Lower preload, increase coast?
IIUC, 'Preload' effects the transition between coast & power diffs. I would imagine this wandering was happening in the middle/end of straights, so unlikely that preload would have any effect. And if it did, a higher preload number leads to a smoother transition, so to lower it would just cause a more violent reaction.
Again with coast, that's when your foot is coming off the accelerator, not when it's planted... so again I'd think this is unlikely to help.
If still not working either try decrease front toe-in (towards positive) and/or increase rear toe-in (towards negative).
I agree that a +0.2 would be more likely to help then a -0.2 for front toe, I'm sure I tried that when we started with that car & I don't recall it helping
.
While at the back, I've always been of the understanding that a rear toe measurement of +0.2 would do less wandering then a car with 0.0 rear toe... not the other way around.
My suggestions of things to try one at a time would be:
1: Make
rear toe a more positive number (i.e. +1.0 might be worth a try, if it works you can slowly reduce it down).
2: Try increasing
front rebound & decreasing
rear bump to their maximums. If no effect, then you can disregard them & if it's worse, go the other way.
3: Try increasing
front springs & decreasing
rear springs.
4: Try increasing
front ARB & decreasing
rear ARB.
5:
Power diff, I can't decide if lowering would be better or raising. Try on 100% & try on 5%, see if either has any effect on the wandering?.
6: After that, you've only really got
ride height &
aero settings left that effect acceleration.
Having thought about it, I almost fancy jumping back in it to find out myself.
