M3 with new wheels and tires by
dcstep, on Flickr
18x10" 19-lb Apex ARC-8 wheels with 25 offset, 275-35/18 Dunlop Direzza Star Spec tires (square set up) 4.10 final drive, Dinan springs and camber plates with -1.8-degree camber up front and 1.5-degrees in back. Tire pressures, 27 cold in the back and 34 in front.
About tire pressures, AX is more about traction under acceleration and manhandling the car through corners by trail-braking the car on its nose. Low
TP in the back (combined with appropriately wide wheels) give better acceleration than high TP. Low pressure in back also helps the car to rotate in tight corners. You want enough TP in front so that you don't roll the tires, but that'll depend more on camber and wheel width, than temp and pressure. Usually, if you do find a big sweeper on an AX, it'll be midway through and your tires will have gained several pounds. I used to run the stock 19" Michelin setup with TPs very close to what I use with this wider setup and it worked great. 40-pounds will reduce acceleration and reduce tire effectiveness, IME.
Dave