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Injector Dynamics ID1750-XDS Injectors in the Subaru WRX Lower Configuration, Matched Set of Four
The WRX in this part number is not a marketing flourish. Injector Dynamics uses it as the configuration code for the lower interface, and the number reads as a 48 mm body with a machined 11 mm top and the Subaru-specific lower arrangement. The importer data behind this listing describes that lower as a Denso-style low cushion, which is the seat the Subaru rail expects rather than a plain O-ring.
That geometry is the whole point of the part. Four Subaru applications share it: the WRX from 2002 to 2014, the STI from 2007 to 2020, and the Legacy GT and Forester XT from 2007 to 2011. Get the lower cushion wrong and the injector either will not seat in the rail or will not seal in the head, which is why the configuration code matters more here than on the plain 14 mm sets.
Key Features
- The Subaru-specific lower configuration Injector Dynamics designates as WRX in the part number, not a generic 48 mm injector
- Listed for the WRX 02-14, STI 07-20, and Legacy GT and Forester XT 07-11
- Machined 11 mm top rather than an adapter top, paired with the low cushion the Subaru rail expects
- Matched set of four, consistent with the manufacturer's published per-set pricing for this number
- Rated at 1728 cc/min at 3.0 bar (43.5 psi) on E10 emissions certification fuel, with a published maximum differential fuel pressure of 7.0 bar
- Compatible with methanol, ethanol, MTBE, nitromethane and all known hydrocarbon fuels, with a USCAR electrical connector
- Published dynamic flow and offset data from 8 to 16 volts across the working pressure range, for direct entry into an engine management system
Fitment
| Years | Make | Model | Notes |
|---|---|---|---|
| 2002-2014 | Subaru | WRX | Published as WRX (02-14); tagged as Impreza WRX for 2002-2014 to match how the storefront records that car |
| 2007-2020 | Subaru | STI | Published as STi (07-20); tagged in two parts, as Impreza WRX STI to 2014 and WRX STI from 2015 |
| 2007-2011 | Subaru | Legacy GT | Published as Legacy GT / Forester XT (07-11) |
| 2007-2011 | Subaru | Forester XT | Published as Legacy GT / Forester XT (07-11) |
Every row here carries a bounded year range against a real make and model, so all four become fitment tags. The STI range is split at the 2015 model change because the storefront records the earlier car as an Impreza WRX STI and the later one as a WRX STI. No engine code appears in any tag; the EJ-series requirement is a matter for the rail and the calibration, not for a searchable fitment record.
Specifications
| Detail | Value |
|---|---|
| Brand | Injector Dynamics |
| Model | ID1750-XDS |
| Manufacturer part number | 1750.48.11.WRX.4 |
| Configuration code | 48.11.WRX as published by Injector Dynamics for the Subaru rows |
| Body length | 48 mm |
| Top interface | Machined 11 mm top |
| Lower interface | Subaru WRX configuration, described in the importer data as a Denso-style low cushion |
| Set quantity | Four injectors |
| Nominal flow rate | 1728 cc/min at 3.0 bar (43.5 psi), measured on E10 emissions certification fuel at 49 C (120 F) |
| Maximum differential fuel pressure | 7.0 bar (101.5 psi) |
| Fuel compatibility | Compatible with methanol, ethanol, MTBE, nitromethane and all known hydrocarbon fuels |
| Electrical connector | USCAR |
| Design intent | Designed specifically for motorsport use, per Injector Dynamics |
| Warranty | One year from date of original purchase against manufacturer defects |
| Packaged contents and weight | Not published by Injector Dynamics for this part number |
What's Included
- Four Injector Dynamics ID1750-XDS fuel injectors in the 1750.48.11.WRX.4 configuration, supplied as one dynamically matched set.
- The manufacturer documents no packaged contents for this number. Plan the job around the injectors alone and source any seals, spacers or wiring parts on their own.
- The offset and slope tables that the engine management system needs are published by the manufacturer separately from the product itself.
