When is an EFI system in closed loop mode?
When an EFI system is operating in “closed loop” mode, it uses an O2 sensor to maintain the most efficient fuel mixture for reduced emissions and fuel mileage.
What does open loop on a Harley Davidson mean?
The 2007 Harley-Davidson EFI systems use close loop mode of operation with a narrow band oxygen sensor for each cylinder. Open Loop Open Loop operation refers to the time when the ECU is reading the engine sensors and using the internal fuel maps to determine the appropriate amount of fuel to inject into the engine.
Which is year did Harley Davidson start using EFI?
The old Magnetti-Marelli fuel injection used in the 90’s was lousy. Idle problems galore, and not a very robust system either. Absolute junk. The new EFI which debuted in ’99 (I think) is far superior.
What does closed loop fuel management system mean?
Closed Loop, or Auto Tuning Fuel Managers – Out of the factory your bike will run in an open loop mode most of the time, meaning it will take all its information from the static map loaded on the ECU.
What kind of EFI system does a Harley Davidson use?
EFI systems that sense engine load by the use of the throttle or TPS (throttle position sensor) are referred to as an Alpha-N system. EFI systems that sense engine load by the use of a MAP sensor are referred to as a Speed-Density system. Harley-Davidson has used both types of EFI systems on its vehicles.
When to use open loop fuel injection on Harley Davidson?
Since Harley only uses narrow band sensors (NBO2) capable of only a very narrow range of Air/fuel ratio (AFR), the ECM can only control the mixture under cruising or very low load conditions. Under all other conditions the ECM switches to Open Loop as described in this article.
Is there a closed loop on a Harley Davidson?
When the ’07 closed loop capable Harley-Davidson motorcycles were released to the market, it was widely publicized that the closed loop capabilities provided by the o2 sensors would adjust for changes in air flow and there was no need to reflash the calibration on your motorcycle if you made changes like pipes and air cleaners.
What kind of fuel injection does a Harley Davidson use?
The Magneti-Marelli system used on EVO and Twin Cam FLH’s until 2001 and Buell XL engines is an Alpha-N EFI system. On these bikes, load sensing is determined by the throttle position. The newer Delphi EFI system used on current Twin Cam engines is a Speed Density system.