Car Vibrates at high RPM
#1
Car Vibrates at high RPM
Ive been having this problem for awhile now..
When I WOT or even rev while the car is rolling & in neutral and get to ~6k the car begins to vibrate pretty bad. It is particularly bad in 3rd gear WOT. When I get the RPM up range my seat feels like a vibrator!!
NOTE: the car does also vibrate when under load below 3k rpm in 2nd, 3rd 4th gear but not so much 5th.. I have a Diff brace also but I took it off and didnt cure anything. I think its related to the tranny or engine since it still does it when in neutral.
Thanks for the help guys.
When I WOT or even rev while the car is rolling & in neutral and get to ~6k the car begins to vibrate pretty bad. It is particularly bad in 3rd gear WOT. When I get the RPM up range my seat feels like a vibrator!!
NOTE: the car does also vibrate when under load below 3k rpm in 2nd, 3rd 4th gear but not so much 5th.. I have a Diff brace also but I took it off and didnt cure anything. I think its related to the tranny or engine since it still does it when in neutral.
Thanks for the help guys.
#3
I have noltec mounts which are new along with the garfinkle brace. Removing the brace didnt change anything as well. Ppf seems fine also.
I did swap trannies recently and i noticed the shifter sits alittle more to the right. Im thinking my tranny may not be aligned properly?
I did swap trannies recently and i noticed the shifter sits alittle more to the right. Im thinking my tranny may not be aligned properly?
#6
Since it occurs at high rpms, I think its load dependent and in direct contact with the motor. maybe the pilot bearing but I would think a faulty pb would cause other affects. Could be clutch, ill have to inspect it.
I still have a gut feeling about something else. I will try to get wrenching this weekend
I still have a gut feeling about something else. I will try to get wrenching this weekend
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#8
Racecar - Formula 2000
You probably have something out of balance in the engine/trans assembly. I would suspect the clutch might be out of balance. Did you replace that when you R&R'd the trans? How about the flywheel or counterweight? Anything change there?
#10
Racecar - Formula 2000
Then that's the first suspect. Make sure it is correctly balanced and not, somehow, off center.
#11
alright guys, I started to work on this issue last week. im starting with the more simple possibilities and working my way to more severe/complicated.
I correctly clocked my noltec mounts and no cure..
I am loosening up my ppf and tranny and want to correctly align them, (my tranny is tilted slightly to the right)
If ppf adjustment dosent work, I am going to take out my tranny and inspect the counterweight, flywheel etc. After that the only possibility is a unbalanced engine. my motor has 50K miles and its originial pulling good vaccum. I hope its not the motor.
I correctly clocked my noltec mounts and no cure..
I am loosening up my ppf and tranny and want to correctly align them, (my tranny is tilted slightly to the right)
If ppf adjustment dosent work, I am going to take out my tranny and inspect the counterweight, flywheel etc. After that the only possibility is a unbalanced engine. my motor has 50K miles and its originial pulling good vaccum. I hope its not the motor.
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