08-10-2012, 10:02 AM #1
Fuel range GP1300r vs GPRXP ? Which one will be faster?
Where I normally ride my new to me ported GPR , if I leave out with full tank of fuel and just cruise 50-70 mph with maybe 1 or 2 full throttle runs for under 1 min to get juices flowing, I usually have to reset fuel beeper when coming in the last couple miles. On new ( to me ) conversion ski will I be able to travel same distance at same speed without worrying about fuel ?
I'm getting pretty excited about getting the project in the water now that I've heard it fire up. Yesterday sent my jpipe to danny for innovate afr bung addition (didn't want to risk drilling my 06 manifold) and working on external IC bracket. Should be ready to put in water in week or so. Below is all the information from ad when I bought the gprxp I'm guessing it will be as fast or faster than my ported single pipe gpr
I know its just keyboard racing at this point till it is in water, but any idea on what top speed would be once its all tuned in? What are thoughts on the 15/26 prop and 90mm sho nozzle? Good starting point or should I go with less pitch and different nozzle?
This was DrewNJs old hull and was set up right.
02’ Hull w/ narrower 04’ Seat
New Pro Taper bars and risers, Oury grips
New Holeshot kit (jetworks valve)
Pump tunnel reinforced
New Updated pump/Plate brackets
New Pressure relief
New Updated front grate bracket with rear drilled/tapped to M8
Pump properly sealed and hull mildly trued/cleaned up
New hydroturf with all holes blocked
New Leo’s holeshot kit
Versi Plug drainplugs
05 rxt gas tank installed
flat black painted fairings
SHO steering nozzle custom bored to 90.5mm
New Pressure relief
cut metal trim tabs
new Hydrotoys conversion motor mounts
new Addicted driveshaft
new TDR waterbox
all wiring, MPEM, and all electronics
gauges and harness
Fully built by Nils Castillo- I have full receipts from Nils. roughly 20 hours on engine before it was installed. This is a similar engine that was in Jerry's Nilamonster. When this engine was built, Nils had used pretty much all new parts to build it- as seen on the reciept.
Fully built Rude valvetrain
JE forged 9.5:1 pistons
Rotax Racing cam
lightweight Rude valvetrain w/ upgraded springs
upgraded flywheel bolts
fully ported cylinder head work
Riva open loop cooling setup
stock ECU, X-charger, 42 bosch
rrfpr and innovate afr gauge
External intercooler with dedicated water feed and dump
08-10-2012, 10:33 AM #2
Funny looking at how deep I got into these jetskis in such a short amount of time. Only a few months ago I was dropped into a yamaha dealership and spied a 2011 VX cruiser. "that would be a fun ski to own" for the family, not too fast, not too slow but should be reliable and fun. Didn't pull the trigger because didn't want to spend 10k on impulse buy for a new ski. haha Somehow my path hit a major detour with recent addition of these 2 gpr's and have spent close to enough $$ ( and still spending ) to have gotten a new FZR haha
My wife is proud of me for saving $$ and getting used skis instead of the new one I wanted. Haha if she only knew how much the parts really cost and everything isn't "uhmm about 15 bucks, honey" ( I have no clue how she got that idea that a candoo or rrfpr only costs about 20.00 ) If she ever questions me on it I'll inquire about her shoe budget. She has a walk in shoe closet that would make Imelda Marcos jealous so pwc parts are fair game
08-10-2012, 10:50 AM #3
Tuned properly, the GPRXP will get way better fuel economy. It will also get better fuel economy than a RXP or RXPX with the same mods because of the hull design.
I would say the GPRXP will be faster, but it could be close. The GPRXP should run close to 85 if its properly set-up with an X-charger. Some of those tripple pipe GPR's are silly fast !!!!
What kind of pressure relief set-up are you running? Just want you to be safe and not get killed.
08-12-2012, 06:08 AM #4
08-12-2012, 06:48 AM #5
- Join Date
- May 2007
- Auckland, New Zealand, New Zealand
Here is a good pic of the type of valves we all run now. Some people run 1, sum 2, I run 3. Don't ask me why! 1 inch Brass Well Check Valves. You might have to at least upgrade the size of fitting in your pump and increase your hose size, in an effort to flow a little more volume.
08-12-2012, 07:13 AM #6
I can do 55 miles, running 50-90mph most of the time and use about 10-12 gallons on my conversion. Once you get it running you are going to have to spend some time setting up the ski.
08-12-2012, 10:17 AM #7
08-12-2012, 11:00 AM #8
- Join Date
- Jun 2008
- GREECE ATHENS , NAXOS
08-12-2012, 11:40 AM #9
Its easy for me to see whats going on. The guys running around 80 are using 1 80-87 seems like most run 2 . The guys running faster than 87 are running 3, so its obvious to me the more check valves you run, the faster you go.
If you add 4 more check valves no doubt you will be the first to average well over 100 in bridge to bridge run. I only ordered 2 because I'm not ready for the speed 3 or more would bring.
08-12-2012, 12:19 PM #10
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