what would you guys do prop or ecm?
#1
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what would you guys do prop or ecm?
My 312 Fastech has twin 454mag MPI's, gets on plane fast and runs 70-71mph. I'm hitting the rev, limiter now, In about 2 weeks I'm putting on my Gill off-shores and my Vortech breaters. Would you get the ECM re-programed to bump the rev and some more ooommmfff. Or have the props reworked OR jump up in prop size? I have 28 Bravo-1's Or all the above?
#2
My 312 Fastech has twin 454mag MPI's, gets on plane fast and runs 70-71mph. I'm hitting the rev, limiter now, In about 2 weeks I'm putting on my Gill off-shores and my Vortech breaters. Would you get the ECM re-programed to bump the rev and some more ooommmfff. Or have the props reworked OR jump up in prop size? I have 28 Bravo-1's Or all the above?
#5
Charter Member # 545
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If you are only going to do one or the other, do the prop. If you are going to change the ECM at some point do that first. You may have to change the prop pitch anyway with the ecm change. You wont have a baseline to work with until you run the boat with the new ECM, then you will know what you need in a prop.
#6
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My 312 Fastech has twin 454mag MPI's, gets on plane fast and runs 70-71mph. I'm hitting the rev, limiter now, In about 2 weeks I'm putting on my Gill off-shores and my Vortech breaters. Would you get the ECM re-programed to bump the rev and some more ooommmfff. Or have the props reworked OR jump up in prop size? I have 28 Bravo-1's Or all the above?
#8
21 and 42 footers
Platinum Member
Seems like a lot of prop slip. Plug in your numbers on this site. I run 70MPH at 5000 RPM with a lab 25 Mirage. You have over 19% prop slip. http://www.rbbi.com/folders/prop/propcalc.htm
If your close to the rev limiter, I'd work the props and agree labbed 30's is probably the way to go.
#9
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I assumed 1.5 as a stock ratio, 1.65 would make more sence. That would be more like 12 or 13%.
Last edited by jeffswav; 11-26-2009 at 08:50 AM.