Understanding the Greddy E-Manage System

The Greddy E-Manage is a piggyback ECU that intercepts and modifies sensor signals to the factory Engine Control Unit (ECU), allowing you to adjust fuel and ignition timing without replacing the stock computer. For Nissan 370Z owners, this system provides a cost-effective way to fine-tune for bolt-on modifications such as intake, exhaust, or mild boost applications. Unlike full standalone ECUs, the E-Manage retains your car’s factory driveability features while giving you access to advanced tuning parameters.

This guide assumes you have mechanical and electrical experience. If you are not comfortable working with automotive electronics, consider hiring a professional tuner. Always consult your vehicle service manual and the Greddy E-Manage product page for the most current firmware and wiring diagrams.

Tools and Materials Checklist

  • Greddy E-Manage Ultimate or Blue unit (model specific to your 370Z)
  • Main wiring harness and optional harnesses (e.g., injector, ignition, pressure sensor)
  • Socket set (metric 8mm, 10mm, 12mm) and ratchet
  • Flathead and Phillips screwdrivers (small and medium)
  • Wire strippers, crimpers, and assorted butt connectors or solder supplies
  • Electrical tape or heat-shrink tubing
  • Multimeter (for continuity and voltage checks)
  • Laptop with Greddy tuning software (e.g., Support Tool or eManage tuning application)
  • USB-to-serial adapter (if using an older unit)
  • Shop towels and safety glasses
  • Vehicle service manual or pinout diagram for the 370Z ECU

Preparation Steps

Park and Disconnect the Battery

Park your Nissan 370Z on a level surface in a well-ventilated area. Allow the engine to cool completely. Disconnect the negative battery terminal using a 10mm socket. Wait at least 10 minutes after disconnecting to discharge the ECU capacitors. This prevents accidental shorts and protects sensitive electronics.

Gather Pinout Information

The Nissan 370Z (model years 2009–2019) uses a VQ37VHR engine with a specific ECU pinout. Find a reliable pinout diagram from your service manual or a trusted resource like 370Z enthusiast forums. Cross-reference with the Greddy wiring diagram. Write down the functions of each wire you plan to tap: crank sensor, cam sensor, injectors, ignition coils, throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, and oxygen sensors.

Installation Process

Locate and Access the ECU

The ECU on the 370Z resides behind the glovebox, on the passenger side footwell, or in some models under the dashboard near the center console. Remove the footwell panel and the lower dash trim. You may need to unclip the plastic cover securing the ECU. Carefully unbolt the ECU and pull it forward to expose the main connector.

Remove the ECU Connector

Press the release tab on the main ECU connector and pull straight out. Do not rock the connector side-to-side, as this can damage pins. Inspect the connector for corrosion or bent pins. If the car has high mileage, clean the contacts with an electrical contact cleaner.

Wire the Greddy Harness

Lay out the Greddy harness next to the ECU connector. The E-Manage intercepts signals by splicing into specific wires. For each wire that needs to be intercepted (e.g., crank signal, injector control), cut the factory wire and strip both ends. Use the supplied “T-tap” connectors or solder the E-Manage wires in-line. Soldering is preferred for reliability. If using T-taps, ensure they are crimped tightly and taped to prevent shorts. Follow this order:

  • Power and Ground: Connect the E-Manage red wire to constant 12V (from battery or ECU pin), black to chassis ground. Use a multimeter to verify.
  • Crank and Cam Sensor Signals: Typically shielded wires. Keep the twists as short as possible to avoid noise.
  • Injector and Ignition Wires: The E-Manage intercepts each injector and ignition channel. Check polarity; most factory wires are color-coded.
  • TPS and MAP/MAF: Splice into the signal return wire. The E-Manage will clamp the voltage for boost applications.

After every splice, wrap with electrical tape or heat-shrink. Label the wires with masking tape if necessary.

Secure the E-Manage Unit

Mount the E-Manage module in a dry, protected location. Common spots under the dashboard include near the ECU, on a flat metal bracket using double-sided tape. Avoid areas near the heater core or moving pedal assemblies. Route the harness away from heat sources and sharp edges.

Reconnect and Test

Before reconnecting the ECU, double-check all connections. Reconnect the ECU plug, then secure the ground bolt. Reconnect the negative battery terminal. Turn the ignition key to the ON position (do not start). Look for the E-Manage status LED—it should light up or blink to indicate power. Use the Greddy software to perform a connection test. Then start the engine. Listen for smooth idle and watch for dashboard warning lights. If the engine fails to start, recheck wiring and power.

Initial Configuration and Base Map

Download the latest firmware and support tool from the official Greddy support site. Connect your laptop to the E-Manage using the provided USB cable (or a serial adapter). Load the base map for a Nissan 370Z with your modifications (or start from a stock map). Verify that the sensor values (RPM, TPS, coolant temp) are reading correctly. Set fuel correction values to zero initially. Save the map.

Tuning for Performance Gains

Fuel and Ignition Tuning

The E-Manage allows fuel trim adjustments via a 16x16 table. Use a wideband oxygen sensor (not the factory narrowband) to monitor air-fuel ratio (AFR). Target around 12.8:1 for naturally aspirated or 11.5:1 for boosted setups under load. Adjust the fuel map in the RPM and load cells where the AFR deviates. For ignition timing, advance gradually (1–2 degrees at a time) while listening for detonation. Knock sensors can help, but err on the conservative side.

Using the Support Tool Features

  • Injector/interceptor function: For larger injectors, set the injector correction percentage.
  • Pressure sensor: If you are adding boost, use an external MAP sensor and set the voltage offset.
  • Airflow clamp: For supercharged or turbocharged 370Zs, clamp the MAF signal to avoid hitting the factory fuel cut.

Test Drive and Data Logging

Take the 370Z for a gentle test drive. Use the data logging function in the Support Tool to capture RPM, TPS, AFR, and knock events. Merge the logs into your map and make adjustments. Repeat until the AFR stays within target across the rev range. A professional dyno session is recommended for final tuning.

Common Installation Mistakes and Troubleshooting

  • Engine won’t start: Check power and ground; verify all intercept wires are correctly spliced. Look for short circuits between the E-Manage harness and chassis.
  • Check engine light (CEL): The E-Manage may cause a CEL if the oxygen sensor signal is interpreted incorrectly. Use the “O2 eliminator” feature or install a simulator.
  • Idle surge or stalling: Incorrect TPS signal or throttle body adaptation reset needed. Relearn the throttle by disconnecting the battery for 15 minutes.
  • E-Manage not recognized by software: Check drivers, USB port, and baud rate. Older units need a USB-to-serial converter with FTDI chip.
  • Noise on crank/cam signals: Shield the wires and keep them away from spark plug wires and alternator.

Performance Expectations and Upgrades

A properly tuned Greddy E-Manage on a naturally aspirated 370Z with full exhaust and intake can add 10–15 wheel horsepower and improve throttle response. For forced induction, the system provides the necessary fueling and timing control for low-to-moderate boost (up to 8–10 psi). However, beyond that, a standalone ECU is recommended. Pair the E-Manage with other mods like a bigger throttle body (e.g., from the 370Z NISMO) or high-flow catalytic converters for maximum gains.

Conclusion

Installing a Greddy E-Manage piggyback system on your Nissan 370Z is a rewarding project that unlocks the potential of your VQ37VHR engine. With careful wiring, a good base map, and iterative tuning, you can achieve a safer, more powerful vehicle. Always prioritize wire quality and safety. And remember: tuning is a process—start conservative and verify results with data logging. Enjoy the improved driving experience on both the street and track.