manny45

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Alright guys I have looked for the answer for a few days and I see tons of different answers. I hope I can get help from some of u guys that have done it.

I have 2.4 cobalt its auto and supercharged. Im putting on the 42lb injectors and going to the 3.1 pulley. I want to know what is too much for PSI to run on my car. I dont want to blow a piston or anything. So I wanna know what my limit is later in the summer im going to get header/DP and exhaust on so I also want to know if that will be too much. I saw geneculley talking about not going over 250 before forging ur pistons.

I posted in the forced induction and no one replied. So hopefully I get some help here. I wanna get 10 PSI but dont wanna push it.Please guys I need some advice im getting this done this week coming up. Also im at higher elevation does that play a role?

Glowbalt

iTrader: (3)

You'll be fine...Im on 2.8pulley and 60lb injectors with an Injen Intake, 2.25" Exhaust....You'll probably push maybe 12 psi

manny45

What are your numbers? if you dont mind me asking. Cause I heard geneculley blew a piston but I think that was at 300 whp. As this is my dd i dont wanna lose it for a while.

Glowbalt

iTrader: (3)

idk my numbers yet...waiting for a group dyno day...plus I wanna upgrade the pistons/rods before I max it out on the dyno just to be safe

manny45

Oh ok I would think u are a lot higher than me. but Im aiming for 230whp at 9-10 PSI. Im gonna dyno tune. as im gonna be here for a bit til I can save money.

Glowbalt

iTrader: (3)

You wont get 230 with that

manny45

really....what do u think I will get? I saw a LT with just a intake and 9 psi get 220ish....

Glowbalt

iTrader: (3)

not sure..just guessing.lol

Staged07SS

iTrader: (25)

Yes he will.

He could be running 10psi and be making more power than a car with 12psi.

manny45

Can u explain a lil more please? Im sorry if I sound dumb but this is my first time with anything to do with a car like this and I figure ask questions and listening is the best way to learn. My car is said to be 171 hp and 163 stock.... so I figured with 8-10 PSI i could get 230 whp.

Staged07SS

iTrader: (25)

There are a lot of things that will affect boost on a blower car setup. You don't "tune in" a set boost level so much like you would with a turbo car. The size of the pulley, exhaust modifications, elevation, climate, etc. will all affect your boost level.

So say you and Glowbalt had the exact same car, engine, and setup .... If you had a free flowing exhaust, and he didnt, your boost level would be lower. You would be in turn making more power than him, but at a lower boost level.

manny45

Oh I see. Well I really wanna be making those numbers! I might have to go higher cause of elevation dont u think?

Staged07SS

iTrader: (25)

It's tough to shoot for an exact number, but if you research what the other 2.4L boosted cars have done you might find the setup needed.

Being that you live in a much higher elevation than most of us you may need to use a slightly smaller pulley to make the power of a car closer to sea level. So, Glowbalt wasnt totally incorrect. Anything is possible with a good tune though.

manny45

alright if I dont make those numbers its ok it gives me room to work with! Later this year I will be ordering Header/DP and full catback exhaust from zzp and should be near or close. to what I want either way I feel alot better now! thanks.

Staged07SS

iTrader: (25)

No problem man.