Mechanical Water Injection


This is the same kit used on our own 550+RWHP street Rx7 running 25psi on pump fuel!

*Upgraded kit
Tank Size

How it works

This pre-turbo water injection kit is mechanically driven by your vehicle's forced induction system. It has no pump to fail and uses very few components. The key is in the special atomizing nozzle that generates a fog of water injected into the turbo inlet. It helps extend the compressor map efficiency without adding lag. Inside the combustion chamber, the water dramatically reduces knock. It raises the effective octane level above and beyond that of race fuel. Much higher boost levels, leaner mixtures, and advanced timing can safely be run which means more power without sacrificing reliability. See our FAQ for answers to common questions regarding our mechanical water injection systems. Installation Guide found here.


  • Modified air atomizing nozzle (flow data in product details)
  • 4 Quart Tank 11.756”H x 8.632”W x 4.173”D *(Other sizes available on request)
  • Quick connect fittings, lines, adapter fitting, and flow control valve
  • Adjustable Boost switch
  • Solid Brass Solenoid
  • Wiring & filter
  • 24' Tubing (Standard color is blue other colors available in the upgraded kit)

Upgraded Kit (+$35)

  • Replaces the black/blue composite push to connect fittings with nickel plated push to connects, and your choice of hose color. (Colors available: Black, Blue, Gray, Green, Orange, Red, Clear and Yellow)

Tank Sizes available

  • 1 Gallon (standard kit)
  • 2.5 Gallon (+$25)
  • Other sizes available on request

We try to keep 2 kits in stock at all times, due to the nature of the kit we may need an additional week or 2 to assemble your kit. If this is a concern please contact us before ordering to verify stock. 


Data sheet

Max - 450cc/min @ 15 psi
Max - 600cc/min @ 20 psi
Max - 750cc/min @ 25 psi
Max - 900cc/min @ 30 psi
Max - 1050cc/min @ 35 psi
Tank Dimensions
11.756”H x 8.632”W x 4.173”D
Activation Point
12 PSI (adjustable 3-20psi)
Flow Level Adjustable
Methanol Safe
Yes 50/50 mix