque.

I have an 03 cobra, with an Eaton M112, with a pulley change. There are only two reasons why I think a pulley change might not work on the cobalt. The first is this boost bypass, which stops the car from getting over 12psi, if I understand that correctly. If I'm wrong, or it can be removed, that should be nothing to worry about. The second is the maximum efficiency of the blower. On my 03 cobra, it comes with 8psi, and around 15 psi, the blower stops making more power. After 15psi, it will only increase the torque when you add boost, not hp. So as long as the cobalt s/c isn't at its maximum efficiency at 12psi, you will make more power by putting on a smaller pulley.

Putting on a pulley will hurt your car, if you do not get it tuned. On a cobra that is a surefire way to blow up your engine. If you do get it tuned, its completely safe. You will make more heat, but as long as your tuned, it will make more power/torque.

i wouldn't mind more torque, we'll have plenty of power to be tapped for a FWD car with a smaller pulley, freeing up the exhaust and intake, and solutions are already being worked on for fuel/timing

In my car club here in Toronto there are ton's of guys with GTP's. Almost all of them have put on smaller pulley's and noticed significant gains at the 1/4 mile track. We have GTP's well into the 12's now (with other mods as well).

HP or Torque, the pulley will increase performance. People with after market S/C that put on smaller pulley's sometimes don't see significant gains in performance because there blower is already maxed out. The Cobalt SS blower is not maxed out....nothing GM does is ever maxed out. Hell, they are even cutting the rev's early in the car even though the engine is still making power.

I talked to the GM guy at the Detroit autoshow and he said.

"We desinged the Cobalt SS with an oversized intercooler because we know one of the first modifications people will do to this car is install a small supercharger pulley"

So although this post may not contain the right pulley, a pulley will work and heat will not be an issue. Once I find a specifically designed pulley for our cars I will buy it and install it along with a catback and CAI at the same time.

"We desinged the Cobalt SS with an oversized intercooler because we know one of the first modifications people will do to this car is install a small supercharger pulley"

Sweet. I hope that is the case, the Laminova intercooler certainly has a strong rep. I'd imagine if these "staged performance uprgrades" from GM we've been hearing about ever come out a smaller pulley will be one of the main mods.

Just wondering??

Just wondering?? Cold Air Intake.

that is nothing more than ricer math, you have to figure that each part plays on the other, so an intake will make the header make more power, or vise versa, but you can't add up what each does on a stock engine. although a car with a full exhaust will likely see more power from just the pulley swap than a stock motor.

i'm still convinced that doing a pulley swap isn't a good idea until you've done full I/H/E, not to mention that cooling and fuel issues will need to be addressed. also, you have to consider that the PCM is setup to allow a certain amount of boost. freeing up the exhaust track will lower boost, so it's likely that after I/H/E we could safely swap pullies, as long as fuel can be compensated If you get the engine to flow more air you won't need more boast. More pressure (boost) doesn't necessarily mean your getting more air into the combustion chamber.

If you get the engine to flow more air you won't need more boast. More pressure (boost) doesn't necessarily mean your getting more air into the combustion chamber.

i'm failing to see the point of your post

unless i'm incredibly mistaken, a supercharger compresses the air entering the engine, ALLOWING THE ENGINE TO DRAW MORE AIR INTO THE CYLINDER. this allows more fuel to be added creating a bigger bang in the cylinder.

ive always felt that its better to get the most out of what boost you are using. i also agree with vita that it really is a bad idea to try to increase boost right off the bat. its best to open the system up more and then increase boost. with the system flowing the exhaust out better, you will see higher net gains with a boost increase because the system is not bottle-necking and the engine is operating more efficiently. only bad thing about this on the cobalt, is that we arent really able to do this at this time. which is why i cant wait till someone releases a fully tuneable ECU like Hondata's K-pro...so yeah, whoever is reading this, GET ON IT!!

I have an 03 cobra, with an Eaton M112, with a pulley change. There are only two reasons why I think a pulley change might not work on the cobalt. The first is this boost bypass, which stops the car from getting over 12psi, if I understand that correctly. If I'm wrong, or it can be removed, that should be nothing to worry about. The second is the maximum efficiency of the blower. On my 03 cobra, it comes with 8psi, and around 15 psi, the blower stops making more power. After 15psi, it will only increase the torque when you add boost, not hp. So as long as the cobalt s/c isn't at its maximum efficiency at 12psi, you will make more power by putting on a smaller pulley.

