Thread: Riva RXP Venturi Nozzle
09-27-2007, 02:01 PM #1
Riva RXP Venturi Nozzle
Curious how effective this $350 thing is. And I'm thinking ahead to the RXP-X model since the intake mouth might hinder top speed changes in that area in terms of a grate (but we'll see), what about reducing the output (nozzle) for top end gains? Best of both...will you get low end with the larger intake area and top end with small nozzle?
Here's what Riva says about this product in case you haven't seen it already:
Our Pro-Series Reduction Nozzle is ideal for tuning your Sea•Doo pump combination to maximize performance. Nozzle exit diameter can be easily changed via interchangeable ring system. Looking for more RPM or acceleration power? Insert a larger diameter ring. Want more top speed? Install a smaller diameter ring. Nozzle includes three precision-machined stainless steel rings. Additional ring sizes available.
09-27-2007, 02:09 PM #2
About 1mph gain if you're lucky
and you can easily tune your rpms up or down depending on weather, altitude, and what rings you have
to me it's not worth $350..more like $250
i've been thinking for a while now that Skat has the same thing as riva, except they give you 2 more rings and charge the same price. some1 let me know if i'm wrong.
09-27-2007, 02:15 PM #3
09-27-2007, 02:18 PM #4
And I remember on my '04 RXP trimming my reverse gate and that was a mistake because I didn't really see much gain and any time I slid the ski in a turn it would engage in reverse and that sucked!
Will have to check Skat out as well...wonder if Jerry's selling Skat stuff?
09-27-2007, 02:19 PM #5
the SKAT TRAK version DOES NOT HAVE THE water ingestion tubes that are mounted inside the nozzle that PULL WATER FROM YOUR HULL WHILE RIDING! the two tubes in the nozzle create a vacum on those lines inside your hull and pull water out of your hull while riding! the SAKT TRAK is a cast version of the STOCK but DOES NOT have those tubes to use the hull water evacuators! the RIVA version is a STOCK nozzle machined to accpet the rings and KEEP the water removal lines working order! thats the difference Guys!
09-27-2007, 02:19 PM #6
Diggs...do you machine the nozzle? That would be nice!
09-27-2007, 02:37 PM #7
Well looking online in Jerry's toystore, a stock venturi will run about $54 and I couldn't get a cost on the 9 rings you can get from Skat ranging 80mm to 88mm. It looks like they're held in with two set screws that screw through the outside of the nozzle and into a groove of the nozzle ring. Seems simple. But it says top speed smaller size will reduce RPM and I'm sure if you have 9 rings to pop in and out you don't want to fine tune your RPM when you're constantly fluctuating it with the nozzles. But if one were to work best with the X intake combination then it might be worth keeping that one in and then adjust the pitch perhaps of the impellar to maximize RPM with the smaller nozzle sizing...hmm. Is that too simply thought and realistically unlikely that easy to assume you can get both low and top end with the wider intake, a tweak in the intake grate, better pitched impellar all tuned with the right sized outlet in the venturi nozzle?
09-27-2007, 02:48 PM #8
09-27-2007, 02:53 PM #9
09-27-2007, 02:58 PM #10
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