OVERVIEW

The N54 and N55 are direct-injection engines, and on a modified car direct injection is the first system to run out of capacity. The high pressure fuel pump and the factory direct injectors have a finite ceiling, and once boost and airflow climb past it the engine runs out of fuel before the turbo runs out of air. Port injection answers that by adding a second, independent set of injectors upstream of the intake valves, mounted on their own rail and fed from the low pressure side of the fuel system. Direct injection keeps handling idle, cruise and part throttle exactly as the factory intended, and the port injectors are brought in under boost to supply the fuel the DI system can no longer deliver.

This is a plate-style kit. Rather than drilling and tapping the factory intake manifold runners, a machined injector plate is sandwiched between the cylinder head and the intake manifold, and the injectors spray from the plate into the runners immediately ahead of the intake valves. The manifold comes off and goes back on with OEM spec gaskets and stainless OEM style studs, and the port injection hardware sits in the joint between them. The kit is a Black Market Parts (BMP) product, sold by Precision Raceworks and catalogued under Precision Raceworks part numbers; it uses genuine Bosch Motorsport injectors that are flow matched to 2% or better, and every kit ships with a certificate of conformance recording the measured flow data for the injectors supplied.

Choosing a flow rate is a question of how much fuel the engine still needs once direct injection has given everything it has. The 750cc set is the choice for stock-turbo and moderately upgraded cars that need supplemental fuel to hold a target on pump gas or an ethanol blend. The 950cc set gives more headroom and suits larger upgraded or single turbo builds, and cars running full E85 where the higher volumetric demand of ethanol makes the extra flow worthwhile. The No Injectors option supplies the kit without injectors, for builders who already own a matched Bosch Motorsport set or whose tuner has specified a particular injector. Flow rate is the only option on this kit; Precision Raceworks does not offer a colour choice for the N54/N55 plate.

SPECS

Engine compatibility: all N54 and N55 engines
Injector brand: genuine Bosch Motorsports
Advertised flow: 750cc @ 43.5psi, 1050cc @ 72.5psi
Advertised flow, 950cc option: 950cc @ 43.5psi, 1226cc @ 72.5psi
Fuel compatibility: all known fuels
Flow matched: 2% or better (250% more accurate than off the shelf injectors)
Connection type: EV6 (called US Car Connector) works with AIC and JB4 Controller
Hardware included: yes, stainless OEM style studs
Gasket type: OEM spec manifold gaskets used in port injection plate (included)
Fuel distribution pattern: diagonal equal distribution across all cylinders

PARTS INCLUDED

Port injection plate with the OEM spec manifold gaskets used in the plate
Genuine Bosch Motorsport port injectors in the flow rate selected, flow matched to 2% or better (not supplied with the No Injectors option)
Stainless OEM style studs
Certificate of conformance with each kit, giving the flow data needed for tuning
No Injectors option: ships the plate, gaskets and hardware only, with no injectors supplied

TECH RESOURCES

Additional Parts Required

Supplemental injector controller, mandatory. Precision Raceworks state plainly that use of a supplemental pump controller is required; the factory DME has no output for these injectors and will not drive them. The EV6 connectors work with AIC and JB4 controllers, and we stock Motiv ReFlex Plus I/O Integration – BMW / Toyota A9x (Flying Lead) for this role.
Upgraded low pressure fuel supply. Port injection is fed from the low pressure side, so the car needs an in-tank pump and supply capable of holding rail pressure at the target flow. Contact us for the correct pump for your chassis.
Port injection feed line to run the supply from the low pressure system to the plate. Contact us for the correct line for your chassis.
Extended intake manifold studs and OE spec intake manifold o-rings. The plate adds stack height between the cylinder head and the stock manifold, so factory length studs and used o-rings should not be reinstalled. Contact us for the correct hardware for your engine.
Supporting tune, required. The port injectors must be commissioned and the fuel split calibrated. For N55 F-chassis cars: Bootmod3 N55 F-Series Tune – BMW M135i / M235i / 335i / 435i / M2 (N55) or MHD Super License – BMW N55 (F-Series). For N54 cars: MHD Super License – BMW N54.
Piggyback option, if you are running a JB4 rather than a flashed tune: Burger Motorsports JB4 Tuner – BMW 135i / 335i / 535i / 1M / Z4 (N54), Burger Motorsports JB4 Tuner – BMW 135i / 335i / X5 / X6 (N55 E-Chassis) or Burger Motorsports JB4 Tuner – BMW M2 / M235i / 335i / 435i (N55 F-Chassis).
Ethanol content sensor, required if running E85 or an ethanol blend so the controller and tune can read fuel content. Contact us for the correct flex fuel hardware for your chassis.

Installation

Precision Raceworks publish no PDF installation guide for this kit. The two videos below are the manufacturer's own installation coverage and are the reference material they provide.
Black Market Parts N54 / N55 port injection installation video 1 (Precision Raceworks)
Black Market Parts N54 / N55 port injection installation video 2 (Precision Raceworks)

Notes

Injector flow rate changes the price and the part number; confirm the option you have selected before ordering.
Port injection is a competition and off-road modification. It is not emissions compliant and is not intended for use on pollution controlled vehicles.
Price is for the item selected only. Labor, tuning and any additional parts are not included.
Fitment is published by engine family. Confirm your engine code before ordering, as the same model name can carry a different engine depending on market and model year.