Putting on a pulley will hurt your car, if you do not get it tuned. On a cobra that is a surefire way to blow up your engine. If you do get it tuned, its completely safe. You will make more heat, but as long as your tuned, it will make more power/torque.

what exactly is all involved in tuning the car?

air fuel mixture ratio (making sure the car isn't running to lean)
ignition timing (although most cars today have this pretty much covered)
making sure the engine isnt knocking (detination)

the smoother the HP curve, and the flatter the torque curve, the better...

i'm failing to see the point of your post
I am agreeing with you that doing the intake/header/exhaust upgrades would be the best place to start with increaing power. Since if the engine has a better ability to breath it will better utilize more boost from any pulley/blower upgrades you do later.

Cold Air Intake.

Thanks for clearing that up..!! duh I should of figured that out.. I guess I haven't been thinking! :nuts:

I am agreeing with you that doing the intake/header/exhaust upgrades would be the best place to start with increaing power. Since if the engine has a better ability to breath it will better utilize more boost from any pulley/blower upgrades you do later.

You just described my entire mod plans in order :lol: I am getting a CAI, and exhaust together (downpipe back). Then probably a head and pulley far later in the year once I see some more products on the market and tests done with them. (I don't want to be the first person on CobaltSS.net with a post reading "So I blew up My Engine Today")

Hey guys, i'm new to the forum, but i've been reading up a lot on what's going on.

I've driven both the coupe and the sedan, when they were preproduction models and i loved em both. the coupe is the BEST! i'm waiting to get my hands on one of the early ss supercharged models :)

have you guys read about the quick mod that you can do w/ the supercharger? where you pull off and plug the vacume hose that goes into the supercharger. It ended up giving a lot of people peak boost of about 14.5 psi!! imagine if you did that with a smaller pulley?!?! yeah i know the heat problem is an issue... but just imagine the possibilities!

Welcome to the site. yeah I think there will be alot of things we can do to the engine. As for the heat issue, I think we will see some sort of aftermarket cooling system that will do the same thing the vacum hose does but also provides cooling

Hey guys, i'm new to the forum, but i've been reading up a lot on what's going on.

I've driven both the coupe and the sedan, when they were preproduction models and i loved em both. the coupe is the BEST! i'm waiting to get my hands on one of the early ss supercharged models :)

have you guys read about the quick mod that you can do w/ the supercharger? where you pull off and plug the vacume hose that goes into the supercharger. It ended up giving a lot of people peak boost of about 14.5 psi!! imagine if you did that with a smaller pulley?!?! yeah i know the heat problem is an issue... but just imagine the possibilities!

it spiked at ~13psi for most

no real power increase on a dyno has been confirmed yet

it spiked at ~13psi for most

no real power increase on a dyno has been confirmed yet
Well we just have to wait for our cars to see how much they can "take". Hopefull we wont be seeing too many shops blowing motors.

Well we just have to wait for our cars to see how much they can "take". Hopefull we wont be seeing too many shops blowing motors.

PSI-FI is on the frontline, with SMS as well, (they're going to focus on Redline performance packages)

i can't wait to hear about something blowing up, either that or the motor holding 300-400whp without anything going out....

fuel is the main concern as far as i know (injectors too small)

Wow there is a lot of dumb people on this site.
If you put a smaller pulley on the blower you will make more power. When you increase the amount of air going into an engine you can now burn more fuel and that makes power..

Thats why bigger engines make more power, and engines that rev higher. The more fuel you can drop into the engine the more power.

One thing you must remember, this car has a roots blower and roots blowers make a lot more heat then a centrifugal blower or a turbo. So you’re going to make less HP per psi because of the increased heat.

And the guy with the 03 cobra lied when he said adding more then 15 PSI on the cobra doesn’t make more HP only torque. Well I would believe this if the laws of physics didn’t exist under the hood of a cobra,
Hp = ( Torque * RPM ) / 5252 so if torque increases so does HP.

I think a good mod for the future, would be to install a twin screw blower on the cobalt. Keep an eye on Kenne Bell because they make these blowers. The twin screw works a lot like the roots blower making full boost instantly but makes less heat therefore making more HP per psi.
Im not a fan of centrifugal blowers, but im sure someone will figure out how to install one also..

