Remyred07

Hey everyone I just brought my 07 SS Supercharged 2 weeks ago... Just wondering what's stock factory boost because I'm hitting 15 psi with out a problem.... I've read that some ppl are hitting from 3psi to only 13psi is this a problem.. Maybe the car isn't stock or something Idk just need some info. I'm in New Jersey so does that play a factor?

2007cobaltsc

Stock Boost is about 12 psi.

An aftermarket pully on the supercharger (smaller) will cause higher boost. My car runs 18 pounds of boost.

insylem

A Clogged cat will also cause higher boost.

ULWizSS

iTrader: (5)

yep check your pulley and see if it has any numbers like 2.8 etc.

mexi_loco

iTrader: (7)

welcome. take a picture of the pulley and we can help you a little better diagnosing the problem.

Remyred07

Ok sorry I'm late with this one... but ok ill post pics up later because I'm at work.... and which pully whould have a number on it the supercharger pully??

drumrush

iTrader: (8)

Yes

alleycat58

Sounds like it might have Stage 2. I thought S2 upped it to 15psi. Stock is 12.5psi

Remyred07

But how would I know if its stage 2?

alleycat58

Look at the pulley, if it's held on the hub with blue bolts you have S2.

If it's not from GM you'll have to look on the pulley for the size.

Bika

iTrader: (3)

A stock pulley will have no bolts, it is pressed on to the s/c shaft. If you have 4 or 5 little bolts holding the pulley on to a hub, then its been changed.

Also, If you have an aftermarket pulley, you should check to see if it has aftermarket injectors. Stock plastic clips on the injectors will be green.

Remyred07

Ok thanks to every one that helpped me with the info... like I said I will be putting the pics up later today... what if I don't have the pully what could be the other reason why I'm boosting at 15psi

Bika

iTrader: (3)

clogged cat converter.

EXsoccer1921

iTrader: (14)

that or you're in new jersey and its cold as ****. cold air means dense air.

Staged07SS

iTrader: (25)

This, and colder temps can also increase boost.

OP, what was the temp when you checked your boost reading?

When I was on the stock pulley, I saw upwards of 15psi in cold weather.

cobaltsssc760

Prob stage2.... If it runs good i wouldnt worry about it. Clogged cat would not only raise boost but car would run like ****.

Bika

iTrader: (3)

when I was stock I never saw more than 12.5 psi, even with temps in the single digits. (Yes I know I was a moron and it probably shoulda blown up from going W0T when its that cold out)

Staged07SS

iTrader: (25)

Meh.

Stock you wont't harm much. Pullied/custom tuned is a different story.

I logged 14.5psi on a 34*F day once back when I had the stock pulley, and GMS1.

Maybe my peak boost rose a little higher, because I was reving to 7k?!? Who knows.

Remyred07

Ok I don't remember what the weather was but it was sat night like around 10Pm I read 15 psi

Staged07SS

iTrader: (25)

Well, like others have said.... Check out the supercharger pulley, and report back to us.

bratboy90

iTrader: (7)

I thought on stock your bypass will immediately release upon 13 psi or something. So if he is boosting past that, he must have a tune at the least.

We need a pic of the pulley on the SC man.

Remyred07

You know what I forgot to tell you guys I have a hole in my flex pipe could that be one of the reasons why I'm boosting at 15psi I'm taking the pick of the pullies now

Whitnith

iTrader: (2)

Are you in Plainfield, IL?

We have a Chicago area meet coming up on Sunday in Bolingbrook. If you want to come out, the guys can look it over and figure out what all you have done. Let me know if you want more info.

Remyred07

Sorry I'm in New Jersey

Remyred07

OK I have the pics but I don't know how to post them I'm using my phone