Bump steer

[Martin]

Hi I have been trying to get my GT40 to stop wandering and get rid of the bump steer at high speeds ,I watched this

and made one up myself and found I had over 15mm bump,I moved the rack up 25mm and got rid of it all,what a difference to drive.Such a simple thing to build with big results
Check bump steer

 

[Terry Oxandale]

Thanks for the video. One obvious thing that I should know, but didn't think much of when I was doing this same thing with my project, was the caster effect in raising/lowering the steering arm. Obvious when one thinks about it, but was not in my obvious thinking when I did my work.

 

[Martin]

The gt40 is so light on the front (when we turned the wheels on the alignment machine the pad didn,t move) .I ended up draging my caster way out to 7 deg Pos ,now I can let my hand of the wheel and it just goes as straight as,been a street car I need it safe on the highway,it handles like a modern car now.

 

[Doug Dyar]

This is a fantastic thread. Thanks for posting. Beats the heck out of the climate change thread.

 

[Jim Cowden]

You don't have to make it that complicated.
If you shoot the laser 90deg out from the wheel onto a target (sheet of paper).
Draw a centre line on the paper ,pump the wheel up in the working range any deviation off the line is bumpsteer.
Adjust to the minimum amount of deviation.