But the turbo is the way to go if you can, it doesnt rob power from the engine to make boost, and doesnt create as much heat as other blowers..

Go ahead and put a pulley on the car, but make sure you get a dyno tune. You also want to make sure your injectors are big enough to support the fuel you will need, the last thing you want to do is go lean. Even with a built motor, if you go lean say bye bye to the engine..

Dumb people on this site, eh? As best I can tell, you have approximately two facts that you heard from someone (that aren't even totally correct to begin with), and based on that, you think you're some sort of expert.

Hang on while I explain.

If you put a smaller pulley on the blower you will make more power. When you increase the amount of air going into an engine you can now burn more fuel and that makes power..
No. There's no guarantee that a smaller pulley will increase airflow. Go learn about blower efficiencies. Also remember that BOOST is pressure, a measure of RESTRICTION. More boost means more air that the blower can't push into the combustion chamber. 20lbs on a stock LSJ is not a good thing, it means your head can't breathe for shit, and you're just going to end up melting something.

When you increase the amount of air going into an engine you can now burn more fuel and that makes power. Thats why bigger engines make more power, and engines that rev higher. The more fuel you can drop into the engine the more power.
This is what I mean about you apparently hearing this fact somwhere, and assuming that you've become an expert. In principle, this is correct. In practice, a combustion engine is not as simple as your Lego.

And the guy with the 03 cobra lied when he said adding more then 15 PSI on the cobra doesn’t make more HP only torque. Well I would believe this if the laws of physics didn’t exist under the hood of a cobra,
Hp = ( Torque * RPM ) / 5252 so if torque increases so does HP.
No. Again, you've no doubt read this equation somewhere and proclaimed yourself an expert. At a point, the amount of air the blower can push will plateau. Spinning it faster will result in no extra airflow, just excess heat. A smaller pulley can allow it to flow more at low RPMs, but won't make any more flow at high RPMs. Thus you increase low RPM torque, but not high RPM torque, resulting in the same *max* horsepower (more mid-band horsepower).

I think a good mod for the future, would be to install a twin screw blower on the cobalt. Keep an eye on Kenne Bell because they make these blowers. The twin screw works a lot like the roots blower making full boost instantly but makes less heat therefore making more HP per psi.
Im not a fan of centrifugal blowers, but im sure someone will figure out how to install one also..
No doubt this is all based on your vast knowledge of, and experience with blowers....

You really have no basis upon which to call others dumb unless you're a genius yourself. As best I can see, you're not.

Next time, make sure you know what you're talking about before you go calling other people dumb.

Wow there is a lot of dumb people on this site.



There is no need for this kind of talk. Our goal is to provide a friendly atmosphere for all. Please read the site rules because this will not be tolerated here. If you feel the need to call someone names, email them, but don't degrade the site with those kind of posts.

Thanks

I believe that the GM factory Eco Cavy made 350 HP with 2 psi of boost. It's all about CFM and that engine had it :)

I used to think it was boost you wanted over all but after a lot of reading and research and posts on board like this I realize there are quite a few factors that go into boost.

I dont really think there would be a problem with over-heating.
Its spring and it just snowed by me last week. lol

unless you live in navada or something you should have nothing to worry about.

Id prob set my boost around 15-16psi just to be on the safe side. If ur not gonna be going mad with it but still gonna have some fun kickin some srt @$$ then thats prob the best setting without hurting the engine. Just thinking of long-term. I plan on having my cobalt for a long time. I dont want something going wrong because of some mod. I think everyone can agree with that one. lol unless ur some rich @$$.. lol then feel free to experiment and let me know what happens.

Jonel, yes we have our DUB Interchangeable Supercharger Pulley Unit for the
new Cobalt units, from sizes 3.4" down to 2.60" . Hope this helps, as you
will need to remove the 4 bolts securing the supercharger to remove the
stock pulley and install our new unit. This is about an hour job to make
this change. Hope this helps.

Check out the new Cobalt SS pulley section here:

http://www.southfloridapulleyhq.com/SFPH/rl_csss/ps_dub_system.htm

http://www.southfloridapulleyhq.com/SFPH/rl_csss/vehicle_logo_rl_csss.jpg

Thanx for all the info and work sfph.

