Warning! Science Inside! Tire Friction Coefficient

[ccracin]

I'm sorry to get all technical but I am curious. Has anyone found or determined an average coefficient of friction for the typical performance street tire alot of us are using on our vehicles? I have done some research and it seams published figures are in the neighborhood of .7 to .85. This doesn't make sense in that 1g plus of cornering force would be difficult if not be possible on "Street" tires if this is the case. Has anyone recorded 1g+ on "200 Treadwear" tires? If not what is the highest you have seen? Another way of looking at it, is has anyone recorded -1g or greater in braking?

This is really where I am interested. I am playing with picking brake components and have found some interesting things along the way. There are so many factors that affect brake balance it is staggering. So let's hear it, anyone have real numbers?:popcorn2:

[Ron Sutton]

That's outside my wheel house.

Hopefully a knowledgeable race engineer is on here to answer that.

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[ccracin]

That's outside my wheel house.

Hopefully a knowledgeable race engineer is on here to answer that.

.

Aww, come on Ron. Let's spitball a bit. I'm basically talking about the circle of adhesion. So, theoretically it would seem that if your coefficient of friction for the tire to the road surface is 1, then the maximum possible deceleration or acceleration or any single direction traction force would be 1G? Yes/No? I know there are tires available with COF on dry pavement or concrete above 1. That's mostly in the racing world. I wonder in street tires if the 200TW that seems to be the requirement for Goodguys, ASCS, and some others are capable of COF >1?

[Ron Sutton]

Haha ! :lol:

Chad, you have me confused with someone that "wings it" or deals in hypotheticals. Not me. I don't know much about this area because I never had the need to calculate it. That's an engineering exercise, for sure.

But if someone knowledgeable comes on to discuss it, I'll pay attention.

Take care!

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[ccracin]

Haha ! :lol:

Chad, you have me confused with someone that "wings it" or deals in hypotheticals. Not me. I don't know much about this area because I never had the need to calculate it. That's an engineering exercise, for sure.

But if someone knowledgeable comes on to discuss it, I'll pay attention.

Take care!

.

Drat! Hopefully someone will chime in. I'll be hanging out at your tuning thread! Good stuff! :thumbsup: