around 7 tonight i took my cobalt out for some runs since it was 22 degreess. i hit I 65 and did about 5 3rd gear pulls.. each time my car pinged 14.5 psi nearly 15. i never felt so much power. mods i have are./. cx heat exhanger (front mount),air box mod. hks muffler dragger muffler. i highly recommend this muffler my car sounds amazing. deep..non raspy...very loud. but why would i hit so much boost?? im usually around 11-12 isnt 10 factory??? if so 5 psi above factory is pretty sweet.

its because ur so cool.

factory is 12.5. it hit so high because its cold out. wonderful thing huh? nothing to worry about though.

around 7 tonight i took my cobalt out for some runs since it was 22 degreess. i hit I 65 and did about 5 3rd gear pulls.. each time my car pinged 14.5 psi nearly 15. i never felt so much power. mods i have are./. cx heat exhanger (front mount),air box mod. hks muffler dragger muffler. i highly recommend this muffler my car sounds amazing. deep..non raspy...very loud. but why would i hit so much boost?? im usually around 11-12 isnt 10 factory??? if so 5 psi above factory is pretty sweet.

its because ur so cool.

Its because of the cold air......when it gets warm out...you'll be back to 12.5psi. But it is nice isnt it. :)

lol cold air will give you at most 1 more psi when going from like 80F to 20F. Id say either your boost guage isnt reading properly or your cat is on its way out.

i dont see how it being colder would create higher psi. more power...yes, but atmospheric would still be 14.7psia

im gonna guess ur cat is clogging up

yeah 12.5psi is stock. but its just cause its cold out. same thing is happening to me. its about 30* and i'm hitting 13.5ishpsi

i dont see how it being colder would create higher psi. more power...yes, but atmospheric would still be 14.7psia

im gonna guess ur cat is clogging up

no the PSI will increase because the colder air is denser, meaning you can compress more air molecules per revolution of the supercharger, but once they get compressed they heat up and expand, increasing the PSI. But by no means should he see 5 extra PSI.

i dont know why, but your car DOES in fact make more boost when its colder. and wayy more of an increase than 1 psi if you went from 80 to 20 degrees out. when i was stock i had the same jump. when it was 90 out i may hit just over 11 psi at like 70 i hit the full 12.5 and around 50 degrees i would see like 13.5

i dont know why, but your car DOES in fact make more boost when its colder. and wayy more of an increase than 1 psi if you went from 80 to 20 degrees out. when i was stock i had the same jump. when it was 90 out i may hit just over 11 psi at like 70 i hit the full 12.5 and around 50 degrees i would see like 13.5


unless this is tested with a computer, that stock innacurate guage does not count. And this is such a typical css.net response. He has no idea what hes talking about, but hes damn sure of it. And yes there is something to worry about, his car isnt properly tuned for a higher PSI. Theres a reason that any good tuner will have a summer tune and a winter tune, and its for this very reason. Your car runs alot leaner in the cold weather.

You guys all need smaller pullies. Worrying about who makes the most boost on a stock pulley is like fighting a retarded kid. Even if you win, you still suck.

a stock SS/SC with a stock tune should bypass anything over 12.5 psi right?

unless this is tested with a computer, that stock innacurate guage does not count. And this is such a typical css.net response. He has no idea what hes talking about, but hes damn sure of it. And yes there is something to worry about, his car isnt properly tuned for a higher PSI. Theres a reason that any good tuner will have a summer tune and a winter tune, and its for this very reason. Your car runs alot leaner in the cold weather.

Any good tuner knows not to have a setup that only runs in certain weather ranges. Fueling and airflow tables should be correct no matter what temperature or air pressure. ECM's have been designed to operate under variable conditions for years. If you have lean issues in cold weather you're doing something wrong. We range from 35 degrees celcius in the summer to -40 degrees celcius here in the winter and my fueling is rock solid on any day of the year. Only issues were coming to close to maxxing 42# injectors when it was that cold for my comfort.

a stock SS/SC with a stock tune should bypass anything over 12.5 psi right?

Correct, but heat soak and stuff like that still allows a little more than 12.5, it also depends on the specific car. Some are really sensitive, others aren't.

You guys all need smaller pullies. Worrying about who makes the most boost on a stock pulley is like fighting a retarded kid. Even if you win, you still suck.

They're missing out on all the fun!

BTW, pulls like a beast on spray.

GUYS... stop doing these long highway pulls in the cold! How many times do I have to say it?



Meh, not my car to blow up anyway. :)

GUYS... stop doing these long highway pulls in the cold! How many times do I have to say it?



