Drivetrain noise at 4100 rpm?
After installing the ACT clutch and Comp flywheel a few months ago, we have since developed a strange, worrisome noise that we need help diagnosing. It started about 3 months after installing the clutch and flywheel, with no problems until this point.
No problems noted in driveablility at all. Car works fine and is awesome!
So we now have a higher frequency buzz/rattle which starts intermittently around 3500, resonates at 4100 rpm and diminishes around 4500, like marbles in a small can. It is coming from the engine compartment, behind the driver's seat. Does not occur at idle, when coasting in neutral, or revving engine without clutch engaged.
It only occurs when moving, clutch engaged, under steady light load, maintaining speed, in any gear. Speed variation does not affect it, only throttle modulation and depressing the clutch. It is always at 4100 rpm! I tried jiggling the gear shifter and feathering the clutch, no changes.
On hard acceleration, no noise all the way to redline!
What could it be? I don't think it is a wheel bearing, or CV joint. Do not think it's the differential or transmission. Could this be a defective clutch plate or maybe the little plastic clutch tool centering ring that we had to leave behind the flywheel coming loose?
Appreciate any advice on how to figure this one out.