Thread: RPM's and altitude?
03-01-2011, 10:02 AM #1
RPM's and altitude?
Does this seems ok?
7250 RPM, 95km/h GPS, 32 degrees C, 23 degrees C water temp, humidity 40%, 1660 m alt. Riva ride plate, stock grate, riva sponsons, intercooler mod, stock engine, 92 fuel.
I'v seen some of you posting higher numbers, should I start trouble-shooting?
03-01-2011, 10:15 AM #2
03-01-2011, 10:16 AM #3
03-02-2011, 04:02 AM #4
03-02-2011, 06:37 AM #5
Forgot to say charger at 10psi on the dot(according to stock meter). Hear you guys talk about 11.5 psi. Do you also think it may be the altitude? Like that since brand new.
03-02-2011, 09:06 AM #6
03-02-2011, 11:51 AM #7
03-02-2011, 11:57 AM #8
03-02-2011, 12:09 PM #9
03-02-2011, 12:13 PM #10
What caught my attention was the altitude/rpm title as i know a bit about that subject. (RAD)
1660 meters is 5,500 ft.
32 celcius is 90 degrees F.
With 5,500 ft elevation, 90 degrees air, and 40 % humidity your corrected air density will be between 8,000 to 9,000 ft above sea level.
That will change horse power drastically.
On a Doo we will see 100 rpm decrease for ever 1,000 ft in elevation, therefore i would have to assume you could be down 800 - 900 rpm from what it would be at sea level.
NOt sure what your max rpm are suppose to be on your ski but your RAD (relative air density) is very high and will change power alot.
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