Meh, not my car to blow up anyway. :)

My car loves highway pulls.:)

My car loves highway pulls.:)

Even when it's 17 degrees outside?

Any good tuner knows not to have a setup that only runs in certain weather ranges. Fueling and airflow tables should be correct no matter what temperature or air pressure. ECM's have been designed to operate under variable conditions for years. If you have lean issues in cold weather you're doing something wrong. We range from 35 degrees celcius in the summer to -40 degrees celcius here in the winter and my fueling is rock solid on any day of the year. Only issues were coming to close to maxxing 42# injectors when it was that cold for my comfort.

That all depends on the capability of the ECU to react. The factory tune is incredibly rich, to allow for the cold weather, it won't lean out enough to bother anything, just run better. Down here in the 100 Degree weather, we get 10:0 A/F on stock and stage tunes. Cooler weather brings them much more in line, but it also allows more timing due to IAT adder tables and such.

On many setups, the amount you can compensate for weather changes is minimal, and an optimum power tune in the summer will be dangerous in the winter, and a winter tune will lose power in warmer weather.

They're missing out on all the fun!

BTW, pulls like a beast on spray.

Glad to hear that. Its fun, isn't it :)

Glad to hear that. Its fun, isn't it :)

I know :)

I never sprayed it before it blew originally, so I didn't know the full potential.

12.5 stock, u'll get maybe 1 with the cold but thats it..somethings up ur not gonna get another 2.5 just from the cold :lol:

no the PSI will increase because the colder air is denser, meaning you can compress more air molecules per revolution of the supercharger, but once they get compressed they heat up and expand, increasing the PSI. But by no means should he see 5 extra PSI.

i see what your saying. but if the IAT1 charge is cooler, then the IAT2 charge will also be cooler. i figured it would be proportionately cooler so that the pressure is still 12psi

my car made 14.1 psi on the stock pulley on my old setup.

Even when it's 17 degrees outside?

My car is beastly in this cold....I wish it ran like this during the summer.:) When I had my car dyno'd in early-mid oct. it was 40 out and my A/F was 10:0......stock, talk about pig rich. Its nice, the cold has leaned it out just enough, nothing but great power now.

my car made 14.1 psi on the stock pulley on my old setup.

Were you tuned or have the stock limiter . A stock pulley will show more psi when spun to 7K or 7200 rpm right?

Were you tuned or have the stock limiter . A stock pulley will show more psi when spun to 7K or 7200 rpm right?

it shouldnt really. the blower spinning faster will create more airflow, but the engine revving faster will also use more air faster...so psi should be the same. this is why you dont have 2x as much boost at 6krpm as you do at 3krpm, even tho the blowers spinning 2x as fast

Were you tuned or have the stock limiter . A stock pulley will show more psi when spun to 7K or 7200 rpm right?

I was tuned and spinning to 7500, still spinning to 7500 now.

That all depends on the capability of the ECU to react. The factory tune is incredibly rich, to allow for the cold weather, it won't lean out enough to bother anything, just run better. Down here in the 100 Degree weather, we get 10:0 A/F on stock and stage tunes. Cooler weather brings them much more in line, but it also allows more timing due to IAT adder tables and such.

On many setups, the amount you can compensate for weather changes is minimal, and an optimum power tune in the summer will be dangerous in the winter, and a winter tune will lose power in warmer weather.



Glad to hear that. Its fun, isn't it :)

So are you saying that the MAF's actually read different amounts of flow for a given MAF HZ value in colder weather? What about VE values? Because I have yet to see my wideband show any changes in AF and it's been down well below zero here a few times. Still ranges from between 11.5 and 12.0 WOT but I'm moving into higher airflow values in my timing tables, one cell away from maxing out the table on a 2.7 pulley. I'm not saying you're a liar or anything like that I'm curious as to what is changing and how to compensate for it if I have to.

it shouldnt really. the blower spinning faster will create more airflow, but the engine revving faster will also use more air faster...so psi should be the same. this is why you dont have 2x as much boost at 6krpm as you do at 3krpm, even tho the blowers spinning 2x as fast

Sorry, but it does. The stock cams only really make power till about 6,800 or 6,900 rpms. After that, they are pretty flat. When you run to or past the limits of your cam, the ammount of air flow per cycle will drop. Since the SC is still forcing the same ammount of air in per cycle, you PSI will begin climbing.

Hell, I make 13~13.5psi till I nearly hit 6,000 rpm. Then it steadly climbs before settling in at around 14.5~15psi at 7,200 rpm. That is from a Intercepter and not the stock gauge.

