So we were out in Glamis this last weekend doing early season shakedown runs on the RZR’s. I have a turbo xp900 running STU 26" #2 full paddles comp cut, 12 psi boost about 130hp at the wheels. Racing buddy’s xp1000 up Olds and noticed that I accelerate faster up the hill at 1/2 to 3/4 throttle than at full throttle. Clutch is tuned almost spot on, only tap the rev limiter at top speed on the flats. I can only assume that I am getting too much wheel spin at full throttle and not gaining speed and when I ease off the throttle a little it starts to accelerate.

What do you think, just tire spin or could something else be causing this?

Thanks