Power Distribution Units

A motorsport PDM (Power Distribution Module), PMU (Power Management Unit), or PDU (Power Distribution Unit) replaces the fuse box, relay bank, and rotary switches in a race car with a single programmable solid-state unit. Every circuit is software-controlled — set current limits, activation conditions, PWM duty cycles, and fault responses in dedicated software or via CAN from the ECU. The result eliminates mechanical fuses and relays entirely, saving weight and removing the most common point of electrical failure in a race car.

XTRA Motorsport offers motorsport power distribution units from ECUmaster, AiM, Link ECU, Bosch Motorsport, and MoTeC — covering club racing single-seaters through factory GT3 and FIA endurance programmes.

What a Motorsport PDM Replaces

Searching for “motorsport fuse box replacement” or “solid state relay race car”? A PDM is exactly that — one programmable unit replaces all of these:

Traditional Component PDM / PMU Equivalent
Blade fuse box Programmable current-limited solid-state outputs, per-output overcurrent protection
Automotive relays Solid-state switching — no moving parts, no relay chatter, faster response
Rotary / toggle switches Software-mapped inputs and CAN bus commands
Separate data logger Internal logging on PMU-16DL, PMU-24DL, AiM PDM32
External inertia cut-off switch Built-in 3D accelerometer in ECUmaster PMU series

Cross-Brand Specification Comparison

XTRA Motorsport offers all four major brands. No other European supplier publishes a direct cross-brand comparison:

Unit Outputs Total Current Internal Logger IP Rating Connector Software
ECUmaster PMU-16 16 150A No IP60 39-pin automotive PMU Manager
ECUmaster PMU-16DL 16 150A 256 MB IP60 39-pin automotive PMU Manager
ECUmaster PMU-16AS 22 (16 HS + 6 LS) 150A 256 MB IP65 Deutsch Autosport + Radlok PMU Manager
ECUmaster PMU-24DL 24 170A 256 MB IP60 39-pin automotive PMU Manager
AiM PDM08 8 100A Yes (4 GB) IP65 AiM proprietary Race Studio 3
AiM PDM32 32 120A Yes Standard AiM proprietary Race Studio 3
Bosch Motorsport PBX90 36 90A Via CAN Standard Bosch proprietary Bosch PBX Suite
Bosch Motorsport PBX190 52 190A Via CAN Standard Bosch proprietary Bosch PBX Suite
Link ECU Razor PDM 18 100A No IP67 Deutsch DT Link ECU PC Link
MoTeC PDM15 15 (8×20A + 7×8A) — Via CAN Standard MoTeC proprietary (26+34 way) MoTeC PDM Manager
MoTeC PDM30 30 (8×20A + 22×8A) — Via CAN Standard MoTeC proprietary (26+34 way) MoTeC PDM Manager

ECUmaster PMU Series

ECUmaster’s Power Management Units run PMU Manager software over open CAN2.0B — compatible with any ECU brand. All four models share the same 100-function CAN logic engine, per-output current monitoring at 500 Hz, and PWM capability on high-current outputs.

  • ECUmaster PMU-16 — 16 outputs, 150A total, built-in inertia cut-off. The standard circuit and rally PMU.
  • ECUmaster PMU-16DL — PMU-16 with 256 MB internal datalogger; all output states and currents logged at up to 500 Hz.
  • ECUmaster PMU-16AS — IP65, Deutsch Autosport connectors, Radlok 200A battery disconnect, 2×40A outputs, 256 MB logging. For FIA technical regulation compliance, off-road, and professional teams.
  • ECUmaster PMU-24DL — 24 outputs, 170A total, 256 MB logging. For complex GT and endurance builds requiring more than 16 switched circuits.

AiM PDM Series

AiM PDMs integrate natively with AiM Race Studio 3 and stream power distribution data to AiM dashboards and loggers via CAN. Ideal for builds already running AiM data systems.

  • AiM PDM08 — 8 outputs, compact. For club racing, single-seaters, and simpler circuit builds.
  • AiM PDM32 — 32 outputs with internal datalogger. Full electrical management for complex race cars with AiM data integration.

