I have a problem with clutch "shudder" in my R8 with an R5 Alpine motor. The car shakes violently when I let out the clutch in reverse. The shaking is worse when I try to back up on an incline. I get a similar vibration when down-shifting to 2nd gear without rev matching, but its not as severe. Up-shifting is not a problem though. I believe the problem is caused by the increased weight of the R5 motor compared to a stock 1100 motor coupled with too-soft gearbox and engine mounts. I've installed stiffer mounts from Mecaparts, but that hasn't reduce the problem. Could it be related to the clutch itself? The flywheel and clutch are from a Lecar (R5). The flywheel has been resurfaced and the pressure plate, disc and release bearing are new. Has anyone else had this problem when adding a heavier motor to an R8? Any ideas on what might be the cause of the vibration?
Bob G
Bob G