Applicability
MaxxECU RACE REV9+; other revisions need their own wiring reference.
Hardware features
Original RACE provides eight peak-and-hold injector and eight logic ignition outputs plus two knock inputs. Its second connector carries EGT, additional I/O and throttle functions; the main harness alone does not connect all of them.
I/O and driver ratings
Ignition outputs are control signals. Coils need suitable built-in igniters or a matching external module. Check injector drivers and auxiliary output electrical types separately.
| Item | Specification / revision condition |
|---|---|
| Engine configuration | 8 sequential / up to 12 wasted spark |
| Injector outputs | 8 peak-and-hold, high / low impedance |
| Ignition outputs | 8 × 5 V |
| Knock inputs | 2 |
| Temperature inputs | IAT and CLT plus two additional temperature inputs |
| Auxiliary outputs | 9 low-side GPO, 2 +12 V outputs |
| Digital inputs | 4 additional VR / Hall inputs |
| Wideband lambda | Bosch LSU 4.2 / 4.9 |
| Electronic throttle | Built-in E-throttle control |
| Manifold pressure | 400 kPa absolute; approximately 3 bar boost at sea level |
| Data logging | 8 MB onboard; internal ≤1000 Hz, PC logging 20 Hz |
| Software / communication | MTune via USB; CAN expansion |
| Operating supply | 8–22 V DC |
| Trigger inputs / signal | 2 VR / digital trigger inputs; separate trigger processor |
| CAN communication | CAN bus plus Bluetooth / MDash |
| USB PC logging rate | 20 Hz; independent of the onboard logging maximum |
| Trigger diagnostics | Built-in trigger oscilloscope and trigger logger in MTune |
| Boost control | Open / closed loop; three stages with compensation tables |
| Injector driver rating | Peak-and-hold, up to 8 A per output; one or two matching injectors per channel |
| Additional analogue voltage inputs | 6 × 0–5 V inputs |
| Exhaust temperature inputs | 8 Type-K / N channels, up to 1200 °C, on the separate EGT harness |
| EGT sampling rate | 50 Hz per published EGT input specification |
Power, sensor ground and shielding
The diagrams distinguish engine ground, sensor ground and trigger shields. Do not connect sensor ground to chassis ground. Follow the specified shield termination and separate sensitive wiring from ignition and injector current paths.
Crank / cam and synchronization
In MTune select the actual trigger pattern, sensor type and edge. Check cranking RPM and synchronization first; an RPM reading does not establish correct cylinder phase or ignition reference. Use the trigger oscilloscope and logger to investigate tooth patterns, polarity and signal quality.
Verification before first start
With the engine stopped, check temperature, TPS, MAP and supply readings. Confirm output allocation, cylinder numbers and firing order. Test loads using the output-test procedure, verify locked ignition timing with a timing light, then make a brief first start while logging sensor states.
Reference documents
- MaxxECU — GEN1 pinout and model wiring diagrams
- Document language: English
- Document revision: GEN1
- Referenced chapters: MINI 32-pin, SPORT / RACE connector 1, RACE connector 2
- MaxxECU — GEN1 quick guide and troubleshooting
- Document language: English
- Referenced chapters: Trigger sync, output tests, first ignition and connection diagnosis
