In Reply to: ALL ANSWERS TO THIS QUESTION. (long) posted by Justin on February 02, 2001 at 01:24:39:
11.801 @119.36 1/4 mi, daily driven, plain m3
moderator @ bimmerforums.com e36 m3 section
Here are all of the answers to some things that you said, why they happened, and how to avoid them!
Then next thing I feel the back end starting to brake loose. I countered steered and the did a reverse 180. Let me explain this part. It was a left hand turn so I felt the
back end coming around on the right. I put on the brakes and
countersteered this is when the car's rear end swung back to the left. The rear end swung 180 degress so I ended up facing the wrong way on the road.
Steering into the turn is the right thing to do, so good job. Your problem was puting on the brakes. NEVER put on the brakes until you feel that a spin is completely unavoidable. If this happens, lock the wheels (This won't stop a spin, but it will make the overall direction of your spinning uniform so others can predict where your car is going)
The problem with putting on the brakes, or even lifting your foot off of the gas too far, is that this shifts the weight forward OFF of the rear tires and onto the front tires. The rear becomes more squirrely, and you SEVERLY overseer. Someone commented that the springs then shoot you the other way so you spin the wrong way, entirely correct. (In fact, in any fish tail, if you don't straighten the wheels and when you recover, the car will spin faster in the opposite direction)
Anyways, what's up with the ASC. I thought this is what is was for to stop the oversterring?
ASC only stops wheelspin, so it will HELP to stop oversteering with THROTTLE, but that is all. Nothing else.
I took out my spare tire, now shouldn't this cause more understeer instead of oversteer (since I took some weight off the back end?).
Actually, the exact opposite is true. In doing this you are making the rear end too light, thus it looses traction. When you said that you may have confused this idea with porches, you are right for 2 reasons: Some Porsches have a near 40/60 weight balance which means that the rear is so heavy that it gains too much momentum and causes oversteer.
Reason two is that Porsches are know for TTO, or Trailing Throttle Oversteer. This is a phenomenon caused when you enter a corner at high RPM and lift you foot off of the throttle. You all know that this is like putting the brakes on ONLY the back wheels (Due to the compression of the engine) so the car transfers weight forward OFF of the rear wheels, and swings all of that heavy rear end around to the front. (It's like putting on your parking brake when you're going fast. Try it and you will understand.)
Also, the pavement was absolutely dry. I have already learned my lesson about driving fast in the wet.
Doesn't matter...driving principals are pretty much the same in the wet as the dry... just slower.
Next time the rear breaks loose do the following:
CPR-Correct, Pause, Recover
Correct- Steer into the slide (you did that)
Pause- Keep the wheel turned this way until the slide stops (You did that)
Recover- When the rear gains traction and wants to "snap back" straighten the wheel again so that the car doesn't spin the other way (you didn't do that)
HOW TO PRACTICE- On a wet or icy parking lot, put the car in 2nd and drive in about a 50ft diameter circle as fast as you can (not fast at all when it's wet) without the car sliding. Floor it as fast as you can (Just a tap, then back to normal throttle...a "blip") in order to cause the back to break loose. Steer into the slide and practice the CPR technique. Try to recover the car back into the circle. If you think you will spin, remember: "All-in" (Clutch and brake to the floor)
Any questions just email me at [email protected]