PART NUMBER

601-0015 – 750cc
601-0188 – 950cc
601-0227 – No Injectors

VEHICLE APPLICATIONS

Make	Model	Chassis	Engine	Years
BMW	135i	E82	N54 3.0L Twin-Turbo I6	2007–2010
BMW	135i	E82	N55 3.0L Turbo I6	2011–2013
BMW	135i	E88	N54 3.0L Twin-Turbo I6	2007–2010
BMW	135i	E88	N55 3.0L Turbo I6	2011–2013
BMW	135iS	E82	N55 3.0L Turbo I6	2013
BMW	1M	E82	N54 3.0L Twin-Turbo I6	2011
BMW	335i	E90	N54 3.0L Twin-Turbo I6	2007–2010
BMW	335i	E90	N55 3.0L Turbo I6	2011
BMW	335i	E92	N54 3.0L Twin-Turbo I6	2007–2010
BMW	335i	E92	N55 3.0L Turbo I6	2011–2013
BMW	335i	E93	N54 3.0L Twin-Turbo I6	2007–2010
BMW	335i	E93	N55 3.0L Turbo I6	2011–2013
BMW	335i	F30	N55 3.0L Turbo I6	2012–2015
BMW	335i GT xDrive	F34	N55 3.0L Turbo I6	2014–2016
BMW	335i xDrive	E90	N54 3.0L Twin-Turbo I6	2009–2010
BMW	335i xDrive	E90	N55 3.0L Turbo I6	2011
BMW	335i xDrive	E92	N54 3.0L Twin-Turbo I6	2009–2010
BMW	335i xDrive	E92	N55 3.0L Turbo I6	2011–2013
BMW	335i xDrive	F30	N55 3.0L Turbo I6	2012–2015
BMW	335iS	E92	N54 3.0L Twin-Turbo I6	2011–2013
BMW	335iS	E93	N54 3.0L Twin-Turbo I6	2011–2013
BMW	335xi	E90	N54 3.0L Twin-Turbo I6	2007–2008
BMW	335xi	E92	N54 3.0L Twin-Turbo I6	2007–2008
BMW	435i	F32	N55 3.0L Turbo I6	2014–2016
BMW	435i	F33	N55 3.0L Turbo I6	2014–2016
BMW	435i Gran Coupe	F36	N55 3.0L Turbo I6	2015–2016
BMW	435i xDrive	F32	N55 3.0L Turbo I6	2014–2016
BMW	435i xDrive	F33	N55 3.0L Turbo I6	2014–2016
BMW	535i	E60	N54 3.0L Twin-Turbo I6	2008–2010
BMW	535i	F10	N55 3.0L Turbo I6	2011–2017
BMW	535i GT	F07	N55 3.0L Turbo I6	2011–2017
BMW	535i GT xDrive	F07	N55 3.0L Turbo I6	2011–2017
BMW	535i xDrive	E60	N54 3.0L Twin-Turbo I6	2009–2010
BMW	535i xDrive	F10	N55 3.0L Turbo I6	2011–2016
BMW	640i	F12	N55 3.0L Turbo I6	2012–2018
BMW	640i	F13	N55 3.0L Turbo I6	2012–2018
BMW	640i Gran Coupe	F06	N55 3.0L Turbo I6	2013–2017
BMW	640i xDrive	F12	N55 3.0L Turbo I6	2014–2017
BMW	640i xDrive	F13	N55 3.0L Turbo I6	2014–2017
BMW	640i xDrive Gran Coupe	F06	N55 3.0L Turbo I6	2014–2017
BMW	740i	F01	N54 3.0L Twin-Turbo I6	2011–2012
BMW	740i	F01	N55 3.0L Turbo I6	2013–2015
BMW	740Li	F02	N54 3.0L Twin-Turbo I6	2011–2012
BMW	740Li	F02	N55 3.0L Turbo I6	2013–2015
BMW	740Li xDrive	F02	N55 3.0L Turbo I6	2013–2015
BMW	ActiveHybrid 3	F30	N55 3.0L Turbo I6	2013–2015
BMW	M135i	F20	N55 3.0L Turbo I6	2013–2016
BMW	M135i	F21	N55 3.0L Turbo I6	2013–2016
BMW	M2	F87	N55 3.0L Turbo I6	2016–2018
BMW	M235i	F22	N55 3.0L Turbo I6	2014–2016
BMW	M235i	F23	N55 3.0L Turbo I6	2014–2016
BMW	M235i xDrive	F22	N55 3.0L Turbo I6	2015–2016
BMW	X1	E84	N55 3.0L Turbo I6	2013–2015
BMW	X3	F25	N55 3.0L Turbo I6	2011–2017
BMW	X4	F26	N55 3.0L Turbo I6	2015–2018
BMW	X5	E70	N55 3.0L Turbo I6	2011–2013
BMW	X5	F15	N55 3.0L Turbo I6	2014–2018
BMW	X6	E71	N54 3.0L Twin-Turbo I6	2008–2010
BMW	X6	E71	N55 3.0L Turbo I6	2011–2014
BMW	X6	F16	N55 3.0L Turbo I6	2015–2017
BMW	Z4	E89	N54 3.0L Twin-Turbo I6	2009–2014