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Sanity check on bump steer


Joe 90

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I've just measured the bump steer at 0.2 degrees toe in per inch of bump (per wheel). Put like that it doesn't sound too bad, but going from full droop to full bump I nearly ran out of travel (all 12 mm of it) on my dial gauge *eek* According to my Allan Staniforth book I now need to raise the steering rack. Can anyone suggest by how much, or am I stuck with trial and error *confused*

 

About to unpick the wiring loom

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I think the track rods should be have an angle that is proportionally split between the top and bottom wishbone angles, so setting them horizontal is not neccessarily beneficial. Anyway, a bit of rough geometry suggested 4.5mm. I tried that, but it wasn't enough. The height which gives zero average bump steer is 6mm, but I think I'm only going to go to about 5mm so that the curve is always positive.

 

About to unpick the wiring loom

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