Ya on that run in the vid is sounded like you broke something at the end of the run... What is your competition like? (what other engines are used in the class, is it diesel only?) Any pics or other videos would be cool, I would love to see them.
As far as the nozzle is concerned, its not that it really flows more, but the spray pattern and atomization is better. The IDI nozzles don't have a specific opening diameter like a direct injected diesel, what controlls flow is how much the injection pump is pushing, and therefore how much the needle is being lifted off the seat of the nozzle. With the 12mm head you have the fueling potential for sure. What other pump mods have you done? It looks like it was using all the fuel, there wasn't much smoke once the turbo spooled. Have you shimmed the gov, ground the fuel pin? For that matter, in a application like yours thats full race, I would remove the AFC lever all together, as even with a ground pin it still limits fuel somewhat. How much boost are you pushing?
I have heard with the 12mm head, other pump mods, and enough boost to clean it up these engines will push 300hp at the flywheel. There was a member on here that hasn't been on in a bit, that made 269 hp to the rear wheels, which is just over 300 at the flywheel. Torque was I think in the 400 range.
Jason
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