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Understeer
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Posted by glax (more from glax) on Mon, 2 Apr 2001 23:49:54 Share Post by Email
In Reply to: Road Trip Report and Questions, Lola, Mon, 2 Apr 2001 16:11:18
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Front drive cars have a tendency to understeer since the front wheels have to both propel the car and steer it. RWD cars tend to oversteer. Here's a little more technical definition ( I say a "little" more because I've read some that I don't even understand!):

Oversteer is when the rear wheels are carving a larger arc than the front
wheels or the intended line of the turn. Rear "slip angles" exceed those of
the front tires. This is often described as a "loose" condition, as the car
feels like it may swap ends, or be "twitchy."

This condition can be caused by "power oversteer", where you need to
reduce power in order to bring the back end back into line.

Understeer is when the front wheels are carving a larger arc than the rear
wheels. This is often described as "push" or "pushing" - as the front end
feels like it is plowing off of a corner.
Further acceleration only compounds the push, as weight shifts back to
the rear drive wheels off of the front turning wheels, leading to a further
lessening of the car's ability to turn in.

Understeer can be remedied by slight modulation in throttle to transfer
weight forward to the front wheels, aiding their traction and ability to carve the turn.

Many cars are designed to have a tendency to understeer. If the driver gets uncomfortable and "lifts" off the gas, that will cause the front end to tighten the curve - a relatively safer, and more predictable condition.

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