Thread: When to up-pitch from 14/20
07-16-2007, 05:49 PM #1
When to up-pitch from 14/20
I am running a 14/20 Dynafly as many of you know. I have finally "unlocked" my ski thanks to many on this bored. I am turning over 7100 rpms. 7145 rpms to be exact at 72+ mph now. I know this is where i want to be.
My question is when is a good time to up-pitch the impeller RPM wise? I have been thinking about doing another big round of mods in a month or so but thought, well I might have to repitch. The mods I plan to do are
Sonic Boom TBs (maybe big bore ones if they make more power)
Lowell Milled Stock Head (going from 118 psi in the heat to 140-155psi)
Advent ECU if it really comes out any time soon if not... maybe keyway.
07-16-2007, 05:57 PM #2
Since you are only running a little over 7100 rpm's in the heat, I'd leave the prop alone. If you pitch higher, you're going to pull the rpm's down way too far.
Wait to see what the mods do for you, rpm-wise, then go from there.
07-16-2007, 06:00 PM #3
07-16-2007, 06:03 PM #4
07-16-2007, 06:55 PM #5
Ahhh, well I mean since the target rpm is 7150 and lets say I was running 7300 what type of pitch would I want. Or is that also too open ended? If so man this stuff is confusing lol.
07-16-2007, 07:37 PM #6
07-16-2007, 07:54 PM #7
07-16-2007, 08:05 PM #8
So if I am at 7400 RPM's and want to lower them... I can tell Carl and he will repitch what he thinks will correct my RPMs to 7150 ? i am running 7400 in 90* heat. ... about 71.8 average speed i think i can hit 75 next spring after some fine tuning/truing, and modding...
07-16-2007, 08:06 PM #9
Wait till you bolt on the Sonic Boom's and go from there.
Or basically wait till you add more mods...compression, booms, ect..... for now, I'd keep her right there.
07-16-2007, 08:13 PM #10
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