I'm currently running a d3.5 with the 12.5 high torque rotor. I have run it with the standard 12.3 broad powerband rotor as well. Both combinations are quite quick, but I was able to gear up slightly and turn the timing down a bit with the bigger rotor. The car also seems to carry the laptimes deeper into rhe run with the HT rotor. I did add a little "roll" to the car to overcome the drag brake effect.
The Reedy and Thunderpower motors also run quite well.
Team CRC, Access Race Place, US Indoor Champs, CD SUPERPRO, RK Designs, Cypress, Founder and lead instructor of the Ian Ruggles Negative Reinforcement Driver Training Program, enroll now.....