Injector Dynamics Fuel Injectors for Subaru

• Injector Dynamics fuel injectors (all vehicles)
• XDS fuel injectors - Subaru WRX / STI, 48mm, set of 4
• XDS fuel injectors - Subaru WRX / STI (GC8), 48mm, set of 4
• XDS fuel injectors - Subaru BRZ (ZC6/ZD8), 36mm, set of 4
• IDF750 and F1250 in-line fuel filters, elements, mounts and O-ring kits
• BPC100 brushless pump controller, with or without the E5LM fuel pump
• Dual fuel pressure/temperature sensor to suit the ID750 filter
• Injector Dynamics for Toyota (86 / GR86)
• Injector Dynamics universal fitment parts

Start with the chassis and engine. Turbocharged WRX and STI models running EJ20 or EJ25 use the 48mm injector length, including the GC8 WRX/STI set that is shared with the Honda Integra DC5. The naturally aspirated FA20 BRZ (ZC6/ZD8), shared with the Toyota 86 and GR86 (ZN6/ZN8), uses the shorter 36mm set.

XDS injectors for Subaru are offered in 1050, 1300, 1750 and 2600cc flow ratings. The 1050cc size suits the bulk of bolt-on and lightly built turbo setups on 98 RON and moderate boost E85 combinations without pushing duty cycle into unsafe territory. The 1300, 1750 and 2600cc sizes step the flow up for high-boost E85, methanol or dedicated time attack builds.

The FA20 in the BRZ is a different proposition to the turbocharged EJ. Because it is naturally aspirated from the factory, sizing is based on whatever turbo or supercharger kit is fitted rather than a straight swap from an EJ combination. Contact us with your kit and fuel choice before ordering.

Check fuel rail and injector clip compatibility before you order, as some EJ and FA applications need adapter tops or a different injector length depending on whether you are running a factory or aftermarket rail.

Installation by a professional is recommended. Fuel system work involves pressurised lines and precise sealing, so it should be carried out by a qualified workshop.

Return and returnless fuel systems behave differently under load. If your car is still on the factory returnless setup, ask us whether it can support the injector size you're after or whether a return-style fuel system upgrade needs to happen alongside it.

Injector clocking - the angle of the spray pattern relative to the intake port - matters on some manifolds. Get it wrong and fuel can wet the port wall instead of atomising properly.

A retune is required any time you go up in injector size. Don't start the car and drive it on the old map; book in with your tuner before the injectors go in, not after.

Supporting parts to consider: an in-line fuel filter such as the IDF750 or F1250 with the matching bracket, a brushless pump controller and pump, and a fuel pressure/temperature sensor for monitoring.

Will Injector Dynamics injectors fit my factory fuel rail?
Most EJ and FA applications work with the factory rail, but some sizes need an adapter top or a rail swap. Check the fitment notes on the product page or ask us before you buy.

Do I need to change my ECU to run these?
No, but you do need a tuner who can load the supplied characterisation data and adjust the fuel map. Haltech, Link, MoTeC and factory reflash platforms all handle this.

Do I need a retune after fitting bigger injectors?
Yes, every time. Injector size changes fuelling across the whole map, so the car needs to be retuned before it is driven hard.

Does the BRZ need different injectors to the WRX or STI?
Yes. The BRZ (ZC6/ZD8) uses a 36mm set, while turbocharged WRX and STI models use a 48mm set, and BRZ sizing depends on the turbo or supercharger kit fitted.