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Motorsport Wheel Alignment Fundamentals

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How does running toe-out on the front of the vehicle help to overcome understeer?

There may be some confusion there, I'd suggest you do some reading on "Ackerman angle", and if you still have questions reply with a bit more detail on your specific question.

"Toe out" will normally promote understeer, as it reduces the total available grip remaining for lateral loading.

Andre mentioned that toe-in directs the tire direction towards the center line of the car, thus resulting in more understeer which is desirable for passenger cars. Whereas toe-out assists in improving/easing the turn-in

Hi Pippa,

Normally when people talk about adding some toe-out to the front axle, they are doing this to help with initial turn-in. I wouldn't say it is used to actually affect the steady-state (mid-corner/skid pad) balance.

It is most effective by helping during the very first part of the initial corner turn-in, what people sometimes refer to as transient turn-in. It tends to help make the front of the car feel a little more reactive and responsive to the initial steering wheel input. This is because it's helping the inside front tyre give you more initial yaw moment (turning force from the front axle) before most of the weight transfer has occurred. Once you start to build more lateral acceleration and most of the weight has been transferred from the inside to outside tyres then the inside front tyre isn't generally contributing much of the lateral force anymore.

Hope that helps!

Tim