08-21-2005, 01:47 PM #1
I just tested my stock ECU with the 15/20
With RR ECU and 15/20 top RPM's of 8000 with flahes of 8050 at a speed of 72.0 mph
With stock ECU and 15/20 top RPM's of 8000 and a top speed of 72.1
The acceleration seemed to be a tad bit better. I guess because it is leaner with this ECU.
08-21-2005, 07:58 PM #2
Jerry, Did you think about this prop works best with the stock venturi
nozzle? I haven't read a lot about your setup, but I think your said you were running a smaller venturi at one time. Since Riva doesn't sell a Venturi it was probably only tested with there mods with the stock
pump parts. Just something to consider. Ben
08-21-2005, 08:01 PM #3
hulk what rpms were u turning before? what impeller/pitch? top speed? is the rr computer worth the $$money$$?
08-21-2005, 08:11 PM #4
08-21-2005, 08:12 PM #5
- Join Date
- Apr 2005
With the RPM's you are turning,the speeds,and,a taller/steeper prop, ya think it MIGHT be possible that you guys are are outflowing the intake area,not so much of the pump,but the intake area itself? You think it MAY be possible that IT is becoming a restriction? I know you are running a grate,but............I wonder what would happen if you could enlarge the inlet area a bit, to allow more water to the pump itself. It stands to reason,that if the engine doesn't have to use as much of it's horsepower sucking the water IN, it has MORE available to use on the BLOW side
Things that make you go "hmmmmmmmmm"
08-21-2005, 08:13 PM #6
Ben, i ran it today with my stock venturi.
painkiller, my RPM's before were 8400-8450 with a repitched Solas 14/19.5.
08-21-2005, 08:16 PM #7
SKR8PN, i have often thought about this very issue, but i don't have the guts to modify this part of my hull.
It's a damn good theory though. If someone wants to donate me a hull I will definately try it
08-21-2005, 08:16 PM #8Originally Posted by Jarrett
08-21-2005, 09:40 PM #9
It looks like in the Pics that the RIVA IC has a shorter intake track, maybe all we need is a new mounting bracket and new IC piping to move the RR IC forward and shorten the distance between the IC and motor???
As far as overflowing the intake area, I think more intake grate could flow all the water possible, but the pump could use some help.
I know when Scat finishes their pump I will be trying one. Scat's GP said they will have some results in a month or so.
08-21-2005, 11:03 PM #10
what we need is a light weight I/O motor with hydraulic trim with dual counter-rotating props like a mercruiser Bravo 3 .... imagine that kinda power in a little 10 foot PWC? but the block and outdrive would sink the ski....
i TOO also think that the pump / intake grate setup is restricting us, but it's a TON of R&D to come up with something different. I feel like the water isn't flowing thru the intake grate at a fast enough rate for the impeller and motor.... but i guess if that was the case we'd be cavitating and hitting the rev limiter... which means it's getting exactly enuff water flow thru the intake?
defintiely a VERY interest concept to think about, but all the times i've pondered it, i can't come up with any alternatives in my wildest dreams that would rationally be feasible.
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