FRS OE PORT Fuel System Review…

To look at the future possibilities of the FRS engine, we first need to understand where it starts. Below is a walkthrough detailing some of the OE fuel system components on the FRS.

PART 1: PORT FUEL INJECTORS

Scion PN: SU-003-003-26
Manufacturer: Denso
OE PN: 2040

Testing Data:



Flow Data Summary:
Static Flow: 205cc/min at 43.5psi (3bar)
Spray Pattern: dual beam – split V (~10*)
Dynamic Flow: see reports for detailed flow data

Injector Description:

The Denso injector used in the FRS is different from a lot of other injectors. The injector utilizes a 11mm upper o-ring, sumitomo electrical connector, and a high impedance 12.3ohm coil, which is all fairly common. However, the injector body is very short (40mm functional length) and the nozzle is extended 20mm. This yields an overall overall length of 68mm.

Pictures:

FRS injector (side view)



FRS injector nozzle (bottom view)



FRS injector connector (top view)



PART 2: FUEL PUMP MODULE

Scion PN: SU-003-01-018
Manufacturer: Denso
OE PN: 291100-0090

Testing Data:



Module Description:

The module (aka bucket, aka assembly) is fairly standard in size, shape, and design. The FRS fuel system appears to be returnless because there is only one outlet on the module (see pics). There is an internal regulator that keeps the system pressure a constant 4 bar (58psi), which also indicates a returnless system. I am not aware of another manifold referenced regulator anywhere else in the system. There is also a post fuel pump filter integrated into the module. Both the pump and internal regulator are held into place with a special pre-filter (aka sock) that has integrated clips. Fuel pump modules often have an effect on flow rates. Therefore the OE pump was flow tested both installed into the module and outside of the module. See the report for detailed flow results.

Pictures:

FRS module – assembled (side view)



FRS module – assembled (top view)



FRS module - opened



PART 3: FUEL PUMP

Scion PN: NA – only sold with module
Manufacturer: Denso
OE PN: 291100-1050

Testing Data:



Pump Description:

The first obvious thing to note is that the fuel pump is very small. The overall length is 96mm and the diameter is 38mm. Other than the size, the pump is pretty normal. It features a single stage, single row turbine impeller, internal check valve to hold system pressure and a spring and disc style PRV (pressure release valve). The connector is not a standard style. When tested, the pump operated very quietly and smoothly drawing very little current, but also flowing quite modestly. The PRV begins to opens at 50psi which is interesting given that the internal regulator is set for 58psi. The PRV does not bleed off a lot of fuel so effects on flow are pretty minimal.

Pictures:

FRS pump (side view)



FRS pump inlet



FRS pump outlet

 

Got this heads up from an IWSTi Member >

 

Great info! Thanks Chris.

Can we get this stickied please?