Adjusting adjustable rear control relocation brackets. - Ford Mustang Forum
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post #1 of 10 (permalink) Old 06-21-2015 Thread Starter
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Adjusting adjustable rear control relocation brackets.

Good afternoon gents and Happy Fathers day to all that applies.

I recently installed BMR's excellent adjustable lower control arm relocation brackets to correct the rear suspension geometry. Im lowered on Ford Racing K springs.

With the rear control arms in the center hole of the relocation bracket the control arms are pointing slightly down. With the stock mount the control arms were pointing up and i got alot of wheel spin when I floored it.

Wheel spin has been reduced BUT the handling of the car is now "looser" ie it wants to over steer now. The car feels like I installed a stiffer rear sway bar.

I cant get the control arms perfectly level with the factory control arms. With the factory control arms I cant use the top hole because they hit the mount.

Does this make sense? will the control arms pointing slightly down really affect my handling or is something else going on?

Thanks for the help!!!

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post #2 of 10 (permalink) Old 06-21-2015
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I'm still learning about this stuff myself, so someone correct me if I'm wrong, but I believe the arms should be slightly angled down toward the rear of the car because under hard acceleration the rear end squats which levels out the arms, increasing traction and reducing wheel hop.

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post #3 of 10 (permalink) Old 06-21-2015
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I recently installed the BMR LCAs and relocation brackets as well. At the time I was stock height but last weekend I installed a set of lowering springs. At stock height I was using the middle holes on the brackets. I haven't re-adjusted the LCAs yet, but as far I know, the LCAs should be close to level, or point slightly downward in the rear. I haven't noticed any issues. Do you also have an adjustable panhard bar? I have heard that if the axle is a little off center one way or the other, it'll feel loose and cause some problems.

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post #4 of 10 (permalink) Old 06-21-2015
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mine is slightly down too. I still dont see why you cant use the top hole though. Im not understanding what its hitting.

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post #5 of 10 (permalink) Old 06-21-2015
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Quote:
Originally Posted by Blackpenguin69 View Post
mine is slightly down too. I still dont see why you cant use the top hole though. Im not understanding what its hitting.
Here is a post from 2013 that has a photo of the stock LCA and the part that prevents it from being used in the top hole. It looks like a slight modification will allow use in this hole.

Ford Mustang Forum - View Single Post - Lower control arm relocation bracket

I run Steeda LCAs and BMR brackets. I'm using the second hole and my LCAs are angled slightly lower in the rear.

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post #6 of 10 (permalink) Old 06-21-2015
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Quote:
Originally Posted by RoboStang View Post
Here is a post from 2013 that has a photo of the stock LCA and the part that prevents it from being used in the top hole. It looks like a slight modification will allow use in this hole.

Ford Mustang Forum - View Single Post - Lower control arm relocation bracket

I run Steeda LCAs and BMR brackets. I'm using the second hole and my LCAs are angled slightly lower in the rear.
ahh i see, WEll good news is that BMR has LCA's for $80 that will fix that issue.

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post #7 of 10 (permalink) Old 06-21-2015
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Yes that makes sense. You're inducing some roll steer with the altered geometry.

Stock Car Roll Steer - The Effects of Rear Axle Movement - Stock Car Racing Magazine
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post #8 of 10 (permalink) Old 06-22-2015 Thread Starter
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Thank you gents for all of your inputs, and yep Ive got an adjustable panhard bar, 0 thrust.
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post #9 of 10 (permalink) Old 06-22-2015 Thread Starter
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Would stiffening or softening the rear shocks eliminate some of the roll steer? I guess Ill try out!
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Quote:
Originally Posted by Usmc1488 View Post
Would stiffening or softening the rear shocks eliminate some of the roll steer? I guess Ill try out!
Yes but it doesn't counteract it- it just adjusts handling bias through a different mechanism. Generally, more rear rebound=more oversteer on corner entry.

GREAT shock tuning writeup-

http://www.theoryinpracticeengineeri...%20article.pdf
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