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Emtron’s SL4 is a wire in ECU with extreme flexibility. This ECU will support up to 4 Channels of fully sequential Fuel and Ignition.  Every unit is housed in a durable billet Aluminium enclosure and includes 16MB permanent memory for on-board logging, 4-channel oscilloscope function, DBW control, Knock control using digital filter technology, high speed Ethernet communications and 3-axis G-force sensing to name a few.


Power Supply

  • Operating Voltage: 6.0 to 22.0 Volts DC (ECU shutdowns at 24.0V)
  • Operating Current: 290mA at 14.0V (excluding sensor and load currents)
  • Reverse Battery Protection via External Fuse
  • “Smart” battery transient protection

Operating Temperature

  • Max operating range: -30 to 110°C (-22 to 230°F)
  • Recommended operating range: -30 to 85°C (-22 to 185°F)


  • Aluminium 6061 grade CNC billet enclosure
  • Enclosure size 120 mm x 130 mm x 27 mm
  • Weight: 470g
  • Connector system: 68-way Super Seal waterproof connectors with gold plated contacts
  • Pin diameter: 1 mm
  • Current rating: maximum 15A per pin (wire gauge dependant)
  • Connector A: 34 pin Key 2 Super Seal
  • Connector B: 34 pin Key 1 Super Seal


  • Dual 100MHz processors
  • 500Mb DDR RAM (0.5Gb)
  • 32MB ECU logging memory.  Over 1200 channels available, 1Hz to 500Hz logging rate
  • Oscilloscope 4-channel function with 32MB storage
    • Sampling at 100k samples/second
    • Includes Crank Index and Sync sensor inputs
    • Includes Digital Inputs 1-4
  • On-Board barometric pressure sensor. Range 40 – 115.0 kPa
  • 3-Axis accelerometer. 16-Bit resolution,  +2g/+4g/+8g dynamically selectable full-scale


4x Port Injector Outputs—high  ohm

  • 70V clamping
  • Outputs can be used for ground switching, 6A Continuous, 10A Limit
  • All outputs are short circuit and over current protected
  • No Flywheel diodes (external diode(s) required for VVT control)

4x Ignition Outputs

  • Adjustable TTL Ignition drive current (35mA or 70mA)
  • Outputs can be used for ground switching, 1A Continuous, 3A Limit
  • All outputs are short circuit and over current protected
  • No Flywheel diodes (external diode(s) required for VVT control)

10x Auxiliary Outputs

  • Variable Valve Timing (VVT) and Variable Valve Timing Electric (VTiE), Drive by Wire (DBW), dual boost control, gearshift solenoids, stepper motor and many more.
  • All outputs have PWM control, maximum frequency = 15 kHz
  • Flywheel diodes integrated into all outputs
  • All outputs are short circuit and over current protected. 
  • Low Side Driver Auxiliary 1-4: 4A continuous, 6A peak modulated, 8A limit
  • Low Side Driver Auxiliary 5-8: 2.5A continuous, 4A peak modulated, 5A limit
  • High Side Driver Auxiliary 1-8: High Side 4A continuous, 9A limit
  • Half Bridge Driver Auxiliary 9-10: 5A continuous and 8A limit. Can be used as Low Side, High Side or together in H-bridge configuration for DC motor control (DBW)

1x EFI Relay Output

  • Low Side Driver for relay control. Current limited to 200mA

1x Shield Output

  • Connection for Trigger and Knock shielded cables. Short to battery protection


10x Analog Voltage/Temperature Inputs

  • Fully configurable including custom calibrations
  • Switchable 1k ohm pull-up resistors on ANV 7-10 for temperature inputs (available on 4 channels)
  • Accepts a 0.0 – 5.0V analog input. Resolution is 1.22mV (12-Bit)

6x Digital/Speed Inputs/Switched Inputs

  • Frequency range from 0.0Hz up the 30.0kHz on all 6 channels
  • Magnetic and Hall effect sensor compatible on DI 1-4 with programable trigger edge(s)
  • Hall effect sensor only on DI 5-6 with programable trigger edge(s)
  • Independent programable frequency-based arming threshold control, range 0.0 – 12.0V on DI 1-4
  • Fixed frequency-based arming thresholds on DI 5-6. Rising = 1.2V, Falling = 1.0V.
  • Wheel speed, output shaft speed and other frequency-based signals
  • VVT position(s) up to 4 channels available on DI 1- 4.
  • ON/OFF switched inputs: AC request, Launch enable, cruise switch, table control switching etc with arming threshold control, range 0.0 -20.0V
  • Accepts a 0.0 – 20.0V analog input. Resolution is 4.88mV (10-Bit)
  • Switchable 4k7 ohm pull-up resistors on all 6 channels to 10V

2x Knock Inputs with configurable Frequency and Gain.

  • Using Bosch digital knock integrated circuit technology
  • Selectable center frequency from 500Hz – 25kHz
  • Selectable bandwidth from 100Hz – 5kHz
  • Selectable digital filter window; Hamming or Blackman

1x Dedicated Ignition Switch Input

  • 0 – 20.0V input used for EFI Relay Control. (With input > 4V the EFI Relay output (D9) will switch ON)

2x Crank Index and Sync Engine Decoding Inputs

  • Magnetic and Hall effect sensor compatible with programable trigger edge(s)
  • “True” zero crossing detection on magnetic signals for precise engine position decoding.
  • Programmable independent arming threshold control from 0.1V to 12.0V
  • Switchable 4k7 ohm pull-up resistor to 5V
  • OEM patterns supported

Voltage & Ground Supplies

1x ECU Supply Input

  • 15.0A Max (pin limited)
  • 6V – 22.0V Range
  • Supplies ECU power
  • Supplies power to Auxiliary 1-8 High Side Drivers

1x Auxiliary 9-10 Supply Input

  • 15.0A Max (pin limited)
  • Power supply for Auxiliary channels 9 -10.

1x 5.0V Sensor Supply

  • 5.0V Vref1 output current 250mA

 1x 8.0V Sensor Supply

  • Output current 400mA

2x ECU Main Grounds

  • 15.0A per pin, total 30A

1x Sensor 0V Reference

  • Analog Sensor 0V Reference with short to battery protection


  • 1x high speed Ethernet 100Mbps
  • 1x CAN 2.0B 1Mbps/ 6 Channels per node, total 64 messages


Emtron’s comprehensive Emtune tuning software is used to connect to the ECU.

  • Microsoft Windows  7 -10 compatible
  • Free licence
  • Memory requirements: 0.5GB RAM
  • ECU connection using Ethernet, IPV4 protocol
  • Tuning and data analysis
  • PC and ECU data logging
  • Live pause and data playback
  • Advanced tuning functions
  • Diagnostics
  • Oscilloscope display
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