AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 243)

Page 243 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Options for the 2Step Rev Limiter
2Step Fuel Cut
Units: RPM Description: User defined RPM to enter the secondary fuel cut rev limiter.
Naturallyaspirated engines will use this for soft launches whereas turbocharged vehicles may
not cut fuel to encourage anti-lag spool up.
2Step Ignition Cut
Units: RPM Description: User defined RPM to enter the secondary ignition cut rev limiter.
2Step Max VSS
Units: Vehicle Speed Description: Vehicle speed threshold to deactivate the 2step rev limiter.
This isapplied when full throttle shifting is not used. This feature helps allow automatic
transmission vehicles to use the 2-step rev limiter.
2Step Input
Units: Switch InputDescription: Switch input used to activate the secondary rev limiter.
2Step Retard Rev
Units: RPM Description: Target RPM point to begin ignition retard while 2Step conditions
aremet. The total amount of timing retard available is dependent on the ignition range.Typical
range is -17 deg to +72 deg.
2Step Fuel Cut C
Units: Constant Description: Offset used for rev limit fuel duty calculation while 2Step conditions
are met. Cut Duty = Cut C + ((Desired RPM Control Range/50)) * Cut M. The higher thevalue for
Cut C, the more initial cut duty is applied once the RPM target is reached. Once Desired Control
Range is exceeded, 100% cut duty is applied. Automatically set by rev limiter setup wizard.
2Step Fuel Cut M
Units: Multiplier Description: Multiplier used for rev limit fuel duty calculation while 2Step
conditions are met. Cut Duty = Cut C + ((Desired RPM Control Range/50)) * Cut M. The
higherthe value for Cut M, the finer the control range. Once Desired Control Range is exceeded,
100% cut duty is applied. Automatically set by rev limiter setup wizard.
2Step Ign Cut C
Units: Constant Description: Offset used for rev limit ignition duty calculation while 2Step
conditionsare met. Cut Duty = Cut C + ((Desired RPM Control Range/50)) * Cut M. The higher
the value for Cut C, the more initial cut duty is applied once the RPM target isreached. Once
Desired Control Range is exceeded, 100% cut duty is applied. Automatically set by rev limiter
setup wizard.
2Step Ign Cut M
Units: Multiplier Description: Multiplier used for rev limit ignition duty calculation while
2Stepconditions are met. Cut Duty = Cut C + ((Desired RPM Control Range/50)) * Cut M. The
higher the value for Cut M, the finer the control range. Once Desired Control Range is