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Exceeded the traction circle in 3 different ways on 3 of my tires in a turn this morning...

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Old 04-30-2003, 06:23 AM
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LCP
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Default Exceeded the traction circle in 3 different ways on 3 of my tires in a turn this morning...

...it was that right hand intersection turn on smooth asphault that I flew into at about 35mph again. The first tire to start sliding was the outside rear. Then the full torque of 2nd gear hit, and that outside rear started to spin as well, so power gets transferred up front to where the front outside is at its limit of cornering traction and it starts to slide and spin simultaneously, and then finally the inside rear tire starts to just spin as the car jerks around a little bit as each of the four wheels struggle for positive traction and balance cornering forces and steering inputs. That was kind of interesting, and the cacophony of tire squeals was great. I wish I had a computer animation of what was going on with the drivetrain and traction circles of the tires at that time.
Old 04-30-2003, 06:27 AM
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Default at only 35mph?? what was the posted speed limit for the turn?

right hand intersection so i assume just a 90 elbow turn?
Old 04-30-2003, 07:19 AM
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90 degree elbow, commonly taken at about 15mph by most.
Old 04-30-2003, 04:10 PM
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Default Re: Exceeded the traction circle in 3 different ways on 3 of my tires in a turn this morning...

How do you know you did this?
Do you have any tire data?
Just curious because i would like see it.
Old 04-30-2003, 05:22 PM
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Default Well, I know 3 different tires were sliding...

...since I could hear and feel each of them distinctly, and if they're sliding, they're exceeding the available traction.
Old 05-02-2003, 04:00 PM
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Default Re: Well, I know 3 different tires were sliding...

Actually, the traction circle is a plot of lateral and longitudinal acceleration. If the tires are 'sliding' (extreme slip angles), you are well inside the maximum lateral acceleration of the car.
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