Originally Posted by TheRooster
Some engine management systems have an anti-lag feature for turbochargers that change spark timing with the clutch depressed. I've even seen a setup have an extra injector and spark plug built into the exhaust manifold to ignite fuel and unburnt air to keep the turbo spinning (much like a turbine engine) between shifts.
Anti-lags are harsh as hell on the exhuast turbine of turbo tho. But at any rate, too much timing retard and too much fuel will give you some nice flame action.