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!

 

sounds like turbo lag to me ... use no lift to shift and see if it does it still

 

Sounds normal to me.

 

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.

 

Ok, Thanks Guys! I Appreciate all your Input as thats what I thought but just wanted to be sure, I'm not sure about doing the NLS because that obviously cant be good for your drive train as you stated in your post.

 

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