AEM V3 Multi-Input Water/Methanol Injection Kit

AEM V3 Water/Methanol Injection Kit

You're running high boost on pump gas and you're hitting knock limits before you can turn the boost up where you want it? AEM's V3 water/methanol injection kit sprays a water/meth mixture into your intake to cool your intake charge and suppress detonation. When you're running serious boost, your intake air temps climb and you start knocking. Water/meth cools that charge down and raises your effective octane so you can run more boost and more aggressive timing without blowing up your motor. You can pick up 20% more power on pump gas with water/meth compared to pump gas alone. AEM makes two versions of this kit - the boost-dependent controller (30-3300) for setups under 35 PSI, and the multi-input controller (30-3350) for ultra-high boost setups over 35 PSI or naturally aspirated applications.

Here's What Water/Meth Actually Does

Water/methanol injection works on two fronts - it cools your intake charge and it raises your effective octane. When you spray water/meth into your intake, the water evaporates and pulls heat out of the air. Cooler air's more dense so you're cramming more oxygen into the cylinder. More oxygen means more power. The methanol raises your effective octane which suppresses detonation. That lets you run higher boost pressure and more aggressive ignition timing without knocking your motor to death. The combination of cooler intake temps and higher effective octane lets you make way more power on 93 octane pump gas than you could without water/meth. Even if you're running E85 or race gas, water/meth still helps because it cools the intake charge even more and gives you extra headroom before you hit knock.

Two Controllers for Different Applications

Boost-Dependent Controller (Part Number 30-3300):
This version's got an on-board MAP sensor with a molded-in nipple for your boost hose. It's designed for forced induction setups running up to 35 PSI of boost. The controller reads boost pressure directly from the sensor and progressively increases water/meth flow as boost climbs. You set your start point (when injection begins) and your full activation point (when you're getting maximum flow). The on-board sensor maxes out at 35 PSI so if you're running more boost than that, you need the multi-input controller instead. For most street turbo builds running 15-30 PSI, the boost-dependent controller's the simpler option because you don't need an external MAP sensor.

Multi-Input Controller (Part Number 30-3350):
This version works with external 0-5 volt MAP sensors for ultra-high boost setups over 35 PSI. It also works with frequency-based inputs like injector duty cycle (IDC) or mass airflow (MAF) sensors, which makes it compatible with high-compression naturally aspirated builds. If you're running a high-comp all-motor car and you want water/meth for extra knock protection, you can trigger injection based on MAF or IDC instead of boost pressure. The multi-input controller's got dipswitches on the back for programming which input type you're using. If you're running over 35 PSI or you're doing a naturally aspirated application, this is the controller you need.

Boost Safe Failsafe System

Both controllers have AEM's Boost Safe failsafe output. The system monitors the injection for voltage errors like shorts, broken wires, bad connections, or low fluid. If the controller detects a problem, it triggers a ground signal. You can wire that signal to a warning light on your dash so you know the system's down. Or you can wire it to your standalone ECU to pull boost, retard timing, or switch to a safe fuel map when water/meth fails. If you're running 30 PSI on pump gas and your water/meth system quits, you're knocking immediately and you're going to damage your motor. The Boost Safe output lets you protect yourself when the system's not working.

Heavy-Duty Pump and Billet Injector

Both kits include AEM's recirculation-style water/meth pump. The pump's waterproof and it runs quiet. It's internally bypassed so it doesn't cycle on and off - it just runs continuously and recirculates fluid when it's not injecting. That keeps the system ready to spray instantly when you hit boost. The kit also includes a machined billet aluminum injector with an integral check valve. The check valve prevents water/meth from dripping into your intake when the system's off. You don't want water/meth pooling in your intake manifold when the car's sitting. The kit comes with three interchangeable nozzles - 250cc/min, 500cc/min, and 1000cc/min - to cover different horsepower levels. Start with the smaller nozzle and go bigger as you add power.

What You Get

Both Versions Include:

• AEM V3 water/methanol injection controller (boost-dependent or multi-input)
• Heavy-duty recirculation-style pump (waterproof, quiet operation)
• Machined billet aluminum injector with integral check valve
• Three interchangeable nozzles (250cc/min, 500cc/min, 1000cc/min)
• 1.15 gallon tank with anti-starvation reservoir and conductive low-fluid sensor
• Boost Safe failsafe output for error monitoring
• LED dash light for system status and low fluid warning
• 20 feet of high-pressure nylon injection tubing
• Terminated wiring harness with positive-lock connector
• Integrated pump ground circuit and wire for optional flow solenoid
• Large adjustment knobs for easy programming
• Covered status LED and test button for splash resistance
• Integrated fuse and mounting tabs

Controller Differences:

• 30-3300 (Boost-Dependent): On-board MAP sensor, molded-in boost hose nipple, for setups up to 35 PSI
• 30-3350 (Multi-Input): Works with external 0-5v MAP sensors or frequency-based MAF/IDC inputs, for setups over 35 PSI or naturally aspirated applications

When You Need This

• High-boost turbo setups where you're hitting knock limits on pump gas
• Builds where you want to run more boost and timing without race gas
• Setups over 35 PSI where you need an external MAP sensor (multi-input controller)
• High-compression naturally aspirated builds where you want extra knock protection (multi-input controller)
• Any forced induction setup where intake temps are cooking you

Note: AEM recommends using an inline filter (part number 30-3003) with all water/meth systems to keep debris out of the injector nozzle. If your pump and tank are mounted higher than the injection nozzle, AEM recommends adding a high-flow solenoid (part number 30-3326) to prevent unintended flow from gravity. Mix your water/meth at the correct ratio for your application. Common ratios are 50/50 water/methanol or 60/40 water/methanol. After you install water/meth, get your car retuned. Your AFR targets and ignition timing will be completely different with water/meth in the mix. Don't just bolt this on and start cranking boost without a retune or you're asking for problems.