HERE IS WHAT MY GM ENGINEER said about stage kits and HP
Ken-
I was able to get some quick feedback from one of our guys in GM's High Performance Vehicle Operations. They've heard from other customers who are seeing 226 whp with the Stage2 kit. Your 224 whp at a standard conversion of 85% mechanical efficiency through the transaxle comes out to 263 hp at the fly wheel. Our Stage 2 kit is advertised to produce 241 fly wheel or brake hp at the engine.

Most of the 'next steps' for you would void your warranty and/or be "off-road use only." We have an exhaust-ported head that we will release in the near future. Other parts might include Comp Cams camshafts and PSI or Bates valve springs. You could also consider adding an ice bath to the intercooler. GM is working on an Off-road Stage 3 kit with a smaller pulley, a 100 octane calibration, and a 2-pass intercooler, but none have been approved for sale at this time.

Also, if you do end-up getting close to 300hp, I want to make sure you know that your production pistons/pins will be marginal at that point. When you get there, you'll want to consider upgrading to an aftermarket (such as J.E. or Diamond) piston.

Best,

 

Ive heard of all this before and sounds very good for the future of our cars.Glad to see more of this comeing out backs up what i was told.

 

I know, just thought everyone would like to here it from GM tech. She works with Erica Nocita race team and all the others. Meet her at Moroso in april

 

Good to hear something semi-official on future parts, even if they may not be streetable!

 

well I smell BS or things got lost in translation - inter cooler is already double pass. GM tried to improve on the pass by adding a third pass that had less than 10% improvement. they run griifin radiator that has room d/t removal of the A/C radiator. this is only needed when running for long periods of running continuous boost in these racing conditons. we would see little improvement.

oh and I know of people running 245WHP with stage 2

 

Sorry Production has singal pass intercooler the Time Attack Cobalt Ran Griffin Dual Pass My quote is a past & copy from GM Sportcompact division,
CarmenIf you have the ecotec Sport Compact Build Book Page140

 

I have heard of some kind of stage 2+ kit which is supposed to have a smaller pulley. If this is true when is it coming out and will it be streetable and/or under warranty still

 

yeah the dude that does media relations for gm emailed me a while back and said there were plans for a stage 2+ but he didn't mention a stage 3 at all

 

underneath your hood looks sick man

 

Yup, S3 is comin. That doublepass heat exchanger is really gonna help some of the Intense kit guys. I know with the 2.5 and 2.6 theyre running pretty high intake temps. Ice box would be really nice of someone designed and sold one.

 

Hint, hint.. HAHAAH

 

oh and I know of people running 245WHP with stage 2[/QUOTE]

including me

 

Ahem dual pass intercooler RADIATOR (key word is RADIATOR). and they can fit it once A/C condensor is removed.

When I was talking about we have two passes already I was talking about the intake manifold itself is two passes. this is where gm came up with a possible way to increase cooling of the air after putting on the 2 core (2 pass) Radiator they attempted to increase cooling of the air in the manifold by fabricating two passes in to three passes. It did not work that well.

 

ur supercharger looks nice!

 

Off topic question to slacker,
I have a gmpp stage 2 in my car, i was wondering if you would recoommend the gmpp manifold and catback? or would you go with something like the ZZP headers and magnaflow catback?

 

its a sngle pass heat exchanger...they mod it for dual pass and it helped a lot but triple didnt...i really dont think we need additional rad cooling

 

i made 250 whp and 240 tq wiht mods in sig no tuning besides gm flash

 

taht is awesome. I have just GMS2 and a drop in filter. If I complete the mods I dentical to yours and get DR's then I could be in the 12's! Currently my Best quarter is in my signature. LOL we had our last track day yesterday. cant wait till spring. I have work to do over winter time.

 

some Cobalt SS/SC had higher hp reading sraight out of production. i had an 05' and on the dyno it put out 216 hp stock. now i have an 06' and on the dyno, it put out 208 stock. so maybe thats why some people have higher hp reading with gmp stage 2 kits then the next guy.

 

that is quite possible. even two factory cars can have different output due to engine difference internally that vary with tolerances in the production of cam timing etc.

Here is what I know for sure. My car did 14.7 stock for agrument sake maybe someone could have got 14.6 or 14.5 due to my driving. I went back and got a 14.2! now even more amazing I learned more on the shift points with stage 2 (it is different than running the car stock) and I got 13.9!! so regardless of DYNO machine. the seat of your pants will find a difference and no matter how good or bad you are at the track you will go faster than before. If you learn to drive better after GMS2 you could take .8 of your 1/4 mile time like I did. Oh and by the way it all came down to technique for launch and shift points. I shift just as quick as the next guy.

 

i agree

 

This is for SSsnipes

I have about the same modds as you, but i dont ever go to the track. So i have experimented with diff launching methods... If u drop the clutch with alot of gas it wheel hops= slow. I though dropping the clutch at around 2500rpm and moderately pressing on the gass till full throttle and shifting when the tach hit about 6600rmp gave me best results. Well felt the best anyways. Can u tell me your secrets since you get to take your car to the track, unfortunatly there isnt one close to my house. Thanx bro
Martin