Total Lateral Load Transfer Distribution

[dontlifttoshift]

You are giving away all of your camber gain in roll. A tire will make the most grip in negative camber, not flat.

Your wheel rate is too low so you get the above. Spring rubbers are cheap and easy.

Once the suspension bottoms on the stop and the inside starts to lift, your new roll center is the contact patch of the outside tire. Removing the bumpstop is going to make that significantly worse. Stay off the stop and enjoy better turn in.

Roll rates, roll axis distribution, and the rest of the science and math really only matters in steady state cornering. How much of that is there in autocross? You are trying to math your way into a perfect setup for a situation that exists for less than 5% of a run.



Back at the top of this page, read my post and reconcile it with what you just said.

As far as I can tell, each time I raised the front RC, the car pushed more, and the front was stiffer. Each time I raised the rear RC, the car pushed less and the rear was stiffer.

The front pushed after raising the roll center because you weren't loading the tire. The front wasn't stiffer, it just felt that way because you shortened the lever arm between CoG and the RC, but you loaded the tire less. Same in the back. You will have more total grip if you drop the rear roll center. Yes, the car will feel tight because you made your rear traction circle bigger so now we have excess traction in the rear. That brings me to me final random thought.

If we have excess traction, or grip, available in the rear, what can we do? Lets look at the circle.



A tire gives us 100% available traction in any given direction but if we ask the tire to multi task it has to split up that 100%. So there we sit in our rear wheel drive car as the front tires grind away wondering what can we do to loosen the car up. The answer is underneath your right foot. By using the rear tires to accelerate the car, we remove available lateral grip from the rear tires and then we achieve balance. You can pick up the throttle earlier and harder and will carry more speed to the next element.

TL;DR More front spring, lower rear roll center, step on the gas.