Rear Subframe Question

[Candia4441]

Reposting my reply under the correct topic name:
Jan. 27 2022

OK, I was clearly wrong.

I currently have 2 CS rear subframes. The one in Patricia Mayer's car and the shiny black one that is center image on slide 2. Both are identical.

It is very clear that Bavaria (E3) rear subframes are noticeably different. The easiest way to note the difference is the outer mounting point. On the CS the bolt center line is roughly in the very center of the entire subframe arm. On the E3's it is sunken noticeably lower to the lower edge. Slide two and three show these differences. See also BMW's part no. differences including the E12, that I shot my mouth off earlier -slide 1. That's like the 17th time this week I've been wrong . Apologies to Ohmess and the great Al Taylor for being spot on!

A tip of the chapeau to @Mike Pelly who just provided the clearest image of these differences. Note both the inner and outer bolt hole center lines. Thanks Mike!


Back to answering the original question and concern:

We have (1) E9 subframe for sale and (1) E3 subframe for sale this Saturday.

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I think you will know if E3 rear trailing arms are same with a E9 if it is please let me know I fined a E3 set if it is a same I want to buy for my E9

 

[bavbob]

Markos, not sure if that E3 you showed was yours but if so, get a rear sway bar. They were optional on the early cars. I added one with quite a dramatic effect on handling.

 

[Ohmess]

I am referring to garagetastic. This should also inform sellers on the value of a rear subframe.

E9 and E10 Adjustable Rear Subframe Conversion - 2002, CSL

E9 AND E10 ADJUSTABLE REAR SUBFRAME EXCHANGE PROGRAM The stock E9/E10 rear subframes does not allow you to align the rear wheels. This problem carried onto future subframes like the E28 and the E30. Alignment is a critical point in how your car handles and wears tires. Especially important in...

www.garagistic.com

@Markos - the eccentric bolt with the welded in channel is a much better design. This is essentially the mechanism in the rear of my e39 540. Very robust.

 

[Markos]

Markos - the eccentric bolt with the welded in channel is a much better design. This is essentially the mechanism in the rear of my e39 540. Very robust.

Just to clarify, are you stating that you like the garagetastic design? I presume so because it uses welded channels and an eccentric bolt. What is the alternative design or that you mentioned? The factory setup? Thanks!

 

[Ohmess]

Just to clarify, are you stating that you like the garagetastic design? I presume so because it uses welded channels and an eccentric bolt. What is the alternative design or that you mentioned? The factory setup? Thanks!

Yes. Good design. Just like the e39 factory setup I posted earlier in this thread.

The alternative design that I had trouble with was the Ireland Engineering "posi-lock" setup:

Adjustable Rear TOE Kit – Posi-Lock Style

Each Kit

www.iemotorsport.com

 

[Candia4441]

Thanks guys -- will try to do the measurement after I remove the dif. Here are more pictures of the comparison. The trailing arms fit into the new subframe.

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Look like your new sub frame is E3 sub frame according to a picture is posted to sale a E3 sub frame maybe I am wrong.

 

[Ohmess]

Look like your new sub frame is E3 sub frame according to a picture is posted to sale a E3 sub frame maybe I am wrong.

Yes, that was an e3 subframe. I returned it to the seller in 2017.