In realistic the P-51 D should hit a maximum level flight speed of 465 MPH with WEP applied, just like the real thing. However the peformance seems to be modelled on the Allison engined P-51 A version as it is nearly 100 MPH too slow in level flight.
As the war progressed, engines became larger and more powerful with bigger propellors. This gives a larger torque effect and thus the increased tendency to spin to the right, due to the clockwise rotation of the propellor.
Also I've noticed that most folks don't realise or know that a pilot applies negative (reverse) rudder when an aircraft is banked into aturn to prevent spinning. It is this balancing act of using the rudder to keep the nose up that stops aircraft spinning. It takes quick reactions and familiarity with the aircraft in question plus the the sensitivity on 100% but it is possible to push some fighters into the historically tight turns that some aces managed to pull.
In a test flight with a friend flying a Spitfire Mk.XVI, I managed to pull a tighter turn in a Fw.190-A5 by using the negative rudder technique than the Spitfire could follow.... it is very, very tricky though and takes hours of practice.
If you just turn on airelons and elevators alone you will spin out.
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