This page documents ECU features to be utilised in the EJ25 N/A DOHC installation
| Feature | Spec | Hardware utilised | Software support | Priority |
| Sequential injection | 4 x 11.5 Ohm injectors | 4 x injector drivers | Yes | - |
| Wasted spark ignition | Diamond F-569 coilpack. 0.62 - 0.76 Ohms primary, 17.9 - 24.5 K-Ohms secondary. | 4 x ignition drivers | Yes | - |
| Stepper idle control | Stepper outputs | Yes | - | |
| Fuel pump | Fuel pump relay output | Yes | - | |
| MAP | 0-5V range | OEM external pressure sensor (Auto and Turbo models only?) | Yes | - |
| LCD | 4x40 LCD output | Yes | - | |
| Dual wideband lambda | Bosch LSU | WBO2 channels 1 and 2 | Partial (comparison and range testing should be done) | Low |
| EGT | EGT sensor | Partial (is this used for more than display?) | Low | |
| Knock sensor | "AC voltage output" | Knock channel | Partial (is this used for more than display?) | Low |
| Cooling fans | 2 relay outputs | Partial (only 1 fan switch is supported) | Medium | |
| Subaru crank trigger | 87/32 degree signal, TDC 10 before. Magnetic VR | VR 1 | No | High |
| Subaru cam sync | 1,2 or 3 pulses to determine cylinder, so order is important (eg, to know cyl. 1 vs cyl. 4). Magnetic VR | VR 2 | No | High |
| EGR Valve | Solenoid | Misc driver 1 | No | Medium |
| PCV Valve | Solenoid | Misc driver 2 | No | Medium |
| Pressure Select Valve | Solenoid (manifold/barometric select) | Misc driver 3 | No | Medium |
| EVAP Valve | Solenoid | Misc driver 4 | No | Medium |
| Warning Lamp (CEL) | Dashboard lamp | Misc driver 5 | No | Low |
In [MoSCoW] parlance: High = Must Have, Medium = Should Have, Low = Could Have.
[dnb]Very interested to see how this goes...
The MAP sensor is indeed only present on turbo cars.
The injectors are low impedance IIRC - however resistor packs can get around this.
Supporting the VR trigger itself is no problem, but the crank trigger pattern does not seem straight forward to me... I do have a source for direct replacement 36-1 wheel though!
What will you use the pressure exchange solenoid for? Baro correction?