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      08-13-2019, 10:18 PM   #1
houtan
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Rear upper m3 arms hitting chassis

Has anyone run into this issue? I recently switched out my dinan rear shock mounts to akg black mounts to reduce the suspension travel in the rear. Initially it was to prevent the passenger rear tire from hitting the fuel filler neck.

After a few canyon runs the issue appeared to be fixed...until I started working on my rear brakes last weekend. Not only is the tire still hitting the fuel filler neck, but my rear m3 arms are hitting the chassis. Has anyone else run into this problem with rear m3 arms?

I have some suspension ďpackers ď (picture below) someone told me about in a different thread. I guess I need to insert one to reduce travel a little more and see how things are but I am really curious if anyone else has run into this and what you did to resolve it.

Itís possible this was occurring with the dinan mounts and I didnít notice. However, after seeing the tire is still hitting the fuel filter neck, I am still suffering from too much suspension travel, so itís possible the upper m3 arm contacting the chassis is still occurring with the akg mounts as well.

Rear suspension setup: m3 upper arms, m3 lower camber arm, m3 TC Kline DA rear shocks, 600lb TC springs, toe arms, white line rsfb.

Would love to hear other peopleís experiences.
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      08-14-2019, 06:20 AM   #2
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Almost looks like the bump stops are too short...
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      08-14-2019, 08:56 AM   #3
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Are they upside down? Can't remember which arm back there is installed the other way.
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      08-14-2019, 09:01 AM   #4
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^^
They are handed. Someone else on here (not me honest) had a professional shop install them wrong.
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      08-14-2019, 09:30 AM   #5
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From this thread....

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


The M3 Guide Rod is forged aluminum with inboard ball joint and outboard rubber bushing. The forged bodies of the LH and RH arms are identical but installation of the bushings makes them handed. The bodies are curved (downward), not for installation clearance issues, but to ensure that the compressive failure of this member will be by progressive bending. The ball joint used at the inboard location effectively doubles the stiffness and halves the deflection under axial loading versus the OE Guide Rod, which will alter (and presumably decrease) compliance steer effects.

Also from post #72 is discussion about wrong installation.
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      08-14-2019, 11:08 AM   #6
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Very interesting. I just got a set of replacement rear arms that I was about to install as well. And I have almost the same setup as you, except I'm using the 135 rear shock and camber arm not the M3 one.

I'm also using the stiffer Monroe upper shock mount, not sure how it's dimensions compare to the AKG ones though.

How low is your car?
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      08-14-2019, 03:07 PM   #7
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Thanks for the posts.

@shocknawe, I am 99% sure they are not installed updside down. But anything is possible and it wouldn't be the first time I did something wrong! Based on the fe1rx link, I have mine installed just as the picture in his op.

gjm120, I believe the excerpt you posted is for the guide rod, which gets mounted curve side down, but points angled forward sort of. The arm in my pictures that is making contact to the chassis is the wishbone, I believe that should be mounted with the curve side up, which is how I have it.

@dtla, My car is not that low imo, but the best way to tell the ride height is to look at the pictures in my "garage". My guess is I have a half to one finger gap in the rear.

@1and1, I do think the bump stop may be to short and I need to add one or two packers to limit travel.
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      08-14-2019, 03:32 PM   #8
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Quote:
Originally Posted by houtan View Post
Thanks for the posts.

I am 99% sure they are not installed updside down. Based on the fe1rx link, I have mine installed just as the picture in his op.

The excerpt gjm120 posted is for the guide rod, which is gets mounted curve down, but points angled forward sort of. The arm in my pictures that is making contact to the chassis is the wishbone, I believe that should be mounted with the curve side up, which is how I have it.

My car is not that low imo, but the best way to tell the ride height is to look at the pictures in my "garage". My guess is I have a half to one finger gap in the rear.

I do think the bump stop may be to short and I need to add one or two packers to limit travel.
Yeah, every pick I've seen also shows the guide rod curve down and wishbone curve up.

Another consideration is that maybe you have things switched and have the guide rods in the wishbone spot???

As a last resort, you could always consider going back to the stock 135i wishbone that is straight. It has the same bushing/bearing setup as the M3 version, so the only performance penalty is just a little extra weight from the steel vs. aluminum.

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      08-14-2019, 03:53 PM   #9
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Quote:
Originally Posted by houtan View Post
Thanks for the posts.

@shocknawe, I am 99% sure they are not installed updside down. But anything is possible and it wouldn't be the first time I did something wrong! Based on the fe1rx link, I have mine installed just as the picture in his op.

gjm120, I believe the excerpt you posted is for the guide rod, which gets mounted curve side down, but points angled forward sort of. The arm in my pictures that is making contact to the chassis is the wishbone, I believe that should be mounted with the curve side up, which is how I have it.

@dtla, My car is not that low imo, but the best way to tell the ride height is to look at the pictures in my "garage". My guess is I have a half to one finger gap in the rear.

@1and1, I do think the bump stop may be to short and I need to add one or two packers to limit travel.
Yes - it was the guide rod. It is curved downward and the way to tell right from left is what end the bushing or bearing is on. FWIW I think the guide rod is most improvement for the money/effort.
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      08-15-2019, 05:12 PM   #10
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Quote:
Originally Posted by houtan View Post
Thanks for the posts.

@shocknawe, I am 99% sure they are not installed updside down. But anything is possible and it wouldn't be the first time I did something wrong! Based on the fe1rx link, I have mine installed just as the picture in his op.

gjm120, I believe the excerpt you posted is for the guide rod, which gets mounted curve side down, but points angled forward sort of. The arm in my pictures that is making contact to the chassis is the wishbone, I believe that should be mounted with the curve side up, which is how I have it.

@dtla, My car is not that low imo, but the best way to tell the ride height is to look at the pictures in my "garage". My guess is I have a half to one finger gap in the rear.

@1and1, I do think the bump stop may be to short and I need to add one or two packers to limit travel.
Went back and double checked, you have it correct. At least up vs down.

I remember it being pretty damned hard to install them backwards as they are handed.
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      08-16-2019, 08:41 AM   #11
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Thanks for double checking.

I discovered something interesting yesterday afternoon. So I jacked up the passenger side suspension to mimic being on the ground and took some measurements. It seems the amount of suspension travel I have is equal to the amount of space between the wishbone and chassis. So once the bump stop starts to compress the camber arm would be touching the chassis.
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