RPM'S AND ALTITUDE?
Posted 24 May 2008 - 01:28 AM
Posted 23 June 2008 - 12:15 AM
I also tested out my speed with a gps unit. I found that my speedometer was really accurate. At 7300 rpm's i was getting 38 to 41 mph, depending on what or who I was carring!
The trip was Fantastic! I thought my boat did reall well down there besides the rpm issue. With a lighter load on board, my wife said the boat had to much pull getting her up on the ski, had to back the throtle off a bit.
Posted 23 June 2008 - 08:35 AM
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Posted 24 June 2008 - 09:25 AM
Thanks for reporting back, it is a good thing to know about the elevation.
Seadoo and Mercury Marine both have high altitude settings for their engines, I know of a Mercury 240 HP EFI that went form sea level to 4,000 ft and it ran so rich at the higher altitude someone called the fire department! Once he got the readjustment the engine ran well again.
Posted 06 August 2008 - 01:52 PM
Posted 14 August 2008 - 11:23 PM
My sportster SCIC appears to loose less than 100 RPM at Sea level vs. 3500 ft in cold water with 14/19R solas prop.
My 06 Challenger 180 tower with a solas 14/19 impeller does 7700 rpm and 44 mph at sea level.
Last week I took it up to Lake Tahoe at 6500 feet. It did 6700 RPM and 34 mph there.
This is all by GPS.
Altitude does indeed make a difference, even with a supercharger.
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