10-06-2012, 01:34 PM #1
- Join Date
- Aug 2007
Advice on 12 rxpx and speed and RPMS
Okay 12 rxpx, 4 inch intake, 8250 vtech tune and 15/20R prop. I am getting 71 consistently Rpm is solid at 7800 with spikes up to 8200. But mostly solid at 7800 when hitting 71-72 mph.
Do i need a repitch? if i repitch will i get a few more Mph?
10-06-2012, 05:04 PM #2
- Join Date
- Aug 2010
I was in the same boat as you...started with the 8350 tune and best speed of 71.5 at 8340-8360 rpm. Added an untouched 15/20r and rpm dropped to 7800 with speed of 72. Added a 4 inch intake and picked up 150 rpm and a little speed. Sent the prop to Eric at speed freaks and he repitched it...end result was 8300-8340 rpm at 75 mph. Eric said prop pitch was all over the place...I think he repitched it to a 12.5/19.
10-06-2012, 06:23 PM #3
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