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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Oct-14-2019, 11:18:39 PM   #1
M3 AZ
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Default Rear Toe Alignment Help

Hi -

I have just had my car on a Hunter alignment today, and the garage who are well respected, locally at least, aren't able to adjust the rear toe properly. I'm told that it's at it's maximum adjustment and it seems to relate to the RTABs (they were done about 3 years ago (15-20k miles) with PowerFlex bushes)

I wasn't really able to inspect the bushes, so I'm a bit confused where to start with this.

I've seen the rear trailing arms at 500+ each for a new set, so I want to make sure I actually need them before throwing at this issue.

Can anyone make sense of the printout - the front was left as the printout states as it will need to be re-adjusted once the rear is sorted to balance it all.

Thanks


Last edited by M3 AZ; Mon, Oct-14-2019 at 11:21:52 PM.
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Old Mon, Oct-14-2019, 11:26:14 PM   #2
TboneM3
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Default Re: Rear Toe Alignment Help

Yo no see-o el photographeeo

Not sure exactly how bushing type would prevent you from achieving desired toe, but the toe setting is the rtab housing moving around in the pocket with the housing's bolt holes being elongated to allow for such movement to achieve desired toe.

Also, are you sure you mean toe and not camber? Front or rear, you don't want much toe. A little toe in on the rear, like 3/64 maybe 1/8 both sides, but my point is, it's not hard to achieve a small amount.
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Last edited by TboneM3; Mon, Oct-14-2019 at 11:47:25 PM.
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Old Tue, Oct-15-2019, 12:12:09 AM   #3
M3 AZ
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Default Re: Rear Toe Alignment Help

Thanks for the reply. The photo is here: (it shows in the post for me, weird)
https://i.imgur.com/Ga4F2Zg_d.jpg

I'm told that it's at maximum adjustment, and it's currently with too much negative toe!
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Old Tue, Oct-15-2019, 12:16:06 AM   #4
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Default Re: Rear Toe Alignment Help

I had a similar issue as well. My rear left toe could not be brought into alignment. In the end, I changed the RTAB's (preventative) and bought a used left rear trailing arm for cheap which I swapped out. After that, the shop was able to dial in my toe fine. Depending on how much it costs to align your vehicle, if cheap, I would change out the RTAB's and try an alignment again. If not cheap, I would change out the RTAB's and change out whichever trailing arm is the problem, then try the alignment again. This info is dependent on the toe being out of spec and not camber (people frequently mix that up). Just my two cents.
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Old Wed, Oct-16-2019, 02:29:53 AM   #5
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Default Re: Rear Toe Alignment Help

I had toe out on my car that couldn't be adjusted for with reasonably fresh spherical RTABs. I ended up needing to replace my upper control arms, one was slightly bent and the other was very bent. I would suspect the aluminum upper control arm before the steel rear trailing arm.
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Old Wed, Oct-16-2019, 05:26:34 AM   #6
nowanker
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Default Re: Rear Toe Alignment Help

After doing 1000+ alignments...
I've never personally seen bent upper control arms, either on the E36 or E46 chassis. Not to say it won't happen!
But I have changed out several trailing arms on both, to cure excessive positive camber and/or toe deviation (either way). Common cause was sliding sideways into a curb.
From the suspension geometry, I'd expect bent upper arms to cause a too-much-negative-camber issue instead of a toe problem.
Still can't see your readings! can you repost them?
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Old Wed, Oct-16-2019, 03:58:16 PM   #7
M3 AZ
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Default Re: Rear Toe Alignment Help

Thanks all - I'm not sure why the picture didn't work before. See below!

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Old Thu, Oct-17-2019, 06:13:49 AM   #8
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Default Re: Rear Toe Alignment Help

Quote:
Originally Posted by nowanker View Post
After doing 1000+ alignments...
I've never personally seen bent upper control arms, either on the E36 or E46 chassis. Not to say it won't happen!
But I have changed out several trailing arms on both, to cure excessive positive camber and/or toe deviation (either way). Common cause was sliding sideways into a curb.
From the suspension geometry, I'd expect bent upper arms to cause a too-much-negative-camber issue instead of a toe problem.
Still can't see your readings! can you repost them?

I looked for photos, but I couldn't find a picture of the comparison of my old upper arms to my new arms. But one of them was at least a 1/4 inch shorter than the new one. I had adjustable lower control arms, so I was able to get the 2 degrees of camber that I wanted, but by effectively having both arms shorter than they should be, it was like pushing the front of the wheel out, leaving me with something like 5/16ths of toe out per wheel. After replacing both sets of arms with new stock ones my alignment is perfect.
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Old Thu, Oct-17-2019, 06:15:13 AM   #9
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Default Re: Rear Toe Alignment Help

Here you go: https://imgur.com/Ga4F2Zg
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Old Thu, Oct-17-2019, 11:42:36 AM   #10
M3 AZ
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Default Re: Rear Toe Alignment Help

The photo keeps being removed -

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Discussing Rear Toe Alignment Help in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)