[justpete]

Originally Posted by whosdady

You have a 328i right? How much power are you running?

Would you take a pic of how your delrins sit on the subframe brace? Rob's sit 1/4 inch higher than stock.

Rear wheel hp is 219 measured on a DynoDynamic and about 220 or a little more as measured using the accelerometers in the Race Technology DL1Mk3 datalogger.

The pic on the second page with the trailing arm in it and a full view of a Z on a lift in the background shows the aluminum sleeve doesn't sit on the brace and seems to be gapped around a quarter of an inch, or so. Maybe I'm misinterpreting the problem.

[justpete]

Originally Posted by robc1976

it doesn't fully seat on to it, indention isn't deep enough for brace to fully seat inside bushing. It basically bottoms out before flanges on bushing make contact with brace.

FWIW, the more I look at the RealOEM images of the rear axle with suspension and the images of the Delrin bushings it looks to me that the flange shouldn't seat flat on the brace but instead the brace's boss seats on the counterbore surface of the aluminum sleeve's flange only.

[chris82]

Originally Posted by robc1976

you would feel everything in the road. These bushings are for heavily tracked car or higher hp car. For you I would go powerflex purple or black

I think this answers the question as whether the aluminum mounts will introduce any more noise into the car. Taken from: http://articles.sae.org/13330/ in regards to the F80 M3/M4

"That rear subframe bolts directly to the unibody, without the isolation of rubber bushings to introduce vague steering response."

And also, the dampers should be dealing with all the road imperfections anyway. I'm not sure why you would "feel everything in the road" as you still have a suspension back there.

[robc1976]

Originally Posted by Chrisar82

I think this answers the question as whether the aluminum mounts will introduce any more noise into the car. Taken from: http://articles.sae.org/13330/ in regards to the F80 M3/M4

"That rear subframe bolts directly to the unibody, without the isolation of rubber bushings to introduce vague steering response."

And also, the dampers should be dealing with all the road imperfections anyway. I'm not sure why you would "feel everything in the road" as you still have a suspension back there.

depends on mods, but I agree with that...I am running KW clubsports, solid mounts on differential via the lockdown kit so I would assume I Would feel a bit more.

[robc1976]

Originally Posted by justpete

FWIW, the more I look at the RealOEM images of the rear axle with suspension and the images of the Delrin bushings it looks to me that the flange shouldn't seat flat on the brace but instead the brace's boss seats on the counterbore surface of the aluminum sleeve's flange only.

yep, have to agree. Here is a pic (antiseize everywhere lol! )

[chris82]

Originally Posted by robc1976

depends on mods, but I agree with that...I am running KW clubsports, solid mounts on differential via the lockdown kit so I would assume I Would feel a bit more.

I definitely believe you will feel more of the road, but I don't think so much as to make it any less comfortable than it already is

[robc1976]

Originally Posted by Chrisar82

I definitely believe you will feel more of the road, but I don't think so much as to make it any less comfortable than it already is

agreed and hope your 100% right!

[justpete]

Originally Posted by robc1976

yep, have to agree. Here is a pic (antiseize everywhere lol! )

Cool, nice to see it work out. Antiseize everywhere? Nah, just evidence it's not nowhere.

[robc1976]

Originally Posted by justpete

Cool, nice to see it work out. Antiseize everywhere? Nah, just evidence it's not nowhere.

lol! I had to use it!

[robc1976]

I am very glad I chose these, HUGE improvement.

1. I actually feel less v
NVH than yellow powerflex
2. Side to side is completely gone
3. Car tracks straight!
4. Only noise I hear is slight differential whine (hardly hear it.

This is a no brainer mod in my opinion.

[robc1976]

Some pics, used clamps to stop flow of brake fluid top avoid bleeding brakes.

[Stucks]

Originally Posted by robc1976

I am very glad I chose these, HUGE improvement.

1. I actually feel less v
NVH than yellow powerflex
2. Side to side is completely gone
3. Car tracks straight!
4. Only noise I hear is slight differential whine (hardly hear it.

This is a no brainer mod in my opinion.

I'm glad you like them! You got me thinking i should have gone with a stiffer bushing than the powerflex purples lol.

[robc1976]

Originally Posted by Stucks

I'm glad you like them! You got me thinking i should have gone with a stiffer bushing than the powerflex purples lol.

I would do powerflex black minimum after seeing how soft yellow is.

[Stucks]

Originally Posted by robc1976

I would do powerflex black minimum after seeing how soft yellow is.

now thinking about ordering the black 95a bushings.....lol

[robc1976]

Originally Posted by Stucks

now thinking about ordering the black 95a bushings.....lol

lol! Or delrins

[mob17]

Thanks for the advice chaps.

After reading that link a few posts back, about the new M3/M4's subframe literally being fixed to the unibody with no bushings (i think thats what it said), then surely the pure 100% aluminium ones should be good? Or powerflex black as some of you have said.

[Jsoboti]

Learning a lot from this thread and I've decided on Powerflex blacks, I AutoX every months and the side to side on this car causes me to break loose forcing me to slow down more than the M3 guys I'm competing against.

Looking at the ECS website it looks like there is "Rear Subframe Rear Position" and "Rear Subframe Front Position"

Im not exactly which I need, or maybe both. Can someone please explain the difference and what most people do?

Thanks

[Stucks]

Originally Posted by Jsoboti

Learning a lot from this thread and I've decided on Powerflex blacks, I AutoX every months and the side to side on this car causes me to break loose forcing me to slow down more than the M3 guys I'm competing against.

Looking at the ECS website it looks like there is "Rear Subframe Rear Position" and "Rear Subframe Front Position"

Im not exactly which I need, or maybe both. Can someone please explain the difference and what most people do?

Thanks

you will need both. front kit comes with 2, rear kit comes with 2. 4 in total.

[Jsoboti]

Originally Posted by Stucks

you will need both. front kit comes with 2, rear kit comes with 2. 4 in total.

Thanks!

[nitehawk]

@robc1976 are your delrins from Turner?

[robc1976]

Originally Posted by nitehawk

@robc1976 are your delrins from Turner?

Yes

[Stucks]

Originally Posted by robc1976

lol! Or delrins

AKG 95a black bushings ordered.....Damn you Robc1976 lmao selling my pf purples