Thread: RPM increase with 3" riva intake
12-17-2006, 10:23 PM #1
RPM increase with 3" riva intake
As quoted from the riva site:
"Power Filter provides greatly improved acceleration and a 150~200rpm increase by replacing restrictive stock intake system."
I have this intake & saw only a 20 rpm (8180) increase & I ran it on the same day 2 hrs after my 8160 rpm run with stock prop, 2.0 wedge & flat B/O's.
Am I bumping the rev limiter or something? It sounds a little different I guess. But honestly, I don't really feel much increase in the powerband.
Has anyone really seen that much rpm increase? I kinda feel like it's money spent & that's it.
Am I missing something? It's installed so it's staying till something better "proven" comes along.
12-17-2006, 10:34 PM #2
You are most likely on the limiter. If you add 1-2mm of pitch to the impeller you should pick up 1-2 mph and still be able to turn 8160-8180 rpm.
12-17-2006, 10:42 PM #3
I hope so. So what IS the 06 rxp limit set at? On the trailer I've seen 8300-8400 rpm but feeling the limiter kick in with a quick blip of the throttle when blowing it out.
12-17-2006, 10:48 PM #4
8200... The '04-'05 skis would usuallly run at 7950 stock and gain around 200 rpm with the Riva air intake. The '06 skis tend to run around 8100 stock, so there isn't much room for improvement without hitting the limiter. Also, the '06 skis read in increments of "20" rather than the earlier skis that read in incremnts of "50". You will most likely never see 8200 (unless you come unhooked) because the limiter starts retarding the timing.
I've got an altered stock prop you can try if you like.
12-17-2006, 11:10 PM #5
Jeff can help you alot he has just a few parts
one more thing DO NOT rev your ski that high out of the water
12-17-2006, 11:19 PM #6
- Join Date
- Oct 2005
12-17-2006, 11:29 PM #7
12-17-2006, 11:55 PM #8
Oh yeah...I've tried other props already.
The lake is 1250ft above where I ran these #'s
stock prop = 8160 @ 69.6 full tank & 70.2 1 bar above 1/2. spun 7460rpm out of the hole
3 blade 13/18 = 8000 @ 68.2 full tank. Spun 7500rpm out of the hole
14/18.5 concord = 8120-40 @ 69.2 full tank..this prop spun 8020 out of the hole.
The props have been repitched by impros already except the stock one.
14/18.5 is now 14.5/19
13/18 is now 13/17.5
So i'll run 'em again!
Oh, after the 10.5 hr oil change the ski gained 80-100 rpm. from 8040-60 to 8160 at senators with stock air intake.
here's the thread on the mod comparrisons. scroll to post #31
Last edited by ou812; 12-18-2006 at 12:01 AM.
12-18-2006, 12:19 AM #9
Its those crappy block offs your running! You need some good quality slightly used high in demand re block offs my friend!
12-18-2006, 12:24 AM #10
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