Nitrous Oxide on a boat
03-28-2014 | 12:35 PM
#32
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Joined: Jul 2007
Posts: 2,640
Likes: 14
From: MI
How much do you want to run, set it up like a car with a dry kit, high pressure fuel pump, msd ignition, great for running big pitch props, I run it with a 525 EFI with just a 125 HP (.0625 Jet) with a 36" Pitch Bravo 1 prop and 1.36 gear runs 125 MPH at 5400 RPM in my 2000 Powerquest 280 Silencer, runs perfect, superchargers over-heat engines and engine compartments, and also push RPM's over the torque band, torque push the prop not horsepower.
03-28-2014 | 01:01 PM
#33
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Joined: Sep 2011
Posts: 557
Likes: 4
From: Fox Island, WA
I put a NOS kit on a friend's Mirage 21' powered by a 350 Magnum. Comments listed above were similar to this experience. We moved up 2" in prop pitch and even that wasn't enough to handle a 75 h.p. shot as the engine would jump to an indicated 5700 r.p.m.s. With the 2" larger prop it was over-propped off the bottle.
The plus side was a VERY angry sound at WOT on the bottle and a 4 m.p.h. gain in top speed. The was on a quadrajet setup. We stayed with the smallest jets in the kit as the engine had cast pistons and we didn't want to mess with adding a timing retard. NOS (back in the days when Mike and Dale owned the company) said the small jets were safe to run with everything else stock.
The plus side was a VERY angry sound at WOT on the bottle and a 4 m.p.h. gain in top speed. The was on a quadrajet setup. We stayed with the smallest jets in the kit as the engine had cast pistons and we didn't want to mess with adding a timing retard. NOS (back in the days when Mike and Dale owned the company) said the small jets were safe to run with everything else stock.
03-28-2014 | 04:03 PM
#35
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Joined: Nov 2004
Posts: 14,109
Likes: 3,694
From: On A Dirt Floor
I must be doing something wrong. Years back I could only get 191mph out of a single engine 30ft deep vee with a 502 .
Joking of course...LOL.
03-28-2014 | 05:09 PM
#38
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Joined: Jul 2013
Posts: 10
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NOS 125 HP isn't really that much on a 525 EFI, a stock 280 hull isn't going to take much more than that, more than 650 HP, the drive will have to be rebuilt, so that's probably about it, 125 MPH on the water is like 250 MPH on land anyway (this was a modified NOS kit for an LS3 Camaro). Videos coming soon. Powerquest may be coming back, I might even buy it if the offer is right.
03-28-2014 | 05:24 PM
#39
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Joined: Jul 2013
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No, it's MPH, because I can run a 36" Pitch Bravo 1 prop, the biggest thing that fit on that will fit on that shaft, and this is with a 1.5 gear with only 4000 RPM prop speed, 140 MPH is possible with a 1.36 gear (4500 RPM+ prop speed) but I don't think this 2-step hull will take it, it would need to be a 3-step hull with a cross-nylon composite similar to the Fountain racing hulls (25% lighter, 3X stronger), I have another 280 Silencer that has a cross-nylon composite hull licensed out by Fountain that goes significantly faster, this one also has an XV-Extended Drive with electric steering booster pumps to allow easier steering at higher speeds.
03-28-2014 | 06:07 PM
#40
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Joined: Apr 2001
Posts: 6,305
Likes: 36
From: Naples, Maine
No, it's MPH, because I can run a 36" Pitch Bravo 1 prop, the biggest thing that fit on that will fit on that shaft, and this is with a 1.5 gear with only 4000 RPM prop speed, 140 MPH is possible with a 1.36 gear (4500 RPM+ prop speed) but I don't think this 2-step hull will take it, it would need to be a 3-step hull with a cross-nylon composite similar to the Fountain racing hulls (25% lighter, 3X stronger), I have another 280 Silencer that has a cross-nylon composite hull licensed out by Fountain that goes significantly faster, this one also has an XV-Extended Drive with electric steering booster pumps to allow easier steering at higher speeds.
