Thread: 97 GTP has hardly any power.

Originally Posted by guimond47

Plugs are roughly 3 months old .
Wires are new from ngk.
Running regular octain 87
I dont put nothing in the gas,
Stock pully
No pcm programmin done
Post are clean on the coil packs and trottle body screen is left there stock and is in place..

.... Soo thats why i have power before it warms up.. Should i change my thermostate?you think i need plugs. Which ones should i get? Help me out plz

Found the knock problem. Very gently and nicely w/o going past 1/3 throttle burn off the rest of your tank and fill up with 93 octane from now until you sell the car. leave the plugs and wires alone. they are likely fine.

The reason octane is so important in these motors is because of the added boost pressure. What happens is the cylinders get hot very quickly and that can make lower octane fuel burn before the spark ignites it. This causes predetonation. The more boost, the more likely the air/fuel charge will ignite before the correct time. It's also very easy to chip a piston when beating it this way. The octane keeps the fuel from igniting as easily.

The fact that you are running 87 octane only strengthens bill's fact that you are probably causing high KR

Want to learn more? http://www.grandprixforums.net/what-...here-1507.html

Octane booster usually raises octane one point. Meaning if you start wtih 87.0 octane, you end up with 87.1 octane. that's a lot of booster.

Yes it is expensive for you. I have friends up there. It's what your car was born to guzzle. Sorry.

Yes, the power loss you have is due to detonation and your computer is reducing the timing to save your motor. Your lucky if you didn't already chip a piston or trash your engine.

If you have to... drain the gas... sell it to someone.... and get 93. You have a very high potential of ruining your engine running 87 octane.

I knew nothing about what octane actually did before I had a supercharged car either. Once you find out it's like ...Oh.. crap.

In your case it'll be "oh crap .....eh!"

is it running hot? those superchargers get real warm under that plastic cover on top of the motor. just take it off and try running it like that.

Keep in mind.. the pcm will be using the low octane timing tables it's gonna take maybe 50 miles or so until you start seeing the timing come back. Without the knock though..you will likely feel power within the first 20 miles.

If you don't, then it's very probable that you chipped a piston and need a motor. Shattt doesn't quite desribe the feeling you'll have if you hurt the motor by using crap gas. Hopefully ...the pcm saved you.

Any mods?

Stock car or a few bolt ons but still a stock pulley I'd say AL605 or 606's gapped @ .050".

3.4" setup...AL104's.