Dr.Dan

New to the site.. So here's the issue. I have an ls6 zo6 motor, new from Scoggins dickey in my 99 miata. put it in a month ago. it's full race. scca and nasa. It was at the track a month ago for the very first time.. A little back round. the balancer that was used is the one from the builder no keyway. the flywheel is steel 0 balanced with a center force clutch pack. and a tilton hydraulic throw out mated to a T5 trans. It ran fine at the first track day. it was raining and speeds were low and I was breaking it in. the next week , another track day, aand a dry one so I had a chance to get on it more. now remember all the components are new. all of them. The car has deveopled a high freq vibration from about 3-5k+. it's like sitting on a hugh vibrator!. since then I've remove the trans and ran it static with the exhaust hooked up. the bell and clutch pack still on. same problem. it's not in the driveline. Does not seem to be missing at all. (have not pulled codes yet), but it feels strong. balancer seems true. what else could it be? it shifted fine. I'm not to knowlegable with center force clutches with those wieghts inside. Any ideas? I'm about to drive it into the bay..My feeling it's at one end or the other. has to be.. no?

O2Form

Well before you go any further pull the clutch and pp then run it.

Paul 75 L82

iTrader: (1)

It's got to be in the flywheel, clutch or pressure plate. It really doesn't matter that they are new, can still be out of balance.

01ssreda4

iTrader: (96)

My vote is the clutch area.

ND400

No way a ls6 factory bottom end is going to be out of whack. Done many ud kits without drama. Again my vote goes clutch or check your engine mounts make sure nothing is rubbing.

garygnu

check all rotating masses.rotors ,drive shaft,U-joints,tires.1 missing bolt could it.