Thread: Short Pump! Long Pump!
07-08-2010, 06:13 AM #1
Short Pump! Long Pump!
Anyone have any back to back experience with the short vs long pump on a GPRXP? Looking for info like handling differences overstuff problems with the short pump without valves? Holeshot gains/losses top speed gains/losses.
07-17-2010, 07:09 PM #2
-easier to adjust your rideplate of choice, and no interference.
-I noted while riding Woody's two years ago, that his turned very easy compared to my long setup. It wasn't apple/apple, but I was still impressed.
-If you have a stuffing issue, drill the holes in the pump shoe. This will take you into the mid-80s.
-No difference seen on the pump pressure IF the rideplate angle is the same. The rideplate angle is a much larger knob than the pump length.
-Ski keeps it's nose attitude way, way better across the tops of rough water, hence the feeling of better pump refill.
-Turning is more progressive... Very small changes at the edges of the turn are way more pronounced then when you first turn the bars.
-Not much difference between old style, and new style pump with the 2" extension. Maybe 1mph...maybe. On a stock gprxp it might be a better choice.
SD 75mm extention conversion (same length as Long pump)
-Holeshot is much harder.
-Turning is very, very good. However, the progressiveness mentioned above is worse... it turns on a dime out on the edges. You ride it hard, she turns hard.
-Pump pressure at 80mph is only 40psi on a 12r grate with no pressure relief. I'll have higher numbers shortly.
-Rideplate clearance is worse than long pump.
-SD nozzle has been known to snap off...the whole nozzle It needs reinforcement.
-Still not very affordable.
07-17-2010, 08:28 PM #3
Thanks good info Mark. I have a few tests coming tomorrow.
10-05-2011, 05:37 PM #4
- Join Date
- Jul 2009
how does an xlt hull respond to an extended pump? also is there a difference with the small hub or large hub ho pump stator?
mr-1 4 stroke swap in an xlt hull. looking for best setup
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