here is my setup for asphalt
Spring- Associated Red
Castor-2 small kwik clips
Tires-Sorex 36r With Blue Inserts for day & Cs-27 at night (Depending on track temp, 36r-82-98 degrees, cs-27 75-82 degrees) Tires Depend on Track Temp. I Used srex 36r and the whole car stuck like glue.
Castor-3 Med.size Quick klips
Gearing- 17t pulley, 25 pinnion, stock spur
Hope this helps. This is a p2k2 setup, Car is Extremeley fast. I won got 2end in my first heat and 1st in my seconed heat.
Hope this can help yall out