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View Full Version : Broken Paddlewheel on Speedo



nicksterious
06-23-2009, 08:04 PM
I have '08 24' Supra Sunsport. The paddlewheel that registers mph isn't working correctly and new ones are backordered.

I can set perfectpass with RPM's but I can't figure out what the conversion ratio is.

Is there a chart or formula to help figure this out? I don't have a GPS unit to use.

Basically, I need 10mph, 16mph and 19-20mph in RPM's.

Any help would be greatly appreciated.

RED WINE ROCKER
06-24-2009, 06:53 PM
Your gonna need a guy with the exact same boat to answer that.......i have a 21-launch....i use "rpm" for skiing.....at 3200 gives me about 31 mph/ plate down.

mapleleaf
06-25-2009, 07:19 AM
The Rocker's right, prop size and everything come into play here...
Maybe get somebody ina boat beside you, with a working speedo??????Gauge speed and rpm off their speed...

87SunSportMikeyD
06-25-2009, 12:41 PM
car gps should tell you the speed

saltare inverts
07-09-2009, 08:17 PM
gps works great