G37 Track/Autocross/Daily Alignment

Whittie

Caster is always positive!

Negative caster would result in dramatic instability, the wheel not returning to center without being directing by the steering wheel and positive camber gain (instead of negative gain) during steering throw.

I like to recall what an old mentor once told me "Caster is faster"

For go-fast applications where steering weight is not the main priority for driver comfort, one should pretty much always target max caster possible. In my situation, with stock ride-height I don't benefit from the negative camber gained by reducing the static ride of the car, so to be able to get my target -2.5 degrees of camber, this meant that with the adjustment maxed out on the control arms 7.4 degrees of caster is all that was achievable. With a lowered vehicle it would be possible to get more caster for the same camber settings, I've seen 9 degrees mentioned on this forum for one track racer.

Rusty

I'll give you a little hint about caster. Cars at one time had negative caster. Some even had a different settings for the left and right. That's the reason I asked the question. I used to do alignments back in the day.

I have the SPL arms too. My settings now are -2 camber and +6 caster. I still have room to go to +8 caster and - 4 camber if I want to.

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Whittie

That was quite a long time ago, when positive camber would generate traction on a very different tyre construction than we drive around on today

The track I used to run a few years ago was 8 right hand and one left hand corner. I had my car setup with different camber and caster left to right to account for the variation. Oval cars also run setups dedicated to only turning in the one direct, so varying setup left/right is pretty common today still too.

I digress, but I do like to spend time working on and thinking about these things.