Front suspension geometry

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01-22-2017, 10:02 PM
Cattrax

Front suspension geometry

All,
My Gen I GTM will be primarily for track day use. With that in mind, I am making a few suspension modifications, starting at the front. I will probably get adjustable upper control arms to add caster. For now I mounted the upper control arms under the brackets. I only had to modify 2 brackets each side by moving the little gussets to the outside of the control arm mounting bar. My intent was to increase camber gain. If I set camber to zero, I now have:
-1 3/8 deg on 1" bump
-3 deg on 2" bump
+7/8 deg on 1" droop
+1 7/8 deg on 2" droop
Does anyone care to comment on this for a track day car? Too much? Too little? I do not have anti sway bars yet but plan to add.

Also as others have noted, I need to correct the bump steer. I would welcome recommendations on a good bump steer kit for the front.

Thanks for your help.

Ken
01-23-2017, 02:38 PM
claybags

Sent you a PM.
Jeff
01-24-2017, 12:56 AM
Cattrax

Thank you Jeff.
I found what appears to be most of a FFR bumpsteer kit in the various boxes that came with my basket (b@$t@rd) case. Sleeves in one box, heim joints loose in a box of fasteners, and tapered shafts in a plastic bag in a different box. It looks like one of the previous builders had all the stuff laid out to build the car and then randomly boxed it up. I think I can find the shims and nylocks at McMaster-Carr. Good thing I like a challenge!
Ken

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