Thread: RXP Hi Speed Grate Testing
09-10-2008, 12:12 PM #1
RXP Hi Speed Grate Testing
I did some searching on this, but did not come up with much so I thought I would throw this out for input ...
On RXPs that are running near 80mph or more, has anyone tested different intake grates? Stock vs Riva vs R&D vs Worx ... Or has anyone modded any of these grates for additional speed? I imagine at higher speeds the RXP is getting too much water in the tunnel and that the optimal/modded grate would add some speed. Just wondered if anyone had done any testing on an 80+mph RXP with different grates ...
09-10-2008, 03:54 PM #2
- Join Date
- Jan 2006
- Rydal, Georgia U S A
09-11-2008, 06:42 AM #3
09-11-2008, 07:54 AM #4
- Join Date
- Oct 2005
I thought I remember Dan (JD1) saying a long time ago that above 90mph he was running a Worx grate (probably modified) and the 79mm nozzle. I could be wrong on that. 90mph is a long ways from 80mph though.
09-11-2008, 09:38 AM #5
Elb, I did the same, but I think I lost rpms and possibly speed ... I need to run a little less pitch too, but ... I think as our speeds go up, we need less help getting water in the pump, and doing what you and I did will help takeoff and cavitation but so far it seems to push rpms down 100 or so. I may have a chance to swap grates and test one with different mods and see what happens, but I think our biggest problem at 78+ mph is too much water, and modding the grate and grate angle or trying different grates that restrict the water at high speed will help our top speed a little.
Rex, I think I remember the same ...
09-11-2008, 10:24 AM #6
09-11-2008, 03:41 PM #7
- Join Date
- Aug 2008
09-12-2008, 09:29 AM #8
You want to round the bars on the bottom (water side), knife-edge the top (ski side) ... like an airplane wing. Round where the water hits it, knife-edge where the water leaves it, so it leaves it cleanly.
09-12-2008, 10:40 AM #9
Here a pic of my grate, before i mount it under the ski.
09-12-2008, 11:13 AM #10
I did some test before...got better results with a stock grate....with RIVA grate was at 78.8....stock grate cam up to 79.6....but this was ONLY on glass calm lake.
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