REAPER·CONTROLS
In Production

Wraith

Closed-loop fuel pump control. Real pressure feedback instead of a guess.

A wraith is a spectral figure said to appear at the edge of perception — watching, present, but never quite seen directly. It's the right name for a controller that's constantly reading fuel pressure in the background and adjusting in real time, without the driver ever having to think about it.

Most PWM fuel pump control in the aftermarket is really just a binary switch dressed up as something smarter — a fixed duty cycle, or a duty cycle tied to a single RPM threshold. It's not actually watching pressure. It's watching RPM and guessing.

Wraith is built around a real closed loop: pressure is measured continuously and the pump's duty cycle is adjusted to hold the target, whether that target is a steady 6–7 PSI for a carburetor or something closer to EFI pressures. RPM still plays a role as feedforward, but pressure is what actually drives the correction — the difference between a controller that reacts to load and one that just guesses at it.

Wraith owns pressure logic; the underlying power switching is handled by Golem so each piece of the system does the job it's actually good at.

We wrote up why watching RPM isn't the same as watching pressure: RPM-Threshold vs. Pressure-Based Fuel Pump Control

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