The process of forced induction is the delivery of compressed air to the intake of the combustion chamber, which solves the limitations of atmospheric pressure. Turbochargers and superchargers are the two forced induction delivery systems, both vastly different but equally effective. Upgrades to the cooling systems will Turbocharger efficiency exceeds that of a supercharger primarily because it doesn’t require engine power to spool, plus the lower resistance allows the blades to spin faster. However this spooling sequence puts the turbocharger at a disadvantage as it takes time to spool – termed boost lag. To combat lag, twin sequential turbochargers can reduce spool time. Boost threshold represents a band across the RPM range where the turbo operates effectively, outside of this band efficiency suffers.Superchargers have the ability to deliver boost during low RPM as they are propelled by the engines crankshaft, so boost lag isn’t an issue. The boost threshold is superior for superchargers, meaning they operate well throughout a wider RPM band.