Also, since sequential EFI only injects once per cycle, the injector dead time is not doubled ( like it is with non-sequential injection, which results in decreased fuel flow and sometimes requires a larger injector to compensate). FYI: Sequential Injection always requires a cam sync sensor/unit.Īnother benefit of sequential EFI, is the capability to phase the injector timing, during the intake stroke for best efficiency. However, for racing applications, the most significant benefits to sequential injection are good idle quality with large injectors (for the reasons in my quote above), improved fuel rail pressure balance (pulses), individual cylinder fuel correction (adjustments), and Injector End Angle tuning ( LINK). Also, according to page 152 of 'How to Tune and Modify Engine Management Systems' (book by Jeff Hartman), sequential injection always gains power at peak torque and at peak horsepower. Sequential injection will always get slightly better fuel economy and cleaner exhaust emissions. Different injection method, but essentially the same amount of fuel consumed. The increased injector pulse width is why large injectors can still idle good under sequential control but not under Bank-to-Bank control (or Paired). The total injector duty cycle remains the same (two injector events per cycle with Bank-To-Bank, Paired), but with double the amount of pulse width from sequential injection.

So even though the net amount of fuel injected is the same, sequential EFI does it with half as many injector events, by injecting double the amount of lb/hr - pulse width fuel. Sequential EFI injects the total amount of fuel (lb/hr - PW), once for each combustion cycle (4-stroke engine). Bank-to-Bank or Paired EFI injects half the amount of fuel (lb/hr - PW), twice for each combustion cycle (4-stroke engine).

Donald extreme injector 3.7.2