tylerjclance

iTrader: (7)

I just got my cobalt ss/sc back from the gm repair service (transmission) and now its pushing out more psi than before i brought it in. Before was about 10psi, now its a solid 12.5

Maybe this is a noob question but how much psi of boost should my stock 07 cobalt ss/sc be putting out?

SS Pyro IV

12.5

Staged07SS

iTrader: (25)

x2 !!

Chevycobaltss3

iTrader: (2)

12.5, if you had tranny issue like clutch slip your car will not get to the 12.5 due to the fact of no load on the engine.

xxxxsh4d0wxxxx

iTrader: (1)

That's weird.. I'm on GMS2 and I hit the 3rd bar after 10psi but that's only like what, 13.5psi?

Staged07SS

iTrader: (25)

Mods, location, altitude, & temp all have an affect on boost.

Chevycobaltss3

iTrader: (2)

^^^^^^ this is it, but he stated it happened after it got back from the dealer and he said it got more boost which tells me it was his clutch. no load on engine.

xxxxsh4d0wxxxx

iTrader: (1)

Well I'm stock too, besides GMS2, on a 55°F night I should hit more than that, no?

And my clutch has zero slip.

Chevycobaltss3

iTrader: (2)

wellll like we said altitude dense air, heat and so forth is what will create less boost or more. same with mods

tylerjclance

iTrader: (7)

No mods, and the clutch was fine. They did something with some bearing, i have to check the work oder again. They also did the power steering recall. Im in san diego, but i dont know what made it go to 12.5, no complaints, especially since that is where it should be

xxxxsh4d0wxxxx

iTrader: (1)

Okay, upon ripping on a back-road on my way home from work, I have, upon closer inspection, noticed that I hit the 3rd bar after 10psi. How much is this? And is this normal for GMS2?

Reason I say "3rd bar" is because I don't get our gauges.. 10psi, followed by 3 more bars, then 15psi. Like huh?

Staged07SS

iTrader: (25)

Here is a break down of the readings on our stock boost gauge. I agree that its tough to read (SS/TC has a nicer boost gauge). That's why I use my interceptor when I want a more precise reading.

0
1.25
2.50
3.75
5
6.25
7.50
8.75
10
11.25
12.50
13.75
15
16.25
17.50
18.75
20

It looks like you are making around 13.75-14 psi. Perfectly normal for GMS2.

xxxxsh4d0wxxxx

iTrader: (1)

Amazing. Thank you. You are one of the most helpful people I have come across since I've got my SS/SC, thank you for taking time to answer my questions.

If this site still had the "rep system", I would definitely give you some.

06arrivalSC

iTrader: (1)

Was just about to say this, it looks perfectly normal to me
And i agree our boost gauges are scaled weird lol

selfinfliction

you don't need more psi you need


MOAR PSI'S

ULWizSS

iTrader: (5)

I am currently also a GM Stage 2 and boost 15 to 16 any day since i have had it. On better nights i see 16 but average is always 15 and no less.

xxxxsh4d0wxxxx

iTrader: (1)

^ Lucky.

mrbelvedere

iTrader: (3)

no load required its a super charger not a turbo

Staged07SS

iTrader: (25)

Remember boost is a measure of restriction. More boost does not always mean more power.

tylerjclance

iTrader: (7)

Now that ive been driving it more, it wont go over 11.25 psi. Not sure why..

Staged07SS

iTrader: (25)

If youre on the stock pulley thats fine. What was the temp the day you saw over 12 psi? So many things affect your peak boost. Dont worry about it to much.

383_Stroker

iTrader: (3)

werd

xxxxsh4d0wxxxx

iTrader: (1)

Aka, IAT's. Your first few pulls are usually going to boost higher, especially if you have no cooling mods. ..Right? I think..

Render2009

iTrader: (4)

I see 15 psi with gm stg 3 u also had catless dkwnpipe

Staged07SS

iTrader: (25)

Generally timing gets pulled when your IAT2's get retarded high. Cooling mods are a must on these cars. Once you go below a 3.0" pulley it is a good idea to start upgrading your cooling system.