Hi guys,
Working on an RS2 that has a high frequency vibration on the drivetrain. Only starting around 50mph, and then frequency gets gradually higher the faster you drive.
Acceleration, steady, or decelleration doesn't matter... it's there.
So it must be something in the gearbox/prop/diff area as it really doesn't feel like a wheel speed vibration, its faster pitched than that.
When you sit in the rear you really feel it in your feet, and the drone/vibration can be heard in the boot.
What has been done:
-propshaft rebuild with new U-joint, CV-joints, center bearing from GT500, and complete unit balanced to under 5gr
- made a bracket to mount the prop perfectly straight. After that even played with different shim height to rule that out. Also aligned the diff straight with prop.
-rear diff mount filled with window bondo, and also the rear diff carrier bushes.
-all wheels perfectly straight and balanced. Swapped them with another good set just to be sure, no difference.
-half-shafts in the rear new boots with fresh grease.
As a final test we mounted a different propshaft yesterday from another RS2 that drives without vibration -> problem stayed identical!
The diff has some play, but it doesn't howl or that sort of noise. Also can't notice any height play in the input shaft.
We dropped the diff oil, and didn't have any noticeable metal in it, BUT there was only 0.5l in the diff. So that's not healthy for sure.
Has anyone encountered such things?
Any input is welcome
Cheers!
Working on an RS2 that has a high frequency vibration on the drivetrain. Only starting around 50mph, and then frequency gets gradually higher the faster you drive.
Acceleration, steady, or decelleration doesn't matter... it's there.
So it must be something in the gearbox/prop/diff area as it really doesn't feel like a wheel speed vibration, its faster pitched than that.
When you sit in the rear you really feel it in your feet, and the drone/vibration can be heard in the boot.
What has been done:
-propshaft rebuild with new U-joint, CV-joints, center bearing from GT500, and complete unit balanced to under 5gr
- made a bracket to mount the prop perfectly straight. After that even played with different shim height to rule that out. Also aligned the diff straight with prop.
-rear diff mount filled with window bondo, and also the rear diff carrier bushes.
-all wheels perfectly straight and balanced. Swapped them with another good set just to be sure, no difference.
-half-shafts in the rear new boots with fresh grease.
As a final test we mounted a different propshaft yesterday from another RS2 that drives without vibration -> problem stayed identical!
The diff has some play, but it doesn't howl or that sort of noise. Also can't notice any height play in the input shaft.
We dropped the diff oil, and didn't have any noticeable metal in it, BUT there was only 0.5l in the diff. So that's not healthy for sure.
Has anyone encountered such things?
Any input is welcome
Cheers!
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