[Timberwolflt]

I wish I could help...

The stiffer spring won’t necessarily cost you top speed... but there will be an rpm cost. The stiffer spring in the secondary makes your motor work harder to get to the tall end. If your primary won’t push the belt to the tall end of the primary... you may have to increase your max rpms to push it up there... the cost being the lifespan of the motor.... or you don’t work your motor harder and accept the speed loss.

I think I’d increase the torque... accept a little speed loss... and be happy going fast down the track only one direction