superchargers?

[Punchy]

I know this message is old etc etc.. but given your demand for power and the short nature of your racing track distance, While he idea of screw blowers is great i think you'd have a better response from a nitrous application.
Activated via a microswitch at W.O.T.
Nitrous systems are adjustable and can have multi-staging injections to suit your tracks and so on - cost would most likey be way lower than any installed blower assembly with lower ongoing maintinace costs.
My 2 Cents