I spoke with cameron ... he said anything below a 2.8 I wanna worry about a

piston ring... I trust him because of what happend against the str4 (sorry again, at

least u kick his skettle loving ass!)

What can I do to prevent this?.. I want to do stage 3 with a 2.7 or 2.6 pully and

install a waste gate to prevent over boostage....

I do not want to go as far as forging the pistons ... maybe sleeving them is as far

as I would go... any suggestions? Like maybe dont shift over 7200rpms?

Because I really want 330ponies to the wheels with the intake, cat back,

heads and customize tuning... Can these LSJ engines handle that kind of sexiness?

Anyone who has gone as far as a 2.6 please help!!! I wanna be sexy fast too !! I

want to kick an evo's 11 second ass!!!!!!

Oh and Please no guess estimates intakes on the subject.. this is very serious, I need to

know from experience please. .

I would appreciate this SOOOOO much... thanks y'all!

 

The LSJ block can handle a lot more than 330whp, but your not going to get to that number with the stock super charger and several other parts.

 

i dont think your gonna be able to get 330 wheel horsepower out of a)the blower and b)the pistons , more importantly the pistons i dont thing they will handle it , now , if you were to get pistons, which cobalt performance parts might be able to hook you up with a good deal and a new headgasket and headstuds then you would be able to push 330 but your either gonna need to cam it , spray a 30 shot or port the **** out of your head , or just run race gas all the time , the most reliable horsepower out of the stock block with stock blower i would say is about 280-295 , 290+ is really pushing reliability

 

well im pushing right now 250whp on my last dyno with a custome tune at 15psi
with the 2.7 thats like 20psi... intake and cat back heads and customize tuning wont get me 330whp?
what about 300 whp? see i dont want to spend millions suping this car up cus its going be an every day drive
but i want to do at least 12's

 

I dont see it happening.

 

*cry*
you ruin a lil boy with a cobalts DREAMS
i hope ur happy
oh well i run 13.9.. i will be happy with high 12's
i mean honostly ... is it worth it to go from a gmstg2 pully to a stage 3 2.6-.7 with 60lbs injectors? and customize ecu flash drives
i mean 20 psi is nice right?

 

I wouldnt go any lower than a 2.8, any less and you are overspinning the blower. You are still gonna be at 18 psi and will feel decent gains.
*also I would get 60's, you wouldnt need them right away, but better to be safe than sorry.

 

2.8 .. i dont need the kit? or what up?
i was thinking a 2.7 kit cus it comes with the harness and 60lbs injectors
even though
from 15psi to 18psi... how much gains? like 10 extra hp?
cus i was really looking into a 2.7 2.6 for 20psi
i want a 300hp car

 

If you want 300 whp right now you are going to have to get a very aggressive tune, meth injection... baiscally everything for our cars thats you can get. You can go with a 2.6 or whatever you want, just eventually you are going to nuke ur blower.
You arent really going to see numbers way over 300 til the tvs ,or twinscrew, or tags turbo come out.

 

A 2.7 pulley will yield about 18psi and will spin the blower above the 16,000RPM M62 redline at about 6600 RPM - give or take. The M62 seems to lose its efficiency after about 14psi. You will create more heat and while you will see a decent improvement in torque, your hp will not rise as such due to the increased heat.

 

Don't go smaller then a 2.8". If you really want to know why, go to the current twinscrew threat and look up my posts. You want your PSI to be as low as possible while you intake and exhaust flow are as high as possible. So instead of spinning your blower faster then a 2.9" or 2.8" pulley will get you, instead upgrade your drivetrain and get better flowing cams, port the heck out of your head, and get a really good flowing exhaust sized for your target horse power.

You also want to reduce the heat of the air as much as possible at all steps. That would start with heat wrapping or ceramic coating your intake, meth/water injection, a duel pass heat extractor, second or larger heat exchanger, ceramic coated or heat wrapped header and downpipe, and possibly an extractor hood.

All of that plus the better flowing head, valves (from cams & valve train), and exhaust will lower the pressure in your engine (and thous lower heat, detonation, and knock) while flowing more air mass (more to burn for more power).