Are you guys just making the pulleys or are you also mod'ing the LSJ cars?

I would be interested in something like this as soon as exhaust/intake systems come up to speed. It seems like thats the first places to start.

Have you actually put a pulley on a SS/SC yet?

um I think thats all for now.

what sux is even with their 1 lb boost pulley it requires 93 octain. so that kinda ruuins it for some people that have no access to 93 octain. my only access is 91 then next is 100 octain. maybe mix a bit of the two, who knows.

Thanx for all the info and work sfph.

Are you guys just making the pulleys or are you also mod'ing the LSJ cars?

I would be interested in something like this as soon as exhaust/intake systems come up to speed. It seems like thats the first places to start.

Have you actually put a pulley on a SS/SC yet?

um I think thats all for now.zinner, yes, we are making the smaller supercharger pulleys for the Cobalt SS and the Ion Redline at this time. We are still in the test stages with a couple of our customers who are installing these pulleys and going to be getting back to us on their results. We recommend using 93 octane with these pulleys, but we also realize in California, Arizona that can only use 91 octane.

But by also regapping the sparkplugs down .005, does lower cylinder temperatures somewhat at wide open throttle. We have not yet ourselves installed one of our own supercharger pulleys onto a Cobalt SS or Ion Redline, as have been told it is not that complicated. We will be offering Installation Instructions with every kit we sell in the future.

We will also be offering the new K&N FIPK Intake system the end of this month, as they are on backorder right now for these new vehicles. Hope this helps, as we will post more information as we recieve it from the couple different speed shops we support.

Yah i really want to know if creates more heat or not...because if it doenst it will probly be the first mod i do but if it does ill probly do a CAI or exhaust

We will also be offering the new K&N FIPK Intake system the end of this month, as they are on backorder right now for these new vehicles. Hope this helps, as we will post more information as we recieve it from the couple different speed shops we support.

Nice K&N will be offering a SS/SC specific intake system? I checked out the redline and it's air intake system is routed my differently than that SS/SC. Just want to be sure you mean the SS/SC.

I recently pulled apart the fender well to check out exactly how the air intake it routed/setup. You can check it out at the link below.

http://www.cobaltss.org/gallery/aircleaner

If you need someone to help test out the K&N system for the Cobalt SS/SC send me a PM. I can give it a shot and take lots of pictures during the install. Pictures definetly sell a product for me.

We will also be offering the new K&N FIPK Intake system the end of this month, as they are on backorder right now for these new vehicles. Hope this helps, as we will post more information as we recieve it from the couple different speed shops we support.


Yah I'll be willing to test the product as well


zinner...what is a PM?????

Yah I'll be willing to test the product as well


zinner...what is a PM?????

PM = Private Message

:cssNET:

thats cool that u guys are looking into it. and good that u realize that california doesnt have regular access to 93 octain :(, i'm sure a msd ignition setup will help with not needing the 93 octain and be able to use 91. definatly keep us informed. looking real good thus far.

I don't think the issue is engine overheating..its the s/c overheating and frying...I mean at 12psi's were making 205 (let's just say that) at 16-18 psi's we'll be making at least 240 and then bolt ons on top of that :)....BUT only thing we can do is just to wait and see :)

There is something seriously wrong with the way you guys are going about choosing pulleys. I stumbled upon your website via clubgp.com when someone posted a link here about someone's SS dyno and how he was making 205 at the wheels. I must say very impressive.

HOWEVER, this thread lacks something which I find really frightening. No one has mentioned a scanner. Anytime you mess with boost, you MUST scan it to make sure your car is healthy and runs good. Saying that you "should" be good with I/H/E and a smaller pulley is not satisfactory. There have been more than one instance in the GP community of people with I/E and Tstat that still get a lot of KR. Although I understand that you have an IC from the factory and it is oversided and all, Knock should still be the number one priority.

I would really expect more from a vendor than what has been displayed. The vendor's responsibility is to warn people about the possible dangers of going overboard in modding, especially without the proper support. Saying you can just slap on a smaller pulley without even doing some research on the effects of smaller pulleys on the specific car is very dangerous. Now you might just be fine with going with a smaller pulley completly stock, but who has done the research? How has taken a sampling from more than one car on the effects of a smaller pulley. Has anyone ACTUALLY put on a smaller pulley?

