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Old 11-02-06, 06:46 PM   #66 (permalink)
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ross nicol
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Re: Rear suspension bump steer

Chris
I can't go along with a lot of this. Just a couple of points I have a problem with. When you near a corner at the end of a straight and throw on the brakes the car's weight transfers to the front, the rear goes light and if brakes are biased too much to the rear they will lock up the rear wheels. In an extreme case you will spin. At this point you are not turning the car either so toe effects at the rear are not an issue. Now as you turn in the car's weight transfers to the outside wheels and toe on that highly loaded rear is extremely important. If you have any toe out on that wheel it will steer outwards which is the opposite to the steering your putting on the front.It is necessary to set enough rear static toe in for the previous situation to never occur, and from what you say you have done this.Lightly loaded inside wheels which are generally in rebound (in a corner) play a much lower part in the grip and handling stakes, to a point you wouldn't care about the toe settings on them. It is good to hear the owners of road cars getting into this to get a safer set up, as toe out steering of the rear is an unstable condition and a road car driven hard into a corner could experience it, unless the tyres lost their grip first.
Ross
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