Do you not mean over steer?
The front with a wider track will hold better, causing the first point of slip to more likely be the rear (oversteer).
The narrowing of the front, or widening of the rear will push the balance more neutral.
On the road these naturally oversteer as its narrower at the rear. Match the widths an you have under steer. Front engine fwd! Improve the bushes and suspension etc and you can make the front hold longer leaving the rear to let go first... Over steer. It's an ever changing battle but given time and experience driving the thing you can dial it to pretty much however you want it... Personally I prefer the rear to come loose first... It's more fun being able to adjust lines on the throttle without worrying about under steer!
Therefore what chambers runs (plus wide track) should be a very well planted front with an adjustable but still well planted rear. Am I right?
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