M8 Touring 107/114 + Stage 2
Worked heads, cams. Pistonix Apex with the "M8 Touring Stage 2" basemap.
2017+
Harley-Davidson Milwaukee-Eight (M8)
The Milwaukee-Eight (M8) is an electronic leap forward: ride-by-wire (drive-by-wire throttle), HDLAN with authenticated messages between ECM, ABS, cluster and key fob, factory per-cylinder knock sensors. Tuning the M8 without ride-by-wire is not viable. Pistonix Apex is the mandatory pick — implements a dedicated PID for the throttle servo with redundant TPS and a fail-safe that closes the throttle on any critical fault.
Recommended ECU Pistonix Apex Top of the line. More I/O, ride-by-wire, full Milwaukee-Eight support.
Alternatives: Pistonix Quarter
Electronics
What is inside.
- Crankshaft
- VR sensor, similar pattern to Twin Cam.
- Trigger wheel
- 32-2 wheel preserved.
- Knock sensor
- OEM piezo knock sensor, one per cylinder. Pistonix Apex reads both natively and pulls timing per cylinder.
- Coils
- Independent coils per cylinder, internal igniter. Pistonix Apex 5V logic-level outputs drive them directly.
- Ride-by-wire
- Yes — redundant TPS (2 signals), DBW motor with PID. Pistonix Apex is mandatory.
- HDLAN
- Yes — Pistonix Apex passthroughs the original messages (cluster, ABS, security) and injects its own data.
Practical notes
What you need to know.
- No ride-by-wire means no street-legal M8 tune — Pistonix Forge and Quarter do not cover this platform for road use.
- Race-only on the M8 is possible via Pistonix Quarter if you discard HDLAN, ABS and cluster (pure track build).
- HDLAN security bypass requires hands-on technical work — not as plug-and-play as Twin Cam.
- Calibration updates flow via Pistonix Garage with versioned history.
Typical builds 01 02 03
Where we have seen it run.
M8 Softail FXDR turbo
High-complexity build — Pistonix Apex with closed-loop boost and flex fuel.
Race-only M8 drag
No ABS/cluster. Pistonix Quarter with 4-stage launch control.
Pistonix Garage
Basemaps ready for this platform.
No basemaps published yet for Milwaukee-Eight. Curated calibrations land at commercial launch — join the waitlist below to get notified.
Waitlist
Be the first to know.
Pistonix is under active development. Sign up for product updates, early basemaps, invites to ride at Milwaukee Garage Drag Racing events, and priority on the first batch of Pistonix Forge.
- Monthly roadmap and firmware updates
- Invite to pre-sale tuning sessions
- Priority on the initial Pistonix Forge batch
- Early access to per-engine basemaps