How the spray logic works
The Nexus fires a pump or solenoid that mists water across the intercooler core. As the water evaporates it pulls heat out of the core, dropping charge temperatures on hot days or long pulls. The settings fall into three groups: which switches control it, which conditions must be true, and how the output is driven.
Switch settings
There are two separate switch inputs, and each can be set to one of two types.
- Arming Switch Type: the switch that makes the system available at all. Handy for turning spray off on a cold day or when the tank is empty.
- Manual Switch Type: the switch that sprays on demand, useful for a staging lane or cooling the core between runs.
For each, choose Switch for a normal toggle that stays on or off, or Latching for a momentary push button, where each press flips the state.
Conditional settings
For automatic spraying, every condition must be met at the same time. If any single one isn't, the spray stays off.
| Setting | Spray allowed when | Our advice |
|---|---|---|
| Minimum Load | Load is above this | Set it into the boost region so cruising never sprays |
| Minimum Throttle Position | TPS is above this | A high value keeps it to real pulls |
| Minimum RPM | RPM is above this | Somewhere the engine is making meaningful heat |
| Minimum Coolant Temperature | Coolant is above this | Stops spray before the engine is warm |
| Minimum Air Temperature | Intake air is above this | The most useful one: no point spraying a core that's already cool |
Output settings
With Pulsed Output off, the output simply stays on for as long as the conditions are met. Turn it on and the output cycles instead, using Pulse On Time and Pulse Off Time in milliseconds.
Pulsing is how you make a small tank last. A short burst followed by a pause lets the mist evaporate off the fins before the next hit, which cools more effectively than a continuous stream that just runs off the core. Start with short on times and longer off times, then check intake temperature in your logs and adjust from there.
Log intake air temperature before and after enabling spray on the same kind of pull. It's the only honest way to know whether your nozzles and timing are actually helping.
For the rest of the system, see our intercooler system settings and the background on how intercoolers work.
