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05-11-2016, 03:30 AM | #1 |
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135i Rear Toe Arms
Does anyone have experience with any upgraded rear toe arms? One issue that is imho near tragic on the 135i, is side to side deflection / rear end flex on hard acceleration... the car literally bounces side to side. My car had the M3 rear subframe bushings done and this fixed the up and down bounciness but the car had insane side to side flex when accelerating onto a highway ramp or any scenario of that sort. Does anyone know what fixes this?
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05-11-2016, 07:41 AM | #3 |
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I'm no expert, but it would seem to me like the issue is the bushings in play here, not the arms themselves. I would think switching to poly bushings or even better, spherical bushings, would probably help a lot.
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05-11-2016, 07:44 AM | #4 | |
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05-11-2016, 08:17 AM | #6 | |
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05-11-2016, 08:28 AM | #7 |
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What about the rear trailing arms? For safety purposes, the arm should remain stock so in a crash it bends away from the fuel tank (arm is identical on M3), but you can upgrade the bushings. No expert, but don't people usually point to the RTAB when it comes to an unstable rear?
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05-11-2016, 08:33 AM | #8 |
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I dunno, this sounds like it could be an out-of-alignment setup or perhaps a bent rear suspension arm??? I have my car bone stock, and I get instability in the rear accelerating out of slow corners at the track. It's not that bad, it's just slower than it should be.
How are you determining you have side-to-side flex in the RSF?
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05-11-2016, 08:40 AM | #9 | |
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This happens on hard straighline acceleration, its so bad and disconcerning... suspension is fine.
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05-11-2016, 10:44 AM | #11 |
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are you saying something is damaged or bent? Because I know that is not the case.
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05-11-2016, 11:23 AM | #13 |
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05-11-2016, 11:33 AM | #14 |
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Easiest thing to start with IMO
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05-11-2016, 11:47 AM | #15 | |
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05-11-2016, 11:48 AM | #16 |
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What spec would you recommend?
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05-11-2016, 11:56 AM | #17 | |
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Maybe try 0.15 deg toe in on both sides. Last edited by MightyMouseTech; 05-11-2016 at 12:08 PM.. |
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05-11-2016, 12:07 PM | #18 | |
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05-11-2016, 12:22 PM | #19 |
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05-11-2016, 02:37 PM | #20 | |
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05-11-2016, 02:39 PM | #21 | ||
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05-13-2016, 07:38 AM | #22 |
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Same issues here, made a thread about it. Had 25 people chime in that it's the alignment.
I've run everything from 1/16" to 1/4" of rear toe. It it absolutely not alignment related. There's a large amount of flex and/or dynamic toe change going on back there. Feels like a rubber band winding up and releasing at times. I bought some Whiteline poly bushings for both the toe and trailing arms...being dragging my feet installing...but I will soon. I'll let you know.
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