RADIUM ENGINEERING SUBARU FUEL PRESSURE REGULATOR UPGRADE KIT - 08-21 STI
This kit is designed for use in the USDM 2008+ Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly, shown below. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand.
The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator, and returning to the tank. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues.
The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow.
Available with an optional 0-100psi fuel pressure gauge. Pressure gauge is sold separately HERE using Radium part number 20-0029 and adapter fitting HERE using 14-0119.
The kit installs in the same location as the OEM fuel pressure regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a stable vacuum signal.
- This will eliminate the 2800 RPM fuel stumble found on stock vehicles.