About Injector Dynamics
Everything Injector Dynamics publishes about the ID1750-XDS is organised around exact application rows. That is why two sets that look identical on a shelf can carry different numbers: the differences live in the interfaces, not in the flow rating, which is the same across the family.
Related Parts
- Injector Dynamics ID1050-XDS in the WRX lower configuration, set of four
- Injector Dynamics ID1300-XDS in the WRX lower configuration, set of four
- Injector Dynamics ID2600-XDS in the WRX lower configuration, set of four
- Injector Dynamics O-ring and seal service kit for 11 mm top and WRX bottom
- Injector Dynamics 11 mm top O-ring for adapter tops
FAQ
Which flow number should be used when sizing the build?Start from the published 1728 cc/min at 3.0 bar, then correct for the base pressure the fuel system actually runs.
What differential pressure are they rated for?7.0 bar, or 101.5 psi, per the manufacturer specification table.
What does the manufacturer say about fuel compatibility?Compatible with methanol, ethanol, MTBE, nitromethane and all known hydrocarbon fuels.
What is the connector type?USCAR, which is the connector Injector Dynamics specifies across the ID1750-XDS range.
What does dynamically matched mean?Injector Dynamics groups injectors so their dynamic flow behaviour tracks together across the operating range.
What voids the coverage?Failures caused by the wrong fuel type or inadequate filtration, and failures that follow ignoring the manufacturer's fuel and maintenance warnings.
Does the manufacturer service its own injectors?It does, through a cleaning and inspection service that identifies injectors by the serial number at the connector base.
What data does the tuner need?Published offset values at 8, 10, 12, 14 and 16 volts and the flow slope across the pressure range.
What does the manufacturer say about legality?Nothing that establishes street use. The published positioning is motorsport, and no jurisdiction-specific approval is documented.
What does WRX mean in the part number?It is Injector Dynamics' configuration code for the Subaru lower interface on a 48 mm body with an 11 mm top. It identifies geometry, not just a car.
Which Subaru models are listed?WRX from 2002 to 2014, STI from 2007 to 2020, and Legacy GT and Forester XT from 2007 to 2011.
Does this fit the 2004-2006 STI?Not under this number. Injector Dynamics lists the 04-06 STi against a separate top-feed conversion part number, so the two are not interchangeable.
Is the lower a plain O-ring?No. The importer data for this listing describes a Denso-style low cushion, which is why the WRX configuration exists as its own part number.
Will these drop into a 2015 and later WRX?The manufacturer's WRX row ends at 2014 and the STI row runs to 2020. Match the row to the exact car rather than to the badge.
Does the 48 mm figure come from the manufacturer?The numeric segments correspond to the manufacturer's configuration code, and the 48 mm length wording comes from the importer data used to build this listing. Injector Dynamics does not publish a dimensional drawing against this number.
Installation Instructions
The manufacturer publishes no procedure or torque table for this configuration, so the sequence below is deliberately limited to documented guidance plus a pointer to the factory service information.
- Confirm that part number 1750.48.11.WRX.4 is the configuration Injector Dynamics lists for the Subaru WRX 02-14, STI 07-20, and Legacy GT and Forester XT 07-11 before anything is removed from the engine.
- Log each injector's four to seven digit serial number now; it is the identifier the manufacturer uses for warranty and service claims.
- With the system depressurised and isolated, work through the factory rail-removal procedure step by step.
- Resist cutting the plastic O-ring retainer off. Once it is gone it cannot be refitted, and the manufacturer warns of catastrophic engine damage on the wrong application.
- Check that the injector seats fully in the rail and in the port with the 48 mm and its listed interfaces before committing to the install.
- Building the plugs means stripping approximately 5 mm, seating the wire through the seal into the terminal, aligning the conductor with the crimp section and crimping.
- There is no correct pin order for power and ground here; the manufacturer states polarity is not specific.
- Tighten the rail and related hardware strictly to the engine manufacturer's published torque values; the injector supplier documents none.
- Do not start the engine until the current ID1750-XDS dynamic flow and offset values are in the calibration.
- With the engine still stopped, pressurise and inspect all unions and seals, and check the filtration standard the warranty depends on.
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