Chase across the channel, Blenheims outrun my Emil !

[MD_Titus]

CEM off equals slower planes, ut seems that the main effect is to disable prop pitch controls and limit your maximum rpm. this is certainly the case with the spits in the two sorties I flew with it off. Turn CEM on but keep overheating off if you want a simpler learning curve.

[Raggz]

If it was the E-4 check that the prop pitch is moving. I have noticed that the automatic prop pitch sometimes get stuck when it's auto set lower than 9.