This unit feature digital precision and settings display vs. the analog "two-knob" AEM WMI controller alternative. That's while the latter offers a few more minor functions. Either is a fine choice for a basic water/meth system.
The VC-30 progressive controller with included digital display and manifold absolute pressure (MAP) sensor proportionally injects more or less water/methanol according to boost pressure. Start and full points are adjustable for engagement and delivery curve to match what the engine requires. Proportionally injecting water/methanol according to boost pressure gives an accurate delivery allowing cooling and performance improvements over a wide range for improved drivability and cooling benefits.