Variable RPM Vibration issue HELP!

Nihill · 12-31-2023, 07:57 AM

So recently i had a guy replace my clutch with the 335is clutch, and when he returned it, there was a vibration. I know the answer is staring right at me. The vibration is RPM AND gear specific. as I approach 3k RPM in first, is shows up and is as aggressive as my acceleration (if i feather it past that RPM range its gentler). Then in second its around 2k RPM, 3rd is about 1500, and that correlation continues. I have replaced the guibo so that's not it. I thought it was for sure the fly wheel as I didn't resurface or replace it when I replaced the clutch, but i imagine it would slip more at peak torque, not exclusively at those Revs. I'm lost.

Jaronbwall · 01-01-2024, 09:20 AM

There's a strong chance it's the fly wheel... not much you can do. Drive it or tear it apart again. You can also get vibration, shuttering, and idle issues if the intake hasn't been walnut blasted, but that's probably not your issue.

12-31-2023, 07:57 AM	#1
Nihill Registered 0 Rep 2 Posts Drives: 2007 BMW 335i 6mt FBO Join Date: Dec 2023 Location: Huntsville AL iTrader: (0)	Variable RPM Vibration issue HELP! So recently i had a guy replace my clutch with the 335is clutch, and when he returned it, there was a vibration. I know the answer is staring right at me. The vibration is RPM AND gear specific. as I approach 3k RPM in first, is shows up and is as aggressive as my acceleration (if i feather it past that RPM range its gentler). Then in second its around 2k RPM, 3rd is about 1500, and that correlation continues. I have replaced the guibo so that's not it. I thought it was for sure the fly wheel as I didn't resurface or replace it when I replaced the clutch, but i imagine it would slip more at peak torque, not exclusively at those Revs. I'm lost.
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01-01-2024, 09:20 AM	#2
Jaronbwall Driving cars and riding bikes really fast 285 Rep 1,008 Posts Drives: 2009 335i Join Date: Sep 2014 Location: Indianapolis iTrader: (0)	There's a strong chance it's the fly wheel... not much you can do. Drive it or tear it apart again. You can also get vibration, shuttering, and idle issues if the intake hasn't been walnut blasted, but that's probably not your issue. __________________ 335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava
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