Bimmerworld delrin rear subframe bushings

jbiswurm · 08-28-2020, 07:47 PM

Hi all-

I have seen many post of F30 rear subframe bushing upgrades. I just got the bimmerworld delrin and aluminum version installed while i was getting a wavetrac put in.

And..... wow. This is hands down the best thing ive done to the car. The vagueness is gone and the car holds the road with such a confidence inspiring feel.

Yes, you need to drop the subframe. Yes, its a total bitch. Yes, its so worth it.

Taking it a little easy on the wavetrac for a few miles and then ill have thoughts on that.

Watsey · 08-28-2020, 08:05 PM

Have you noticed any downsides, i.e. less roll in the rear of the body = understeer ?

jbiswurm · 08-28-2020, 08:14 PM

Quote:

Originally Posted by Watsey

Have you noticed any downsides, i.e. less roll in the rear of the body = understeer ?

No, not at all. I have the stock rsb. The suspension components are there to do their job and provide the compliance needed but now the slop of uncontrolled subfram movement is gone.

What many folks dont realize is that as the subframe squishes and flexes all around it changes your alignment configuration.

I couldnt be more pleased

Eschmacher · 08-28-2020, 08:44 PM

Similar results here. I think there is a little more noise transmitted from the drivetrain/wheels but it's worth it.

It also accents the weaknesses of the differential bushings IMO. Once I get my vibration figured out, I am considering a diff lockdown kit or the diff bushing inserts.

Edit: I still get a bit of axle hop when I try to leave hard from a dead stop - which is what I mean about the diff bushings.

mike082802 · 08-29-2020, 05:14 AM

how much was the installation? are these one piece or two piece?

jbiswurm · 08-29-2020, 01:41 PM

Quote:

Originally Posted by mike082802

how much was the installation? are these one piece or two piece?

Theyre delrin on the outside and aluminum inside. About 300 for the bushings and i paid 5 hours labor to drop the rear subframe to install., so its 800-1000 to do. I can say that for me, its easily worth that much - no question.

Logicoeur · 08-29-2020, 05:23 PM

How do you know that the uncertainty from the rear end wasn't fixed by the LSD?

jbiswurm · 08-29-2020, 06:42 PM

Quote:

Originally Posted by Logicoeur

How do you know that the uncertainty from the rear end wasn't fixed by the LSD?

Fair point for sure. However, ive been taking it a bit easy on the throttle to give the diff a bit of running in. The stability is there regardless on throttle input-on throttle, off throttle, maintenance throttle, so I attribute the improvement in stability to the bushings. But, yea, youre right in that i dont know for sure.

What i do know is that i am thrilled with the car now and my "wolf in sheep's clothing" is basically complete now.

Polo08816 · 08-30-2020, 12:07 AM

Quote:

Originally Posted by Logicoeur

How do you know that the uncertainty from the rear end wasn't fixed by the LSD?

I have the M Performance LSD but not the solid subframe bushings. I'm looking to have the solid subframe bushings in before next track season.

Since the subframe has to be dropped and I have 120k miles on the car, I'll probably replace the rear differential bushings at the same time.

Logicoeur · 08-30-2020, 09:12 AM

Quote:

Originally Posted by Polo08816

Quote:

Originally Posted by Logicoeur

How do you know that the uncertainty from the rear end wasn't fixed by the LSD?

I have the M Performance LSD but not the solid subframe bushings. I'm looking to have the solid subframe bushings in before next track season.

Since the subframe has to be dropped and I have 120k miles on the car, I'll probably replace the rear differential bushings at the same time.

Same boat almost. Lsd and a poly diff mount insert.

Polo08816 · 02-10-2021, 07:15 PM

Quote:

Originally Posted by jbiswurm

Theyre delrin on the outside and aluminum inside. About 300 for the bushings and i paid 5 hours labor to drop the rear subframe to install., so its 800-1000 to do. I can say that for me, its easily worth that much - no question.

How far does the subframe have to be dropped?

I was browsing Millway's site and came upon these installation instructions for this:

https://www.millway.se/pub/media/wys...19-web-eng.pdf

brigade24 · 02-13-2021, 11:46 AM

Quote:

Originally Posted by Polo08816

How far does the subframe have to be dropped?

I was browsing Millway's site and came upon these installation instructions for this:

https://www.millway.se/pub/media/wys...19-web-eng.pdf

depends what tool is being used to remove/install. i dropped mine about 10" to put the new ones in. I burned the old ones out because that's what they deserved.

