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Snow Performance Water-Methanol Injection Controllers Explained
How to choose the right Snow Performance water-methanol injection controller to suit your needs.

Featured Article

How to Choose the Right
Water-Methanol Injection Controller

This week we are going to talk about choosing the right Snow Performance water-methanol injection controller to suit your needs. The Digital Variable controller is the brain of your water methanol system, it tells you system when to inject and how much. Choosing the right controller is key to getting the most out of your Snow Performance water-methanol injection system, and we are going to walk you through picking the right one!

Snow Performance has researched and developed and array of controllers to suit various engines and applications, ensuring that no matter what setup you are running we have a system that injects the proper amount at the right time for your set-up. Our systems are arranged in stages ( 1-3), and get more sophisticated in injection strategy as the stage goes up. Below we will discuss our various controllers and what applications they are suited for to help you decide what controller will work best with your vehicle!

Stage 1

Our entry level system is a Stage 1 and uses the most basic control setup for boost. The Stage 1 Snow Performance system will inject based on a boost switch that can be set to trigger at any pressure from 1 – 20 psi. This is not a variable injection system in that the pump is either off or fully on. This is a very simple and economic system. Applications suited for this system are boosted applications under 9psig and drag cars which will be at 100% throttle most of the time they are operating so variable injection is not important.

VC-20 Water Methanol Injection Controller

Stage 2 “Original” Part # 20010

Our “original” Stage 2 systems offer a good blend of economy and technology. It uses a VC-20 controller and modulates injection based upon the boost level the engine is producing. It looks like a small black “MSD” box and is typically engine bay mounted. It has an injection “start” and “full” set point to form an injection curve. At the start injection point( lower boost), the controller will command the pump to inject a little bit and will ramp up injection as boost approaches the “full” injection setting. We recommend this system for all centrifugal superchargers and larger (slower spooling) turbo applications.

VC 50 Water Methanol Controller Snow Peformance

Stage 2 “New” Part # 210

This system is “gauge style” and also uses boost to modulate injection. It doubles as a boost gauge as it displays boost in large digits as well as injection commanded on the OLED screen. Added features included a low fluid level indicator and system monitoring with system faults indicated. Many like the fact that it’s interior mounted so system set-up can be done on the fly. There are adjustments for “start” and “full” injection. This controller also has the ability to control a second “power” nozzle independently for additional injection at higher boost levels. This primary and power nozzle combination allows a wider range on injection in that the system can have a smaller nozzle to inject earlier in the boost range without quench but still maintain a larger nozzle for flow in the upper range. On screen colors can also be changed to suit the users taste. Overall this controller operates in a very simple user friendly way with just enough features to make it an economic upgrade to our standard boost referenced controller. We recommend this controller for all boosted vehicles although for positive displacement superchargers or small, fast spooling turbos, part # 212 or Stage-3 is probably a better choice.


Stage-2 MAF Part# 212

To address the needs of vehicles with screw and roots style superchargers as well as small fast spooling turbo charges we developed the MAFU controller. This controller uses the signal from the vehicles stock MAF sensor (or MAP sensor in Chrysler) to modulate injection. By using airflow rather than boost pressure the unit is not fooled by the sharp boost spikes and can produce a smooth injection curve as airflow increases. The unit can read signals from any 0-5 volt MAF or MAP as well as any frequency based MAF for a wide range of applications. It is similar in appearance to the VC-20 black box controller and uses the same mechanical dials to set “start” and “full” points.

Because the controller does not require boost pressure it is also compatible with normally aspirated vehicles with fuel injection. This application has been gaining popularity with normally aspirated applications for a cleaner cooler running engine and in certain areas to offset sub-par pump gas.

Stage-2 Muscle Car Part#220

In much the same way we addressed the demand of certain applications with the MAFU controller, we developed the Stage-2 Muscle Car system for carb’ed normally aspirated vehicles with too much compression to just run pump gas. The MCVC controller uses manifold vacuum to control injection. This controller is a black box style with two mechanical dials for setting “start” and “full” points with injection increasing as the throttle plate opens reducing vacuum.

This controller also features an adjustable RPM lock-out so that there is no injection in the lower RPM levels. This controller is suitable for all carbureted normally aspirated applications and is especially useful for 10:1+ compression engines where more octane is needed. Using 50% methanol on top of 91 octane pump gas will give the same effective octane as 118 octane race gas.

Stage 3

Snow Performance Stage 3 controllers are the pinnacle of accurate injection technology. For a more correct injection curve, they use dual data sensing to more accurately inject in line with your engine’s demands. They are designed for EZ set-up so you don’t need a lap-top or a PHD to use them. Our Stage 3 gas controllers use both boost pressure and injector pulse width or fuel rail pressure to modulate injection based on a 2D map.


Stage 3 EFI/DI Part# 310/320

Our stage 3 controllers are compatible with both port fuel injected engines and direct injected engines. The controllers operate in the same manner but sense fueling data in different ways. Along with boost, The EFI version uses a fuel injector pulse width reading to correspond with horsepower output. The direct injected controller uses the fuel rail pressure sensor for its power output reference. Stage 3 controllers can be weighted between the boost information and the fuel information they reference. This means that if the user wishes to inject based more upon fuel system demand or boost pressure, they can tell the controller to weight its injection map one way or the other. This ability to adjust the injection based up two reference points means the controller can be used with all forced induction Fuel Injected applications regardless of the shape of the boost curve. Use part # 310 if your application is manifold injected ( EFI). If your application is Direct Injected (DI), use part # 320. This is the most adjustable and advanced controller and is suited to newer finely tuned engines and for applications where numerous engine modifications will need to be accounted for. The Stage 3 controller can be used in every application except a carbureted engine.

Stage 3 controllers come with the ability to control a second nozzle independently for the widest range of injection - just like the VC-50 controller used the “New” stage-2. This operates in much the same way but can be activated by either boost or fuel reference.

These are the water-methanol controllers we offer at Snow Performance and this comprehensive list for gasoline applications should aid in selecting the right controller for your needs. As you can see our stages of controllers are not determined by power level but rather how the controller collects and registers data to control injection. The factors to consider when selecting a controller should first be to determine the fuel and boost system your engine is using or will use, and then decide your goals for the system and the level of technology you want to use. Our staff is always happy to help with suggestions so you get the correct system for your application!