Turbo super boat

This is the full story of the project and build of Loose Cannon. It is a V8 Jet Sprintboat owned by Dean Finch. He has been involved in V8 Jet Sprintboats for quite a few years now. During this time he has made his way to the top and managed to take out both the Australian and World Group A titles. He then went on to the Superboats. But after a short time in his new Superboat it just wasn't quick enough for him. Dean then decided to bring it to us for a major upgrade. This is to include a de-stroke to 475ci of aluminum small block, an upgrade in cylinder heads and a turbo for each side of the thing to top it off.

Sprintboat. The name says a lot. They are basically that. For those that dont know, the boats are around 12 to 13 foot long with a small block V8 and a jet. They turn around inside of them selves, pull the sames G Forces in a corner as a fighter jet and have some serious acceleration.
So a lot of people would think why would you Turbo one. You have Lag and Weight.
This can be true. But with what we have learnt here over the past years of Turbo Charged Engines it is possible to delete Turbo Lag. This all come down to your Exhaust pipe diameter, your Turbo housing size and your Exhaust design. These are three very important thing to archive a super strong Turbo Charged Engine.
As far as the weight factor goes it's no big deal as long as you keep the weight in the right place.

The Turbo pipes are a very important part of this engine, and due to R&D in the past on turbocharged engines we were able to select a pipe dia-meter that would work very well. It is also very important to use the correct merge collector to ensure a very smooth entry into the turbo housing. Selecting the right pipe dia-meter keeps the exhaust gas velocity high there-for kicking the turbo into action early.
It is also very important to have the wastegates exiting angle on the best possible angle that can be achieved. This is to prevent uncontrolled over boosting. In some cases like drag racing where the engine is only at full revs for a short amount of time the wastegate angle doesn't have to be perfect. From what we have found with the endurance race engines we have developed wastegate angles are important because they are running at full rpm and full boost a lot of the time.
The pictures you see are as the pipes were being built. You should notice the nice merge collector welded to the turbo flange.

The turbo's are in place and the pipes are all welded up, so next we have to do the plumbing for the air to get from the turbo into the engine. Because this engine is 475ci and has a beautiful set of heads that flow about 850hp out of the box it is going to have a fairly high demand on it fuel and air. We are using a 1000cfm quad throttle body on top of the intake manifold. We have fabricated our own smooth flowing top hat to sit on top of the throttle body. It has been designed to flow evenly to all 4 butterflys, with the smoothest possible entry. It is all made out of aluminum to try and keep the weight to a minimum. The intake manifold design leaves the valley open so we also had to build a valley cover and distributer boss for the magneto. Next is to work out the actual turbo plumbing, where you want it to go, what bends are required, and also the looks, we wanted to make sure it looked the best we could get. We made this pipe work from thin aluminum tube, the silicone boots are TurboSmart, as with the Blow off valves and matching Wastegates. We had to shape up the Blow off valve weld on flange to fit the 2.5" pipe work.