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Thread: 15 400R news
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03-07-2015, 05:27 AM #615000 RPM
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03-07-2015, 07:29 AM #625000 RPM
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powerabout, Dale my peak power is at 6400 but I rev to 6950 (for my best top speed) i tried proping with bigger diameter and raising engine higher, i reduced slip, rpm went down slightly below peak and lost about 4-5 mph. at 6950 rpm i am down over 20 hp but the boat carries past peak. fyi my limiters are at 7500 just cant pull it. need more power and raise peak power
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03-07-2015, 10:56 AM #63Scream And Fly VIP
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Thats a lot of weight change for 5 inches of mid section, I would think they are changing other components as well to save 60 plus pounds for 5 inches of mid. I do think it would run well on one of our 224s that we built.
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03-07-2015, 11:26 AM #64
It is called over rev, the ability to pull past peak power.
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03-08-2015, 02:29 AM #655000 RPM
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just wait the 450 is already running in testing and should also follow soon
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03-08-2015, 02:43 AM #66
Peak power on a 300xs is at 5750 rpm and is 307-308hp at the propshaft. This is according to Mercury.
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03-08-2015, 04:35 AM #67Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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03-08-2015, 08:07 AM #68"12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
"77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp "DANGER ZONE"
"72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored)
"Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau
"This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking
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03-08-2015, 08:10 AM #69Screaming And Flying!
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They dont need a continuing increasing torque to go faster, they need a secong gear
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03-08-2015, 09:35 AM #70Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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03-08-2015, 09:38 AM #71Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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03-08-2015, 09:51 AM #72"12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
"77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp "DANGER ZONE"
"72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored)
"Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau
"This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking
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03-08-2015, 11:03 AM #73Screaming And Flying!
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=Markus;2735694]Peak power is usually way beyond peak torque, which meansitthat torque is decreasing, not increasing.[/QUOTE]
Essentially thats what I said, the hull needs very little torque to push it, so a few more rpm/hp and it will go a bit faster.
Not going to happen on a v bottom.
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03-08-2015, 04:04 PM #74Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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03-08-2015, 04:34 PM #75Screaming And Flying!
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No I do mean after peak power
you must see those argo cats up your way with the SSt120 powerhead ( forgot what they call them over there)
look at the revs they run those to, way past peak power.
SST120 in the USA they are getting toward 9k, saying that that's circuit racing so I guess you need to compare with a kilo record and see what revs they ran at.
So torque peak long gone and horsepower as well.
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