Ian W

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. <p>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. <br>

Stu Raike

To the effect of...understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the back end.<br>

klidge

That's very good, Stu!

Bill Shaffer

The Porsche 911 suffers from "lift throttle oversteer" This is the antithesis of what you describe. I don't have a better understanding of it than you, I just think we're all going around talking about stuff we rarely actually expierence.<p>Bill

Cathleen

I HAVE driven RWD on a track but have never experienced a severe oversteer in one (yet), but I was told (by those who know) that if the back end gets loose on a RWD in cornering that you DO NOT LIFT or you are going for a spin. Instead you should press harder on the throtte to get it back in line.<br>I have had an oversteer that resulted in a 180 spin off the track in a Quattro which has, of course, some RWD characteristics. Unfortunately, this instance WAS caused by too much throttle input, too soon, on a greasy-wet apex. So more throttle was not the answer.<br>'Seat time' is what helps you to get the feel of the proper reaction based of conditions and situation. Then you can 'feel' and have the proper gut response. Remember, though, even first-rate race car drivers spin......no one is completely immune.<br>-C.<p>

John/TSR

Oversteer is oversteer, whether it's from too much throttle or too little throttle. Ian's explanation was excellent.<p>TTO (trailing throttle oversteer or "lift throttle oversteer") is a characteristic of rear engine cars, and older 911's in particular must be driven gently when coming off the throttle when turning. <br>Any car will develop TTO if you snap out of the throttle abruptly in a corner, if you're really leaning on the suspension. <p>How to fix oversteer ? <br>FWD - Stand on the gas<br>RWD - (if caused by a throttle lift) gently squeeze power back in<br> (if caused by too much power) gently back power out<p>Recent 911 editions don't do it very dramatically, so much of what you hear is just 911 mythology. A well set up car can be steered with the throttle almost as much as with the steering wheel.<p>John<br>Trained Seals Racing

Ray Calvo

Recovery from an oversteer condition requires a good feel for your car. In a rear-engine car like a 911, countersteering has to be quick (but not too much), you CAN'T lift off the throttle until the car is straight again, and you have to be quick with straightening the wheel again once the back end starts straightening out. Also have to be careful with amount of steering- too much can be worse than not enough. Have seen and experienced spins where the attempted recovery form the initial spin was overdone and the car went completely around.<p>if you want to experience understeer/oversteer, highly recommend autocrossing. You can get the car sideways and learn to recover. Race track driver's education give you excellent theoretical instruction, but no opportunity to learn skid recovery (if you DO get into an off-track experience, you've got a long discussion with an instructor; also high likelihood of doing car damage. Spin once too often and you're sent home for not keeping your car under control and driving within your abilities).<br>

John/TSR

That's racing vernacular for what happens when you miss catching a slide, and spin it the other way due to overcorrection. It leaves a very distinctive "hook" tire pattern on pavement. <p>Most people are reasonably good at countersteering when the back end starts to slide. Where must people suck is in the "pause" and "recover" part, where you have to wait until the front end hooks up, then apply the CORRECT amount of recovery correction so that the car doesn't go the other way. This second slide is really very violent, as the rear springs are unloading from your first slide, just at the very time that your front wheels are probably pointed in the wrong direction just as they start to steer again. THAT'S the neck-snapping part of a missed slide recovery.<p>The most valuable time you could ever spend in a car is on a wet skid pad, or on ice. You'll learn more in 2 hours on a skid pad than you've learned in 20 or 30 years of driving. Skippy Barber's 1 day "Car Control Clinic" (if they still call it that) is well worth the time and money, if you don't want to drive like a ******.<p>John/TSR

Dank

!

Greg Slater

The constant rain will give you PLENTY of opportunities to get used to the feel of your car sliding around. I saw a newbie guy two years ago in a brand new RX-7 lift suddenly at exactly the wrong time, and then (poorly) attempting to correct, leaving a nice "hook" pattern and a nice dent in his passenger-side door from when the car eventually stopped against a pole for a chain link fence.<p>Or, you can grow up in the sticks in Oregon like I did, and hope you have a bunch of neighbor kids with VERY fast go-karts. Learn how to catch a slide at age 10, and it'll be permanently burned into your synapses...