off topic / traction control

[Pat Ford]

 depends on the car, the tire, and the rim size. In most of the cars I've driven 40 psi wont let the outside edges of the tire contact the road. For example at 36 psi 215/70/15 tires on a 92 tracker 2 door only the center inch was touching the road ( measured using the puddle method) and the car was scary. On a 87 Subaru 4dr 4x4 sedan 36 psi gave about the same contact patch.

 The best tire pressure is a trade off between wear, and traction, and ride. The tire maker sets a pressure that makes the tire last longer on the test stand, to automakers give the pressure for best economy with handling factored in as small
part.

 The only solid rule I've found is that you have to test.

Previously, you (John Edward Miller) wrote:
{ > Normally, you lower tire pressure for traction
{ 
{ </LURK
{ 
{ Not cornering traction, not on street tires.  Best grip ~40-46psi in most 
{ cases.
{ 
{ John.
{ 
{ <LURK>
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--
Pat Ford                           email: pford at qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

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