Products/Fan Control/Tengu
CONCEPT ART · DESIGN NOT FINAL
REAPER CONTROLS
Tengu Closed-Loop Smart Fan Controller
Electric Fan Controller, Closed-Loop Coolant Temperature Control, Dual Outputs, A/C Input, Holley Sensor Compatible, Bluetooth Setup, Sealed
In Development
Not yet for sale. Design in progress.
- Control method
- Closed-loop on coolant temperature
- Fan outputs
- 2
- Drives
- Golem, or PWM brushless fans directly
- Temp sensor
- Holley-compatible 3/8" NPT, one sensor
- A/C input
- Yes
- Setup
- Veil app over Bluetooth (iOS and Android)
Planned specifications
| Brand | Reaper Controls |
|---|---|
| Product line | Tengu |
| Part type | Electric fan controller |
| Control | |
| Control method | Closed-loop on measured coolant temperature |
| A/C request | Dedicated A/C-on input |
| After-shutdown run-on | Preset to a calculated value, adjustable in the app |
| Outputs | |
| Fan outputs | 2 |
| Output type | PWM |
| Compatible drivers | Golem (40A per output), or PWM brushless fans directly |
| Sensor | |
| Coolant temp sensor | Holley-compatible 3/8" NPT thermistor |
| Sensors required | One |
| Holley EFI installs | Designed to share an existing Holley sensor |
| Setup & app | |
| Configuration | Veil app, Bluetooth (iOS and Android) |
| Settings storage | On the module; no phone needed to run |
| Electrical & physical | |
| System voltage | 12V automotive |
| Standby | Low-power sleep when the vehicle is off |
| Enclosure | Environmentally sealed |
| Designed in | Missouri, USA |
Features
- Closed-loop, not on/offTengu reads coolant temperature and adjusts fan speed to hold it, instead of slamming the fans on at one temperature and off at another.
- Two outputsRun dual fans on separate outputs, with room for setups that need more than one Golem.
- Uses the sensor you already haveBuilt around the same coolant temp sensor Holley uses. On a Holley EFI car it's designed to share the existing sensor; everyone else gets one in the box.
- A/C awareA dedicated input brings the fans up when the A/C is on.
- Run-on after shutdownKeeps the fans going after you shut off to deal with heat soak. Ships at a sensible preset, adjustable in the app.
- Built to survive the summerSealed against the heat cycles, vibration and moisture that kill cheaper controllers a couple of seasons in.
About Tengu
The aftermarket fan controller market isn't short on options. It's short on ones that hold up. Cheap sensors drift, connectors corrode, and a controller that worked fine on the bench fails quietly two seasons later under a hood full of heat cycles and vibration.
Tengu is being built around sealing and long-term reliability first, with closed-loop control and app setup on top of that foundation rather than instead of it. The goal is a fan controller you install once and stop thinking about.
In Japanese folklore, the tengu are mountain spirits, often shown with a bird's beak or a long red nose and carrying a feather fan that can raise a gale. The early stories made them dangerous demons who led monks astray. Over the centuries they became guardians of the mountains, and in legend it was a tengu who taught the young Minamoto no Yoshitsune the sword. The fan is the point: a tengu commands the wind. So does this one.
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