I know that this isn't for an f-body, but I haven't been able to get a straight answer yet, and I'm hoping that you guys can help.
I have a '98 park ave ultra (supercharged), and I am going to do a tuneup on it. Now, I don't have any mods, but I am going to put in a 180* stat (195 stock), and I have heard that going 1 heat range colder will help, but I don't know if I should since 80-90% of my driving is on the highway. Will if hurt at all if I go 1 range colder? or should I stay stock? Thanks for your help!

 

Stick with the stock heat range if your running stock boost levels.

Once you put a smaller pulley on there and make more boost, you'll need some colder plugs.

 

All right, that's what I was wondering. Thanks for the help on that one. :thumbsup:

 

The stock heat range will be fine. I run a 3.40" pulley with the stock plugs and don't have any problems ('01 Grand Prix). 1 heat range colder and other mods would be recommended with a 3.25" though. Going to the 3.4" is worth about 15-20hp.

Tom