04-19-2010, 08:06 PM #1
A second look at the RIVA curves.
I was taking a look at the curves that are in the Riva CDI boxes for the 65u motors and notice none of them are really for the triple pipes.
I noticed that at 7500 range where the pipes perform the timing on mod1 and mod2 are 17 and 18 degrees.
the limited curves set for cyl1, cyl2, cyl3, at 7500 are 24, 25, and 26.
Conclusion, Yes they all have great mid range for the pipes and single applications But they are all lacking lower advance timings at the 7500 range.
I recall MSD were running nothing higher than 14 degrees advanced at 7500. While many were running as low as 10 advanced.
Please anyone out there that was running msd let me know what your timing numbers were.
This could shed some light on why the pipes dont perform with huge numbers over single pipe while running the RIVA CDI.
No excuses just having a second look.
04-19-2010, 08:52 PM #2
Well...for whatever it's worth....
The Riva built Tripple pipe skis w/ "65U" all ran the "Riva" CDI's in their GP1200 skis so if there was much to gain, I would think they would have done something with the mapping at the time they had them "CDI" built. I would get in touch with Mikey Thorn and or call TJ directly Kris. Something tells me the curves are good enough....
04-19-2010, 08:57 PM #3
04-19-2010, 09:07 PM #4
I'm with ya...although won't the J prop be to much drop in RPM and wont' allow you to get on the pipe?
04-19-2010, 09:20 PM #5
If I can keep it above 7400 I will be fine. Spoke with mikey just now. He thought msd sits between 10-14. Nothing to do with my boat just was making assumptions on the graph you sent me.
I will try out the j and stock pump tom.
I am also going to put a lil more pitch on my leading edge of my skat prop. Maybe like a 14 or 15.
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