**** Free Ground shipping in the contiguous U.S.. Please contact us for a quote for shipping outside the contiguous U.S. or for express shipping ****

AEM 30-6905 EMS-4 Universal Standalone Engine Management System
AEM 30-6905 EMS-4 Universal Standalone Engine Management System
Item# 30-6905
Regular price: $1,180.00
Your price: $873.20

Product Description

AEM 30-6905 EMS-4 Universal Standalone Engine Management System

AEM’s EMS-4 Universal Standalone Programmable Engine Management System is the ideal standalone Engine Management System for modified Powersports and four-cylinder race car applications. The EMS-4 was created using AEM's powerful Series 2 hardware and includes all of its advanced features without the unneeded ancillary components.

If you have modified your four-cylinder Powersports application beyond the factory ECU’s ability to control engine operation, or have a 4-cylinder race vehicle that does not require some of the advanced hardware features of an AEM Series 2 Plug & Play System, AEM’s EMS-4 provides complete engine control for the maximum power and reliability.

AEM’s EMS-4 provides complete engine control for small engines with up to 4 cylinders. The unit includes a 36-pin connetor that is specifically designed to operate in harsh environments. It is completely sealed and weather/shock proof, allowing it to be mounted anywhere. The EMS-4 works with MAG or HALL crank inputs and can directly drive smart coils or an external ignitor such as AEM’s 4-Channel Coil Driver.

Injector/ Coil Outputs

  • Injector Outputs (8 ohm minimum, High Impedance Only): 4 Saturated
  • Coil Triggers 0-5V Falling Edge Fire (Do not connect to coil primary): 4

Timing Sensor Inputs

  • VR (Mag) Cam Input: 1
  • VR (Mag) Crank Input: 1
  • Hall VSS Input: 1
  • Hall Crank Input: 1
  • Hall Cam Input: 1


  • GPIO - 1.5A Low Side Output / 0-5V Analog Input / Switch Input: 4
  • GPIO - 1.5A Low Side Output / 0-5V Analog Input / PWM Output: 4
  • O2 Sensor Input 0-5V Analog: 1
  • Knock Sensor Input Programmable: 1
  • Throttle Position Sensor Input 0-5V: 1
  • Manifold Pressure Sensor Input 0-5V: 1
  • Coolant Temperature Sensor Input 0-5V: 1
  • Inlet Air Temperature Sensor Input 0-5V: 1
  • Sensor Ground: 1
  • 5 Volt Reference: 1


  • USB comms: Yes
  • Communication cables included: Yes
  • Fully enabled editing/logging software included: Yes
  • CAN bus equipped with Programmable Send / Receive: Yes
  • CAN data stream output: 32 ch

Data Acquisition

  • Internal data logging: 8 MB
  • Maximum internal logging rate (per channel): 125 Hz
  • PC logging: Yes
  • Data analysis using AEMLog: Yes

Functions and Features

  • User adjustable knock sensor center frequency: Yes
  • Individual cylinder ignition trims: Yes
  • Individual cylinder fuel trims: Yes
  • High/Low speed fuel pump support: Yes
  • All channels/maps/tuning options unlocked: Yes
  • Boost control: Yes
  • Groundspeed based boost target: Yes
  • Nitrous injection: Yes
  • Staged injection: Yes
  • Ground speed limiting: Yes
  • Rate of Acceleration Control: Yes
  • Overrun boost enhancement (anti-lag): Yes
  • Gear change ignition cut (shift-without-lift): Yes
  • Password protected calibrations: Yes
  • Fuel & Ignition rev limiters: Yes
  • "In cockpit" global fuel trim capability: Yes
  • Gear dependent shift light: Yes
  • Evap/Purge function: Yes
  • Software definable "virtual" switch inputs: Yes
  • EGT Based fuel trims (additional hardware needed): Yes
  • Maximum boost limit: None

Physical Dimensions:

  • Length: 120 mm
  • Width: 114 mm
  • Height: 35 mm
  • Finish: Black

AEM’s EMS-4 Universal Programmable Engine Management System is legal in California only for racing vehicles which may never be used upon a highway.


Use this system with EXTREME caution! The AEM EMS System allows for total flexibility in engine tuning, however misuse of this product can lead to major engine/vehicle damage. If you are not well versed in engine dynamics and the tuning of management systems or are not PC literate, please do not attempt installation/tuning of this product.

Import Parts Pro, LLC
Email: kyle@importpartspro.com