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People are asking that question in the TM blogs. Apparently the traction control does that automatically.
I don't know why it still happens in the video where traction control is supposedly off.
(Many types of traction control automatically apply the friction brakes to limit wheelspin. You could have the PEM limit motor torque itself, but then it wouldn't be able to manage slippage on individual wheels)
I don't know why it still happens in the video where traction control is supposedly off.
(Many types of traction control automatically apply the friction brakes to limit wheelspin. You could have the PEM limit motor torque itself, but then it wouldn't be able to manage slippage on individual wheels)
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>> If they are just flooring it, why do the brake lights come on?
Traction control kicking in. I guess it wants to say: "Watch out on me, I'm on the limit!"
Traction control kicking in. I guess it wants to say: "Watch out on me, I'm on the limit!"
Hmm. According to This Car & Driver article they say:
"extremely quick-reacting traction control (which doesn't require brake intervention) because of the motor's ability to react instantly."
So perhaps those brake lights are flickering just when the PEM decides to restrict torque due to detected wheel slippage?
Without a limited slip differential I guess that means that you are acceleration limited by the (rear) wheel with the least traction. Some other systems might let you accelerate quicker with one wheel on ice and the other on gravel. (I am probably oversimplifying the whole situation though)
I'm not sure how the brake lights should react to the traction control, but they should come on when the deceleration is above a certain threshold due to regen.
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siry
Member
It's a bug - it shouldn't happen in that situation regardless of TC on or off. It has been fixed. Some new vids are being posted now.
siry
Member
The culprit has been identified - an overly sensitive brake pedal switch that was being activated by vibration.
For what it's worth, this is probably the most exciting YouTube video of the Roadster that I've seen in a while.
YouTube - VP9 burnout by Mark Vaughn
Sorry, can anyone please tell me how to directly input YouTube videos?
Alex B
YouTube - VP9 burnout by Mark Vaughn
Sorry, can anyone please tell me how to directly input YouTube videos?
Alex B
[y o u t u b e]http://www.youtube.com/watch?v=09LlCKufLtc[/ y o u t u b e]
(without the spaces)
Exciting as in - good thing the roadster didn't fishtail into that oncoming traffic!
I don't think I would want to try that trick with a prototype. Having one wheel on wet, and one on dry could be risky under full acceleration. That driver probably owes his/her health to some firmware guys that did their homework.
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