BRZ Fuel System Component Walkthrough

[DeatschWerks]

BRZ OE PORT Fuel System Review…

PART 1: PORT FUEL INJECTORS

Subaru PN: 16611AA860
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 BRZ 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:

BRZ injector (side view)



BRZ injector nozzle (bottom view)



BRZ injector connector (top view)

[DeatschWerks]

PART 2: FUEL PUMP MODULE

Subaru PN: 42021CA000
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 BRZ 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:

BRZ module – assembled (side view)



BRZ module – assembled (top view)



BRZ module - opened

[DeatschWerks]

PART 3: FUEL PUMP

Subaru 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:

BRZ pump (side view)



BRZ pump inlet



BRZ pump outlet

[bhhamblin]

Good read, thank you!

[RallySport Direct]

Wow great info, thanks so much!

Rick

[DeatschWerks]

Got this heads up from an IWSTi Member >

Originally Posted by suby2low

I would like to throw a couple of words of caution out there about the high pressure side of this fuel system. (Have been to some initial training on the FRS). The high pressure side of the fuel system has a built in pressure sensor that we can look at with scan tool data. We have seen pressures just north of 3000 Psi. The cautionary tail is that the high side pressure DOES NOT bleed down when the car is shut off. Even over an extended period of time. A couple of American engineers found this out the hard way. There is a high pressure bleed down procedure using the factory scan tools. Please be careful if you attempt to work on the fuel system.

[HiProfile]

Any pictures of the intake manifold where the port injectors install? I'm curious if injectors with a taller body or shorter outlets would work.

In any case, the stockers look like they can be modified for more flow. Maybe not by a factor as high as the baby-blue WRX's, but at least from 205cc to 350-400cc. If they were normal Denso's we'd see 475-525cc.

[Tradewind]

BRZ86 pump info etc very information

Thanks deatschworks - the makers of the best fuel equipment for Subaru!

[DeatschWerks]

I don't have any pics of the manifold at this time, HiProfile.

Appreciate that Tradewind. Thanks for the support!

[illmatic]

Really great breakdown on the port and direct injection system in the Technician Reference Booklet:
https://www.facebook.com/download/45...7-3-12STIS.pdf

If it is not working, I can rehost it.
https://docs.google.com/open?id=0B3E...TVxZHRnVlVWcjQ

[DeatschWerks]

That's a nice piece for reference, illmatic. I'm sure that will come in handy to us and many others. Thanks!

[SilverSurfer04STi]

Great and informative thread. Thanks all for posting this info.