You and I have similar mods...you ever get yours dynoed? The GMPP Exhaust manifold make a difference for you?

 

I dynoed 256 whp last fall. I'm waiting to get re-dynoed this spring while running HOM (high octane mode). You should get the GM Stage 3 PCM. Runs much better than GM Stage 2. I felt a slight difference in the mid range from the GMPP manifold when I installed it 2 years ago. It also made the exhaust sound a little deeper.

 

Thanks for the input everybody!

 

NICE!

Ya I do like to have my A/C though, is there a way to have the Stage 3 PCM and still have the A/C running with something else?

 

Vince at Trifecta is working on it. Check out this thread man.

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/gm-stage-3-trifecta-204466/

P.S. I still have my GM Stage 2 PCM. I just switch out my GM Stage 3 PCM with my GM Stage 2 PCM when it gets real hot out.

 

Roger that! thanks for the info....hey do we have to do the crank re-learn or anything special when swapping between the two PCMs? My guess is no...but I want to be sure before I buy it. I definately need the option B installed and wonder about having a true nate 2.9 pulley if that is an issue with the GMS3 PCM.

 

You don't have to do a crank relearn with the GM Stage 3 PCM. It is complete plug and play

 

I take it I still need the dealer though for the initial install? VCI or whatever it is through the dealer tech line and the number given with the product like Stage1/2?

Sorry to thread jack...

 

Nope. GM Stage 3 is an entirely new PCM. No need to take it to the dealership.

 

Interesting....not sure I will do it since I have the 2.9 pulley and I already have a 2.79 pulley sitting around....

 

I didnt get to hit my full 25psi of boost,this was at 23.5psi in 4th gear at 7,000rpm .

 

Why did you dyno it in 4th? Usually on these cars they do it in 3rd.

 

It was in fourth gear,I was told a week after 3rd gear would of been more efficient. FML

 

UGGGHH i want everything off the TC but i want a supercharger!! life just isn't fair sometimes...

 

YouTube - ‪2008 Cobalt SS/TC Hp Tuned 324whp/372Wtq‬‏

 

Wow, killer numbers