Subframe and differential bushings

[Lucrecio84]

I have an appointment on Monday to drop my car off at MRF to get the differential and subframe bushings done. Does anyone have these switched out yet? Thoughts?

Update: Picked up my car yesterday from MRF. Ended up doing diff and subframe bushings. All I can say is it was totally worth it. Car responds and just feels noticeably better. Taking corners and acceleration are a huge difference. The whine is definitely there but something I think I'll get used to. With the windows down or music on, it can't be heard. I want to thank Malek for the work, he did an amazing job. Not only is he extremely knowledgable but I loved how neat and clean his shop is. Will definitely use his services in the future! Anyone contemplating this modification should definitely get on this, you will not be disappointed!

[JEllis]

Lots of us do. I had mine done at MRF.

[Lucrecio84]

Originally Posted by JEllis

Lots of us do. I had mine done at MRF.

how do you like it? did you notice a difference? if so, what did you notice?

[JEllis]

http://www.m3post.com/forums/showthread.php?t=926758

[81bear]

Yes... Mrf subframe bushings an Derlin diff bushings.

Car's rear end feels more planted and it eliminates wheel hop which was the main reason I had them changed. Now when I change gears at 8000+ rpm the car lunges forward as opposed to hoping or braking traction.

Only negative is added noise in the cabin. It's loud so be prepared. I've been told that most, if not all, the added noise is from the diff bushings so keep that in mind before you install them.

If I were to do it again I'd probably just do the subframe bushings and see how they perform before doing the diff bushings.

Overall, I'm very happy with the performance just wish they weren't so loud...

[whats77inaname]

Originally Posted by Lucrecio84

how do you like it? did you notice a difference? if so, what did you notice?

http://www.m3post.com/forums/showthread.php?t=997155&

Slop in the rear is eliminated, def. feels more planted and gives you the confidence to push it a little bit more around corners. I hardly even notice the (to me) barely perceptible noise anymore. If you have an aftermarket exhaust, it drowns it out, anyway.

[JEllis]

Originally Posted by whats77inaname

I hardly even notice the (to me) barely perceptible noise anymore. If you have an aftermarket exhaust, it drowns it out, anyway.

This

[Lucrecio84]

Originally Posted by JEllis

http://www.m3post.com/forums/showthread.php?t=926758

nice write up! much appreciated

[Lucrecio84]

Originally Posted by whats77inaname

http://www.m3post.com/forums/showthread.php?t=997155&

Slop in the rear is eliminated, def. feels more planted and gives you the confidence to push it a little bit more around corners. I hardly even notice the (to me) barely perceptible noise anymore. If you have an aftermarket exhaust, it drowns it out, anyway.

Thanks for the input! I'm supercharged with GT4 exhaust system so noise doesn't really bother me, sounds kinda cool actually

[Longboarder]

Originally Posted by Lucrecio84

Thanks for the input! I'm supercharged with GT4 exhaust system so noise doesn't really bother me, sounds kinda cool actually

There's an additional bushing that Malek can install that may actually significantly temper the sounds from going with solid diff mounts. Ask him to show you when you drop your car off.

I'm def doing the subframe mounts soon but the noise from the diff mounts turned me off so I was just going to do the subframes. But with this potential solution to quiet down the noise from the diff mounts, I may do that as well.

[squartus]

Yep have the solid derlin diff bushings, huge difference in how the car is planted/traction as well as gets rid of wheel hop.
As stated it causes some pretty loud whine noise in the cabin, even with windows down and loud exhaust and supercharger you can still hear it until you hit around 70-80 mph then it tapers off. Iv had mine is for maybe 1 1/2 years now and does not bother me much unless windows are up then... its like deep inside your ear in certain gear/speed.

First thing everyone always asks when they get in car is WTF is that sound??
Know one of the companys are working on a isolator kit that may limit/remove the noise but we will see.

[Jive]

How many hours of work would a typical shop take installing diff and subframe bushings?

[Hujan]

I have the MRF solid aluminum subframe bushings and delrin differential mounts. All the work was done by MRF.

I echo everyone's comments: Car feels amazing and it inspires a tremendous amount of confidence in the rear end.

