2007 SS/SC idles at -9.5 PSI, wont go over 0
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2007 SS/SC idles at -9.5 PSI, wont go over 0
Hey guys,
This is my first supercharged vehicle. I understand the boost gauge should read 0 at idle when you start the engine. Mine is -9.5PSI. It also feels no more powerful than my PoS 2.0l jetta, naturally asperated. When i punch it to redline, it goes JUST over 0 PSI
Bypass valve actuator moves freely. What else could this be?
This is my first supercharged vehicle. I understand the boost gauge should read 0 at idle when you start the engine. Mine is -9.5PSI. It also feels no more powerful than my PoS 2.0l jetta, naturally asperated. When i punch it to redline, it goes JUST over 0 PSI
Bypass valve actuator moves freely. What else could this be?
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Sounds like a massive leak somewhere. If I had to guess, air is getting in after the throttle body causing the less than expected vacuum at idle, and getting out at the same place causing your lack of boost.
#8
Yes the - is normal at idle, should be about -20, the other issue? I agree with the leak or vac line hole so ur gauge not reading right. Ss sc doesn't really feel very powerful stock, iv driven one, wasn't impressed, but that was coming from my sstc on tune lol
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Thanks for all the quick replies by the way. Glad i signed up.
#11
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At -65kPa you're right where you should be for idle, idk why they would list it as 0kPa for idle. How much kPa are you getting when you WOT first or second gear? (Have a passenger watch the gauge, also the gauge is electronic not mechanical)
#12
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when the car is "off" the gauge should go to "0" ... as soon as you start it should be in the vacuum (negative).
-65kPa = -19hg ... aka your golden Pony Boy.
What is the boost at WOT ?
are you reading my mind ???? lmao
im typing and then i see your post right after i hit enter lmao
-65kPa = -19hg ... aka your golden Pony Boy.
What is the boost at WOT ?
im typing and then i see your post right after i hit enter lmao
Last edited by yellowsupercharged06; 09-27-2013 at 02:49 PM. Reason: Automerged Doublepost
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So if -65 kPa is normal for idle, how high should it go at around 4500 rpm?
Also, what could cause vacuum to be normal, but boost to be nill?
If there were a leak, i would imagine the vac reading would be less too? I dont actually hear a leak, but its hard to say. Any troubleshooting steps i can try?
Thanks again for your help with this!
Also, what could cause vacuum to be normal, but boost to be nill?
If there were a leak, i would imagine the vac reading would be less too? I dont actually hear a leak, but its hard to say. Any troubleshooting steps i can try?
Thanks again for your help with this!
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Nope, in 2nd and 3rd too. I floor it, and it stops steady at 20 kPs (2.9 PSI) and won't go any further.
I've been driving a vw gti VR6 for the past couple years, and this cobalt is supposed to beat it from 0-60 by about 2 seconds, but at this rate a friggin camry could beat me.
I've been driving a vw gti VR6 for the past couple years, and this cobalt is supposed to beat it from 0-60 by about 2 seconds, but at this rate a friggin camry could beat me.
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what would be the best way to identify this? i think i might have a leaking gasket. besides pulling the blower off cause i got no shop space atm
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