JMLegacy Posted April 26, 2017 Share Posted April 26, 2017 Tire Pressure in the Rain For both autocross and road racing, increase tire pressures 6-10 psi from what you would normally run in dry conditions. Hydroplaning occurs when a wedge of water develops between the tire and road surface. This wedge can actually lift the tire off the road and eliminate traction. Increasing the pressure rounds the profile of the tire by decreasing the deflection of the tire. This results in a smaller contact patch - narrower and shorter. It also helps keep the grooves in the tread open so they can channel the water out from under the tire. Source https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=58 Link to comment Share on other sites More sharing options...
JMLegacy Posted April 26, 2017 Author Share Posted April 26, 2017 As Subaru owners we are more concerned with the "Decrease Understeer" column. Up until now I was of the impression that lower tyre pressures give more grip, but this article shows that an increase in front tyre pressure will reduce understeer. How does that work? Link to comment Share on other sites More sharing options...
quick4dr Posted April 27, 2017 Share Posted April 27, 2017 265/40/17 Toyo T1 sports I run 38psi front 36psi rear and she feels solid all around. -1* camber all corners, max + caster 0* toe all around. Link to comment Share on other sites More sharing options...
JMLegacy Posted April 27, 2017 Author Share Posted April 27, 2017 So..can confirm that an increase in front tire pressure = less understeer? Link to comment Share on other sites More sharing options...
whitetiger Posted April 27, 2017 Share Posted April 27, 2017 So..can confirm that an increase in front tire pressure = less understeer? not always. that list needs to be incorporated in to a larger understanding of suspension geometry, shock damping and tire design. if you really what to know whats going on with your tires, you need a probe style pyrometer and tire chalk. Link to comment Share on other sites More sharing options...
JMLegacy Posted April 27, 2017 Author Share Posted April 27, 2017 I was humbled last night. On a lonely twisty road a toyota avalon was able to keep up with my 300 hp legacy. I just don't have the confidence of cornering in this car, so i had to brake a little more than needed to take the corners and thats when he catches up...Well, that and the turbo lag. Link to comment Share on other sites More sharing options...
whitetiger Posted April 28, 2017 Share Posted April 28, 2017 ^with the right tires, you can out corner nearly anyone on the road. problem is most people dont know what a good tire is. Link to comment Share on other sites More sharing options...
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