Boost Leak or Normal?
05-24-2012, 06:24 PM
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Boost Leak or Normal?
Hey guys, I just picked up a 2009 Cobalt SS t/c like 2 weeks ago and noticed that compared to my 2007 Cobalt SS s/c the Boost is much different, Aside from that the real question that I have is when I'm at WOT and lets just say for example I shift from 2nd at 6,000 RPM's to 3rd gear it seems like the Boost dosent hold steady at 15PSI going right into the next gear, Thiers a .25-.50 sec hesitation as it climbs to Max Boost. Is this just Turbo Lagg or a Boost Leak? It dosent sound or feel like I have a Boost Leak. I'm just used to Max Boost being held throughout the powerband range on my old s/c and just wanna know if this is normal for the stock tune, Thanks!
05-24-2012, 09:34 PM
#4
That's not turbo lag but it is normal, in an SS/SC the only area you have to pressurize is that little intake manifold and the runners leading to the head. SS/TC you have a bunch of charge piping and an intercooler plus the intake manifold.
Simplified you only had to fill 1ft³, now you're filling something closer to 4-5ft³. So it takes a fraction of a second to pressurize since you vent most of it between shifts. Unless you do an NLS, which though I do them a lot cannot recommend. Quite a bit of shock to your drivetrain.
Simplified you only had to fill 1ft³, now you're filling something closer to 4-5ft³. So it takes a fraction of a second to pressurize since you vent most of it between shifts. Unless you do an NLS, which though I do them a lot cannot recommend. Quite a bit of shock to your drivetrain.
05-25-2012, 11:20 AM
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That's not turbo lag but it is normal, in an SS/SC the only area you have to pressurize is that little intake manifold and the runners leading to the head. SS/TC you have a bunch of charge piping and an intercooler plus the intake manifold.
Simplified you only had to fill 1ft³, now you're filling something closer to 4-5ft³. So it takes a fraction of a second to pressurize since you vent most of it between shifts. Unless you do an NLS, which though I do them a lot cannot recommend. Quite a bit of shock to your drivetrain.
Simplified you only had to fill 1ft³, now you're filling something closer to 4-5ft³. So it takes a fraction of a second to pressurize since you vent most of it between shifts. Unless you do an NLS, which though I do them a lot cannot recommend. Quite a bit of shock to your drivetrain.
05-25-2012, 02:45 PM
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Congratulations on your new Cobalt, Sully20! Looks like you've already had your central question answered; if you're looking for any information on open recalls or existing warranties, please don't hesitate to get in touch! I would need the last 8 digits of your VIN to look into this.
Best,
Sarah
GM Customer Service
Best,
Sarah
GM Customer Service
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