![]() Was it quicker? I have no idea, these boats are quick enough. What did it do? It made it louder, not a single mph faster. I started out trying to optimize the exhaust for optimum flow. As you've seen with my exhaust system mods, I'm actually going backwards on power mods there. But also as we've all learned, these hulls don't like to go over 55mph. And as far as the boat itself goes, as we all know, they work exceptionally well for what they were designed for. They're not like the example of the GM LNF I gave where stock they put out 260hp/260tq and with tuning and fuel changes only you can almost double that. ![]() Yamaha engines are bulletproof and for the most part, VERY well tuned from the factory. ![]() Interesting idea that I've obviously had, but again realize that it would be pointless and dumb. Throwing a couple 500hp LNF's in these boats would take it from 360hp to 1000hp, but then what would you have? A stupid waste of time and money! lol. I've got hundreds of those engines running around the country at anywhere from 400 to 600 crank hp and torque. Direct injection, dual overhead cams with full control over valve timing, water cooled turbo and one of the best engine management computers made, the Bosch E69. The tuning, monitoring and hardware on something like even a 10 year old LNF are INSANELY more advanced than these Yamaha marine engines. I'd either go straight to Motec on the stock engines and probably put EFR turbos on them, or simply throw a couple of GM LNF engines in and be done with chasing horse power. Like I've mentioned before, IF I was interested in making the fastest Yamaha jet boat on the water, I'd go one of two directions anyway. H#ll, I can modify the ignition and fueling on my new Yamaha dirt bike ON MY PHONE!!! But just like Jgorm said, our experience tells us that the returns on investment of time and money would simply not be there. It has been REALLY HARD to restrain myself from diving into these Yamaha engines. Just put cheap gas in them and go.(I know you already have modified tunes in your engines Wojtek, this is mostly for anyone else reading and considering diving into it.)īelieve me, I've "tuned" everything I've gotten my hands on since my '67 Mercury Cougar that I built the engine for before I even had my drivers license. (Happy to see another car guy on here btw!) Take it from a couple guys that have seen the "other side" of the tuning world (the "real" side actually), it's simply not worth going crazy on tuning or even monitoring these engines. Yay! Wojtek now you have TWO smart guys that are going to burst your bubble on tuning or monitoring these boats! Lol. Lectrotab Trim Tabs w/SemiAuto MLC-1 Controller RideSteady/Hydrophase GPS Cruise Control Lucky 13 (L13) Cones Cobra Magnum AK w/MEGA Fangs, Secondary Steering Rod, EZ Locks Seadek /Full Set w/Extra Pcs WakeMakers Custom 2,400lbs Fully Integrated Ballast System w/4 Rev Johnson Pumps Wake/Surfboard XTP Racks w/Swivels Premium Sound System: Wet Sounds ICON8 Tower Speakers, Wet Sounds HT-2 Marine Amp, Wet Sounds WS420SQ Equalizer w/TalkBack Mic, 10 Polk DB651s Coax Speakers Cabin/Swim Deck, BassLink Powered Subwoofer, 2 Clarion XC1410 Marine Amps Sound Deadening System (RAAMat) Raymarine Dragonfly 5M GPS Chartplotter 150A Helm Aux 12V Circuit w/Distribution Blocks CIPA Mirror 180 Bow LED Docking Lights VHF DSC Radio/Fix Mount Antenna Secondary Bilge Pump System ProMariner Smart 2-Bank Charger w/NOCO Outlet Bumper/Fender Locks Premium Yamaha Cover Bow Stop/Stoltz Radial Tires, Trailer Mods
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