BMS Water Injection Kit for S55 M3/M4 BMW (WMI)

Water/Methanol/Alcohol injection commonly referred to as WMI allows you to make tremendous amounts of power on pump gas. The effect is similar to running 100 octane race gas or E85 fuel all the time with the additional cooling benefits allowing for more power than you can make on race gas or E85 alone.

The key to a safe and effective WMI setup is tuning integration. The S55 BMS WMI kit integrates to the JB4 tuning system allowing for precise mapping based on boost, throttle position, engine speed, intake temperature, advance, gear, and other data elements available to the JB4 through its CANbus system. In addition, a pump flow signal is fed back to the JB4 allowing for a safe and smooth progressive boost mapping. If the tank runs empty or flow drops for any reason the JB4 will safely back down performance to avoid detonation. Boost is held low until WMI is properly flowing to avoid tip in knock common with non-integrated WMI setups. In addition, WMI can be activated or disabled right from the JB4 Mobile app, will automatically disengage during traction control or safety map situations, and WMI flow data can be displayed via your JB4 Mobile logging device.

The BMS WMI kit includes a high quality Aquatec WMI pump made to our specifications, high speed solenoid with leak-free compression fittings, a WMI filter, and all required wiring and mounting hardware. You can select from our lower cost 1 gallon clear tank for a custom mount, our universal 2 gallon integrated tank, or our industry leading F chassis stealth tank for a fully hidden/clean install.

Water Injection Nozzle guide

S55 with factory turbo(s): Dual BM5
S55 with larger hybrid turbo(s): Dual BM7 

What's inside our water injection nozzles?

1 gal. UNIVERSAL TANK

1 gallon universal tank: The least expensive option this tank is compact and flexible allowing for a wide range of mounting on any flat vertical surface in the trunk. The tank is clear to allow visually checking the fluid level.

Comes with a standard 2 way vented black plastic cap.
Upgraded billet lid with 1-way check valve available below.

Tank dimensions: L 11" x W 9" x H 4.5"

Applications
Universal trunk mount

BMS 3 gal. STEALTH TANK

BMS stealth tank
With our 3 gallon stealth tank the WMI pump mounts directly to the tank and the entire assembly fits cleanly within the existing trunk cavity in your F3X or F8X vehicle below the trunk floor. Works with all DDP 5800 pumps. Made in the USA.

Comes with a standard 2 way vented black plastic cap.
Upgraded billet lid with 1-way check valve available below.

Tank dimensions: L 26.75" x W 9.75" X H 7.5"

Applications
• 2015-2019 F80 BMW M3
• 2015-2019 F82 BMW M4 (does not fit convertible)

 

 

 

2 gal. UNIVERSAL LOW PRO TANK

2 gallon universal low profile tank
With our 2 gallon universal tank the WMI pump mounts directly to the tank for the ultimate easy to install tank. This tank is compact allowing for a wide range of mounting on any horizontal surface in the trunk. Offered in black and in clear to allow visually checking the fluid level. Works with all DDP 5800 pumps. Made in USA.

Comes with a standard 2 way vented black plastic cap.
Upgraded billet lid with 1-way check valve available below.

Tank dimensions: L 15.5" x W 8" x H 8.25"

Applications
Universal trunk mount

 

 

 

CAP UPGRADE

Optional Upgraded Billet WMI tank cap w/safety check valve

This high quality custom billet WMI cap includes an integrated check valve to let air in and prevent dangerous WMI vapor/fumes from getting out! Made in USA.

Applications
• BMS 1 gallon tank
• BMS 2 gallon universal tank
• BMS 2 & 3 gallon stealth tank