fredtoast

I have a 98 ITR with a jrsc plus Jim's stepper pulley (8-9psi). I've heard that ITR cams have too much overlap for forced induction. If I leave my timing at stock how much should I adjust the intake and exhaust cams? How much power would I gain? Everything else is stock except an AEM CAI. I know each car is different, but I was wondering what you guys with similiar set ups have done. I don't have a good dyno tuner available.

boosted hybrid

A good starting point would be -2 on the intake, +2 on the exhaust. I am sure it would need alot better adjustment than what i mentioned, but i dialed out most of the overlap with my gsr cams. You could even possible take it too -4 on the intake, and +3 on the exhaust since there is that much more on the itr cams.

speedy108

Try the other way around. -2 on the exhaust side and +1-+2 on the intake side.

turbotypeR@SPEC

mine did better with the exhaust advanced and the intake retarded

boosted hybrid

This is usually the case. Every engine is different, but to dial out overlap you retard the intake and advance the exhaust cam.

fredtoast

Thanks for the info, guys. I was wondering how much power will I gain from dialing out the overlap? Is it worth the money? Cam gears are cheap, but I will have to pay for the work.

boosted hybrid

With a supercharger in the neighborhood of 10-15whp. With a turbo probably 30-40whp depending on alot of variables.