Originally posted by jrrc
Somebody was asking about a spool for the Pro4. Get the Losi spool pads for the xxx-s and follow the instructions. The pads are just sandpaper cut to the size of the diff rings and you leave out the diff balls.
I ran the one-way and the spool at the Nats. Lap times were about the same, but much easier to drive with the spool. Also had brakes to make passing easier.
My car was one of the fastest in the stock class. With the spool I could run less rear toe in (1 degree) for more speed on the straight. Also the tires didn't overheat as the spool makes the car go around the corners with very little sliding.
Do you leave in the diff rings? Also, which instructions are you referring to... Hpi's or Losi's?