The only issue with delrin is that it doesn't have the elasticity that poly has, so if they deform/crack in any way, they can lose their original shape and allow movement...this is a rare but possible occurence. I have delrin in my subframe and so far so good. Car feels planted and I can power out of corners earlier. If you care about that, then this mod is very much worth doing. Note, that this is not a job for the faint of heart.

mike082802 · 02-13-2021, 01:34 PM

thinking of picking up the whiteline poly subframe bushings, only $160, same part number as what i used in my e82. i also only dropped mine like 6" and heated up the bushings and used the weight of the car and a 24 or 26mm socket to push out the old bushings. lubed up the whiteline 2 piece and slid them in. and i agree one of the best mods i did on my e82.

08-28-2020, 07:47 PM	#1
jbiswurm Second Lieutenant 68 Rep 241 Posts Drives: F30 335i msport 6mt Join Date: Oct 2013 Location: MA iTrader: (0)	Bimmerworld delrin rear subframe bushings - wow Hi all- I have seen many post of F30 rear subframe bushing upgrades. I just got the bimmerworld delrin and aluminum version installed while i was getting a wavetrac put in. And..... wow. This is hands down the best thing ive done to the car. The vagueness is gone and the car holds the road with such a confidence inspiring feel. Yes, you need to drop the subframe. Yes, its a total bitch. Yes, its so worth it. Taking it a little easy on the wavetrac for a few miles and then ill have thoughts on that.
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08-28-2020, 08:05 PM	#2
Watsey Major General 6399 Rep 8,489 Posts Drives: F31 330D sDrive M Sport Join Date: Jun 2015 Location: On sabbatical. iTrader: (1)	Have you noticed any downsides, i.e. less roll in the rear of the body = understeer ? __________________ Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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08-28-2020, 08:44 PM	#4
Eschmacher Car Hypochondriac 335 Rep 901 Posts Drives: 2014 335i M-Sport Estoril Blue Join Date: Feb 2017 Location: Sterling, VA iTrader: (0) Garage List 2014 BMW 335i [0.00]	Similar results here. I think there is a little more noise transmitted from the drivetrain/wheels but it's worth it. It also accents the weaknesses of the differential bushings IMO. Once I get my vibration figured out, I am considering a diff lockdown kit or the diff bushing inserts. Edit: I still get a bit of axle hop when I try to leave hard from a dead stop - which is what I mean about the diff bushings. __________________ Power mods: VRSF IC/Catted DP - FTP CP/BP - AFE Cat-back - BM3/XHP - Dorch S2 Handling mods: Koni yellow - Eibach prokit - Millway street - M Performance LSD - M3 brakes - EBC bluestuff Exterior: Euro LCI tail lights - Shitty ECS CF spoiler - Chinese M performance diffuser Interior: Bavsound stage 1 and subs - custom trunk sub by Mike1327 Last edited by Eschmacher; 08-28-2020 at 08:54 PM..
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08-29-2020, 05:14 AM	#5
mike082802 Major 114 Rep 1,004 Posts Drives: 2010 135 Join Date: Feb 2014 Location: ny iTrader: (2)	how much was the installation? are these one piece or two piece?
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08-29-2020, 05:23 PM	#7
Logicoeur Lieutenant Colonel 990 Rep 1,934 Posts Drives: F30 335i xDrive Join Date: Feb 2018 Location: Boston iTrader: (0)	How do you know that the uncertainty from the rear end wasn't fixed by the LSD? __________________ F30 335iX \| Remus Axleback \| Fabspeed Catted DP \| VRSF Comp IC \| 18X9 ET35 19lb MT1 \| 255/40/18 ECS \| Ohlins RT Millway Street \| Millway Control Arm Bushings \| Turner Endlinks \| TMH 75mm 14x1.5 Studs \| BMW MPerf LSD \| XDelete \| Pipercross Filter \| MHD Stg2 93
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02-13-2021, 01:34 PM	#13
mike082802 Major 114 Rep 1,004 Posts Drives: 2010 135 Join Date: Feb 2014 Location: ny iTrader: (2)	thinking of picking up the whiteline poly subframe bushings, only $160, same part number as what i used in my e82. i also only dropped mine like 6" and heated up the bushings and used the weight of the car and a 24 or 26mm socket to push out the old bushings. lubed up the whiteline 2 piece and slid them in. and i agree one of the best mods i did on my e82.
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