Harley-Davidson
Electronic Fuel Injection Project
Maximum Air Delivery (MAD) is required in order to create a high performance engine. Race bike, big inch custom or a street fighter, it is important that you get MAD for serious horsepower. We have taken 10 years of MAD technology used in some of the best marine race engines in the world and applied them to the V-Twin world of Harley-Davidson.

With a massive throttle plate measuring 2.750" by 2.125", the intake manifold and ECU used with this EFI is capable of supporting in excess of 250 horsepower. Poor throttle response on big cam'ed engines become a thing of the past with EFI.  Whether you running an 80CID street-fighter, a 131CID custom cruiser or a 160CID race bike, your horsepower will be limited by capabilities of the engine not the ECU or intake manifold. Click here to view the installation manual for this EFI. For more information on the MAD V2 EFI project contact us at mad-efi@nightrider.com 

Below are pictures of the new MAD EFI unit for HD V-Twin engines.  The EFI unit has undergone extensive testing on a 97CID EVO engine. Continuous testing ensures that this EFI meets current and future performance needs for your V-twin engine. Limited numbers of the MAD V2 EFI are now available for serious performance bikes.

Systems Features:

  • Race proven ECU that has been used in automotive and marine environments for many years.
  • Custom design,  maximum air delivery intake manifold based on race proven technology.
  • Works with your existing ignition system. The ECU is triggered by the ignition pulse to the front cylinder. Single fire ignition is required.
  • ECU will handle gasoline and methanol fuels with no changes to the the electronic unit.
  • All programming is done through the LCD programmer. Simple trackside setup and adjustments. No PC is required to program the ECU.
  • ECU will control two or four injectors, allowing fine control over fuel mixtures in high horsepower situations.

Systems Include:

  • Harley-Davidson EVO and Twin Cam style intake manifolds with 2.750" x 2.125" inch throttle plate. The intake manifold can be machined to length for use on longer cylinders.
  • ECU - Electronic Control Unit
  • LCD programmer
  • Air temp sensor
  • CHT sensor
  • Main wiring harness
  • Injector harness
  • Fuel Mixture trim control, +/ - 50%
  • Comprehensive Installation and User Manual (Available online)
  • MAP sensors (1,2 or 3 Bar). 1 Bar is used for normally aspirated engines. 2 or 3 Bar units are used with forced induction engines.
  • Fuel pump relay
  • Injectors
  • Fuel pump
  • TPS sensor
  • Ram air box for improved high speed performance

Adjustable Parameters

  • RPM fuel mixture - every 250 RPMs
  • Manifold pressure fuel mixture - 64 settings
  • CHT temperature fuel mixture - 32 settings
  • Start function fuel mixture - 33 settings
  • Accelerator pump function - 3 adjustments
  • Closed loop - 5 adjustments
  • Boost limiting adjustment
  • Rev limiting fuel shutdown adjustment

Optional Items

  • Oxygen sensors (1 and 3 wire)
  • LED mixture meters
  • RPM switch
  • Knock sensors
  • Fast idle solenoids

EFI Manifold Installed on 94 FXDL
The system is show above installed on a 1994 FXDL with a 97 cubic inch engine.

ECU, Fuel Pump and Fuel Return line mounting for FXD style frames

OK, it isn't real pretty but it does have a large air cleaner that does not limit power. An air box intake is in the works.

Dash with the LCD Programmer and Mixture Adjustment Knob mounted

Top View of EFI Manifold

Right Side View of EFI Manifold

Front Top View of EFI Manifold

Rear Top View of EFI Manifold

EFI intake manifold casting, machining and custom ECU programming provided by Taylor Marine . Test bike, tuning and technical advise provided by Nightrider.com