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Old 08-04-2013, 05:05 PM
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Need some help with troubleshooting my TCI front end

I installed a TCI custom front end on my street rod about 6 years ago, and never liked the feedback it gave me when driving on bumpy roads. I've put over 20000 miles on the car, but because the roads around here are getting worse I would like to see if I can reduce some of steering feedback.
The problem is worse when hitting a bump only on one side, to the point that the steering wheel will almost get ripped out of your hands if you don't have a good grip on it.
I'm running a 26" tall tire, with a zero offset rim. I'm concerned that my scrub radius is too large (around 4 inches) but read that this large of S/R was the norm for some of the older cars. My caster is set at 5 degrees, and I put my camber at .5 to try and put more weight on the inside of the tire.
Thanks for any help.

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Old 08-04-2013, 05:17 PM
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tie rods parallel with the lower control arms
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Old 08-04-2013, 05:59 PM
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I have Air ride Shockwaves all around, and have tried different heights. At normal drive height, the lower control arms are perfectly flat.(parallel to ground)
It's a rack & pinion, and TCI designed it so the rack is not moveable. Looking at it from the front, the lower control arm and tie rod are very close to being parallel. I checked bumpsteer when the car was built, and it was fine. Tomorrow, I will be re-checking bumpsteer with a proper gage, but I don't think that's my problem because bump steer will make the car wander over bumps and not send violent feedback back to the steering wheel.

Last edited by hemi43; 08-04-2013 at 06:07 PM.
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Old 08-04-2013, 06:04 PM
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Quote:
Originally Posted by hemi43 View Post
I have Air ride Shockwaves all around, and have tried different heights. At normal drive height, the lower control arms are perfectly flat.(parallel to ground)
that's not what I asked, are the tie rods parallel with the lower a arms..
ride height, don't matter..
when the a arms are parallel with the ground, are the tie rods? are they level or pointing down or up. with the rack?
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Old 08-04-2013, 06:46 PM
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I my reply above, I stated that my tie rods were very close to being parallel to my lower control arms. When I said very close, I would say within 1/8" .
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Old 08-05-2013, 07:54 AM
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Have you verified the castor? Five degrees is good, but only if it's positive. That's about the only thing I can see that would jerk the wheel like you're saying, unless it's something mechanically broke or wore out to the point you'd notice it on a suspension component check...

Russ
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Old 08-05-2013, 01:17 PM
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i ran a gm pump with a ford rack and experienced the same problems
after 2 years i installed a flow reducer on the gm pump and all is well now
similar to what speedway sells, mine was ebay

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Old 08-05-2013, 06:07 PM
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It ended up being too much bump steer. I had to machine 1/4" off of the bottom of the rack mounting tab to get enough movement. Runs much better now, but I will never purchase another TCI product again.
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