AEM Water Methanol Kit V3


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SKU: 30-3300 Category: Tag:


AEM Water/Methanol Injection Kit 30-3300 V3

  • Boost Dependent and Multi-Input (0-5v/frequency) progressive controller designs feature large adjustment knobs, integrated plug for harness connection, integrated fuse, covered status light, and test button for enhanced splash resistance and mounting tabs
  • The wiring harness is terminated with a positive-lock connector on one end with color-coded wires to ease installation, integrated pump ground circuit, and additional wire for optional on/off fluid solenoid
  • “Boost Safe” failsafe output included (for complete failsafe under all conditions, see our Water/Methanol Failsafe Device)
  • Heavy-duty high-pressure injection pump features integral fittings, a Santoprene diaphragm, and EPDM seals to resist corrosion. Our pump maximizes line pressure for optimum atomization, and its quiet, smooth operation is almost undetectable
  • Precision-machined billet-aluminum injector with integral check valve
  • Three interchangeable injector nozzles to cover a wide variety of HP levels (250cc/min, 500 cc/min & 1,000cc/min)
  • 1.15-gallon tank with anti-starvation reservoir, integral conductive low-fluid sensor, and positive lock connector (tank-less systems available)
  • 20 feet of injection tubing included
  • LED dash light for system status and low fluid warning

aem water/methanol injection system v3

AEM Water Methanol Kit for Forced Induction Gasoline Engines

Water/methanol injection for forced induction (turbocharged or supercharged) gas-powered race engines is a proven means for effectively reducing engine inlet air temperatures and suppressing harmful detonation. This allows racers to increase boost and advance ignition timing reliably. Without using high-octane racing fuel—for power gains of up to 20%. The AEM Water Methanol Kit uses robust hardware with more advanced features than any other comparably priced water/methanol system.

Our breakthrough injector design uses unique Swirl Generator Technology. This improves atomization to deliver faster inlet temp cooling and uses less fluid to maintain inlet air cooling. We include three Swirl Generators that deliver 250cc, 500cc, and 1000cc of flow. In testing at AEM, the new V3 250cc WMI nozzle and the V2 250cc WMI nozzle both achieved a 90-degree inlet temp reduction; however, the V3 nozzle design achieved this reduction nearly 6.5 seconds faster. Consider that this can represent close to 40% of track time on an average sportsman drag car. On a road race car, applying more timing 6.5 seconds faster can mean a critical time to pass on a corner exit.

We then tested a V3 250cc injector against a V2 500cc injector to see if the larger V2 injector would improve cooling speed. Testing V2 500cc injectors achieved a nearly identical cooling speed as the V3 250cc injector, but it required almost 44% more fluid to achieve the same cooling. Less fluid used means fewer refills of your WMI tank and less money spent refilling it. Using the V2 500cc nozzle with a one-gallon tank, you will get close to 7 minutes and 50 seconds of run time at full pressure. Using the V3 250cc nozzle with a one-gallon tank, you will get 13 minutes and 30 seconds of run time at full pressure.

This kit is boost dependent for forced induction vehicles up to 35 PSI of boost. The Boost Dependent controller has an onboard manifold absolute pressure (MAP) sensor with a molded-in nipple for a boost hose pickup.

AEM Water Methanol Injection Kit dyno comparison


Reduces Air Inlet Charge Temps
“Liquid Intercooling” refers to a highly atomized mist of water/methanol that is injected into the airstream and begins to evaporate. This evaporative effect reduces air charge temps by as much as 100 degrees. It delivers a more oxygen-rich air charge.

Reduces Detonation (Knock)
Water absorbs heat, and methanol is a cool burning, anti-knock-rated fuel. When combined and introduced into the inlet stream, they can increase your vehicle’s anti-knock index. Boost pressure and advance ignition timing can then be increased using pump gas.

Reduces Carbon Deposits
Modern vehicles fitted with Exhaust Gas Recirculation (EGR) devices for emissions control promote heavy carbon build-up inside the air intake. This carbon build-up can create ‘hot spots’ in the combustion chambers that can cause detonation. Water/methanol injection has a ‘steam cleaning’ effect that reduces this carbon build-up, and in some cases, can increase fuel economy.


AEM Kit Settings

The AEM Water/Methanol Injection Controller is a progressive type controller. This means fluid is injected in proportion to the amount of boost that is detected by the internal MAP sensor. That means more boost equals more fluid. That means it is essential that the vacuum/pressure connection be made properly and securely, or vehicle/engine damage could occur. The controller will automatically compensate for any fluctuations in battery voltage variations to ensure consistent flow under all conditions.

The two knobs on the controller’s face dictate at what manifold (boost) pressure minimum fluid injection starts and at what pressure maximum/full fluid injection occurs. The fluid injection will ‘progressively’ increase between these two points as set by the adjustment knobs.

The “Start PSI” dial has a range from 1 PSIG (full counterclockwise rotation) to 11 PSIG (full clockwise rotation). The “Full PSI” dial has a range of 5 PSIG (full counterclockwise rotation) to 35 PSIG (full clockwise rotation). It is suggested to adjust the “Start PSI” value by setting the dial to approximately 25% of the vehicle’s maximum boost. Adjust the full-in value to your maximum possible boost. These are only suggestions; improper use or setting could result in engine or vehicle damage – please consult your tuner.


Water/methanol injection is generally not considered a bolt-on power adder for forced induction gasoline applications. Engine tuning is usually required to maximize potential power gain. Water/methanol injection allows for a more aggressive tune to be used while still using pump gas as your base fuel.

A 50/50 mix of water/methanol is recommended for the best combination of air charge cooling and detonation control. With conservative boost and timing, establish a base AFR that is one point higher than your final target AFR. For example, if your final target AFR with water/methanol injection is 11.0:1, set your base AFR to 12.0:1.

Once the base AFR has been set, start injecting water/methanol. Adjust the injection flow rate to achieve your final target AFR. For example, if your base AFR is 12.0:1 and then during injection, your AFR drops to 10.5:1, reduce the water/methanol flow rate until your final target AFR is reached. It’s recommended that the injection system’s flow rate be changed to reach your target AFR and NOT your primary fueling. Injection flow rate adjustments are made by changing your nozzle selection or adjusting the “Start PSI” and “Full PSI” settings.

Once the injection flow rate is set to deliver your desired final AFR, boost and ignition timing can be increased to take advantage of the additional air charge cooling and detonation control. When injecting the correct amount, a 50/50 mix of water/methanol has been shown to provide an effective octane of over 110 when using a base fuel of 91–93 octane pump gas. A properly tuned water/methanol injection system will usually support a typical “race gas” engine tune. COLD WEATHER