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lowering the tire pressure increases traction by increasing surface area, but not by as much as youd think, because more surface area just means less weight per square inch, which technically means identical amount of traction regaurdless of contact patch, like if 3000lbs is on a single square inch, itd be the same as 2 square inches with 1500lbs on each. but the world isnt perfect, and its much more complicated than that.
but lowering the pressure and wider tires creates massive amounts of drag. so make sure you have the power needing these tires or they can actually slow you down in the long run. good traction compound and a properly tuned suspension can do wonders without hurting drag.
*owner of 9.5"rims 275/40/18* and they are a bit wide for the car I have them on, I need about another 100hp no joke, before that much tread is really worthwhile. but Id rather have the traction before I add the hp rather than add it and suffer for 5 months.
my 2 cents
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