Take my post for what you want, but seeing this made me very disturbed. I would really hate to see lots of broken SS/RLs because of not monitoring their car carefully enough. Like I said, you may be just fine, but until someone does the research, I would be very cautious.


cliffnotes: i think you need a scanner because engine could go BOOM

There is something seriously wrong with the way you guys are going about choosing pulleys. I stumbled upon your website via clubgp.com when someone posted a link here about someone's SS dyno and how he was making 205 at the wheels. I must say very impressive.

HOWEVER, this thread lacks something which I find really frightening. No one has mentioned a scanner. Anytime you mess with boost, you MUST scan it to make sure your car is healthy and runs good. Saying that you "should" be good with I/H/E and a smaller pulley is not satisfactory. There have been more than one instance in the GP community of people with I/E and Tstat that still get a lot of KR. Although I understand that you have an IC from the factory and it is oversided and all, Knock should still be the number one priority.

I would really expect more from a vendor than what has been displayed. The vendor's responsibility is to warn people about the possible dangers of going overboard in modding, especially without the proper support. Saying you can just slap on a smaller pulley without even doing some research on the effects of smaller pulleys on the specific car is very dangerous. Now you might just be fine with going with a smaller pulley completly stock, but who has done the research? How has taken a sampling from more than one car on the effects of a smaller pulley. Has anyone ACTUALLY put on a smaller pulley?

Take my post for what you want, but seeing this made me very disturbed. I would really hate to see lots of broken SS/RLs because of not monitoring their car carefully enough. Like I said, you may be just fine, but until someone does the research, I would be very cautious.


cliffnotes: i think you need a scanner because engine could go BOOM

Well I agree. There have been a couple posts about this. One is actually started by me.

http://www.cobaltss.net/forums/showthread.php?t=2165

huh, cant believe i missed that thread. Also, another good scanner to look at is the LS1m (www.ls1m.com). It uses a palm pilot to record and is around $300-$350 including the palm pilot. Less if you already have one.

huh, cant believe i missed that thread. Also, another good scanner to look at is the LS1m (www.ls1m.com). It uses a palm pilot to record and is around $300-$350 including the palm pilot. Less if you already have one.

I checked that out too but since it seemed v8 orientented I figure it wasn't any better than autotap. I was thinking about the USB version since I have a laptop already.

Ls1m is not just for v8s. It is also very popular with the DSM crowd. There are also quite a few in the GP community with it as well. It is for ANY OBD-II equipped car.

If you have a laptop, you may want to check out the alex pepper scan tool. The basic setup is $125 or so. The website is kinda confusing, but if you sort through it, you should find what you need. HTH

:-D Scanning is the KEY..

This pulley mod is not a good thing unless a few things happen. A/F ratio goes lean with just a boost bypass mod, on the Saturn Redline. So we need more fuel or Possible a ECU upgrade to dump more fuel. People have tried the Boost bypass mod with alot of different results. Most noticed no improvement. Some where running rich after they tried it. So if they are going to come out with something like this. They need to do it right. Cover all of the problem then install as a system.

I asked about a scanner when I first found this site also...
http://www.cobaltss.net/forums/showthread.php?t=2055

The info I got from that thread is that the Cobalt uses a different protocol - CAN...so it looks like the LS1M is out as well as any other scan tool that doesn't support CAN. Also I own an LS1M and as far as I know it is only programed for the LS1 (5.7 litre) and L67 (3800SC)...although people have connected it to other cars (the post above mentions the Redline) and have got certain parameters to display I would have to wonder about the accuracy of the info.

I believe it was Zinner who posted a few other scanner options that offer the CAN protocol support, also in the above post.

Scanner options are out there, but I haven't heard of anyone trying it yet. The one from Autoenginuity looks promising.

I asked about a scanner when I first found this site also...
http://www.cobaltss.net/forums/showthread.php?t=2055

The info I got from that thread is that the Cobalt uses a different protocol - CAN...so it looks like the LS1M is out as well as any other scan tool that doesn't support CAN. Also I own an LS1M and as far as I know it is only programed for the LS1 (5.7 litre) and L67 (3800SC)...although people have connected it to other cars (the post above mentions the Redline) and have got certain parameters to display I would have to wonder about the accuracy of the info.

