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Old 08-01-2013, 08:19 AM
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Nervous Steering.

I have a Everett-Morrison Cobra and would like some advice on front end alignment specs. Right now the Camber is set at 0. Caster is set at 30. Toe in is set at 1/8. Tire wear is great, I have 15,000 miles on the tires and they are wearing fine, but the steering is very "nervous", kinda darty. It feels like the old shifter-kart I drove. I'm running tubular A-arms, Aldan coil-overs, and a Mustang II rack. Replaced the rubber bushings front and rear with Poly. Front tires are BFG's 245/60/15's with 30 psi. Any suggestions on how to calm-down the steering? Thanx, Rob.

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Old 08-01-2013, 02:29 PM
kso kso is offline
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Caster at 30?
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Old 08-01-2013, 04:02 PM
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Think the caster is set at 30 degrees.
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Old 08-01-2013, 04:35 PM
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Here is a diagram explaining caster - it sounds like you need more positive caster, but a reasonable figure would be 3-7 degrees positive. 30 degrees doesn't sound right. Maybe you have 3 degrees?
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Old 08-01-2013, 06:19 PM
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power steering ?

Mustang Power steering can be twitchy if the pump pressure is too high, If using a Gm pump you can buy a kit to reduce pressure. also if the rack bushings are old-soft the rack can move too much. I think 79 and later Fox mustangs can have faster ratio, mabe to much for the feel you want. Have you tried Club Cobra Forums to ask other Cobra kit car owners,
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Old 08-01-2013, 08:18 PM
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30 !!!!

Set it at 5* then try it..
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Old 08-02-2013, 03:36 AM
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Yup, caught me, it's 3 degrees. Will try to go abit more positive. Thanks for the info.
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Old 08-02-2013, 09:51 AM
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Yeah, 3 degrees sounds realistic. Very high caster angles are for cars that are also very light in the front end but nothing short of a top-fuel dragster would have a setting much beyond 15.

For a Cobra with it's front engine, you wouldn't want a whole lot of angle but with the engine setback and probably with wide front tires, I don't think 3 is near enough. I'd try 5-7 degrees to start with while checking w/ other owners what they've found works. The above comments about the rack and line pressure make sense and would be the next thing to look into. Your toe-in and camber seem reasonable.

Since you're probably going to visit the alignment shop anyway, a DIY experiment could be to adjust each upper a-arm so that the ball joint moves back a half-inch (same each side!) and try that out to see if you like it better. You might just hit it by luck right there.
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Old 08-02-2013, 01:17 PM
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The higher the caster (positive) the better it "tracks" down the highway, and the less rolling resistance it has. This is why top fuelers and Bonneville salt flats cars have very high caster, Bonneville cars will run 18!

As an example a 7 series BMW made for high speed Autobahn driving will have 7-8 degrees positive. While a 3 series will have 3-4 as they are more for handling and hanging corners.

Be sure it IS 3+ and not .3+, do you have your print out? The less caster the more "darty" it will be.

Brian
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