Twin-Turbo Jet Boat Holeshot Secret Revealed! Finnegan's Garage Ep.106


So many of you have wondered how we are making the twin-turbo jet boat sit still while revving the Hemi and then launching it that we decided to drop a new video explaining why Game Over looks like it has a trans brake. It’s true, this jet boat has no brakes, no seat belts, no transmission and yet we still treat it like a fast drag car when we spool up the turbos and unleash the twin-turbo Hemi on the water. How is this possible? Well, we’ll show you.
In this video we explain how we redirect the water coming out of the jet drive to the sides of the boat, which enables us to rev the engine to over 4,000 rpm and then drop the hammer and take off like we’ve been shot out of cannon! and just for fun, we lined up 100 ft behind my neighbors PWC for a short drag race on our local lake! No surprise, we blew past the PWC like it was tied to a dock. It was still fun though.

Want more info about the jet drive parts we are using? Give B1 Racing a shout at (949) 294-1394 or Henry Morris at 302-530-1522.

want a Game Over shirt? visit my website at:

Thanks for watching.



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  1. 3" outlet on your jet drive is why it accelerates like mad and runs out of top end. You can only cram so much volume through a 3" hole before your cavitating the water pre-pump. I think this is signified by the short rpm burst when you open the neutral bucket, the first .5 second you see the jet stream drive backards and the engine increases rpm momentarily then decreases back down when the water volume is sufficient to supply the pump

  2. I love your videos, but the audio comes through so quietly i cant even
    hear it through my big monster blutooth speaker in my shop:(

  3. I'd suggest a solution to your jet pump starvation but I'm just some dude in the comments section.
    Just remember Bernoulli's principle applies in any fluid. Creating a raised area pre-flow to the intake mouth will induce an acceleration in the fluid medium and a drop in pressure over the obstacle. Additionally, if placed correctly the fluid will have an accelerated velocity and lowered pressure in relation to the surrounding "atmosphere", i.e., water which might more readily force the fluid into the intake.
    Or in other words place the upper chord of an airfoil/waterfoil in a semicircular area in front of the inlet and allow the fluid dynamics to work their magic.


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