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Old 08-23-2018, 09:09 AM   #1
moatilliatta
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Z3M Trailing arm Geometry (Different?)

Are Z3M Trailing arm Geometry the same as normal E30?


I have a set on my car and out of the box they have 1* of toe out per side.
About 1/4 inch of toe out total in a factory subfame.

I have redone a subframe using POSILOK adjuster vs eccentrics for more adjustability. With toe in MAXED, I am at almost zero toe.

Thoughts?
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Last edited by moatilliatta; 08-23-2018 at 01:15 PM.
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Old 10-14-2018, 07:32 PM   #2
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Iíd question the subframe, and the straightness of the arms, the pic up points are supposed to be the same iirc. Sorry not much help, but some thoughts if nothing else


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Old 10-19-2018, 05:40 PM   #3
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I swapped subframes. No real change.

Both arms have quite similar toe. Odd that they would be equally bent.
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1999 BMW 318Ti/M Hellrot Msport DD/Fun car
1/2 1987 BMW 325is/M Future Spec e30 (track prep'd)
1994 530It/A Alpinewise III Traded out
1988 BMW 325ix/M Diamond Schwartz Recently sold :/
1986 BMW 325e/m Bronzit Beige Metallic

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Old 10-20-2018, 11:39 AM   #4
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I installed a pair of z3m trailing arms and had similar toe issues. I chalked it up to the arms being from a theft recovery car.

Maybe they are slightly different due to the (small) width difference between the subframes?

I ended up welding in the adjustment plates and IIRC had to make the slots larger to get full articulation and back into spec. They also loosen so I recommend tack welding them once set.
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Old 10-21-2018, 05:16 AM   #5
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Being that both Z3M trailing arms were about identical out, it led me hard to believe that they were NOT damaged.

I used the serrated style adjusters from IE. I've got tired of worrying about it and hopefully this is a new solution to loose trailing arm adjusters.

They've been modified with Grade 8 1/2 Bolts, bevel washers, and a nut welded instead of the serrated end tapped/ threaded.

I couldn't find Metric hardware to work properly, Fits the sleeves of most bushings better also.

TC01 Subframe Rear by Zachary Ketring, on Flickr

TC01 Subframe Rear by Zachary Ketring, on Flickr

TC01 Subframe Rear by Zachary Ketring, on Flickr

TC01 Subframe Rear by Zachary Ketring, on Flickr
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1999 BMW 318Ti/M Hellrot Msport DD/Fun car
1/2 1987 BMW 325is/M Future Spec e30 (track prep'd)
1994 530It/A Alpinewise III Traded out
1988 BMW 325ix/M Diamond Schwartz Recently sold :/
1986 BMW 325e/m Bronzit Beige Metallic

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www.bluegrassbimmers.org
OKI BMW Facebook group

BMWCCA Member# 436428

ZAKSPEED
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Email: Zach Ketring @ Zach@Zakspeed.us

Last edited by moatilliatta; 10-21-2018 at 05:23 AM.
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Old 10-21-2018, 11:19 AM   #6
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That looks quite beefy. I must have had an older smooth set, the serrated ones weren't on my radar.

I made some sharpie marks on the adjusters as well for a quick visual check that nothing had moved. They haven't moved after years of track use, so hopefully you will have it made in the shade.
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