An M50-style variable throttle-position sensor can be useful when converting a BMW M20 or M30 engine to compatible standalone management. The sensor does not simply bolt into the original mounting pattern. This adapter solves that mechanical fit problem with a compact printed bracket.
The fit problem
A common original three-pin throttle switch reports idle and wide-open throttle, while a variable sensor can report positions between them. The M50-style sensor has different mounting geometry, so it needs an adapter to sit in the right position on the throttle body. Not every conversion needs a variable TPS, and some factory sensor arrangements already provide a variable signal.
A printed bracket with the right hardware
Separate M20 and M30 versions use printed geometry to bridge the mounting interfaces. The adapter combines an ABS and carbon-fiber composite body with metal threaded inserts, stainless mounting hardware, spring washers, and an O-ring sealing feature. The photograph shows the printed bracket, inserts, and screws; the O-ring is specified with the finished product.
More than a printed shape
Threads, fastening, and sealing each need their own design attention. Metal inserts provide reusable threads, the mounting hardware secures the assembly, and the O-ring helps seal the interface. Combining those parts with a printed body makes a low-volume adapter practical without dedicated injection-mold tooling. The bracket handles the mechanical fit; wiring and ECU calibration must be checked separately for the vehicle.
This is a Falk MFG product offered for compatible M20 and M30 applications. See the M50 TPS adapter, or discuss a similar design problem.