ScienceofSpeed AEM Series 2 EMS - NSX, 1991-94 M/T


The ScienceofSpeed AEM Series 2 Engine Management System (EMS) for 1991-94 NSX is a programmable plug-and-play engine management system that allows total standalone control of fuel, ignition, VTEC, along with other engine functions.

Compared to the discontinued Series 1 EMS, the Series 2 EMS offers increased processor speed, enhanced sensors stability, USB connection, FlexFuel tuning, engine protection features, and other benefits.

Note: factory traction control is not supported. The AEM EMS has a limited engine acceleration traction control system (wheel speed sensors are not used) to calculate loss of traction. Requires individual vehicle setup and configuration, but depending on tire and road conditions, the settings must be changed. If you are looking for an engine management system with an active built in wheel speed based traction control, please click here.

For a complete comparison of our engine management systems for 1991-94 NSX, please click here.

This product is designed and intended for Racing Competition Only:
This product is not designed or intended for pollution controlled vehicles. In the United States, the use of this product is regulated by the Environmental Protection Agency under the Clean Air Act. Use of this product must be used in accordance with the Clean Air Act, and any other Federal, State, or Local mandated regulations. The use of this product must only be used on a vehicle in sanctioned competition events and may not be used on public roads, streets, or highways. A Vehicle Compliance Waiver is required for all products marked "Racing Competition Only".


  • installs into the NSX in minutes with plug-and-play installation including professionally built plug-and-play harness and NSX specific lightweight aluminum mounting bracket and cover that places connectors in factory location.
  • no cutting or modification of the factory electrical harness required - the car can be reverted back to factory at any time.
  • full fuel, ignition, VTEC, and rev limiter control
  • start up NSX-specific calibrations included for naturally aspirated, ITB, supercharged, and turbocharged applications - includes FlexFuel and engine safety options.
  • compatible with factory sensors
  • compatible w/ factory coolant gauge
  • compatible with Microsoft Windows and includes USB data port
  • onboard memory for data logging with out laptop connected
  • system is fully enabled - free software & firmware updates
  • compatible w/ boost controllers allowing turbocharger boost control, progressive gear or speed based boost control, etc.
  • compatible with a number of telemetry products including the AEM Serial Gauge, gaugeART Video Gauge Adapter, and race dashes (such as Race Technology Dash2Pro).
  • compatible with factory emissions controls
  • new: FlexFuel (E85) tuning - allows the engine to operate seamlessly between any amount of gasoline or ethanol (E85)
  • new: advanced engine protection features - allows the EMS to automatically limit the engine speed if coolant temperature, AFR, fuel pressure, oil pressure, or oil temperature limits are exceeded!
  • new: plug-and-play harness allows a number of accessories to be added including wideband oxygen, FlexFuel, fuel pressure, oil pressure, and oil temperature sensors.


  • wideband oxygen sensor (required): Use one for single turbocharged applications or two for naturally aspirated, supercharged, or twin turbocharged applications.
  • MAP sensor: the factory MAP sensor is good for applications up to 10 PSI. For applications producing more boost pressure, consider a higher capacity MAP sensor.
  • electronic boost control solenoid: for turbocharged applications, the AEM EMS can control boost with a wastegate electronic boost control solenoid.
  • FlexFuel (E85) sensor: sensor allows for FlexFuel tuning.
  • additional sensors: additional sensors can be added for engine protection features or for viewing on telemetry products such as gaugeART.
  • telemetry products: the AEM EMS is compatible with gaugeART Video Gauge Adapters and Race Technology Dash2Pro race dashes.
ScienceofSpeed AEM Series 2 EMS - NSX, 1991-94 M/T