Sully84

simple question really, why is my 07 cobalt ss sc making 14psi of boost with stock pulley?

everything i read says my car should only be making 12 psi and to top it off i just had the sc replaced under warranty. im a lil confused with this. 14psi is where it maxes out at rev limit. had the car for 2 years and its always been like this.

SlowBalt_06

iTrader: (-1)

are there bolts holding the pulley on?

BankerBalt

Depends on altitude and weather too

Boost gauge COULD be off

Sharkey

iTrader: (1)

boost gauge could be slightly off, cat could be a slight bit clogged. that or you just have a factory freak.

Sully84

swapped boost gauge and just put in a new header and downpipe with high flow cat. no bolts hold the sc pulley on. entire sc has been replaced. i bought this car used. 70-80 degree day it makes 14 psi and on a cold day sub 50 it makes 15ish psi.

edit: im not that far above sea level.

silvercharged

iTrader: (1)

Wouldnt the stock tune bleed off boost after 12 if not tuned? Maybe it was tuned and returned to stock before purchase. I thought cat until i read more.

SlowCobaltSS

What kind of boost were you seeing before the SC was replaced under warranty

BankerBalt

Boost from a supercharger doesn't bleed off

silvercharged

iTrader: (1)

If it doeant bleed off whats the bypass valve for? Bypasses boost. Aka i meant that but said bleed.

Sully84

same boost with the old sc. got it replaced because it sounded rough (like marbles in the snout) and the techs at the dealer just agreed with me. lol.

i to thought the boost was limited at 12psi.

mrbelvedere

iTrader: (3)

if someone has messed witht the tune and being close to sea level you would see more

Sully84

alright, thanks guys.


if you feel like answering 1 more.....


is it normal that my water temp is a couple degrees higher now that i installed a header and downpipe?

im thinking due to increased engine bay temp as a result of no more heat shield.

silvercharged

iTrader: (1)

I too have had the temp go u a couple degrees with header install. Id say normal there as i have no leaks or loss of fluid.

Sully84

alright, thats all i had. thanks for the input guys.