REAPER·CONTROLS
Prototype Hardware

Golem

Power without a leash. 40A high-side power switching, built for pumps and fans that deserve better than a raw ECU output.

In Jewish folklore, a golem is a being formed from raw material and given a purpose — an obedient servant built to carry out exactly what it's directed to do, not the mindless brute later pop culture turned it into. That's the job here: take whatever low-frequency command your ECU is comfortable sending, and carry it out properly — as clean, high-frequency power delivery, at up to 40A.

Most aftermarket ECUs cap their PWM output well below what a pump or fan motor actually wants to see, and cheap automotive relays can't switch fast enough to fix that on their own. The result is a low-frequency square wave doing a job it was never suited for — hard on windings, audible, and inefficient.

Golem sits between your ECU and the load. It takes the same simple duty-cycle signal your ECU already outputs and regenerates it as clean, high-frequency power at up to 40A — standalone, no ecosystem required. Built with Holley Terminator/Dominator and Haltech users in mind, but useful anywhere an ECU needs to drive a serious load properly.

We wrote up the underlying problem in detail: What Frequency Should You Run for Holley PWM Fuel Pump Control?

First prototype boards are in transit now, headed to the bench for validation as soon as they land.

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