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      08-10-2019, 01:26 PM   #23
duder13
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Quote:
Originally Posted by Dackelone View Post
The main reason to use both M3 suspension links is bc the bushings are much more robust and don't allow for any deflection. I think this is what "fixed" my bumpsteer from the rear suspension. Btw... I already had M3 rear subframe bushings before any of these parts were installed.

Dack
Yeah, I was just saying part #17 actually has the same bushings as the OEM arm. Arm #18 is the one that has the bearing upgrade.

Still, even with the same bushings, the M3 arm #17 still looks way cooler and is a little lighter.
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      08-10-2019, 05:23 PM   #24
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Check out the OE vs M3 control arms thread. There's a new product in the works for toe arms that would allow you to go full spherical (in that part) with no deflection or Group N bushings for minimal deflection plus some spring rate contribution....

OE vs M3 Rear Suspension Arms
https://www.1addicts.com/forums/show....php?t=1079383



Stay tuned!
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      08-10-2019, 07:16 PM   #25
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Quote:
Originally Posted by duder13 View Post
Yeah, I was just saying part #17 actually has the same bushings as the OEM arm. Arm #18 is the one that has the bearing upgrade.

Still, even with the same bushings, the M3 arm #17 still looks way cooler and is a little lighter.

???

The factory 135i rear suspension parts are cheap stamped steel with a steel insert that sits inside a soft rubber bushing.

The M3/1M bits are light alloy arms with a hard bearing pressed into the arm. The black rubber is quite hard compared to the 135i bits.

The differences are night and day.




Some pics for reference, from the interwebs....
Name:  1 M3 Exploded View.jpg
Views: 77
Size:  89.1 KB

Name:  e9x_bush.jpg
Views: 79
Size:  70.5 KB

non M and ///M rear suspension...
Name:  E90M3RearSuspension.jpg
Views: 81
Size:  57.7 KB

///M rear suspension...
Name:  IMG_83441-1024x768.jpg
Views: 78
Size:  128.2 KB

stock 135i suspension...
Name:  inv_015622__16681.1523310721.jpg
Views: 77
Size:  63.2 KB
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      08-10-2019, 08:42 PM   #26
duder13
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Quote:
Originally Posted by Dackelone View Post
???

The factory 135i rear suspension parts are cheap stamped steel with a steel insert that sits inside a soft rubber bushing.

The M3/1M bits are light alloy arms with a hard bearing pressed into the arm. The black rubber is quite hard compared to the 135i bits.

The differences are night and day.




Some pics for reference, from the interwebs....
Attachment 2118068

Attachment 2118064

non M and ///M rear suspension...
Attachment 2118065

///M rear suspension...
Attachment 2118066

stock 135i suspension...
Attachment 2118067
Oh, I guess you havenít seen the classic fe1rx thread. Check it out below. He tested all of it, and despite being made of steel, the OEM arms have the same strength as the aluminum ones, albeit uglier and a little heavier. The bushings/bearings of the the 1M wishbone (upper) arms (#17) are also the same as OEM, so, from a performance perspective, the guide rods (#18) and toe arms are the only things that need to be upgraded, weight not withstanding.

You can even see in your pic above that the OEM wishbone arms have a bearing on one side and bushing in the other.

https://www.1addicts.com/forums/show....php?t=1079383

Last edited by duder13; 08-10-2019 at 08:49 PM..
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