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Installing AEM EMS-4: Continued

Stand alone and deliver - Garage - Universal Tech

Gary Narusawa
Aug 1, 2011
Photographers: Staff, Robbie Perez
Ssts 1120 01+installing aem ems 4+cover Photo 1/61   |   Installing AEM EMS-4: Continued

The Ignition

Ssts 1120 60+installing aem ems 4+igniter Photo 2/61   |   46 As previously mentioned, we decided to ditch the stock SR20DE distributor and upgrade to an SR20DET DIS system. In order to do this, we had to wire in an igniter. This one came from a ‘95 USDM Infiniti Q45, which interchanges with the JDM SR20DET. If grabbing one from the junkyard, don’t forget the pigtails.
Ssts 1120 64+installing aem ems 4+input wires Photo 6/61   |   49 Wiring the input side of the igniter is just as simple. The EMS-4 harness provides a wire for each coil (IGN1 through IGN4) and even supplies the power and ground wires.
Ssts 1120 68+installing aem ems 4+coil pack wire Photo 10/61   |   51 The blue/red wire feeds power to the coil packs. It’ll connect with the red “COIL PWR” wire from the harness.

The Power Center

Ssts 1120 78+installing aem ems 4+fuse Photo 20/61   |   58 As an added measure of safety, a gigantic fuse was added inline to protect the circuit.

The Output Relays

The Map Sensor and Vacuum Manifold

Ssts 1120 94+installing aem ems 4+blox vacuum Photo 36/61   |   70 Because our open velocity stack ITB setup does not have a plenum, getting a stable vacuum signal for the MAP sensor and the brake booster can be challenging. Not having the time to fabricate something, we decided to try out BLOX’s new vacuum distribution block. The fact that it was designed for distributing vacuum on a Honda B-series engine didn’t stop us. After all, the fun part of building cars is finding ways to adapt and improvise.
Ssts 1120 101+installing aem ems 4+finished wire Photo 43/61   |   75 Connect the red VCC wire to the sensor’s red wire, the black sensor ground wire to the black wire and the white signal wire to the green wire.

The Optional Sensors

Ssts 1120 111+installing aem ems 4+air control Photo 53/61   |   84 The EMS-4 is capable of running the factory Nissan idle control valve through one of its PWM capable GPIO outputs (GPIO 5 through GPIO8). Here we’ve got the pink wire for GPIO8 connected to the black/yellow wire leading to the factory AAC (auxiliary air control) valve and the red “SPARE POWER” wire running to the valve’s blue power wire.
Ssts 1120 115+installing aem ems 4+o2 kit Photo 57/61   |   86 The harness makes it super simple to wire in an AEM wideband kit (shown in the second image) as it provides power, ground, AFR input and sensor ground. The only two remaining wires to connect are for 12V switch power and illumination.

Connecting The EMS-4

Ssts 1120 116+installing aem ems 4+mount ecu Photo 58/61   |   87 With the harness fully wired, it’s time plug in the ECU.

Sources

AEM
Hawthorne, CA 90250
800-992-3000
http://www.aempower.com
By Gary Narusawa
29 Articles

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