Sorry, but it does. The stock cams only really make power till about 6,800 or 6,900 rpms. After that, they are pretty flat. When you run to or past the limits of your cam, the ammount of air flow per cycle will drop. Since the SC is still forcing the same ammount of air in per cycle, you PSI will begin climbing.

Hell, I make 13~13.5psi till I nearly hit 6,000 rpm. Then it steadly climbs before settling in at around 14.5~15psi at 7,200 rpm. That is from a Intercepter and not the stock gauge.

ahh...okie. that actually makes sense. but if the stock cams arent making power hat high in the RPM band....why would you be up there? lol

ahh...okie. that actually makes sense. but if the stock cams arent making power hat high in the RPM band....why would you be up there? lol

they make enough power to be beneficial, especially because revving that high puts you right back in peak torque range when shifting into the next gear, unlike stock limitor

hey i just bought a used 06 ss. It has a full magnaflow exhaust and k &n typhoon intake. It also has the ss interceptor gauge. i dont no whats done to the engine other than it has a fronmount heat exchanger. the interceptor gauge and my stock boost gauge both have me peaking at around 19.5 20 psi. im guessing this is way off but the car is fast as fuck. anyone no what might be done to it? and if i sound stupid asking im sorry haha

have the interceptor display HP and tell us what you get...and keep in mind..it will tell you approx. how much bHP your making, not whp.

hey i just bought a used 06 ss. It has a full magnaflow exhaust and k &n typhoon intake. It also has the ss interceptor gauge. i dont no whats done to the engine other than it has a fronmount heat exchanger. the interceptor gauge and my stock boost gauge both have me peaking at around 19.5 20 psi. im guessing this is way off but the car is fast as fuck. anyone no what might be done to it? and if i sound stupid asking im sorry haha

either your gauge is so far off...

or

time to check that CAT

hey i just bought a used 06 ss. It has a full magnaflow exhaust and k &n typhoon intake. It also has the ss interceptor gauge. i dont no whats done to the engine other than it has a fronmount heat exchanger. the interceptor gauge and my stock boost gauge both have me peaking at around 19.5 20 psi. im guessing this is way off but the car is fast as fuck. anyone no what might be done to it? and if i sound stupid asking im sorry haha

You prob have a smaller pulley on there and tuned, or your cat is clogged. Do you have a header/downpipe too?

i no the CAT isnt clogged because i got it checked at a chevy dealership in tucson they basically gave it a 1 over before i bought it. and the hp on the interceptor gauge peaks at 255-260. hte other thing i was going to mention is that my supercharger is bright silver and my friend back homes stock was a dull gray. but it runs fine and im not getting any codes so idk whats done 2 it i can post some pics..

unless this is tested with a computer, that stock innacurate guage does not count. And this is such a typical css.net response. He has no idea what hes talking about, but hes damn sure of it. And yes there is something to worry about, his car isnt properly tuned for a higher PSI. Theres a reason that any good tuner will have a summer tune and a winter tune, and its for this very reason. Your car runs alot leaner in the cold weather.

i dont think the "winter leaner" theory is correct. i got a rich code the other day, so the leaner theroy goes out the window on that idea. i never got the rich code before until the temp droped. The code is cleared out now and it hasnt come back. Not to mention that the MAF has an IAT sensor built into it as well. So the computer adjusts for the colder temps.

ok i think i figured it out due to a trusty tape measure. i measured my pulley its 2.7" and its a zz performance pulley also it has the stage 2 fuel injector kit. i still think my boost numbers are off but hey what the hell it goes fast who cares

lol...................... hey guys theres something called a "boost gauge" in my car and it spins up when i press the gas?


EDIT: Okay holy shit I just popped the hood and theres a god damned supercharger under the mutha fuckin' hood!!!!! /end sarcasm

But really... I hope you have more than the stage 2 42lb fuel injectors with that 2.7" pulley. Unless you check the trunk or the engine bay and you find an additional tank for meth lol...

lol...................... hey guys theres something called a "boost gauge" in my car and it spins up when i press the gas?


EDIT: Okay holy shit I just popped the hood and theres a god damned supercharger under the mutha fuckin' hood!!!!! /end sarcasm

But really... I hope you have more than the stage 2 42lb fuel injectors with that 2.7" pulley. Unless you check the trunk or the engine bay and you find an additional tank for meth lol...

you need to see a professional and be heavily medicated

you need to see a professional and be heavily medicated

I already am... The proble is that when I'm on my meds I feel normal and think "Well I don't need these meds" and stop taking them. But I just need to realiaze it's the meds MAKING me feel normal. It's a common problem with people who are bi-polar.

