I installed my JRSC in my 95 GSR a lil while ago, and have been running stock timing, with no boost because I didnt have the SC belt tensioning adjustment screw since it fell out. (got it now, but trying to fix this problem first before adding boost).

Well, whenever I drive my car like this, it should be driving like its stock, even tho it feels a lil bit more sluggish (due to different manifold), but whenever I bring it up to redline now, at about 7700 rpm or so, my gas pedal will start to shake violently.
This happens in every gear, sometimes the shaking isnt as pronounced as other times.

I've heard a few people tell me it might be the clutch just not being able to hold that much power at those rpms since im still on my stock clutch, and its starting to just barely loose grip, but i've driven cars with slipping clutches, and they didnt shake like this, they just slipped and that was all.

Any ideas to what could be causing this?

 

um, sounds like something is shaking the whole car, fix the belt tension, then come back and ask this...