01-21-2010, 01:44 PM #1
Trying to Dial in prop pitch - Help
I have a Speedster 150 but the boat section doesn't get alot of traffic so I figured i'd have better luck posting here.
I'll give you a break down of my progress.
SPECS & Mods
2007 Speedster 150 215hp
4" Air intake
Speed with Mods - All speeds are GPS verified with the same GPS
- Stock Everything with only 4" Air Intake - 54MPH@8060rpm
- X-Charger, Injectors, Stock prop - 57.2MPH@8160rpm rev limiter(5/8 throttle) - water temp 72*
- X-Charger, Injectors, 15/20r prop - 57.1MPH@7800rpm water temp 72*
- X-Charger, Injectors, 15/20r prop repitched to 14/18 - 52.1MPH@8160-rev limiter (7/8 throttle). water temp 66*
The boat ran the best with the stock prop, even though I was all over the limiter.
Could someone educate me on prop pitch numbers? I don't really know what 15/20, 14/19, etc... actually mean. All I know is the bigger the number the more power I need to turn it.
01-21-2010, 01:55 PM #2
- Join Date
- Jun 2005
- rome ga
You should probably start @15/22 you would like to be running below 8100
01-21-2010, 02:17 PM #3
01-21-2010, 02:19 PM #4
01-21-2010, 02:23 PM #5
I would pitch to 15/19 and see where that gets you. I have a feeling that you are fighting the climate. How much did the weather change from one test to the next. You are likely taking pitch out to get the 's up and at the same time the weather is getting cooler and the engine is making more power making it harder to get the pitch right. If thats the case you may be able to almost turn the 15/20 now.
01-21-2010, 02:30 PM #6
01-21-2010, 02:44 PM #7
01-21-2010, 02:54 PM #8
All I can say is that when I was stock I could go from winter to summer and my rpms would only change about 150rpm.
I went from 7800 RPM full throttle to bouncing off the rev limiter 8160-8180 at 7/8 throttle. The water temp only dropped 6* and air temp maybe 10*. Tests were done less then 30days apart.
01-21-2010, 02:58 PM #9
01-21-2010, 03:05 PM #10
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