Hey guys. 99' 6 speed. Just bought it and noticed There is a clunk whenever I let the clutch out while shifting. If I match the revs it doesn't do it but if I shift slowly and let the revs drop it does make the clunk. The sound is sort of a bass drum sound. If it's not normal I'm thinking motor mounts but I really don't have the other symptoms I've seen described here for worn mounts.

Thanks.

-Mag

 

A "clink" is different than a "clunk". A higher pitched clink might mean something in the clutch/gearbox or shifter mechanism. A lower pitched clunk is probably something like the motor mounts or transmission mount, or even rear axle CV joints. Year/mileage would help us guess. Does it happen as you shift, or when the torque is applied by the engine when letting out the clutch?

 

Definitely a clunk.
99' with 32k miles.
Happens as the clutch is let out all the way. Only happens when engine speed needs to catch up to vehicle speed (if I took too long to shift or didn't rev match).

Thanks.

 

You should always match wheel revs with engine revs as the clutch is released. If you don't then you will hear the 'clunk' as the clutch plates hit and grabs. I know this as I rode along with a friend of mine who was driving my car and he got the revs wrong and let the clutch out fast and we heard the 'clunk'. I jumped on him immediately. I never heard it again. I never hear it when I drive the car. I drive correctly. Catch those engine revs with the speed of the wheels. Stops the 'cluck' and saves the wear on the clutch plates. Why are you effing around man and then asking a stupid question?? Check your motor mounts and if they need to be changed, change them. The clunk has nothing to do with the motor mounts. Doesn't matter if it's a C2 or C4. It's how you drive the car.

 

Hmm...I was going more for a mechanical "clunk" than a driving technique. I have to agree with Hurdi. Since you just got the car, more practice on smooth shifting. It is a subtle technique (more seat of the pants than technical) that requires some practice to match engine revs to road speed to shift points.

 

The clunk you're describing may be from the Dual Mass Flywheel. It will also clunk if you floor the throttle, then abruptly pull your for off the gas. Since the flywheel is sprung, when it goes from loaded to unloaded, it snaps back and forth on itself, and hence the clunking noise.



First time I drove my Porsche, I also thought something was wrong, since no car I owned before had a DMF, but it turned out to just be characteristic of that setup. In some cases, however, if the clunking is bad enough, it may be an indicator that the springs in the flywheel have worn out.

 

If you and your passenger toast with wine glasses it will make a "clank" sound. Rule that out first.