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Old 07-03-2009, 09:43 PM   #1
george_328i
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Gear Box Chatter

Hey Guys,

My Buddy has an m3 conversion with a light weight flywheel and prformance clutch. Everytme he pulls up all you can hear is a chattering noise from the gearbox area. The sound seems to go away when he pushes the clutch pedal to the floor. Do you guys think it could be because of the light weight flywheel?
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Old 07-04-2009, 02:11 PM   #2
Trouble65
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Quote:
Originally Posted by george_328i View Post
Hey Guys,

My Buddy has an m3 conversion with a light weight flywheel and prformance clutch. Everytme he pulls up all you can hear is a chattering noise from the gearbox area. The sound seems to go away when he pushes the clutch pedal to the floor. Do you guys think it could be because of the light weight flywheel?
That's what I would think. My 540i/6 has carbon fibre clutch and does the same if I'm to easy on it.
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Old 07-04-2009, 02:42 PM   #3
spoony_prelude
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Same with mine. When the clutch pedal is pressed down, the noise stops. When I release the pedal the noise starts. Although not sure if anyone else has noticed but theres a difference in how loud it gets by how much amperage im using for example. If I have my lights on, its pretty loud, meanwhile I turn my lights off and the noise goes down quite a bit!

Jay
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Old 07-04-2009, 07:14 PM   #4
dbworld4k
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It's the Flywheel.

http://www.uucmotorwerks.com/flywheel/gear_rattle.htm
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Old 07-04-2009, 11:19 PM   #5
TMA
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The car used to be mine... I had Bimmersport install a lightweight flywheel and brand new OEM M3 clutch kit (bearing, pressure plate, and disc)... So theres nothing wrong with any of the parts I know that for sure. Its called "gear rattle" because of the flywheel being so light there is less mass slowing down all the gears that are meshing with each other inside the transmission. That is why when you press the clutch down those gears stop spinning and make no noise. The lighter the flywheel, the louder the gear rattle gets.

There is a solution to quiet down the gear rattle. You have to change the tranny fluid to something thicker I believe, I can't remember exactly what I was recommended to use, but I'm sure someone on here would know. It doesn't completely eliminate the rattle, but it reduces it by more than half.

-Dave
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Old 07-05-2009, 11:01 PM   #6
BmW1819
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input shaft or flywheel
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Old 07-06-2009, 03:12 PM   #7
dejan_da_dude
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Hey dave

The car is running great, pulls harder then ever and im getting hated on by the 240 hahah.

Yea I asked George to put up the thread on the gear chatter, Just to hear some opinions and like u said, maybe changing the tranny fluid to something thicker would help.
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Old 07-06-2009, 03:20 PM   #8
Fel
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I had this happen in my e34 525.... stock clutch and flywheel.

I was told that it was the flywheel rattling... mine had a dual mass flywheel, and it was mentioned that the two pieces over time had come a little bit loose and were making the noise. It doesn't affect drivability, but it does get annoying. (And that's only what I was told, I don't know if this is fact or not).
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Old 07-07-2009, 01:18 PM   #9
dejan_da_dude
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hmm, that would suck if it were true, but then again, my car sounds like a deisel when I idol hahaha
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Old 07-08-2009, 12:25 PM   #10
TMA
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Dejan.... thats not the case with your car. That flywheel is brand new. Its just simply gear rattle caused by the lighweight flywheel. Its annoying I know, but its worth it just to have the ability to rev the engine so quickly for rev-matching.

-Dave
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Old 07-08-2009, 03:56 PM   #11
dejan_da_dude
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Yea, I love that. it scares people how fast it is.

Hope ur having a good one Dave.
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Old 07-14-2009, 12:49 PM   #12
black bnr32
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redline MTF is a common 'thicker' tranny fluid to use to hel with gear rattle. no experience myself, but its well documented on bimmerforums.
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Old 07-14-2009, 01:42 PM   #13
dejan_da_dude
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Nice, I will defenitly give it a look into. Thank you for help guys
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Old 07-16-2009, 12:23 PM   #14
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Its called race car noises, enjoy it!
I have UUC stage 2 and it rattels.
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Old 07-16-2009, 12:45 PM   #15
parm
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Gear rattle, Shut the car off with the clutch engaged and listen, then do the same thing this time without engaging the clutch.
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