Bosch Motorsport PowerBox

The Bosch Motorsport PowerBox (PBX) series is the OEM-grade PDU used in factory FIA GT3 and endurance programmes. Configured via Bosch PBX Suite and designed for direct integration with Bosch Motorsport MS ECUs and DDU dashboards.

MoTeC PDM Series

MoTeC PDM15 and PDM30 are configured via MoTeC PDM Manager and integrate natively with MoTeC M1 ECUs and C-series dashboards. Compact, high-reliability units used in professional GT and formula programmes.

  • MoTeC PDM15 — 15 outputs (8×20A + 7×8A), 16 switch inputs, CAN. The compact MoTeC PDM for simpler installs.
  • MoTeC PDM30 — 30 outputs (8×20A + 22×8A), 16 switch inputs, CAN. Same footprint as the PDM15 with double the channel count for complex multi-circuit cars.
  • MoTeC PDM Connector Kit — mating connector set for MoTeC PDM15 and PDM30.

Link ECU Razor PDM

The Link ECU Razor PDM integrates directly with Link ECU G4X and G5 engine management. One software environment — Link ECU PC Link — controls both engine and power distribution. 18 outputs, 100A continuous, IP67.

Choosing a PDM by Discipline

Discipline / Build Recommended Unit
Club racing, single-seater, track day ECUmaster PMU-16 or AiM PDM08
Circuit GT, time attack, hillclimb ECUmaster PMU-16 or PMU-16DL
Complex GT / multi-circuit endurance ECUmaster PMU-24DL or AiM PDM32
Rally, off-road, Dakar, cross-country ECUmaster PMU-16AS (IP65)
Full AiM data ecosystem AiM PDM08 or PDM32
Link ECU G4X / G5 builds Link ECU Razor PDM
Factory FIA/ACO homologation Bosch Motorsport PBX90 or PBX190
MoTeC M1 / C-series builds MoTeC PDM15 or PDM30

FAQ

What is the difference between a PDM, PMU, and PDU?

All three acronyms describe the same category of device — a programmable solid-state power distribution unit that replaces fuses and relays. ECUmaster uses PMU (Power Management Unit), AiM and Link ECU use PDM (Power Distribution Module), Bosch uses PowerBox, and some engineers use PDU (Power Distribution Unit). The hardware function is identical across all naming conventions.

Do I need to completely rewire my car to fit a PDM?

No. A PDM can be installed circuit by circuit — start by replacing the fuse box and relay panel, then add switched outputs progressively. You do not need to rebuild the entire loom to benefit from a PDM. Full rewires are common in new builds and professional team builds, but a partial installation replacing only fuses and mechanical relays is equally valid and still eliminates the most failure-prone components.

How many outputs do I need?

Count every switched circuit: fuel pump, ignition coils, cooling fans, water pump, ECU, dash, logger, headlights, starter, solenoids, wiper. Add 20% headroom. Most circuit cars run 12–16 active circuits — the PMU-16 or PDM08/PDM32 cover most builds. Complex GT and endurance cars with dual fuel systems, full lighting, and multiple solenoids typically need 20–28 outputs — PMU-24DL or AiM PDM32.

Can a PDM operate without a CAN-connected ECU?

Yes. All units in this range operate fully standalone with their own configuration software. CAN bus integration with an ECU is optional but adds significant capability — fan speed from ECU coolant temperature, fuel pump cut on engine stall, gear-cut outputs from a paddle shift controller. If you have a CAN-capable ECU, integrate it. If not, the PDM still replaces your fuse box and relays.

What is the difference between ECUmaster PMU and AiM PDM?

Both are capable motorsport power distribution units. The ECUmaster PMU range offers a broader output count family (16 to 24 outputs), a 100-function onboard logic engine that runs conditional switching without ECU involvement, and open CAN compatibility with any ECU brand. AiM PDMs integrate natively with AiM Race Studio 3 and stream data directly into AiM dashboards and loggers — ideal if the car already runs AiM data systems. Choose ECUmaster for ECU-agnostic installations or complex logic; choose AiM for tighter AiM ecosystem integration.

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