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Water-Methanol Injection System, 720
Purchase Water-Methanol Injection System, 720
  • SKU: 01-840-01964-3

    Water-Methanol Injection System, 720

  • $2,399.00 $2,399.00

  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Manufacturer Weistec
Street legal in all the US States No
Engine Family M840T
UPC 810089560124
year make model trim engine
2020 McLaren 720S Spider Twin Turbo 4L V8 (M840T)
2020 McLaren 720S Base Twin Turbo 4L V8 (M840T)
2019 McLaren 720S Spider Twin Turbo 4L V8 (M840T)
2019 McLaren 720S Base Twin Turbo 4L V8 (M840T)
2018 McLaren 720S Base Twin Turbo 4L V8 (M840T)

Product Description

The Water/Methanol injection has been in use for several decades in multiple applications.  Originally, it was used to reduce knock while increasing power and performance in aircraft engines.  Eventually, it came to be used in the motorsports industry where it was found to have substantial benefits on turbocharged engines.  The Weistec Water/Methanol injection System features a Water/Methanol Controller with built-in MAP sensor.  This controller is a progressive controller that slowly increases injection as boost builds, resulting in a smooth and seamless operation.  The included Turbo Charge Pipes each have a built-in bung, allowing the use of two injectors for uniform injection and cooling.  The combination of the cooling effects of methanol and the knock resistance of water results in significant gains in horsepower* and torque* as well as a reduced chance of heat soaking the intercooler system.

This system is a complete, bolt-on system that can be installed without any guesswork or custom fabrication.  Weistec has engineered and manufactured many of the components of this system to ensure a simple and straightforward installation. The gains in performance and consistency make this system an essential upgrade for the McLaren Twin Turbo V8 engine.


Key Features:

  • Reduced Intake Air Temperatures

  • Increased Knock/Detonation Resistance

  • Up to 80 HP Gain*

  • Weistec Vacuum/Boost Adapter

  • Water/Methanol Controller with built in MAP sensor

  • Dual Weistec CNC Machined Injector Bodies with built in check valves

  • Small, Medium and Large Quantity Injection Nozzles Included for a wide range of configuration

  • Trunk Mounted 2.25 Gallon Tank with racing cell cap and integrated pump mount

  • High Quality Quick Disconnect Fittings

  • Designed for 50/50 Water and Methanol Mixture

  • Compatible with Stock, and W.3 Turbochargers

  • All hardware and gaskets are included

*Power gains dependent on fueling, conditions, and vehicle upgrades