08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

boost issue

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Old 09-12-2011, 10:28 PM
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boost issue

just had a boost issue the car peaked at 15psi hard on the throttle while my foot is on the throttle it hit 15 then dropped suddenly to like 10-11psi and held there.

maybe a boost leak? sorry for the noobie ness.. im also getting another p0100 last time the dealer said a wire came loose from the torque. on the ecm side and the sensor itself was legit. i cleaned it with maf cleaner kinda annoying.
Old 09-12-2011, 10:30 PM
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maybe the car was compensating with a lower boost since it has the learn down feature?

does it feel slower than before? if not it probably isnt a boost leak. im pushing 27psi and all i have is the same charge pipe as you after the turbo
Old 09-12-2011, 10:36 PM
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probably just the learn down
Old 09-13-2011, 10:11 AM
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Maybe learn down, When I was stock, I boosted 20psi about. I ran around thinking I had GMS1 for the longest time.

Then I realized I didn't have GMS1 sensors and just learn down gave me more boost.

Also when I was tuned by ZZP and completely, I boosted like 23psi then went down to 16psi before I hit redline. I didn't have a boost leak either. It was just how I was tuned. So I went below what I was doing stock for a bit. I still dyno'd more than stock, but I boosted less.
Old 09-13-2011, 10:13 AM
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Sounds common on a stock TC with no tune.
Old 09-15-2011, 11:29 AM
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Originally Posted by bspeed
just had a boost issue the car peaked at 15psi hard on the throttle while my foot is on the throttle it hit 15 then dropped suddenly to like 10-11psi and held there.

maybe a boost leak? sorry for the noobie ness.. im also getting another p0100 last time the dealer said a wire came loose from the torque. on the ecm side and the sensor itself was legit. i cleaned it with maf cleaner kinda annoying.
Did the weather change to colder temps from the day before ?
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