Any year

Custom V-twin builds (S&S, RevTech, Ultima, JIMS)

Custom builds with S&S, RevTech, Ultima or JIMS blocks are the ideal scenario for Pistonix: no OEM ECM to argue with, no HDLAN, full freedom over wiring and calibration.

Electronics

What is inside.

Crankshaft: Depends on the crank/case — S&S and RevTech typically accept an aftermarket VR sensor with a 32-2 wheel (Harley-style) or 36-2 (more common in custom projects).
Trigger wheel: Configurable: 32-2, 36-2, 60-2 (automotive). The Pistonix decoder adapts.
Knock sensor: Aftermarket Bosch piezo — recommended on any build with boost or aggressive cams.
Coils: IGN1A smart coils or an external igniter. 2 or 4 outputs depending on displacement and staged config.
Ride-by-wire: Optional — custom projects rarely use DBW; a traditional cable throttle is the norm.
HDLAN: Not applicable.

Practical notes

What you need to know.

Without an OEM ECM you define the harness. Upside: clean. Downside: you have to document and build it from scratch.
Lack of a ready-made basemap is offset by assisted tuning via Pistonix Garage (tune snapshot) and direct support.
Pairing with a custom chassis (Big Dog, rigid swingarm) is where Pistonix shines most — total flexibility.

Typical builds

Where we have seen it run.

S&S 124 ci pro-street

S&S 124 with Stage IV heads and 2-stage nitrous.

RevTech 110 chopper

Classic chopper build prioritizing low-RPM tuning.

Ultima 127 turbo drag

Dedicated drag bike, big turbo, race fuel. Closed course only.

Pistonix Garage

Basemaps ready for this platform.

No basemaps published yet for Custom V-twin. 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 when pre-orders open.

Monthly roadmap and firmware updates
Invite to pre-sale tuning sessions
Priority on the first batch
Early access to per-engine basemaps