If i dont take my meds then i dont get to touch myself.. Personal Rule...

I take my meds everyday.

You guys all need smaller pullies. Worrying about who makes the most boost on a stock pulley is like fighting a retarded kid. Even if you win, you still suck.

in more than one sense of the word... :lol: awesome quote.

lmao i love you guys

I was getting on the highway near my girlfriend's house last week on my way home, and it was literally 19 degrees outside. I put the car in third gear to climb the ramp. When I made it to the highway I just put the pedal to the floor, and watched the boost gauge. It hit 15 psi at around 90 mph. That cold air makes a huge difference.

Correct, but heat soak and stuff like that still allows a little more than 12.5, it also depends on the specific car. Some are really sensitive, others aren't.

mine boost just fine just have the boost bypass mod. I even hit 16psi in 24 deg weather. All on the stock tune and injectors :cringe:

boost bypass mod? on stock tune? i thought you couldnt go past 12.5 all stock... i'm confused i need a beer.

boost bypass is where u jam up the bypass so the ecu doesnt bleed anything ...


not good to do at all.

lol...................... hey guys theres something called a "boost gauge" in my car and it spins up when i press the gas?


EDIT: Okay holy shit I just popped the hood and theres a god damned supercharger under the mutha fuckin' hood!!!!! /end sarcasm

But really... I hope you have more than the stage 2 42lb fuel injectors with that 2.7" pulley. Unless you check the trunk or the engine bay and you find an additional tank for meth lol...
hey asshole im not that fucking stupid! haha i just bought the car used and i was trying to figure out what was done 2 it thank you for being a complete dick!!!!

oh my where's the love?

hey asshole im not that fucking stupid! haha i just bought the car used and i was trying to figure out what was done 2 it thank you for being a complete dick!!!!

We dont take kindly to your people.

Exploited - Sex and Violence

We dont take kindly to your people.

i apologize for swearing. i got mad cause i asked a question and instead of being cool about it someone mocked me and made me look stupid. i dont take kindly to those people

ok i think i figured it out due to a trusty tape measure. i measured my pulley its 2.7" and its a zz performance pulley also it has the stage 2 fuel injector kit. i still think my boost numbers are off but hey what the hell it goes fast who cares

A ZZP pulley should have the size written right on the front.

19 PSI is too much for a 2.7 anyway. What exhaust is on the car?

mine boost just fine just have the boost bypass mod. I even hit 16psi in 24 deg weather. All on the stock tune and injectors :cringe:

You don't count. Demon car you have there. One day, you are gonna let me unlock that PCM and do some tuning. Your car would shit on people with real timing maps.

boost bypass mod? on stock tune? i thought you couldnt go past 12.5 all stock... i'm confused i need a beer.

boost bypass is where u jam up the bypass so the ecu doesnt bleed anything ...


not good to do at all.

Mis information here. 'Boost Bypass mod' removes the PCM's ability to open the bypass back up if it detects an overboost or over temp or something of that nature.

The nature of the mod is removing the line from the solenoid on the blower and plugging the open line so you don't have a manifold vacuum leak. Its perfectly safe and usually results in a smoother driving car, as boost is more linear.

The "dangerous" aspect of it is when people run a lot more boost on a stock tune. Any tune can remove the boost limit, but you can't just slap a small pulley on a stock car and not expect something to be wrong.

The mod itself is fine, not exactly anything special, but I ran it for years on and off.
(Ghetto traction control: Boost limit 1st gear for street tires, then do bypass mod when you run real tires so you get full boost :) )

You guys all need smaller pullies. Worrying about who makes the most boost is like fighting a retarded kid. Even if you win, you still suck.

fixed.

Boost /= horsepower

[QUOTE=ItalianJoe1;3215370]A ZZP pulley should have the size written right on the front.

19 PSI is too much for a 2.7 anyway. What exhaust is on the car?



it has a full magnaflow exhaust. and i think the stock and the interceptor gauge are just way off cause i looked on some other forums and they said even with a 2.7 pulley i should only have like 16 ish so idk what the hells going on ha i do no that my damn transmission is leaking!:thumbsdow but thank god i have 3000 miles left on my warrenty!

