I was speaking with a TireRack tech about tire pressure suggestions for the Avon TechR and he guided me to their section on Tire Tech. I noticed that what they are suggesting rear toe IN to decrease understeer and rear toe OUT to decrease oversteer. I didn't argue much with him, but its wrong. I tried to explain to him that having rear toe OUT "steers" the car in the opposite direction of the turn, therefore increasing oversteer, regardless of FWD,RWD,AWD.

I just seems that people may have to learn a hard lesson if they use that suggestion.

Godspeed.

--Wayne

Hey, TireRack will sell a lot more tires that way. Continuing to dial toe-in will wear pretty heavily on those rear tires. :D

nm, got confused... which is what I think happened to them.

Here's the link (http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=58)

That is wrong. The easiest and most accurate way to look at toe is as a slip angle. The definition of understeer is more slip angle at the front than at the rear (and vice-cersa for oversteer). Toe out = more slip angle, toe in = less slip angle. This applies up until the point where you have so much toe that the inside wheel is dragging.

They also recommend decreasing rear tire pressure to reduce understeer. I've always found that increasing rear tire pressure (which decreases the size of the contact patch) decreases understeer.

Well, I've learned that decreasing the rear tire pressure allows the sidewalls to flex, giving you more "progressive" oversteer, and really high pressures in the rear will give you more "snap" oversteer.

Godspeed.

--Wayne

Traction versus pressure is a parabolic curve. You cannot generally say that an increase in pressure will increase traction or that it will decrease traction. It can have either effect depending upon where you are on the curve.

Traction versus pressure is a parabolic curve. You cannot generally say that an increase in pressure will increase traction or that it will decrease traction. It can have either effect depending upon where you are on the curve.
I just called mine a bell curve...but parabolic curve sounds more interesting. :)

-Biggly

(Oh wait, that was in a different thread today, not this one after I scrolled up)

Traction versus pressure is a parabolic curve. You cannot generally say that an increase in pressure will increase traction or that it will decrease traction. It can have either effect depending upon where you are on the curve.
Ahh...of course. I've always been on the downhill side of the curve, trying to keep my soft-sidewall tires from rolling over as I drive into corners carrying WAY too much speed. :devil: :(

Here's the link (http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=58)
Thats the best link ev4r. :lol: