Injector Dynamics ID1700x Fuel Injectors for RX-7 & Comso

£599.00 (inc VAT)

Available in 11mm and 14mm top feed sizes to fit your specific application


Earn up to 599 ER Points.


Essex Rotary can now offer a lineup of the popular Injector Dynamics fuel Injectors, these injectors are a true motorsport grade fuel injector not a production road car injector that has been modified to flow more fuel. Injector Dynamics Fuel Injectors are unique to Injector Dynamics and Manufactured to ID’s specifications for Injector Dynamics by Bosch Motorsport.

Essex Rotary offer the ID1700x Injectors in either 11mm top seals or 14mm top seals to suit your specific application, Please note that a general rule is that if your using a stock Mazda rail or some aftermarket japanese rails you will require the 11mm top seals however most aftermarket fuel rails will use the more common US spec 14mm top seals.
you will find more information on sizes in the “additional information tab” however here are some common guides.

  • KG Parts Rails will require 14mm versions no matter what model engine your looking to fit them to.
  • RX-7 FC3s  Stock Fuel Rails will use 11mm top seals in the rail however it is worth noting that this may limit your fuel flow capabilities.
  • RX-7 FD3s uses side feed injectors as standard so you will require the use of aftermarket fuel rails in order to use these injectors in your third gen. We would recommend the KG Parts Rails for this application.

These injectors cannot be found from another manufacturer. With injectors ranging from their new ID1050x (1065cc/min at 3bar) all the way up to their ID2000 (2000cc/min Injectors) your sure to find your fuel system needs are covered by an Injector Dynamics product.

These 1700x Injectors should provide your  Rotary engine with all the fuel in needs for extreme high horse power FI applications, The ID1700x injectors could be considered the modern day replacement for the old school big daddy of fuel injectors from back in the day the Bosch 1680’s that have long been out of production.

These ID1700x Injectors are for use in the secondary fuel rail only. 

The ID1700x is the most recent offering from the partnership of Injector Dynamics and Bosch Motorsport. The ID1700x was designed to fill the gap between the ID1300x and the ID2000, and like the ID1300x, it features corrosion resistant internals making it compatible with all known automotive fuels.
A unique magnetic circuit, resulting from a lengthy development program, makes the ID1700x immune to voltage and pressure sensitivity problems that plague other high impedance high flow injectors. The ID1700x excels at high pressures typical of current automotive systems, and will perform flawlessly in these applications.
  • Corrosion resistant internals make it compatible with all known fuels, capable of extended service life with corrosive fuels.
  • Compact body allows fitment in 200+ applications, including current and future engines utilising short body injectors.
  • Improved internal flow path increases output by 5% without sacrificing low flow performance.
  • Stronger magnetic circuit offers stable operation up to 10 bar.
  • Replaceable inlet filter extends service life.

Application Notes

The ID1700x was designed to be an all fuel compatible injector, capable of very high flow rates. As such, it will most often be used to deliver E85 to boosted engines, or occasionally, gasoline in extreme high horsepower applications. Neither of these applications requires extended linearity at low flow rates, and so this was given a proportionately lower priority during the design process.

The ID1700x will deliver flawless stoichiometric idle and cruise mixtures on E85, but like the ID2000, should not be expected to do so on gasoline.

If you need flawless drivability on gasoline, the ID1300x will provide this, and is capable of approximately 150hp per injector on E85.

ID1700x Basic Specifications

Nominal Flow Rate – 1725cc/min @ 3.0 Bar (43.5 psi) Using Iso-Octane at 52 Degrees C (125 Degrees F)
Maximum Differential Fuel Pressure – 7.0 Bar (101.5 psi)
Fuel Compatibility – Compatible with Methanol/Ethanol/All Known Hydrocarbon Fuels.
Electrical Connector – USCAR

Each set of injectors are specifically selected and set up for the selected vehicles application.

This Kit Contains :
2 x ID1700x Fuel Injectors (with either 11mm or 14mm top hat adaptors to fit your selected application)

Please Note

If you are purchasing these for a 20b engine you will require 3 injectors per rail, please contact us for pricing and special ordering.


Additional information

Flow Rate

1725cc/min @ 3.0 Bar (43.5 psi) Using Gasoline at 52 Degrees C

Connector Type


Maximum Differential Fuel Pressure

7.0 Bar (101.5 psi)


Application will depend on your specific Fuel Rail this is just a guide
1984-1985 Mazda RX-7 FB GSL-SE US Model EFI 13b (11mm Stock Rail)
1986-1988 Mazda RX-7 FC3s EGI Series 4 (stock Rail 11mm)
1986-1988 Mazda RX-7 FC3s Turbo II Series 4 (stock Rail 11mm)
1989-1991 Mazda RX-7 FC3s EGI Series 5 (stock Rail 11mm)
1989-1991 Mazda RX-7 FC3s Turbo II Series 5 (stock Rail 11mm)
1989-1991 Mazda RX-7 FC3s Turbo II Series 5 (KGParts Rail 14mm)
1992-2002 Mazda RX-7 FD3s Will Require Aftermarket Rails (KGParts Rail 14mm)
1990-1993 Mazda Cosmo JC3SE Series 1 13b-RE (stock Rail 11mm)
1990-1993 Mazda Cosmo JC3SE Series 1 13b-RE (KGParts Rail 14mm)
1994-1995 Mazda Cosmo JC3S Series 2 13b-RE (stock Rail 11mm)
1994-1995 Mazda Cosmo JC3S Series 2 13b-RE (KGParts Rail 14mm)
1990-1993 Mazda Cosmo JC3ESE Series 1 20b-REW (stock Rail 11mm)
1990-1993 Mazda Cosmo JC3ESE Series 1 20b-REW (KGParts Rail 14mm)
1994-1995 Mazda Cosmo JC3ES Series 2 20b-REW (stock Rail 11mm)
1994-1995 Mazda Cosmo JC3ES Series 2 20b-REW (KGParts Rail 14mm)


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