were is your probe at?

I have alot more fuel then a turned up pump.

i still have some more work and figuring to do with mine

x2 so do i. start throwin injectors and stuff in there and see what your temps do. and your probe should be in the exhaust manifold

mine is in the exhaust manifold. a little to the rear of the divider. I run between 650-800 at 70mph with boost between 3-8psi. if I floor it in 5th i can just hit 1200 and 15-18psi of boost.

my fuel screw is turned in to the collar, dennyT fuel pin and 3200rpm gov spring, and a good bit of timing advance. everything else is stock, including the super laggy 21cm turbo housing etc.. I really need my fuel pressure gauge install kit.

the motor in STOCK form is rated to run 1250* continuous at max torque rpm. with our lower pressure injection pumps and innefficient combustion you can run higher temps longer than newer more efficient trucks without melting pistons or burning valves.

You know whats weird, airplane engines are all aluminum, and I was flying a fairly new one the other day with a G1000 electronic cockpit display system. It has a screen on there for leaning the engine at higher altitudes that tells you EGT for each cylinder. I was cruising at 1450-1500 EGT on all four cylinders for more than an hour with an all aluminum engine. Im just wondering what is different between those engines and Cummins?

Compression....

it uses oxygenated high octane gas?

there are a lot of differences im sure, the aluminum alloy and heat transfer for sure.