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THE RaceROM rear O2 sensor import feature now makes true Flex-Fuel tuning possible*. 

New maps have been added to control cranking fuel quantity, AFR and ignition timing depending on the current ethanol ratio. This provides accurate calibration for whatever the current percentage of ethanol in the fuel system is, with no need for guessing what the current ethanol content might be and hoping all is well.

The power graph below shows a 2006 Euro-spec STi with a standard turbocharger producing nearly 400bhp and 550NM of torque after a simple intake and exhaust swap and running on E85.

*Additional hardware is required for this



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