Thread: VX Impeller in a GPR
08-20-2008, 04:30 PM #1
VX Impeller in a GPR
I haven't heard much about this in quite some time. In fact, I couldn't even find the few old threads that existed about it, for some reason. For those willing to part with some info:
1)How many are using this prop in the GPR?
2)How does this prop effect midrange and hole shot?
3)What was your previous prop, prop bend, and rpm before changing to the VX?
4) What is your new bend and rpm's with the new VX impeller?
5) General impressions?
This prop was tried on my ski 1.5 years ago and saw a good mph gain, but can't remember the holeshot/midrange/pitch. Any info would be helpful.
08-20-2008, 06:13 PM #2
the little I know is that it is a dog outa the hole and requires machine work to fit. good for mid to topend I was told
Lowell was working with some guys on this and I'm sure woody and others will chime in with findings. pretty sure you will nedd some serious hp to turn the VX
Last edited by dhoad; 08-20-2008 at 06:19 PM.
08-20-2008, 06:31 PM #3
Ive only tried the VX for a short time on my triple.
DF prop-14/25,7740rpm @ 83.6mph
VX prop-18/22,7630rpm @ 85.mph
There are alot of variables though,nozzle size,different air day etc....Cant tell you what its like on a single piper,but anything i stick behind my stroker motor gets punished anyway. The DF prop did pull a harder in the mid.Im sure the VX prop can be bent to give good bottom,good mid range and 1+mph over the DF.Motor size/porting plays a roll in how well a ski will pull this prop also.IMO the DF is the best prop for all around use.
08-20-2008, 06:49 PM #4
Thanks for the replies.
For some reason, I'm thinking that the VX prop that was tried was a 14/21. Is that even possible? It dropped my rpm's into the 7100-7150 range from the Dyna 14/25+ at @7350 rpms.
I'm considering buying the prop (machine and prop @ 470.00)just for speed if I can get a good feel for what the angles should be(i.e. 14/21, etc), BUT keep the dyna for normal playing around.
08-20-2008, 06:50 PM #5
08-20-2008, 07:57 PM #6
The VX is faster on most skis... Holeshot is terrible... From 20mph up mine is a rocket though.. I could only get 80.5 with my dyna no matter how it was bent, with my vx i have been 83.2
Some like bigger exit nozzles, some dont, some like 7300+ rpms, some dont..
As always it takes experimenting with your ski to get the best combo for speed.
My advice would be to talk to dave at impros.. He will get you very close..
IMO, if you wanna go fast, vx is the only way.. Others have went as fast with a dyna, i couldnt make it happen on my ski..
My vx stays on my big bore ski, love it...
08-20-2008, 08:02 PM #7
08-21-2008, 10:44 AM #8
08-21-2008, 10:47 AM #9
Anybody else have experience with the VX prop? (especially concerning BB efi and starting bends)
08-21-2008, 05:11 PM #10
you need a big motor for a VX, if you lower the pitch on the VX it distorts the shape of the blades, so I think it will work best when the pitch is 18/22 or higher
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