Discussion in 'Engine maintenance, upgrades and modifications' started by Ticker, Jul 31, 2019.
Be careful what you get. I would stick with OEM or go powerflex yellow at most. I had some black series fitted in my old one and it clunked its ******** off, plus uprated OEM bolts would not fit any more so it couldn't be rectified.
I upgraded to power flex road series (yellow) when I did my RACP no difference really, only benefits I was interested in is the lifetime guarantee.
As above I’d stay away from the race series (black) on the diff as I think that would be too harsh for everyday/road use
I upgraded to Power Flex road also when doing the subframe reinforcement just got them through eBay pal!
Go with OE bushes.
Aftermarket poly bushes will increase NVH.
Only annoying thing with replacing with OE is that you cannot order the rear bushes by themselves, they are supplied with the cover plate which isn’t exactly cheap.
Not true Robba I’ve poly bushed most of my car with zero increase in NVH etc if you go for power flex race series (black) then probably would notice some vibration/road noise but with the std ones it’s not an issue.
Mate, I told Redish I wanted Powerflex diff bushes and subframe bushes for my boot floor job and he told me to use Powerflex Yellow on the subframe and OE bushes on the diff due to the poly bushes increasing NVH, which is not ideal for a road car.
Not to mention there are numerous threads on M3forum which confirm the above.
But if you’re happy with your set up that’s all that matters!
I’ve got yellow/purple all round the car buddy and as I said no difference in noise. Got them on my subframe/diff/ front & rear ARB’s/RTAB/ front lolly pops/suspension front & rear. Etc
Mines a daily use road car if I’m honest the only ones I even noticed that made a difference to the car was the lolly pops and that was on the steering response
I've got powerflex yellow. Installed when the diff was refurbed. The rear floor was reinforced at the same time. There is some noise transfer from the diff to the chassis now. I guess the combo of poly bushes and the rear floor being much stiffer that allows more noise to be transferred. It's not so loud. And the M clunk was ellimated.
Powerflex is OK, but I've found SuperPro (also SuperFlex for us UK folk; they make some bushes themselves via R&D and supply rebranded SuperPro bushes) to be a pretty decent bush. They have a minimal increase in NVH.
I had that when I did my RACP.
I had a slight increase in NVH. The buzzing increased in some regions yet went down at motorway speeds. However, it became a much nicer car to drive. Gear changes were much better, throttle response improved loads, and the car lost the twitch it had. It was way way nicer to drive.
I got custom ones made for my E46, but they transmitted extra NVH into the cabin.