Lightweight flywheel vibration at idle - Mustang Evolution

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Old 12-10-2015, 01:22 PM   #1
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Lightweight flywheel vibration at idle

In august I installed a GT clutch and flywheel in my v6 and I've driven the car for awhile and sometimes at idle it has this really annoying vibration. If anyone else with a lightweight flywheel has this issue did you find a way to resolve it?

EDIT: I guess you could describe this as a noise/ vibration the car doesn't really shake that bad but you can definitely hear it if your outside the car.
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Old 12-10-2015, 01:37 PM   #2
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There is a reason that Ford used the dual mass flywheel in the Cyclone. 60 degree V6's are inherently imbalanced as you are finding out. I doubt there is a fix except to replace the old flywheel.
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Old 12-10-2015, 01:39 PM   #3
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+1 and a lighter flywheel will make it more apparent. Does it still have the decel vibration?
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Old 12-10-2015, 01:40 PM   #4
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hear and not feel? I wonder if it is the flywheel.......
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Old 12-10-2015, 05:26 PM   #5
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Doesn't have the decel vibrations anymore and I'm really happy with the way the car revs. What i think is happening is theres a small vibration from the engine and its causing something to rattle idk if its the 1/8" piece of metal thats sandwiched between the block and transmission or if its some heat shielding or something somewhere else. Keep in mind it doesn't do this all the time it comes and goes and if i blip the throttle it will stop while its revved up and then sometimes return when it comes back down to idle
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Old 12-11-2015, 08:12 AM   #6
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I had the same thing happen after installing a RAM flywheel. It's backlash chatter in the transmission. Happens mostly as the A/C unit kicks off ( it cycles a lot). I fixed it by upping the idle to 800rpm with my tune. Hope that helps...
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Old 12-11-2015, 08:34 AM   #7
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easy to test by pulling compressor clutch fuse/plug. I like Kona's guess.

a length of 3-4' long hose is helpful as a mechanics stethoscope to try and isolate where it's coming from...w/o insulting check heat shields as simple is common
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Old 12-11-2015, 09:22 AM   #8
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Ill give that a try and now that i think about it if i put the clutch in it'll stop as well so the transmission idea makes sense
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Old 12-11-2015, 11:32 AM   #9
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It's not a guess... hunted that rattle down for months. Up your idle and it's gone.
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Old 12-11-2015, 07:03 PM   #10
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Lightweight fly wheels are notorious for chatter at idle and low rpms.
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