An 8.5/RSX combo is pretty good, that is what I WAS running in my 2wd buggy. You want to know what's even better? A 5.5/RSX combo! As I recall the 5.5 is not ROAR approved, but if your track doesn't enforce ROAR approved motors...
From my experience you can add timing to higher turn motors to attain top speed, but the more timing you add, the tighter the power band, and "more peak-y" the motor feels. Which for me, can make things difficult to drive. However, take a nice low turn motor with no timing and possibly even the end point turned down, and it will have a much smoother power delivery that is easier to manage.
-W
Last edited by Wanderer77; 08-10-2015 at 06:44 AM.
Reason: typo