Discussion in 'General maintenance, upgrades and modifications' started by Ticker, Jul 31, 2019.
Anyone know where I can buy an upgrade poly bushes for me diff
Not recommended unless it’s a dedicated race / track car.
klan explain why ??
General consensus is that they will clunk too much on a road car. Better off with new bushings (the entire rear cover) from BMW, and the revised bolts.
Get OEM, when you get the part, you will see its a proper solid bit of kit anyway - I see no need to use a poly bush.
OEM diff bushes were the recommendation to me too, and it made a massive difference replacing mine after 57,000 miles.
OEM is best for road car, poly are noisy as hell.
I have high quality AKG poly for my track car. Stay away from powerflex. I had one fail with only 2000 miles.
Poly diff mounts transmit huge amounts of noise, more than any other bush replacement on the car.
Unless you are ok with that, don't do it.
As above, stock to oem!!
I have upgraded my e46 to polybushes and couldnt tell the difference in noise. That was sub frame and diff.
I used poly bushes on my E46 for diff and subframe, and you could tell in the cabin. A bit more noise and vibration.
admittedly my e36 is fully stripped, but once changed i honestly thought the diff had failed though admittedly its a very very hard bushing so i dare say a softer one wont be as bad.
I polybushed my diff when I had my RACP done. I went for poweflex purple ones and it has made absolutely zero difference to sound/clunck/noise or anything.
If you went for the black race series I would expect that to be too firm for day to day use. They have a lifetime guarantee so go for it.
I got mine through Ben @ Hack engineering.
The noise from my diff is very bad due to 95a diff and subframe poly bushes and a mason engineering rear brace. The mason brace transmits the more vibration/whine into the rear strut towers which amplifies the noise.
Dude, mine is a track car, they are as hard as hard gets, way way harder than the powerflex offerings. howver I need to put this into context. when my gearbox mounts failed I bought a load of solid nylon rod, drilled through it and bolted the straight through it. I noticed a significant change in gear selection accuracy and virtually no difference in noise.
When I changed the diff bushes, I noticed absolutely no improvement in any respect (these have been in for two years) and a very significant increase in noise. I do not see its worth the bother to be honest.
I only did mine as was having the RACP plated so changed them only because while it's off it made sense and also made sense as they have life time guarantee that was the only reason. Most of the rest of the car has been done since and the only one I can say actually felt different was the lolly pop ones which made the front end much sharper.