Only downside is the diff whine. I've been told its more pronounced on the DCT cars than the 6MT cars, which seems to be consistent with what I've seen. The 6MT guys seem to be the ones saying it's a nonissue and easily drowned out, whereas the DCT guys seem to be the ones hearing it the most. It's really only an issue for me at steady-state cruising above 65 mph.

[ashtaron14]

I have had Solid Aluminum Subframe Mounts and Powerflex Purple Diff Bushings for about 5 months now.

Since my car was supercharged, when I am cruising and then I apply full throttle, the rear would strut down prior to launch. The solid mounts minimized that delay. There's not much diff whine since I didn't do the solid diff mounts. The whine of the Supercharger definitely covers the whine of that.

[Hujan]

Originally Posted by ashtaron14

I have had Solid Aluminum Subframe Mounts and Powerflex Purple Diff Bushings for about 5 months now.

Since my car was supercharged, when I am cruising and then I apply full throttle, the rear would strut down prior to launch. The solid mounts minimized that delay. There's not much diff whine since I didn't do the solid diff mounts. The whine of the Supercharger definitely covers the whine of that.

Yes, I've heard the purple PowerFlex diff bushings are much quieter than the delrin units. Obviously, you give up some performance, but it might be a happy medium for street-oriented guys.

[ashtaron14]

Originally Posted by Hujan

Yes, I've heard the purple PowerFlex diff bushings are much quieter than the delrin units. Obviously, you give up some performance, but it might be a happy medium for street-oriented guys.

Yes they are street oriented as my car will most likely never see a track. On another note I also have the Rogue Front Tension Arm Bushing. Now the front feels so sharp and the steering freeplay is next to none.

[pbonsalb]

Purple is too soft.

[Lucrecio84]

Originally Posted by Longboarder

There's an additional bushing that Malek can install that may actually significantly temper the sounds from going with solid diff mounts. Ask him to show you when you drop your car off.

I'm def doing the subframe mounts soon but the noise from the diff mounts turned me off so I was just going to do the subframes. But with this potential solution to quiet down the noise from the diff mounts, I may do that as well.

great thanks for letting me know, I'll for sure ask him about that. Kinda starting to second guess getting the diff mounts now. Gonna go for a ride in a buddies that has them and get an idea.

[Longboarder]

Originally Posted by Lucrecio84

great thanks for letting me know, I'll for sure ask him about that. Kinda starting to second guess getting the diff mounts now. Gonna go for a ride in a buddies that has them and get an idea.

It's still in R&D tho...my point being that if it's too loud with the solid diff mounts then maybe MRF will have a solution later to quiet it down.

I rode in Nick's car who has solid subframe and diff and it was too loud for me as well. So this could be a good solution for optimal performance.

[JEllis]

Originally Posted by Lucrecio84

great thanks for letting me know, I'll for sure ask him about that. Kinda starting to second guess getting the diff mounts now. Gonna go for a ride in a buddies that has them and get an idea.

The opinions in this thread about the NVH produced from the diff bushings truly shows how subjective things can be. I don't notice them anymore. If you have an aftermarket exhaust or listen to the radio, your most likely not going to notice the sound.

[Lucrecio84]

Originally Posted by squartus

Yep have the solid derlin diff bushings, huge difference in how the car is planted/traction as well as gets rid of wheel hop.
As stated it causes some pretty loud whine noise in the cabin, even with windows down and loud exhaust and supercharger you can still hear it until you hit around 70-80 mph then it tapers off. Iv had mine is for maybe 1 1/2 years now and does not bother me much unless windows are up then... its like deep inside your ear in certain gear/speed.

First thing everyone always asks when they get in car is WTF is that sound??
Know one of the companys are working on a isolator kit that may limit/remove the noise but we will see.

Thanks for the feedback. I really curious as to how loud it really is though. I can take a little noise, specially because it isn't my daily driver. Just hoping it isn't too much lol.

[Lucrecio84]

Originally Posted by JEllis

The opinions in this thread about the NVH produced from the diff bushings truly shows how subjective things can be. I don't notice them anymore. If you have an aftermarket exhaust or listen to the radio, your most likely not going to notice the sound.

You're right, its all very subjective, i'll make sure to keep that in mind. I don't mind sacrificing a little practicality for performance though so well see. I'd be surprised if I decided not to do them.