Thread: Impeller help
03-19-2008, 07:59 PM #1
I'm am about to put a Rotax Racing Intercooler on my Stage I (with GH waterbox) RXT. What impeller is best for this setup, my conditions are similar to that of Florida, mid 70's to mid 80's.
Also, what impeller would I need if I were to add in addition to the above setup:
1) Green Supercharger wheel with a Rude rising rate regulator.
2) '08 X Supercharger with a RRR.
03-20-2008, 07:18 PM #2
03-20-2008, 07:23 PM #3
I would say start with a Solas 14/19.. You'll just have to see where your Rpm's and Mph are and then tweak the pitch a little to get it into the sweet spot
03-20-2008, 07:43 PM #4
Thanks, is that a rotax intercooler in your signature? You run a rear exhaust or no? jw because you said it doesn't fit!!!
03-20-2008, 07:48 PM #5
03-20-2008, 07:52 PM #6
I would feel better with a 15/20 now that you brought it up, the rpms are at 8150 right now, I could always depitch a little if need be.
03-20-2008, 08:29 PM #7
- Join Date
- May 2005
Rxt with a riva air intake, green wheel (or Rotax wheel) and a riva grate with no opas in fresh water is perfect with a 14/19 4-blade depitched to 14/18.5. In salt water you'll lose 150 rpm's or so. I'de say with an intercooler you'll be close with the 14/18.5. With an intercooler and sc'r wheel repitch to 14/19.5 or get a 15/20 and take some out.
03-20-2008, 08:34 PM #8
Come On Spring!!!
03-20-2008, 08:35 PM #9
Our rxtwill have an s2 set up:
4inch front air
thru hull exhaust
I was advised and purchased the 15/20r.
if it needs more fine tuning, we will add the venturi nozzle.
Will let you know how it works out, in 2 months
03-20-2008, 08:47 PM #10
keep in mind the s3 charger has a little more pull than the stock s/c or green wheel ...
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