| MARK W. ARNDT, PRESIDENT |

   
     


J-Turns. A tire was modified by removing the tread and outer belt with the intended purpose of creating a tire that had suffered a complete tread detachment. This modified tire was mounted on the test vehicle and a series of handling tests performed. From these tests some conclusions can be expressed (from SAE Paper 99-01-0120):
· If the separated tire was on the back of the vehicle and the vehicle was turned away from the tire, the vehicle exhibited dramatic oversteer characteristics and was unstable.
· If the separated tire was on the back of the vehicle and the vehicle was turned towards the tire, the vehicle exhibited less understeer and was generally stable. Overall the behavior was asymmetric.
· In avoidance situations, the vehicle required greater steer inputs and produced significantly different vehicle responses if the modified tire was on the rear axle.

In the video presented here a 1996 Ford Explorer is driven up to speed, the throttle is dropped and a 180 degree left J-turn is executed. The vehicle on the left is equipped with four good tires. The vehicle on the right is equipped with a right rear tire modified to simulate a tire tread separation – resulting in a spinout response in the J-turn test.

 

 

 

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