[rpm]

a rule of thumb that you want 1/2 the caster as your SAI. IE, 4 degrees of caster for 8 degrees of SAI, 5 degrees of caster for 10 degrees of SAI, etc.

I'm no engineer, butt I've read in a couple of places that for a road race car you want around the same degree for the caster and SAI.

I love this thread.

 

[rpm]

I can get 8° caster pretty easily.

 

[rpm]

How much total have you lowered you UCA from factory? Inquiring minds want to know. I can also easily get +7º caster with SoT's front end, but how much caster is too much? My friend Nick says thats not possible but it must be.

View attachment 878347

I currently run the upper arm with the standard one inch drop. But I also have it drilled for a two inch drop, which I've also used. It handles great at either location, but the two inch drop requires the steering tie rod to be mounted much lower at the spindle to reduce bump steer. I hate that term for our cars, straight axle cars have true bump steer, ours have bump toe.

How much caster is too much is the $64k question. The more caster you have, the lower the steering tie rod connection at the steering arm of the spindle will go, which affects bump steer, and will need to be adjusted.

You change one thing on these cars and it affects 3 more.