MRF solid aluminum subframe bushings

[schnell325]

Originally Posted by whats77inaname

If you want a set of brand new, never used TMS Delrins, hit me up, as I'm going to be headed down the poly route.

Thanks for the offer, but I've already purchased them.

[whats77inaname]

Originally Posted by schnell325

Thanks for the offer, but I've already purchased them.

Very good, sir, very good

[wuzupfoo]

Another happy MRF customer here with the subframe mounts and delrin diff mounts.

yes there is a whine and its only really noticeable because of the higher frequency with a radio on its in the background and its barely perceptible and it really doesn't annoy me. I think though this is a real subjective issue.

As everyone else reports the rear end is planted.. its like driving another car when under heavy acceleration and shifting. I really cant wait to see how this feels on the track. I thought when I got coilovers about 5000 miles ago that it was an awesome addition, in my mind so far this matches it at least and if my driving skills were better I think it would surpass it as far as how predictable and confidence inspiring the rear end feels now.

Malek is the man and if you are on the fence on this, I say go for it.

[Someone?]

Originally Posted by wuzupfoo

Another happy MRF customer here with the subframe mounts and delrin diff mounts.

yes there is a whine and its only really noticeable because of the higher frequency with a radio on its in the background and its barely perceptible and it really doesn't annoy me. I think though this is a real subjective issue.

As everyone else reports the rear end is planted.. its like driving another car when under heavy acceleration and shifting. I really cant wait to see how this feels on the track. I thought when I got coilovers about 5000 miles ago that it was an awesome addition, in my mind so far this matches it at least and if my driving skills were better I think it would surpass it as far as how predictable and confidence inspiring the rear end feels now.

Malek is the man and if you are on the fence on this, I say go for it.

Sweet! now i wish we could get ah god dam report on Solid subs and Powerflex diffs so We(the whole site) could know if the Powerflex diffs eliminate the whine.

[Longbow64]

I think you're going to get a little more whine no matter which bushings you use if you want a stiffer option. You could always just replace your OEM ones with new ones. I'm still 1000 hours out from when I can give you a fair assessment.

[Someone?]

Originally Posted by Longbow64

I think you're going to get a little more whine no matter which bushings you use if you want a stiffer option. You could always just replace your OEM ones with new ones. I'm still 1000 hours out from when I can give you a fair assessment.

Sorry i was wondering about Mikes initial thoughts on his Poly differential bushings, and if they didnt whine very much(im hoping).
But i want to order all my bushings so thats why i would like to know someone who has done the solid/Poly combo opinion.

[Malek@MRF]

Originally Posted by ibmike

Sorry i was wondering about Mikes initial thoughts on his Poly differential bushings, and if they didnt whine very much(im hoping).
But i want to order all my bushings so thats why i would like to know someone who has done the solid/Poly combo opinion.

I just finished Mike Benvo's E90 M3 last week before Bimmerfest with the MRF subframe bushings + the purple Powerflex differential bushings. The Powerflex units STILL whine as I suspected, and I will stick to my original recommendation that if the upgrade is being done, use the Turner Delrin units. Of the 4 cars that got this sub-set of modifications here last week, the Powerflex didn't offer much noise dampening qualities over the delrin or the solid units.

I opted for solid diff mounts on my personal car with a Delrin rear bushing, as I have discussed before that having a solid bushing on the rear carrier mount is a big no-no and will add a lot of stress to the differential housing which is a much softer aluminum and it will break either with time or with excessive drive-train shock.

[whats77inaname]

Originally Posted by Malek@MRF

The Powerflex units STILL whine as I suspected, and I will stick to my original recommendation that if the upgrade is being done, use the Turner Delrin units. Of the 4 cars that got this sub-set of modifications here last week, the Powerflex didn't offer much noise dampening qualities over the delrin or the solid units.

Good info to know. Guess I'll go ahead and keep the delrin units instead of selling them.

[Hujan]

Thanks for the info, Malek. Interesting that the Powerflex did not alter the sound much. I vaguely recall you mentioning before that fluid made a difference, but it sounds (pun intended) like we're probably going to have to live with the whine.

On a related topic, do you recommend upgrades to any of the other suspension bushings in order to maintain balance on a car that has the solid subframe and solid/Delrin differential bushings? I know that Powerflex sells poly bushings for pretty much every bushing under the car. That's probably overkill but at the same time, in my limited experience, I find that when you reinforce one area you sometimes amplify weaknesses elsewhere.

[hgmotorsports]

I'll be getting these shortly Malek. :thump:

-Mike

[aussiem3]

Originally Posted by Hujan

Thanks for the info, Malek. Interesting that the Powerflex did not alter the sound much. I vaguely recall you mentioning before that fluid made a difference, but it sounds (pun intended) like we're probably going to have to live with the whine.

On a related topic, do you recommend upgrades to any of the other suspension bushings in order to maintain balance on a car that has the solid subframe and solid/Delrin differential bushings? I know that Powerflex sells poly bushings for pretty much every bushing under the car. That's probably overkill but at the same time, in my limited experience, I find that when you reinforce one area you sometimes amplify weaknesses elsewhere.

