RS Clutch + LWF noise ?
04-25-2018, 01:18 PM
#46
Instructor
Can you be a bit more specific? What oil, and in what quantities? Are you just speculating or you've actually seen this have an effect?
04-25-2018, 01:41 PM
#47
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My mechanic had something that he said would help. I don't recall which oil it was but it made a noticeable difference. Maybe it was Swepco? Conjecture. I don't actually recall. But it did help some.
04-26-2018, 07:48 PM
#50
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Unless there’s an actual mechanical issue, which is not a normal operating sound, the sound you call noise, isn’t. Maybe get something with more isolation, and/or a touring feel? Regarding fluid, I use Delvac, and it’s more “vocal” and needs more “encouragement” when cold. After it warms, it smooths out, and quiets down a tad.
04-28-2018, 08:43 PM
#51
Rennlist Member
I saw one of my old posts back in 2012 commenting on the LWF noise with 145K. Well I can report after a trans rebuild and the same flywheel, now with a GT3 PP and disk, it's much quieter. I can still here it at idle, but it not that noticeable. With a sample size of one, I can say wear and tear does make difference on how noisy a LWF can be.
04-29-2018, 10:50 AM
#52
RL Community Team
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01-29-2019, 03:54 PM
#53
Instructor
At idle in neutral, I’ve learned to hear the gearbox rattle in my ‘85 3.2 and in my 2018 991.2.
02-02-2019, 06:34 PM
#54
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The noise is caused by backlash in the non-engaged gears being shaken by the torque impulses of the engine at low rpm. It's totally normal and does no harm whatsoever, however if you don't like the noise because you drive around in 4th gear at 30mph all the time, then clearly the LWF package is not for you. This is why Porsche deemed the LWF suitable for the RS Clubsport only and an option on the 993 RS lightweight. If you wanna go faster there is always a price to pay somewhere along the line.
02-04-2019, 09:34 PM
#55
Drifting
It's just the unselected gears rattling on their shafts as 9M said
40lbs of flywheel makes the transmitted torque pulses smaller.
the gear rattle is transmitted to the cabin thru the tranny mount.
I don't think damping the trans tunnel would do much as you still have the rest of the F,R L & R floors vibrating
oil isn't really an option as it has to do a different job - lube your gears
rebuilding the trans with tighter tolerance and sticking with stock tranny mount is probably best you can do
40lbs of flywheel makes the transmitted torque pulses smaller.
the gear rattle is transmitted to the cabin thru the tranny mount.
I don't think damping the trans tunnel would do much as you still have the rest of the F,R L & R floors vibrating
oil isn't really an option as it has to do a different job - lube your gears
rebuilding the trans with tighter tolerance and sticking with stock tranny mount is probably best you can do
