Douglas DC3 lacks power

I am havi8ng issues with t5he power of the DC-3. At full throttle I cannot get above 80 knots.
Any suggestions would be greatly appreciated.
I have the realism mod installed.

Did you apply too much manifold pressure and get into a detonation situation, which has affected the engine’s health and, therefore, power output?

I’m fairly sure the mod has that implemented.

Another thought could be carb ice. Apply full heat and see if that improves power output.

Both those things could be the cause and I’ll add if you are at high altitude you’ll need the superchargers engaged to boost your manifold pressure.

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