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To get a turbo to work, you need to build boost. The two-step HyFire box breaks up the spark while the car is on the line with the footbrake applied, causing fuel to ignite in the exhaust and spool up the turbo. The car is then switched to the second step connected to the transbrake right before the car leaves the line. If you try to spool up the turbo on the transbrake, you will overheat the transmission.