11-05-2010, 09:13 AM #1
Questions about Riva adjustable nozzle and Riva rideplate for FZ
Currently running a unmodified VX plate shimmed .06 front and rear. I'm willing to give up a little speed to decrease the porpoising I'm experiencing at WOT. At 82, the porpoising is so bad w/ trim neutral that I'm actually afraid to open it up in all but the smoothest water.
Has anyone switched from the VX plate to the Riva plate? Wondering how much speed loss I'll get and how the Riva plate performs in the low 80mph range.
Also, the Riva adjustable nozzle includes three reduction rings, 81, 82 & 83mm. I'm assuming the 82mm most closely approximates the stock FZ nozzle? What's approximate RPM drop per mm of decreased ring diameter?
Thanks for the help,
11-05-2010, 07:06 PM #2
My buddy is geting rid of the Riva ride-plate becasue it wont stay hooked up in the water. I recomend the R&D Ride-plate. Im currently in the stages of trying a works ride plate. I raced closed corse, and hear good things, but the long of the short, is the R&D stays hooked up, and you might gain more speed...
11-05-2010, 07:11 PM #3
you can also PM STANGBANG. He has personal experence with the Riva Ride plate. He could guide you in the right direction
11-10-2010, 06:32 AM #4
11-10-2010, 10:15 AM #5
11-11-2010, 07:28 AM #6
Thanks, I'll give that a shot - eventually...
I believe I blew my motor yesterday, rod went through the block, I'm guessing.
There's water in the oil and oil in the hull. Not sure the extent of the damage until I get the motor out. Sort of devastated and numb at the same time - I'd just gotten it dialed in and running great. Looks like a long and expensive rebuild in the works.
11-11-2010, 09:02 AM #7
- Join Date
- May 2006
That really sucks, what mods do you have done and how many hrs.
11-11-2010, 12:51 PM #8
11-11-2010, 01:51 PM #9
11-12-2010, 07:47 AM #10
I'll tear into it this weekend. Only had 45 hours on the ski. Will post more info when I have it.
Mods are: Riva air intake, Riva through hull exhaust, Riva waterbox, Riva manifold upgrade, JD IC on dedicated pump line, foam inserts removed, tubes removed, hull ventilation, VX ride plate (shimmed .06 front & back), TMB intake grate (chip removed - foil in least aggressive position), Skat Swirl 13/21 (true) prop, R2 ECU, Powershot, ETech low boost wheel (14.1 @ 8600), Macc sponsons.
It's not like I was really pushing the edge of the envelope or anything.
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