Many cars have been using variable ratio steering racks for a long time, take your pick, Honda (Civic or RS, HRV), Toyota, Mercedes, Audi etc. But take it a step further can combining all of them. Use two racks with one common steering axis input.
standard VGS steering box:
Lets start with toe adjustment, my rough sketch:
Just toe adjustment:
Take it further with using 2 rack and pinions with a non-ratio gear box:
Now combine them:
Instead of ball screws or using two steering racks. You can use a half moon shaped gears since that would have a larger pitch than a ball screw, this before or at the inner toe link connection:
And you can achieve crazy ackerman angles (from an old post):
Will also help understeer because inside wheel is usually too far turned, with this system, you can put less lock (anti ackerman effect) but better because anti-ackerman is set and cannot be adjusted, with this you can vary the steering angle of the inside wheel for each turn. The driver now has good geometry for the low and high speed turns and can vary as needed.
Kind of like using a 2nd brake pedal on the inside wheel to reduce understeer. Old Mclaren days.
The toe system can also do that but it's faster with the variable ratio steering and without all the bump steer issues you would get with that.
It’s the same as the Honda half gear VGS system but no longer before the main pinion, it sits at the steering rack gear toe links. So the motion is still in y-axis since the FIA has banned dual axis. And resolves the bump steer issue.
For a four wheel drive car, or 4 wheel steering car, it also works as traction control.
It does add weight but figuring a mass damper was like 10kg and so was the interlinked suspension. It's not that much.
I call it Variable Ackerman Steering (VAS) or DAS on steriods (banned). But this system should fit the FIA requirements since the steering is still on the same axis but they'll probably consider it under some catch all rule.
Supercharged Ford Taurus SHO 5spd. Sold.