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Is anyone happy with poly/Powerflex diff bushings on their daily driver?
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05-02-2018, 07:34 PM | #1 |
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Is anyone happy with poly/Powerflex diff bushings on their daily driver?
Title says it all, is anyone who uses their car for DD duty happy with poly (like Powerflex purple or black) upgraded diff bushings?
I decided to go with new OEM diff bushings, Powerflex yellow RSFBs and (eventually) a diff lockdown brace because I'm afraid of noise on our crappy roads... but I'm curious about others? |
05-03-2018, 07:43 AM | #2 |
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I have whiteline poly diff bushes and have no complaints. Sure there is a bit of whining going on but nothing excessive. Keep in mind I also have M3 RSFB, poly engine mounts and stiffer trans mounts so there is considerable drivetrain NVH with my entire set up...
Also, using a diff lockdown is like using a solid metal bushing on half of your diff. When your bushings deflect with a lockdown, something that is solid and shouldn't be flexing is flexing. |
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05-15-2018, 07:09 PM | #3 | |
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Blown95ImpalaSS71.50 Jaronbwall284.50 |
05-17-2018, 06:22 AM | #4 |
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My old E46 was polybushed front to rear, running on Eibach springs with 18” alloys.
The ride was hard, you felt every bump. There was also additional vibrations in the cabin when usually the rubber bushes would absorb some of these. |
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Blown95ImpalaSS71.50 |
05-18-2018, 02:48 PM | #6 |
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I have the purple everywhere & not the softer yellow & still love it. Do it & you won't regret it man... ! ;-)
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05-19-2018, 01:21 AM | #7 |
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Drives: E90 M3 LCI Jerez Black
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Location: Herts, UK
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06-01-2018, 02:30 AM | #8 |
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Drives: 2011 335is
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Power flex black in the subframe and diff bushings for me. Along with diff lockdown and upgraded arms. It's definitely a lot more rough than stock but it doesn't bother me at all. Car is mainly driven on crappy canyon roads.
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06-05-2018, 06:47 PM | #9 |
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Im actually considering going other way!! I have purple powerflex bushings and diff lockdown kit (not the bracket one). Also powerflex Black on RSFB. I get sort of a roar noise when I nail it hard at around 40 mph. I disconnected the lockdown to see it would stop nope.
I’m considering going back to OEM M3 front diff bushes and a stock rear one. I drive a tuned 335 diesel with deletes so high torque might be a unique thing for me. I have a Wavetrac LSD as well. All was quiet before the bushes were put in with Wavetrac already installed Last edited by BB_cuda; 06-06-2018 at 07:50 AM.. |
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03-26-2019, 11:20 PM | #10 | |
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03-27-2019, 12:34 PM | #11 |
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Did purples in the diff. No additional noise whatsoever. Very happy with them. Can actually feel the clutch engage now! OEM bushings were soooo shot
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06-25-2023, 08:35 AM | #12 |
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Quick bit to add here: Back in ~2018 I installed poly rear subframe and differential bushings at the same time. The rear end stability improved a lot, but the differential whine on the interstate was infuriating. This week I finally had the poly differential bushings removed from the diff and went back to OEM rubber. I kept the poly RSFB. The rear end still feels great, and the diff whine is totally gone. Hopefully this post saves someone from making my same (labor intensive) mistake.
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2013 E92 328i M-Sport: BSM, 6MT, 3IM+AA Tune, BMW PE, M3 control arms, Eibach Pro-Kit, Bilstein B8, BMW SSK, CDV Delete, Apex EC-7 18x9" |
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10-04-2023, 01:15 PM | #14 |
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I’m in the same boat with a daily driver and trying to decide. So it sounds like rsfb can be a little stuffed like a 95a, but to avoid diff whine go softer with like a pf purple. Can anyone confirm?
This is on e92 n54 6MT 160k miles, fresh bmw PS suspension with stiffer trans mounts and 335is mounts, m3 front arms.
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10-04-2023, 08:33 PM | #15 | |
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I was curious if a softer poly diff bushing might be ok, but this m3 post suggests probably not since they experienced diff whine with powerflex purple: https://www.m3post.com/forums/member.php?userid=148054
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2017 F87 M2: MGM, 6MT, AA Tune, Eibach Pro-Kit, Fabspeed Catted Downpipe, Evolution Racewerks FMIC+Chargepipe, Autosolutions SSK, CDV Delete, Vorshlag Plates, PFC-08 pads, Apex EC-7 18x9.5"
2013 E92 328i M-Sport: BSM, 6MT, 3IM+AA Tune, BMW PE, M3 control arms, Eibach Pro-Kit, Bilstein B8, BMW SSK, CDV Delete, Apex EC-7 18x9" |
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10-05-2023, 07:03 AM | #16 | |
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10-05-2023, 04:45 PM | #17 | |
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2017 F87 M2: MGM, 6MT, AA Tune, Eibach Pro-Kit, Fabspeed Catted Downpipe, Evolution Racewerks FMIC+Chargepipe, Autosolutions SSK, CDV Delete, Vorshlag Plates, PFC-08 pads, Apex EC-7 18x9.5"
2013 E92 328i M-Sport: BSM, 6MT, 3IM+AA Tune, BMW PE, M3 control arms, Eibach Pro-Kit, Bilstein B8, BMW SSK, CDV Delete, Apex EC-7 18x9" |
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10-23-2023, 07:48 PM | #18 |
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I wrote back in 2018. My roar noise has disappeared. I do still hear diff whine but not too bad.
I am thoroughly enjoying the Wavetrac with the other mods. Still running the Powerflex purples on diff and the diff brace from the seller in Chicago. I’ll remember his name (on N54performance). |
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