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Engine Braking

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Can you tell me how timing affects engine braking on decelleration

Hello if the fuel is switched off in over run then it will have zero effect at all but if the over run fuel is still allowing fuel the more advance you have the more the effect you will see example is say mbt is 40 deg and you add 20 to say 60 deg in the over run it will engine brake more slowing the car faster

Regards Ross