If at all possible, you want to keep the psi to 12 or under with the M62, with 18psi being a hard cutoff (bad bad, don't go there) point.

 

i have been running 18-19psi with my 2.5" pulley and nothing is wrong except i get heak soaked after a run and have to cruise in 5th for 5 minutes to let the heat exchanger do its job

you cant install a wastegate on a supercharger

your also the same dude that said he trapped 109-110 with stage 2 are you not?

 

I have #60s a 2.6 intake full exhaust and Im going to be doing a heat exchanger and dual pass soon, I see like about 20 PSI Ive even seen 21+ on cold nights, but average is about 19-20 for me. but right now my car is on a relaly bad tune so it runs like hell, lol

but mines my daily driver nad I have No problems

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hehehe i will soon have 325 wheels... ahh gotta love turbo!!.. then a little engine building an ill b on my way lol... i was about to put a 2.6 on.. but then the turbo oppertunity arose so i took it!!.. i havent really heard any horror stories about the 2.6 so idk y all the sudden everyone is kind of against it.. alot of people are running a 2.6 an even 2.5inch.. actually isnt there someone running a 2.3? i know cobalt-addiction has tunes down to a 2.3 inch pulley lol... but for 300 whp i would pick up a water meth injection.. 2nd h/e.. dual pass... port the blower... port your heads.. get a nice header/dp.. nice catback.. a clutch.. maybe some axels (esp if your going to run drag radials or slicks) motor mounts an traction bars... an if bwoodys dry ice cooler fit on the cobalt i would say that.. but i think there is fitment issues... an cams wouldnt be a bad idea... u might actuallly b a little over 300wheels with all that...

 

dude pm about your turbo info bc i was looking to go that route.

 

you cant guestimate numbers based on parts and what some people have dynoed at. First of all with FULL bolt ons on the blower your going to get a little under 300, with very good tuning. IF you want more than 300, you are going to have to touch internals/go turbo/and or spray it. Best of luck with your build, and may i suggest please learn more about the car before you begin to mod it extensively, there is no wastegate on the lsj.

 

you have a giant heat pump on your motor.
overspinning this thing makes life worse on the motor.

2.8
header
full exhaust
good tune
water injection. happy car.

to achieve over 300 to the tire you have to do some serious ****, and won't be very street friendly.

with HP tuners, you can limit boost in first and second, thats it. you have to find other means of control after that.

 

ive seen it on a twin screw... he told me to drill into the intake manifold and somthing somthing

 

I hope this car isnt your daily driver if your shooting for over 300whp. I have learned that lesson the hard way with my last cobalt, iam going to tell you straight up, your going to have problems, and the car will break period, thats why this time around iam going a more dail driver warranty friendly.

 

are you dreaming , a 2.7 in your area might net you like 17- 18 psi maybe 19 with stock exhaust , i have a 2.6 full 3 in header back exhaust , and im hitting 17.5 psi , and i dont think im anywhere NEAR 300 maybe like 260 -270

 

Ok heres the deal. The stock pistons won't handle more than 310-320 CRANK hp (260-270 whp). Thats it, either get the forged pistons now, and be happy for a long time, or get the forged pistons after you break the stock ones. Your choice.

 

think of these engines, as a rotary engine. one major knock and it's gone with the levels that some of us are at.

275 to the tire is basically the max. and thats pushing it

or go turbo

 

Nice to see a fellow San Antonion... I bought the CA stage 4 kit, and having it installed as we speak. It comes with all the dressings and a 2.6 pulley. I have a full exhaust and injen intake, I'm gonna see about 260-275whp. 300's would be nice, but like fellow members have said, reaching that is gonna be a bumpy road.

 

so lts say i get 325 wheels with the turbo (which i will/am)... that will be alot better then getting that number with the heat pump correct?.. no power coming from the engine to spin the goddam heat pump?... just wondering.. im also going to up the compression by a little when i get pistons (hopefully this summer)

 

The pistons just can't take the stress of it. Its not heat its just the pistons are weak as ****.