Is it clutch chatter?

[CrisZenithBlue]

hi guys,

updated on what ive done so far to fix this very slight vibration:
- replacing transmission mounts did nothing, vibration is still there
- flushed out transmission fluid (5 sp manual) and filled with Porsche good/expensive stuff. didnt help
- i checked around for anything loose like heat shields or exhaust but nothing seems to be out of place

the vibration i am getting is fairly subtle and it happens in any gear when i hit 36MPH up to 39MPH and i feel it the most when i'm only slightly on the gas. if i press harder i guess with more torque everything shifts and i dont feel it anymore. i can feel it a bit under my foot on the gas (how come? since it's drive by wire for my 2000 model. maybe it comes through the floor since the chassis is tight and transmits vibration?) and i noticed when i steer left and right like doing a slalom i can feel the vibration at those speeds mentioned above.

my next and final suspect would be the engine mount which i will do in the near future.
anybody have any other opinion or suggestion?

thanks,

Cristian

[brybart]

Check your wheels and brake rotors, check your CV's too

[CrisZenithBlue]

replaced the engine mount bushing with a new one and while the vibration has been reduced and i can barely feel it anymore it's still there at around 36mph in any gear, any rpm. the new mount is nice though.. everything is night and tight now.

brakes are fine, just replaced the front rotors and pads this weekend (wooo hooo!! new brakes are AWESOME!!) and i also checked CV axles. no play in them except for the movement left to right between the wheel and the transmission but i assume that is completely normal.

i'm running out of ideas guys.

this is coming from the back somehow.. could it be my rear tires that are on their way out? they are pretty much worn down to the legal limit but i was gonna ride on them for a while longer, the wear is very even and it doesnt really rain too much this season here in FL so i feel safe enough.

maybe the wheels need to be balanced/road force tested?

[Steve Tinker]

Originally Posted by CrisZenithBlue

it's still there at around 36mph in any gear, any rpm.

If the vibration is speed related and not engine / transmission revs related, then it has to be caused by a wheel / driveshaft rotational problem. Changing engine mounts, clutch flywheel or muffler brackets won't help....

I would hazard a guess its your worn tyres - as a quick (free) trial, swap the rear wheels to the front and vice versa. I know the wheel sizes a different, but it may give you a clue to the problem, especially of you can feel the vibration through the steering wheel instead of the seat of your pants.

[CrisZenithBlue]

these are all good points thanks guys!
i'll stay on it and report back.

cheers,

Cristian

[CrisZenithBlue]

so the vibration I was chasing for a few months was because of the front tires.. ugh!! I just got some new shoes on the front and no more vibration at 36mph.

case closed!

cheers,

Cristian

[paulofto]

Good for you. Must feel great to finally resolve a nagging issue.