Are Current OE Rear Subframe Bushings Improved?

[old///MFanatic]

Raised refers to the subframe going up higher (closer to body), back to stock height even though you have plates.
Doing this puts you back in stock camber adjustment range (with stock chopsticks)

Oh well if they machine them shorter and have less material on top that would certainly make sense. Geez it’s so basic I’m embarrassed didn’t catch on. I did wonder why someone would want it lifted/raised. If listed as being made shorter then would have known.

But didn’t Slideways show photos in post #20 how the recessed cup at the top on solid mounts where it would connect to the hex of the stud was no longer there in latest production for “raised”? And even appear to show a raised protruding aluminum center? In his photo the back two show their tops. These don’t have the recessed section for where (front) makes contact to the subframe stud hex nut.
*edit* Suppose they can still make top hat area shorter and protruding center shorter than original unit height.

[oceansize]

One more thing I forgot to ask about the solid raising bushings (slightly raising the subframe), is there any concern with the driveshaft angle relative to the diff? Hopefully, that will not impact the service life of the driveshaft, CSB, diff or diff bushings.

Just ask Cayn AussieE46M3 , he is really good dude within the community and always responds with detailed answers. Obioban just installed the CMP subframe bushings on his car and we all know he isn't one to put something wonky on his vehicles.

[r4dr]

Raised refers to the subframe going up higher (closer to body), back to stock height even though you have plates.

Doing this puts you back in stock camber adjustment range (with stock chopsticks)

This is what I've been trying to say... feel like I'm taking crazy pills over here.

[heinzboehmer]

Wouldn't raising the subframe put it back in the position it was from the factory?

If the reinforcement plates push the subframe down by the thickness of the plates, and the bushings raise it back up to correct for the plates...

From personal experience, the CMP bushings bring the subframe up more than what plates push it down. Not sure how much more, but with stock everything (except CMP subframe bushings), I couldn't get my rear camber to go past -0.5 deg.

[oceansize]

From personal experience, the CMP bushings bring the subframe up more than what plates push it down. Not sure how much more, but with stock everything (except CMP subframe bushings), I couldn't get my rear camber to go past -0.5 deg.

If you weren't lowered then this is the expected outcome. From CMP:

If the car is still at factory ride height, the resulting change in camber geometry limits negative camber adjustment to less than ideal for sporty driving. We'd like to imagine that if you've purchased these subframe bushes this likely isn't your first suspension modification however, if your car is still are factory ride height, adjustable camber arms are required to dial in more negative camber.

[Slideways]

Just ask Cayn AussieE46M3 , he is really good dude within the community and always responds with detailed answers. Obioban just installed the CMP subframe bushings on his car and we all know he isn't one to put something wonky on his vehicles.

Yup, I emailed him and he already replied:

"Yes it does effect the angle of both the prop shaft and the axles however, in a positive way. The prop shaft originally dips down to the diff however, bringing it up straightens things reducing misalignment and taking some of the ‘wub’ out of the UJ in the prop for a theoretically longer life.

Same goes for the axles. When you lower a car they can be angled fairly aggressively up and this helps straighten them there too."

[heinzboehmer]

If you weren't lowered then this is the expected outcome. From CMP:

If the car is still at factory ride height, the resulting change in camber geometry limits negative camber adjustment to less than ideal for sporty driving. We'd like to imagine that if you've purchased these subframe bushes this likely isn't your first suspension modification however, if your car is still are factory ride height, adjustable camber arms are required to dial in more negative camber.

Yup, I was expecting it to be somewhat off. Car is now (moderately) lowered and rear camber maxed out at -1.3 deg.

I do see some camber arms in my future though.

[0-60motorsports]

I installed CMP soilds and its a beautiful product. Everything else i have is stock minus GC coilovers. The ride has become horrendously Hard, turned the shocks to full soft and still harsh AF. Spring rates are 440/550.

Now i dont know if this is related to the CMP bushes or spring rates being too stiff....sugestions?

[Obioban]

I installed CMP soilds and its a beautiful product. Everything else i have is stock minus GC coilovers. The ride has become horrendously Hard, turned the shocks to full soft and still harsh AF. Spring rates are 440/550.

Now i dont know if this is related to the CMP bushes or spring rates being too stiff....sugestions?

Subframe bushings should not be able to effect ride quality in any meaningful way. The spring rates aren't what I'd choose, but they shouldn't be back breaking, either. I'd suspect you have a frozen shock or insufficient travel or something binding.

[oceansize]

I installed CMP soilds and its a beautiful product. Everything else i have is stock minus GC coilovers. The ride has become horrendously Hard, turned the shocks to full soft and still harsh AF. Spring rates are 440/550.

Now i dont know if this is related to the CMP bushes or spring rates being too stiff....sugestions?

There is no way your subframe bushings caused this. I'm on GC with stiffer springs than you and CMP solid RTABs and subframe bushings that were installed post suspension upgrades and there was no significant change in the general "comfort" level of the car. The car is tighter and more "responsive" for lack of a better word but comfort level hasn't changed.

I saw your previous thread where you were discussing the GC coilovers: https://nam3forum.com/forums/forum/m...oilover-choice

You really seemed to love whatever you had on before the GC so why don't you buy what you had before?

[0-60motorsports]

There is no way your subframe bushings caused this. I'm on GC with stiffer springs than you and CMP solid RTABs and subframe bushings that were installed post suspension upgrades and there was no significant change in the general "comfort" level of the car. The car is tighter and more "responsive" for lack of a better word but comfort level hasn't changed.

I saw your previous thread where you were discussing the GC coilovers: https://nam3forum.com/forums/forum/m...oilover-choice

You really seemed to love whatever you had on before the GC so why don't you buy what you had before?

Well I can guarantee you then IT IS the suspension. To answer your question about getting DA's again I am not willing to spend 2k on shocks and shipping all the way from Cali to Bahrain. Less than 2k i get PSS10s which have all parts easily available on the market without this rebuild drama with GC and TCK. The rear shocks I paid for brand new ones, then shipped old ones back and they refunded me after 6 months. So not worth it and I think 7-10 years of GC, it worked great until it needed replacements (oh by the way they didnt have any in stock LOL, hence me switching to SAs otherwise my car would have been stuck on a lift for 2-3 months).

[Tbonem3]

Ya get some PSS10s Ejaz and call it a day. Esp if you have sway bars (they help with soft first portion of progressive springs' travel)

[0-60motorsports]

Ya get some PSS10s Ejaz and call it a day. Esp if you have sway bars (they help with soft first portion of progressive springs' travel.

Yes Sir, Just waiting for end of May beginning of june to order from germany. Thanks

[old///MFanatic]

Well doesn’t appear anyone has info either way on if the Genuine BMW M mounts are now firmer or improved.

Also have not heard anyone state new M mounts aren’t good at this location.

[SteelGreyM]

I have CMP solid subframe bushings.

I also installed the CMP rtabs.

So much happier with the end result. Ride is firmer (Rtab only to blame here) but so much smoother? Not sure how to describe it. More controlled and less harsh. Just feels F’ing good!

The subframe bushings don’t change anything in NVH. It’s just not possible. Just think about how it’s all bolted up...