E36m3 transmission whine loud

[NLZN]

Hi there.
I recently did a refresh. Replaced all bushings on car with poly, removed crappy sound barriers, installed poly mounts, DS csb etc you name it I did it.
Transmission specific I installed a gripforce single mass flywheel, Sachs clutch, Tob and pilot bearing. Replaced Tob slide tube and pivot ball. Added evo3 short shifter.
The transmission whines loudly now. Please see attached youtube link. Has me worried pretty good. Fluid was changed with redline d4 ATF.
https://youtu.be/P5CvginXbb0

Thanks!

[PITT M3 RR]

Sounds like poly bushing NVH from Trans / diff. What bushings did you do and what durometer?

[NLZN]

uuc red racing tranny mounts w/ cups, uuc red motor mounts, powerflex black (95a?) Rear end all bushings and akg red (75d) rear subframe

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[bmwdirtracer]

Well, um, you removed all the rubber and sound deadening items from your street car, and put in a bunch of rock hard racing stuff and a one-piece flywheel, too. BMW put that rubber stuff in there because it's much quieter than race stuff.

Reline's MTL will reduce the whine a bit. Redline MT-90 is quieter still, but may be harder to shift, stone cold.

[PITT M3 RR]

Yea your install is fine. It's the NVH. Enjoy your race car! feel*

[328 Power 04]

Ya, I had to remove my polyurethane because I wouldn't want it to sound like that all day long.

[shadowpuck]

yup, agreed with the others. bmw, and other manufacturers - spend millions of dollars and thousands of hours chasing down NVH. check out the book about the development of the C5 Corvette and how much time they spent on NVH. by the way, their benchmark? A BMW M5....

so, yeah, that's the tradeoff here. perhaps i'm getting older, but when i re-did my ZHP recently i went with mostly stock bushings and only poly in a few spots.

all that said, your car seems to rev freely and has a nice sound (beyond the whine). of course, if this is a track car then i think you'll be very happy on track!

[MIKYZZ4]

For some reason, to me anyway, the whine seems to give it the direct, mechanical purr, that a properly prepped track car should have.
I prefer a more full bodied whine:https://www.youtube.com/watch?v=5AFztHfJMmk.
Maybe you over-modded and should replace what you called-crappy sound barriers?
Whine is best served with a complementing exhaust tone, or growl!!

[bmwdirtracer]

Well, I don't know about "replacing the crappy sound barriers", if he's talking about that insulation that turns into orange powder the moment you touch it...... (Everyone who has worked on an E36 transmission knows the stuff. ) I don't think there's any putting it back....

[MIKYZZ4]

Hi Chris, I don't really know what sound barriers he was referring to, just being sarcastic.
The reason being that, all components were replaced without regard to NVH, and now there is concern?
It sounds fine, as a race prepped track car, maybe not so much as a DD, for him. The sound doesn't seem to bother me much.

[NLZN]

Well, I don't know about "replacing the crappy sound barriers", if he's talking about that insulation that turns into orange powder the moment you touch it...... (Everyone who has worked on an E36 transmission knows the stuff. ) I don't think there's any putting it back....

^ This. I did line the transmission tunnel with DEI Heat Barrier to try and help for the summer on the pad.

To be clear the sound doesn't bother me (I personally like it) and there is absolutely no concern for NVH here, just worried I messed up somewhere with the sudden sound of a straight cut gearbox.

[bmwdirtracer]

Yeah, to both your worry, and to all the replies of the very erudite guys who have answered here. I agree, the Muncie M22 noise seems a bit excessive, but, well, you didn't do anything inside the gearbox, other than fluid.

I will mention that my M5 makes lots of noise, at idle, clutch pedal up, after installing the 13 pound flywheel instead of the 40 pound dual-mass. However, gear whine has not increased....but I didn't remove any sound insulation, either. Did you do diff fluid, too? Might want to recheck fluid levels in gearbox and diff, and maybe try MTL or MT90. (MTL is very popular for your box, MT90 is a little thicker, popular for different, generally older BMW gearboxes.)

[NLZN]

Oh there's chatter and whatever else going on too. Didn't really worry me as much as the supercharger that got added. I did change the diff, redline 75w90. I have some mt90, I can try and top off the tranny with it. Ok to mix with d4atf?
As far as the fluid levels go I just kept pumping until it started coming out of the fill holes.

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[bmwdirtracer]

It'll mix just fine. There are several well known entities that swear by a cocktail of MTL and D4; if I recall correctly, UUC is one.

[shadowpuck]

yup, one of my buddies uses that mix in his track car as it calmed down some of the noise and such....