05-04-2013, 03:03 PM
Join Date: Nov 2012
My Ride: M3
Originally Posted by 323tom
I agree Mert, last year I only went up to Iboost 3 of 5 with 80 % ethanol content which I believe was around 26-28 psi and 800whp+ and I can tell you I was frightened when I heard the pro efi traction control go off for this first time, it felt insane! I never tried Iboost 5 as the vibrations my car was making was also scary, I believe it was the 1 pc drive shaft that I had removed now but SP says there is still vibrations but not sure if as bad as before.. Are you running solid motor/tranny mounts?
I do run stock mounts all over.
I used to have 1 piece carbon sheety meety pitty shaft, which failed 2 times.
I ended up with oem BMW shaft.
Although it failed, it did not make any vibs.
My 3 M3s do not vibrate.
What may vibrate on your beast:
- check the transmission, you may have damaged the tranny and it may vib. It may be the 1st to check.
- guibo, cheap product, test a new guibo.
- vibration damper, test a new damper.
- all pulleys, ac pulley, coolant pump pulley, steering pulley.
- flywheel, get it balanced.
Does the vibration happen at each gear between a certain rpm range_?
Have you tried driving @ 2nd gear @ 7000 rpm and is there any vibs or does it vibrate @ over a certain road speed?
Havee you checked your Wheel bearings?
XM3 = E46 M3 Sedan All Wheel Drive Twin Turbo
0-60 mph 2.7 seconds @ 15 psi
E46 M3 Coupe 60-130 mph 4.23 seconds