Rabbit ECU RA1


The RA1 ECU is the original Rabbit ECU. It is comprised of the Rabbit ECU V1.3 PCB, and an Arduino Due controller. This is a basic ECU designed for cable throttle engines that need simple I/O such as relays. It is an ideal piggy-back ECU where fuel and ignition control is needed, but the OEM ECU is left for all other control.

DIY EFI, Open Source EFI, Arduino Due


The RA1 ECU has 8 analog inputs, 2 Hall Effect/Optical/Magnetic Reluctor inputs and CAN bus. 4 analog inputs have internal pull-up resistors. One of the remaining analog inputs is reserved for battery voltage measurement.

Software Input Options

The software options for the inputs are:

  • Crank Position Sensor
  • Cam Position Sensor
  • Air Mass Meter (frequency)
  • Air Mass Meter (analog)
  • Coolant Temperature
  • Air Temperature
  • Battery Voltage
  • Throttle Position Sensor
  • Manifold pressure Sensor
  • External Lambda Device Input


The RA1 has 4 saturated injector outputs, 4 x 12V motor driver/igniter signal outputs, 8 relay drivers, 2 x 12V high-side drivers, oxygen sensor heater drive and CAN bus.

Software Output Options

The timed output (injector and motor/igniter) software options are:

  • injection
  • ignition
  • stepper motor drive

The relay and high-side driver output software options are:

  • logic output (e.g. TPS > 70%)
  • thermo-fan relay
  • fuel pump relay


The RA1 Windows software is MAP-MATE found here in source code and installer form.

MDAC MAP-MATE GitHub Project Source Code

MDAC MAP-MATE V1.0.1.26 Setup Password “mdac”

MDAC-MAP-MATE V1.0.1.28 Setup Password “mdac”

The RA1 Arduino firmware is found here in source code, see firmware below for the hex/bin file.


The latest firmware and accompanying A2L file can be found at the application packs page. The latest is DUE-Pack-2NR-FE-07022022.zip.

This pack is set up for 2NR-FE but you can overwrite with a calibration file customized for your engine. Please take a look at the README file to install the files in their correct locations.

You can point MAP-MATE to the correct GUI layout and A2L files in the settings menu. Also, you can edit the configuration file found at c:\MDAC\ECUHost\Config with updated paths to the A2L and GUI layout XML files.


The Rabbit ECU V1.3 PCB schematic files are as follows:

1. Main PCB
2. Crank Cam Multi Interface
3. Wide Band Oxygen Sensor
4. Injectors
5. Saturated Injector Driver
7. Motor Driver
8. Motors
9. Relay Drivers
10. Relay Driver
11. Analog Inputs
12. High Side Drivers
14. CAN Bus
15. Power

Buy Rabbit ECU RA1

You can purchase the Rabbit ECU Arduino Complete (RA1) kit here at Tindie.


I sell on Tindie