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BMR K-member and A-arms
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Angry BMR K-member and A-arms - 12-04-2011

I recently purchase a K-member and A-arms from BMR.

BMR-KM011R K-member, 1/2" lowered motor mounts, std rack mounts.
BMR-AA023R A-arms, lower, non-adj, poly/delrin, 18mm tall ball joint.

The K-member fit the body of the car with no binding anywhere and all the bolt holes lined up nicely with no binding. The driver side A-arm also fit correctly with all bolts centered and with no binding in the mounting holes. The steering rack also mounted to the K-member without issue.

When installing the passenger side A-arm there is definitely a fitment problem. The distance between the front mount and the rear mount is far to close causing a binding of the bushings and the outer rear bolt will not go in straight as a result and has serious binding.

The third photo shows the rear of the A-arm and shows the bolt is tight against the front of the mounting point on the A-arm even though it is slotted to make up for minor fitment issues. It is so tight the bolt will not go in straight as can bee seen if you look closely at under the head of the bolt where there is a gap towards the rear and none towards the front.

The forth photo shows the front mount and the rear bushing is collapsed and the front is not. If this bolt was torqued down it would severely stress the bushings and the rear mount.
This clearly show a dimensional discrepancy in either the A-arm or the K-member. If the bolts where actually torque down this would cause a serious binding of the suspension and different load left to right.

I have E-mailed BMR these photos and explanation. Now I just have to see how they intend to fix the issue.










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Last edited by Nice Pony; 12-04-2011 at 10:23 PM.
   
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12-04-2011

Have you tried loosening up the K member bolts? I assume you had them all torqued down before you installed the A-arms? Maybe if you do that and re tighten everything up from left to right and go back and forth things will center out. Kind of like tightening your lug nuts. It might be worth a try. I've heard very good things about the K member though.
   
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12-04-2011

The K-member fit up with no tension at all on the 8 bolts that hold it in. And the left side A-arm fits perfect. If the K-member was spread a little at the very rear where it mounts to the underside of the body that would basically equal out on both sides and it is so much further back form the A-arm mounting points the it would have very little effect dimensionally. Something is way off either on the rear mounting pad of the K-member or the right side A-arm.



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Bummer, I really had some interest in that set up. Can you do the K member and use stock A arms, or do you have to do the whole thing? There's a shop near my office in Anaheim that sells the parts, the K member is about $500 but the installation is like $850, way too much for me, and I don't have any place to do it myself.
   
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12-04-2011

This K-member will work with stock A-arms.



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12-05-2011

Have you tried fitting the stock a-arm to that side? It may help determine if the problem is the K-member or the a-arm. Just a thought...


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12-05-2011

Good idea. I pulled the stock K-member with the A-arms attached so I just need to take it off and give that a shot.



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12-05-2011

I received a call from BMR. They are aware of the problem. They had a production run of A-arms and the alignment fixture had been assemble wrong causing the A-arm to be manufactured to short. They thought they had caught them all before shipping but a few made it through. They are shipping a new one out today.

Great customer support by they way. The guy called me at 7:00AM Pacific Time and was extremely apologetic and told me that BMR prides itself in not having issues with parts that don't fit correctly. He knew exactly what the problem was as soon as he read my E-mail which was pretty much the same as this post along with the photos.



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Last edited by Nice Pony; 12-05-2011 at 09:50 AM.
   
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12-05-2011

I need to double check my BMR front suspension (I have the exact same ones as you, in addition to adding the sway bar). I dont remember having any issues with this but that might be because I am not too smart.


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Last edited by wtyler3; 12-05-2011 at 11:18 AM.
   
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Quote:
Originally Posted by wtyler3
I need to double check my BMR front suspension (I have the exact same ones as you, in addition to adidng the sway bar). I dont remember having any issues with this but that might be because I am not too smart.
He did say that only a few had slipped through the cracks so you are probably OK. It is very obvious it doesn't fit correctly but you may want to take look at that back bolt to see it is going in straight. If there is a gap under the bolt head on the back side like in my photo then you have the same issue.



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