Don't know if this thread is still being read but the advertised gain from the GMPP tune kit was 30bhp.
I was more interested in the additional 80 lb/ft it offered. We still get hung up on bhp. Frankly these cars may be 'light' compared to many modern cars but as a two seater they are hardly svelte at all. The torque increase was quite noticeable in the '07 GXP I had the GMPP kit installed on.
One thing that makes me hesitant for several tunes is that vague terms are used to describe the results.
This may be a dumb question, but I recently acquired a solstice gxp with a GMPP stage 2 along with a cai and charge pipes. I'm looking to install a full exhaust with high flow cat. Do I need to get retuned after this?
I have a spec clutch I believe it is the 2 stage, and I have never been able to power shift this clutch. I have tried the throw out spacer and also put in a separate clutch resevoir. This clutch seems to be the problem. I have tried different transmissions and it still will not power shift. I...
I've been looking for threads and photos regarding the needs to solder stuff for the GMPP package.
Two threads are these: