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3765 kW / 5049 hp is the max I could do.

V Twin Bank, Turbocharged with Intercooler. And Fuel is Hydrogen!

I was using Supercharged, thought that was better. :) Now I got it tuned up to 3767 kW / 5051 hp, that must be the maximum.

I imagine such an engine would instantly blow itself apart in real life. Basically the simulated version of those tractor pull cars where the engine survives for about 500 rotations before it has to be rebuilt.

Depends on the displacement and other factors. Huge engines in that power range like the https://en.wikipedia.org/wiki/EMD_710 are used in locomotives and other applications like power generation where they run 24/7 at 100% load.

How do you tell how much power it is making?

On the dyno panel you see "pk" which is peak power. If you don't see the dyno panel on the right, you'll have to scroll down to see it.

Found it now, thanks, I had to scroll down.

This is like a much cooler version of a thing I made a few years ago for simulating model oscillating engines: https://incoherency.co.uk/oscillating-engine/