[QUOTE=ItalianJoe1;3215370]A ZZP pulley should have the size written right on the front.

and it did have it marked on the pulley it was dirty though and i didnt notice until after i had measure it haha

You guys all need smaller pullies. Worrying about who makes the most boost on a stock pulley is like fighting a retarded kid. Even if you win, you still suck.
:lol::lol:


For him to be boosting that much on a stock pulley, sounds to me like he has a clogged cat. Cold weather will not raise boost to 15. If it isn't a clogged cat, your gauge is prolly going bad. Most of them aren't accurate anyway.

this is why we don't buy pre-modded cars from previous owners we dont know! lol. i made sure my balt was allll stock

You guys all need smaller pullies. Worrying about who makes the most boost on a stock pulley is like fighting a retarded kid. Even if you win, you still suck.

lmao what a way to put it

this is why we don't buy pre-modded cars from previous owners we dont know! lol. i made sure my balt was allll stock

this is true but i also just got everything fixed for free... and i got the car for cheap so i came out on top.. that is unless it blows up in the next month haha

lol well lets hop that doesn't happen. and i'm glad you got it fixed for free because thats the best price for anything...

lol well lets hop that doesn't happen. and i'm glad you got it fixed for free because thats the best price for anything...

haha yea you really cant beat free and if it does blow up now its my fault haha i still have 3k left on the factory warranty too

12.5 is stock? wow. In regular temps, i boost at 11ish. and in colder temps like 13, my gauge must be off.

this is why we don't buy pre-modded cars from previous owners we dont know! lol. i made sure my balt was allll stock

There is an SS out there that had 3 cracked pistons when I got called in to "put it back to stock". One engine rebuild later, its a completely stock car :)

There is an SS out there that had 3 cracked pistons when I got called in to "put it back to stock". One engine rebuild later, its a completely stock car :)

haha thats a good way to think

all i know when i buy another sports car later on... andi go back to the same dealership. they have evo's,srt4,m3's, etc... half of them are modded. but i walked up i was like is that red or silver cobalt stock? he said both are. and i was happy lol... the red one wasnt racaro edition...

all i know when i buy another sports car later on... andi go back to the same dealership. they have evo's,srt4,m3's, etc... half of them are modded. but i walked up i was like is that red or silver cobalt stock? he said both are. and i was happy lol... the red one wasnt racaro edition...

mine isnt recaro either but i still love my seats haha

i bet you mines faster... thats have a online race. i'll give you a car lead at a dig. 3 honk... hoooonk, hoooonk, BEEEP SCREEEEAAACHHHHH

tabeling gets the launch perfect and morano spins... he is keeping the lead cause the idiot gave him a car lead..... there half way through the ¼ mile OMG!! its an incredible race... whats the morning is pulling up to tabeling rear bumper... front bumper is now at tabelings rear driver side tire... omg he is doing the PIT manuever. HE PULLS IT OFF! tabeling is spinning out of control and ALL DAY's bumper is hanging on by a GM Clip! and ALL DAY wins while tabeling finishs the race in reverse and lost by 3 cars.... BOOOOOO!!!

i bet you mines faster... thats have a online race. i'll give you a car lead at a dig. 3 honk... hoooonk, hoooonk, BEEEP SCREEEEAAACHHHHH

tabeling gets the launch perfect and morano spins... he is keeping the lead cause the idiot gave him a car lead..... there half way through the ¼ mile OMG!! its an incredible race... whats the morning is pulling up to tabeling rear bumper... front bumper is now at tabelings rear driver side tire... omg he is doing the PIT manuever. HE PULLS IT OFF! tabeling is spinning out of control and ALL DAY's bumper is hanging on by a GM Clip! and ALL DAY wins while tabeling finishs the race in reverse and lost by 3 cars.... BOOOOOO!!!

that actually made me laugh

I forgot to mention, both the stock gauge and the interceptor pull from the same sensor, so they will always read the same if the sensor is bad or whatever the case may be.

Try hooking up a mechanical gauge as a test and see what it shows. If its still that high, swap down to a larger pulley and see what happens.

i bet you mines faster... thats have a online race. i'll give you a car lead at a dig. 3 honk... hoooonk, hoooonk, BEEEP SCREEEEAAACHHHHH

tabeling gets the launch perfect and morano spins... he is keeping the lead cause the idiot gave him a car lead..... there half way through the ¼ mile OMG!! its an incredible race... whats the morning is pulling up to tabeling rear bumper... front bumper is now at tabelings rear driver side tire... omg he is doing the PIT manuever. HE PULLS IT OFF! tabeling is spinning out of control and ALL DAY's bumper is hanging on by a GM Clip! and ALL DAY wins while tabeling finishs the race in reverse and lost by 3 cars.... BOOOOOO!!!

hahahahahahahahahaha that was funny as hell dude i cant belive you went all cop on my ass and spun me out .. not cool haha good race though