NOTE: step 1 thing is you should calibrate your controller in the properties settings and follow the windows wizard, step 2 set the steering expo to 10% on the game controller option, step 3 set the throttle expo to 45% on the game controller options, step 4 make sure that your all values are set to zero on your controller.
This will give you a connected feel to the controller inputs so now its time to set up a car that feels the way you want, if settled on front diff 9k, centre 5k and rear 5k, 34 degree steering and then 95% front brakes and 75% rear brakes, give this a go and then fine tune from there, happy new year