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  #1 (permalink)  
Old 07-04-2017, 11:02 PM
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Join Date: Mar 2013
Location: West Haven, CT
Cobra Make, Engine: Lone Star, Ford 302W
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Default Bump Steer

I've been driving my Cobra for a couple months since completing it after working on it for about 5 years. Being a chassis nerd, I noticed there was a ton of bump steer in the front end, but didn't take the time to try to do anything about it because I was all wrapped up in assembling the thing and not much was mentioned about it on the Lone Star Forum, so i figured it wasn't a big deal. But the faster I drive the thing, the more it bothers me. Has anyone done anything to address this issue?
Am I correct in assuming the front end geometry is similar to a Mustang-II? I know the steering rack needs to be raised, or the steering arm pivots need to be lowered a considerable amount, and there are kits to do exactly that available for the M-II with spacers, etc. Just wondering if this is some popular "must do" thing I just didn't know about.
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  #2 (permalink)  
Old 10-17-2017, 07:42 AM
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Cobra Make, Engine: Lone Star with IRS, 427W with megasquirt, T56 magnum
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The caster affects the needed elevation of the rack. If you're running more positive caster than the stock M2 alignment, you may need to raise the rack. With a little geometry you can figure out how much. I think you could easily elongate the 2 rack mounting holes and fix it that way, or reduce the caster. The positive caster gives more restorative force to center the wheel at speed, which isn't a bad thing in this short wheel based car. I think I'm only running 2 deg and have no noticeable bump steer.
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  #3 (permalink)  
Old 12-06-2018, 02:04 PM
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Cobra Make, Engine: Lone Star Classics, Ft Worth, TX
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Default All Geometry is bad not just bump steer

The geometry on a Lone Star is horrible. Bump steer is the least of the issues. The LSC was designed by a street rod guy and made more like a street rod than a good handling sports car.
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  #4 (permalink)  
Old 12-06-2018, 03:24 PM
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Cobra Make, Engine: AP 289FIA, SBF
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Bump steer will also cause the inner side of your front tyres to wear very quickly.
Is there a mod available for the steering knuckle to raise or lower the steering outer tie-rod to a static horizontal position?
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