S2K Sideways

well the tires are branc spankin new all around ... so imma align the car once more , whats a good amount of positive castor?

profpin

a bad rear wheel bearings could also be your problem too.. if you accellerate and feel that the rear is giving you side to side movement and when off the throttle, it feels fine.. you might have wheel bearing problems.. also check to see if your rear axle nut is properly torqued..

RACER

Caster

The caster angle identifies the forward or backward slope of a line drawn through the upper and lower steering pivot points when viewed directly from the side of the vehicle. Caster is expressed in degrees and is measured by comparing a line running through the steering system's upper and lower pivot points (typically the upper and lower ball joints of an A-arm or wishbone suspension design, or the lower ball joint and the strut tower mount of a McPherson strut design) to a line drawn perpendicular to the ground. Caster is said to be positive if the line slopes towards the rear of the vehicle at the top, and negative if the line slopes towards the front.



The Helms manual says 6 degree's of positive caster. So if you get them anywhere in between 5 1/2 to 6, you should be good to go.

You see by tilting the front wheels forward, or as in the pic, the line at the top of the wheel is sloped behind the wheel, the more caster you have, the more difficult it becomes to steer you car, but it becomes more stable in a straght line at speed. If hypathetically you put a large amount of positive caster on a car, every time you turned, you would also be changing camber at the same time. The more caster you give it, the more it will resist turning giving stability, but too much is not good either.

RACER

This is an example of positive caster



In my opinion, this is way too much caster. Everytime this motha focker turns the handle bars, the camber is automatically increased. This thing wont turn for shit.

This pic was used as an example. *prolly bad example*

RED MX5

Nobody can help with this until we KNOW the alignment settings.

Get the car aligned and post the before and after specs. If the alignment doesn't fix the problem we can go from there.

From your description this does not sound anything at all like bump steer but it could be caster. Toe is still the most likely cause, with caster being number two on the list, but all anyone can do right now is make stuff up, becaue we don't have the data we need to proceed with the diagnosis. Get us some alignment specs so we can do more than blow smoke and talk smack.