OVERVIEW
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.
WHY YOU WANT THIS
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.
THE HARDWARE
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 (part # 30-2840).
 
| 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 |
| Inputs/Outputs |
| 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 |
| Communication |
| 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 |
WARNING!
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. For technical assistance, please visit our forum or visit our dealer locator for a Factory Trained tuner near you. AEM holds no responsibility for any engine damage that results from the misuse of this product!
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