I believe it was Zinner who posted a few other scanner options that offer the CAN protocol support, also in the above post.

Scanner options are out there, but I haven't heard of anyone trying it yet. The one from Autoenginuity looks promising.
Look later in the thread. Turns out a CAN-capable device is not needed to access engine parameters. A J1850 device (like LS1M) will work. (as long as it can be configured to access the correct PIDs)

I asked about a scanner when I first found this site also...
http://www.cobaltss.net/forums/showthread.php?t=2055

The info I got from that thread is that the Cobalt uses a different protocol - CAN...so it looks like the LS1M is out as well as any other scan tool that doesn't support CAN. Also I own an LS1M and as far as I know it is only programed for the LS1 (5.7 litre) and L67 (3800SC)...although people have connected it to other cars (the post above mentions the Redline) and have got certain parameters to display I would have to wonder about the accuracy of the info.

I believe it was Zinner who posted a few other scanner options that offer the CAN protocol support, also in the above post.

Scanner options are out there, but I haven't heard of anyone trying it yet. The one from Autoenginuity looks promising.


why dont you hook up the LS1m to your cobalt and see what all it reads?

Thanks DanM...that's the 2nd time you straightened me out. Missed that post by you in the other thread.

Stuffy236...I would gladly hook my LS1M to my Cobalt SS - but I don't have one yet.

Thanks DanM...that's the 2nd time you straightened me out. Missed that post by you in the other thread.

Stuffy236...I would gladly hook my LS1M to my Cobalt SS - but I don't have one yet.

that may just be a small problem then huh ;)

So has anyone (an individual or a parts company) tried a smaller pulley on their Cobalt SS or even on an Ion RL yet? I would like to hear about some real world results. I plan on leasing a Cobalt SS very soon, and I want to know how much more boost the supercharger and engine can handle without having to make any supporting mods. I want to keep it simple and cheap since this car is going to be leased for only 3 years. I am assuming that 2 or 3 extra psi would be a safe and effective way to add 20 or 30 hp, but I would really like to know for sure before I try it. I hope someone around here has the balls to try it first! From the dyno info I have seen on this forum, it appears that the SS can produce at least 240 hp at the crank with only a drop in K&N filter. If I could get just an extra 20 hp from a pulley, that would put me at 260 hp and I would be very happy with that! :-D

A smaller pulley will create more power as long as you have a healthy air/fuel ratio. The ecotec motor should be able to handle at least 18lbs of boost but you may need to upgrade your fuel system. My only concern is that the M62 is a small blower. The M62 can produce more than 12lbs but it just isn't big enough or efficient enough to produce 18+lbs. So you will need to upgrade your supercharger or put a turbocharger on if you want huge gains. So it will be interesting to see if they offer larger supercharger or turbo charger upgrades in the future. Oh and the bypass valve only opens when your not using the supercharger (partial throttle) and when you approach redline the Eatons bypass valve releases a few pounds to protect against detonation. But to say that the pulley won't add boost because of the bypass valve is nonsense.

A smaller pulley will create more power as long as you have a healthy air/fuel ratio. The ecotec motor should be able to handle at least 18lbs of boost but you may need to upgrade your fuel system. My only concern is that the M62 is a small blower. The M62 can produce more than 12lbs but it just isn't big enough or efficient enough to produce 18+lbs. So you will need to upgrade your supercharger or put a turbocharger on if you want huge gains. So it will be interesting to see if they offer larger supercharger or turbo charger upgrades in the future. Oh and the bypass valve only opens when your not using the supercharger (partial throttle) and when you approach redline the Eatons bypass valve releases a few pounds to protect against detonation. But to say that the pulley won't add boost because of the bypass valve is nonsense.

The S/C on the SS is a M90 not a M62....

A smaller pulley will create more power as long as you have a healthy air/fuel ratio. The ecotec motor should be able to handle at least 18lbs of boost but you may need to upgrade your fuel system. My only concern is that the M62 is a small blower. The M62 can produce more than 12lbs but it just isn't big enough or efficient enough to produce 18+lbs. So you will need to upgrade your supercharger or put a turbocharger on if you want huge gains. So it will be interesting to see if they offer larger supercharger or turbo charger upgrades in the future. Oh and the bypass valve only opens when your not using the supercharger (partial throttle) and when you approach redline the Eatons bypass valve releases a few pounds to protect against detonation. But to say that the pulley won't add boost because of the bypass valve is nonsense.

