1jZGTE Marathon Jetboat

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jetboatkarl
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1jZGTE Marathon Jetboat

Post by jetboatkarl »

Hi Karl here, am based in Rotorua.

Here is something a bit different.
A 23 foot Keelowcraft tunnel hull boat fitted with a 1JZGTE.
The engine internals are standard (for now), but the head has a backcountry port job. Runs a single Holset HX-52 turbo, LS2 truck ignition coils and a Wolf ECU. Have a WB-O2 wideband and Haltech knockears for tuning.

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m989
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Re: 1jZGTE Marathon Jetboat

Post by m989 »

Awesome! How long did it take to build? Any idea what its top speed might be?

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Tofu
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Re: 1jZGTE Marathon Jetboat

Post by Tofu »

Holy bejesus this thing is awesome!
Being in the water means the giant turbo isnt much of an issue with less resistance to the motor? (In regards to lag)

murdoko
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Re: 1jZGTE Marathon Jetboat

Post by murdoko »

NICE! JZ Powaarrrr!!!

jetboatkarl
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Re: 1jZGTE Marathon Jetboat

Post by jetboatkarl »

m989 wrote:Awesome! How long did it take to build? Any idea what its top speed might be?
About 2 years to build as did everything ourselves. Does about 75-80mph at the moment. Still have to play around with the trim and jetunit intake to get it flying properly.

jetboatkarl
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Re: 1jZGTE Marathon Jetboat

Post by jetboatkarl »

Tofu wrote:Holy bejesus this thing is awesome!
Being in the water means the giant turbo isnt much of an issue with less resistance to the motor? (In regards to lag)
Yep that's correct as the jetunit doesn't really load up until 4000 rpm.
Motors get a hard time in a race boat as often you can run 20psi boost 5,800rpm for 30minutes without lifting off. Generates a lot of heat!

jetboatkarl
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Re: 1jZGTE Marathon Jetboat

Post by jetboatkarl »

Here is a vid of our first testing. Had a Holset HX35 on it then. Crank the sound up!

m2x6AfGr_WA

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Tofu
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Re: 1jZGTE Marathon Jetboat

Post by Tofu »

jetboatkarl wrote:Motors get a hard time in a race boat as often you can run 20psi boost 5,800rpm for 30minutes without lifting off. Generates a lot of heat!
How do you cool it?

jetboatkarl
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Re: 1jZGTE Marathon Jetboat

Post by jetboatkarl »

Tofu wrote:
jetboatkarl wrote:Motors get a hard time in a race boat as often you can run 20psi boost 5,800rpm for 30minutes without lifting off. Generates a lot of heat!
How do you cool it?
Raw water from the jet unit goes through a sandtrap (hydrocyclone) and then directly into the water pump, water leaves the head and goes overboard.

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Alex
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Re: 1jZGTE Marathon Jetboat

Post by Alex »

what wolf ecu? who tuned it? my mate has a holset hx50 and wolf v500 ecu on his 1j and struggled to find a good tuner

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