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Re: Hmmm, I somewhat agree but... (archive)

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Posted by Jim Rohn on October 07, 2000 at 13:21:30:

In Reply to: Hmmm, I somewhat agree but... posted by John (PA) on October 07, 2000 at 08:16:12:


I don't think you really have to drive improperly to induce either state. It's more of just how the car is setup.

true for the best drivers, but driving improperly usually results in one or the other

For instance, if you just drove in a perfect circle, without hitting the brakes, and gradually increased speed until the front or rear started to break loose, that would determine if the car understeers or oversteers.

very true

A neutral car would start to slide all four tires at the same time. That's my take on it.

true, and a car with over inflated front tires will start to push or a car with over inflated rears will start to come about

Understeer typically occurs when you carry too much speed into a turn and try to brake and turn at the same time. It's the "plowing" of the front tires.

it's also the slip angle of the front tires that affects the size of the tire patch on the ground. a common mistake is to turn harder once the front loses traction. WRONG. That reduces the tire contact patch and just causes the car to push/slide worse. you actually have to turn out of it or apply braking (left foot) to add weight so the front grips better

Since you are braking and all the weight is on the front tires, it is nearly impossible to turn.

not entirely true, in many instances more weight on the front AIDS in traction, but only if you haven't exceeded the grip and the slip angle

true, hence the bigger rear wheels/tires on the 96+ cars. Corvette did this too in 1993 and Porsche dialed out the trailing throttle snap oversteer in their 911's.

Oversteer is when the rear tires loose traction and the back end "comes around." Too much gas too early out of a turn will induce oversteer. Driving a Porsche 911 will induce oversteer big time!!!

Now go oversteer. :-)!!!!

also called "dirt tracking," *NOT* the fast way around any paved surface.

jim


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