The "Pedal Dance" testing
I don't remember the original post (and a quick search didn't find it...), but someone had posted up a sequence to turn off additional electronics in the car. The sequence is as follows:
- Turn on the car. The car must be FULLY warmed up. You must do the entire sequence within 30 seconds of starting the car. - Pull the e-brake 3 times. Hold/lock the e-brake on the 3rd pull. - Press the brake pedal 3 times. Hold it down the third time. - Pull the hand brake 3 more times. Hold/lock the hand brake on the 3rd pull - Press the brake pedal 2 more times. - On the last press of the brake pedal, two yellow lights should have come on. I purposely used staggered brake compounds to test whether the brake dance does anything; here are my conclusions. - The pedal dance eliminates electronic brake force distribution. - The pedal dance also eliminates the "panic brake" function. - I tried trail braking mid-turn with the "normal" electronic aids off, but without the pedal dance. This resulted in a spin; the car literally locked up the rear brakes. My speculation is that the car recognized the fronts locking up, and put additional force on the rear brakes. The problem here, is that I had purposely put a much lower friction pad in the back, so it kept sending more and more brake pressure to the back, until it just locked. Once it locked, it stayed locked, even though I was not stepping on the brakes. - I tried this again a few more times. Same result. - I then tried again, but with a rear brake bias. This time, pressing on the brakes mid-turn or trail braking always resulted in the car straightening out and/or plowing. - With the pedal dance, I can trail brake or brake in the middle of a turn for rotation just fine, regardless of pad setup. Moral of the story: if you're driving on a track or at an autocross, do the pedal dance! (Remember, ALL aids will be off) All testing was done on a closed course, at the "Balcony", courtesy of Willow Springs Raceway. *edit* From another post: Quote:
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Wow those are some very helpful results!
I'm assuming the electronics go back to normal after you restart the car? I wonder how this was figured out and whether or not we can make it simpler. |
Yes, the electronics go back to normal after restarting the car. You'll need to do it every time you start the car when you want all aids to be off.
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pic of the two yellow lights please?
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I don't know why, but the process reminds me of this.
http://play-this.org/wp-content/uplo...onamiucode.png |
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Does it affect ABS?
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Having experienced the lock up to which you refer in other vehicles, I appreciate this post.
When I read the thread title, I was however expecting to see this old video: [ame="http://www.youtube.com/watch?v=Ts29KKhKXds"]Walter Rohl - YouTube[/ame] |
How is the brake bias with EBD off? I read somewhere that people were worried it would shift with ABS and/or EBD off.
Nathan |
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worked for me, thanks
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