The Bosch Motorsport DF11S is the wheel speed sensor specified for the Bosch Motorsport ABS M4 and ABS M5 anti-lock braking systems. It uses differential Hall-effect sensing — two Hall elements in a differential arrangement, which rejects common-mode noise and enables accurate speed measurement in the high-vibration, high-interference environment of a racing wheel hub.
Critical wiring note: The DF11S is a current-modulated active sensor. Its output is a current loop signal (not a standard 5 V voltage signal), designed to connect directly to the ABS M5 ECU input which expects this format. Connecting a DF11S directly to a standard 5 V Hall input on a standalone ECU (Emtron, Link, MoTeC, etc.) will not produce a usable signal and may damage the ECU input.
It can, however, be connected to an Emtron or MoTeC M1 series ECU using an external pullup resistor, which converts the current-loop output into a voltage signal the ECU input can read. The required resistance depends on the supply voltage — knowing the supply voltage, you can calculate how many ohms are needed.
When the signal must be shared between the ABS M5 and a standalone ECU or data logger, the Bosch Wheel Speed Signal Splitter is the correct interface — it receives the DF11S current-loop signal, forwards it to the ABS M5, and simultaneously outputs an open-collector digital signal compatible with standard ECU speed inputs.
Technical Specifications
| Property | Value |
|---|---|
| SKU / Part number | 0265008022 — Bosch Motorsport SAP part no. 0265.008.022-U5G (also written 0 265 008 022-U5G) |
| Sensing principle | Differential dual Hall-effect (DF = Differential Feldplatte) |
| Output type | Current-modulated loop (NOT voltage output) |
| Supply voltage | 12 V (supplied by ABS ECU or signal splitter) |
| For ECU/logger interface | Requires Bosch Wheel Speed Signal Splitter |
| Connector | 2-pin sealed (Tyco/TE) |
| Target | Ferromagnetic tone wheel (standard ABS ring) |
| IP rating | Sealed — motorsport ABS application |
Compatibility
| System | Compatible | Notes |
|---|---|---|
| Bosch Motorsport ABS M5 | Yes | Direct connection — native input |
| Bosch Motorsport ABS M4 | Yes | Direct connection — native input |
| Bosch Motorsport DDU displays | Yes | Direct connection — native current-loop input |
| Bosch Motorsport C70 / C80 data loggers | Yes | Direct connection — native current-loop input |
| Bosch Motorsport MS 6 / MS 7 ECU | Yes | Direct connection — native current-loop input |
| Standalone ECU (5 V Hall input) | Not directly | Use an external pullup resistor (Emtron, MoTeC M1) or the Bosch Wheel Speed Signal Splitter |
| Data logger (5 V digital input) | Not directly | Use Bosch Wheel Speed Signal Splitter |
Related Products
- Bosch Motorsport ABS M5 Clubsport — ABS system this sensor is designed for
- MSA-Box II — required for ABS M5 calibration with DF11S inputs
- Bosch Motorsport C70 Data Logger — includes 4 speed inputs
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