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Date Posted: 10:16:48 07/12/00 Wed
Author: Maples
Subject: Re: Caster Stagger
In reply to: Dave (fsstek) 's message, "Re: Caster Stagger" on 03:32:03 07/11/00 Tue

> Castor: the angle of the axis between the upper and lower ball joints, measured in degrees. Positive means the wheel is leaning toward the rear, negative means leaning toward the front. O degrees castor the two ball joints are straight up and down.
Castor split: difference between these two angles measured in degrees.
Depending on type of racing (dirt versus asphalt), personal preference and driving style, a good starting point might be 1 positive on the left front and 2 to 4 positive on the right front. The more split the harder the car trys to turn to the left. I have seen up to 4 degrees split and as little as 0 split. There are a multitude of magical numbers and theories for castor and cambor depending on who you want to listen to.

Steve ,
> Right you are about the self steer thing. and..Yes It
> would tend to loosen the car up on entry because the
> heavier caster on the right front would transfer
> weight to the left front.With more weight on the left
> front the diagonal (left front to right rear) weight
> would rise putting more stress on the right rear...
> O.K. Now what happens when the resr end slides out in
> the middle of the turn ? Turning right, to correct for
> the loose condition would transfer weight back to the
> right front and change the diagonal bias to "right
> front-left rear". Now we have a better bite with the
> left rear to help power off the turn and unload that
> right rear that was overloaded into a loose condition.
> Clear as mud ? A lot of caster stagger can be a real
> bear to drive without power streering. trying to turn
> the wheel right in the middle of the turn(to correct a
> loose rear) would require actually lifting the right
> front with the right front spindle.We are talking
> dynamic weight here, not the static weight we measure
> on the scales. The steering effort could reach levels
> that a driver just couldn't handle.(Me for one !) I am
> a small person and I have little upper body strength
> and prefer to sit back a little from the steering
> wheel. You might have too much caster stagger if your
> car is always going from one exteme to another through
> the corner (Loose in-Push off).Lots of things can
> cause shifting of weight though. I agree, If you have
> about 3 degrees total caster stagger, you should be in
> the ball park. If you have much more than this, you
> might want to experiment some with less.Drver feel and
> preferance DO come in to play here.By that I mean,
> check lap times, don't go by how good it feels.
>
> Good luck, go fast and turn left ...with caster
> stagger.
> Dave

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