ACT 2600 Vibration/Harmonics

[4pistons]

I installed a Fidanza Aluminum flywheel along with an ACT 2600 clutch with the organic street disc in my '91 Mitsu Eclipse AWD replacing my Centerforce Clutch and stock flywheel. With no other changes I am getting strong harmonics from the drivetrain upon deceleration in gear in certain RPM ranges that I've never had before. Pressing the clutch or shifting to nuetral eliminates the vibration immediately. Under normal acceleration, even to redline, there is no vibration. I have stock rubber engine/trans mounts in good condition.

Is this normal with this clutch? Could it be from the lack of a marcel to cushion engine/drivetrain vibration? Is there anything I can do about it? It is almost unbearable in my street car. Anyone else having the problem?

Rick - '91 GSX

 

[miguels3000]

I have the act 2600 w/street disk and alumin 9lb flywheel, quaife lsd. and no i dont have any of those symptoms, my car is fwd its not awd. but when i did my swap, it feels very close to stock. very good street car. only difference was when im at certain speed im always at higher rpm levels. so before when i used to be in 3rd at x speed now im in 4th. nothing really.