If you look at the eaton site the M62 is designed for 2.5 to 4.0 litre engines. Since the LSJ is 2.0 doesn't it stand to reason that the M62 is at least a tad bit oversized ?

I don't think people would be making pulley to take the blower up to 18psi if it couldn't handle it?

I guess we know until we try :) I hope that with a new pulley and upgrade in fuel system and we will be looking at some even better number for the LSJ.

The S/C on the SS is a M90 not a M62....


ummm you have that backwards. The m90 is on the grand prix GTP

The S/C on the SS is a M90 not a M62....

looks like you're quite sure about that...

The stock 2.0L LSJ supercharger is 84mm in diameter.....I have switched a customers car to a smaller 77.9mm pulley, and Corsa cat back exhaust(modified GrandAm cup exhaust) and got 27hp at the wheels. no change to tuning, air filter, intake or any other systems. with the exception of a RonDavis rad.

The stock 2.0L LSJ supercharger is 84mm in diameter.....I have switched a customers car to a smaller 77.9mm pulley, and Corsa cat back exhaust(modified GrandAm cup exhaust) and got 27hp at the wheels. no change to tuning, air filter, intake or any other systems. with the exception of a RonDavis rad.


Very interesting. I have lots of questions so I'm going to list them below and I'd appreciate it if you'd try to answer them.

- You say there was a 27whp increase, so what was the whp before and after?
- How much of that increase do you think was due to the pulley?
- Do you know what the new max boost is?
- Was this LSJ in a Cobalt or an Ion?
- How long has the customer had this setup? Any heat issues or anything like that?
- Do you know what the air/fuel ratio was before and after the change?
- Do you think going with an even smaller pulley (say 75 mm or so) would be too much?

Thanks for the info!

Very interesting. I have lots of questions so I'm going to list them below and I'd appreciate it if you'd try to answer them.

- You say there was a 27whp increase, so what was the whp before and after?
- How much of that increase do you think was due to the pulley?
- Do you know what the new max boost is?
- Was this LSJ in a Cobalt or an Ion?
- How long has the customer had this setup? Any heat issues or anything like that?
- Do you know what the air/fuel ratio was before and after the change?
- Do you think going with an even smaller pulley (say 75 mm or so) would be too much?

Thanks for the info!

1-197before.....224after
2-hard to say exactly since the exhaust mod is integral to the potential of the pulley but I'd say 60% of the gain....ive seen around 11hp with just the exhaust and a less restrictive intake, but I dont have numbers for each step of the process..
3-the usable boost is still only around 10-13psi...but it comes on sooner.
4-Cobalt
5-its been on the road now for about 500miles....hes still taking it easy...there havent been any issues yet but I would recommend a modified aftercooler radiator If you intend to go with a smaller pulley than this or if you want to make full use of available power via pcm tuning.
6-its stock tuning so before and after its pretty fat...around 12.7(i dont have the numbers in front of me)at WOT...aftermarket tuning IS needed to take full advantage of this mod...235-250hp @ crank is IMO absolute max for stoxk tuning.
7-Again...after this level I really think you need to go with aftermarket tuning, and upgraded aftercooling. Unfortunate;y GM has stepped up with programs yet like Mopar has...in time...other wise to go for more power you are going to have to seriously compromise your warranty coverage...IE aftermarket engine control

Thanks again Maven. One last question: South Florida Pulley lists the stock pulley as 3.5 inches. You say the stock pulley is 84mm which is roughly equal to 3.3 inches. Who is right? Also, where did you get your pulley?

GM has done some upgrades with the pulleys. if you like you could look at the GM permance build book available at gmtuner it's on page 140, everything they did to compete in the GS and ST competitions ther car went from 205 to 235HP, 84mm to a 77.9mm pulley

Maven, Can you help me get one of those Corsa catbacks?

I'm very very interested!!!

Remember if you add air you need to add fuel period!!!! If not you will ruin the cat like i did. I finally spent the denero and purchased the stage 3 kit.

wow this is an old thread.....

wow this is a year+ post haha