We are generally using around 1600mAh in a 5 minute race, but that is a with a fairly tame motor (17.5t) so 4000mAh should be plenty.
As Robbie has said though, when under heavy acceleration (at the start or out of a corner), the high current drawn will cause a significant temporary voltage drop (due to the internal resistance of the cells if you're interested) which may cause the lipo cutoff to trigger even near the beginning of the race. The only way to find out for sure would be try it.
What is your reason for wanting to use NiMh to start with?
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Team C TC02c - My son breaks it, I fix it.
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