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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Do the flywheel needs replacement?



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      09-24-2014, 05:17 AM   #1
chiefsotos
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Do the flywheel needs replacement?

Hello, at 30.000kms i changed the oem clutch in my bmw 335 fbo.
I put an organic act and combined with short shift uuc. I haven't asked my mechanic for the flywheel condition when i put the new act on.
After that i had a little vibration in my hand when i hold the gear level, but thought it was normal.
After 35.000kms my act sleeping a lot, so now i wonder if it has been damaged the flywheel also. Is it a way to figure it out before i take off the clutch? Do vibration in the gear level means flywheel failure?
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      09-24-2014, 08:10 AM   #2
Ovitrix335
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You should've resurfaced the flywheel when you installed the new act clutch or get a brand new flywheel. I had an act clutch before and it didn't hold to good. I went with a spec stg3+ and steel fw and so far is good. I don't know why you have the vibration with the oem fw, i never had any lever vibration with the oem fw, maybe your flywheel is coming apart.
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      09-24-2014, 08:16 AM   #3
chiefsotos
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Do you notice any difference of going from dmfw to ssfw?
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      09-24-2014, 08:23 AM   #4
stanlalee
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You might be able to get away with just a resurface at that mileage but a general rule of thumb is dual mass flywheels should be replaced when the clutch is replaced. The inner parts (springs) wear.
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      09-24-2014, 08:29 AM   #5
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The smfw chatters at idle especially with the ac on but it is better for higher power applications. I have 25k miles on my setup so far and i can say the spec never let me down. If this fails i'll try the PTF twin disc setup. If you have to change your clutch and fw you should look into ptf twin disc, it is a bit more than spec stg3+ but it has an oem feel. It all depends what your power goals are.
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      09-24-2014, 09:03 AM   #6
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You should always resurface, it will cause a slight vibration or chatter at shifts. Nothing bad is just the mating areas are worn differently
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      09-24-2014, 01:17 PM   #7
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I asked several mechanics about reusing the stock dual mass flywheel when changing clutches and the consensus was that you can reuse it once but not twice.....that being said I changed mine out with new when I installed the 335is clutch upgrade just to be on the safe side.....my original dmfw looked pretty good with 44k miles on it, mainly just discolored a bit probably from my original clutch starting to slip some.....

and good to see a 335i in Greece, that car must have cost a fortune over there with the engine size taxes.........
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      09-25-2014, 03:30 AM   #8
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you are right about the cost of buying it and use it.
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