+1 ... much appreciated.

[RCKehrer]

I had the MRF sub frame bushings installed and the turner dif bushings....The important part of this post is that I fell they fix all the issues with the rear end...wheel hop, float, etc...

However, it is a sales tool for harrop because you car does sound like it has a screw compressor on it.

[whats77inaname]

Getting mine done on Tuesday....sounds like your music isn't loud enough

[Hujan]

Originally Posted by RCKehrer

I had the MRF sub frame bushings installed and the turner dif bushings....The important part of this post is that I feel they fix all the issues with the rear end...wheel hop, float, etc...

However, it is a sales tool for harrop because you car does sound like it has a screw compressor on it.

You mean like at 0:20 in this vid? If so, I kinda dig that.

[lsmkr01]

Originally Posted by RCKehrer

I had the MRF sub frame bushings installed and the turner dif bushings....The important part of this post is that I fell they fix all the issues with the rear end...wheel hop, float, etc...

However, it is a sales tool for harrop because you car does sound like it has a screw compressor on it.

I was thiking the same thing when I first heard the harrop video. Sounds reminiscent of the Mclaren F1 GTR with its uncut gears. Sound clips of that car give me goosebumps!

[whats77inaname]

Finally got them in. I drove to Houston to have ABR do the install. After spending 3 hrs in the car driving it home, I can say that this is money well spent. The rear end feels leaps and bounds better. Before, during hard acceleration, I could feel the car have a slight swaying motion from the rear as it struggled for traction. Although the traction light never comes on, the movement is definitely noticeable. After the install, that slop is gone. Acceleration comes with no lateral movement out back.

As for the whine that everyone seems to have issue with, it's nowhere near as bad as advertised, at least not for me. I was anticipating I was going to hear something that I would possibly grow to resent, but that's not the case. I have a stock exhaust right now, and with the stereo on, most of the time I didn't hear it. When you mash the accelerator down, you can hear the diff, but it reminds me of a s/c'er on low, low volume. When cruising @ a 75-90mph clip, it was *faintly* audible.

I'll GoPro a video over the next few days.

[W///]

Originally Posted by whats77inaname

Finally got them in. I drove to Houston to have APR do the install. After spending 3 hrs in the car driving it home, I can say that this is money well spent. The rear end feels leaps and bounds better. Before, during hard acceleration, I could feel the car have a slight swaying motion from the rear as it struggled for traction. Although the traction light never comes on, the movement is definitely noticeable. After the install, that slop is gone. Acceleration comes with no lateral movement out back.

As for the whine that everyone seems to have issue with, it's nowhere near as bad as advertised, at least not for me. I was anticipating I was going to hear something that I would possibly grow to resent, but that's not the case. I have a stock exhaust right now, and with the stereo on, most of the time I didn't hear it. When you mash the accelerator down, you can hear the diff, but it reminds me of a s/c'er on low, low volume. When cruising @ a 75-90mph clip, it was *faintly* audible.

I'll GoPro a video over the next few days.

Great feedback. I'll be looking to do this in the future for sure.

[Hujan]

Originally Posted by whats77inaname

Finally got them in. I drove to Houston to have ABR do the install. After spending 3 hrs in the car driving it home, I can say that this is money well spent. The rear end feels leaps and bounds better. Before, during hard acceleration, I could feel the car have a slight swaying motion from the rear as it struggled for traction. Although the traction light never comes on, the movement is definitely noticeable. After the install, that slop is gone. Acceleration comes with no lateral movement out back.

As for the whine that everyone seems to have issue with, it's nowhere near as bad as advertised, at least not for me. I was anticipating I was going to hear something that I would possibly grow to resent, but that's not the case. I have a stock exhaust right now, and with the stereo on, most of the time I didn't hear it. When you mash the accelerator down, you can hear the diff, but it reminds me of a s/c'er on low, low volume. When cruising @ a 75-90mph clip, it was *faintly* audible.

I'll GoPro a video over the next few days.

Thanks for the review.

[lsmkr01]

Originally Posted by W///

I'll be looking to do this in the future for sure.

I'm tempted to go ahead and pick up the parts just so it pushes me to get this done soon and not keep pushing it back. Below are the shops I was looking at that I believe are more than qualified to do it right.

Carolina Dyno in Wilmington, NC
European Road Racing in Charleston, SC
GMP in Charlotte, NC

[whats77inaname]

Originally Posted by lsmkr01

I'm tempted to go ahead and pick up the parts just so it pushes me to get this done soon and not keep pushing it back. Below are the shops I was looking at that I believe are more than qualified to do it right.

Carolina Dyno in Wilmington, NC
European Road Racing in Charleston, SC
GMP in Charlotte, NC

You will not be disappointed in the results, I can attest to that.

[lsmkr01]

Originally Posted by whats77inaname

You will not be disappointed in the results, I can attest to that.

How many hrs did you shop log for the job? Im pretty sure at this point its my next mod so just shopping around for the right place to do the work thats at a fair price. Usually I DIY everything.

[OM VT3]

I've got MRF subframe bushes and turner diff does anyone's car make clunking sound when you let off the gas sometimes?