Quote:
Originally Posted by McGillicuddy
Yea, I believe your XRi is a 2.5L as well. Maybe Bigshrimpin will confirm or correct that. If you have gps just run it off a 6 gallon tank and measure your distance for a gallon every 500 rpms from 3000 to 5800 rpms. Then do the math.
First you'll have to change your prop as you appear to be over-propped.
Pitch is only one factor in getting the right prop. What brand, model, and diameter is the prop? Al or stainless? Ask a boat/prop shop or friend to loan you a used aluminum 15 x 17 black max or black diamond Quicksilver # is1912 2X. I am certain you will see improvement in every performance category. That should get you closer to your target rpms and make your motor happier. And contrary to popular belief, you will likely see economy increase with less pitch. and the right prop. perhaps I overestimate that motor but I think you should see mid 40s at 5800 rpm on a 20 with that motor and the right prop.
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I have a Mirage SS prop I am not sure on the diameter though. I dont really know anyone that could loan me a prop but I might just pick one up to test it out see what results i can get. Thank you for you information and sorry if I hi-jacked the thread
Quote:
Originally Posted by Bigshrimpin
150 XRi is a 2.5L. You need to prop the boat so that the motors turns 5800 WOT with average load. I suspect you can improve your performance quite a bit by raising the motor a few holes and finding the right prop. 5100rpm with a 19P is lugging the motor down too much and you'll get crappy fuel economy and performance. I could crack 40mph on my 20 MA with a 150xr2 and that's a 2.0L motor. The super long 150 tuner limits the top end on that motor a bit, but you should be low to mid 40's with a 2.5L 150.
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With myself and another person a light load and flat water i can hit 41 @ 5100. I didnt know you could run these motors safely beyond 5k. I will look into your other suggestions thanks.