09-30-2013, 06:30 PM #1
GP1300R Prop question. which one is faster?
I got a GP1300R, i have on me a Solas 13/19 and a Riva 13/20... which one is better for faster speed?
09-30-2013, 06:36 PM #2
Its not a matter of which one is faster, its more about what your craft will spin in the correct rpm range... depending on engine mods.
09-30-2013, 06:43 PM #3
09-30-2013, 06:54 PM #4
With that one I would try a 13/19 concord impeller. You may be able to turn the 13/20, but depending on your climate, maybe not. You probably still have an 85mm exit nozzle, so you can look into an 87mm if you need to get the rpms up. You are shooting for around 7100 to 7200
You dont really need the controller, but adjust it to 5517 and let it fly. I would add some waveeaters to the list of must do mods, and add a tach if you want to properly tune an aftermarket impeller. Tiny tach is a good cheap tach option
09-30-2013, 07:33 PM #5
thing is, I JUST installed the riva grate... It had a stock grate with a 14/20 prop which makes NO sense to me, why add a prop when u are starving the pump for water... i havent tested it on water yet.... i assumed i had a stock prop since i had a stock grate. this is a ski i recently purchased. so im sure you understand where im coming from... for all i know with the grate the ski should be able to FLY now.
09-30-2013, 08:46 PM #6
Actually the stock grate will give you more water than the aftermarket, but the aftermarket it is needed for handling and safety.
I would say get a tach on there and get some baseline numbers on what you have already.
Also just because the impeller may say "14/20" doesnt mean it hasnt been repitched.
10-02-2013, 11:56 AM #7
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