I am using this setup tool link. Then doing some changes or rounding to the next # examples below. Tires: finding the sizes using Forza 2/3 or ex. Tire Rack Aero: just add the value using the metric scale. (I adjust the aero if need for turns, I will add aero to the front to compensate some for caster at high speeds) Transmission: "the tranny trick" (I did try using the trans calculator at gtplanet) LSD accel./braking: FM3 setup/GT5 0/5, 10/10.5, 20/16, 30/21.5, 40/27, 50/32.5, 60/38, 70/43.5, 80/49, 90/54.5, & 100/60 Suspension: Ride Height - I will lower front and back evenly to max or 3 clicks above minimum, I am still testing. Springs - Divide by 56 for the imperial. Rebound & Bump -FM3/GT5 0/1, 1.3/2, 2.6/3, 4.0/4, 5.3/5, 6.6/6, 8.0/7, 9.3/8, 10.6/9, 12.0/10 ARB - FM3/GT5 1/1, 7.5/2, 14/3, 20.5/4, 27/5, 33.5/6, 40/7 Camber - just add values from the FM3 setup tool Toe - example: FM3/GT5 Front +.2/Rear -.1/Front -.02/Rear +.01 I have found some cars, where I needed to add to the spring weight to get above the GT5 minimum spring settings.