Precision Raceworks Black Market Parts S55 Port Injection Kit – BMW M2 Competition / M3 / M4 (F8x)

OVERVIEW

The S55 is a direct-injection engine, and on a modified F8x 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 turbos run 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. Precision Raceworks state that the kit includes everything needed to add multi-port injection and is 100% E85 compliant, with new genuine Bosch Motorsport injectors flow matched both static and dynamic, and a detailed certificate of conformance with each kit.

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 flows 750cc at 43.5psi and 1000cc at 72psi, and 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 flows 950cc at 43.5psi and 1226cc at 72.5psi, and gives the headroom wanted for larger upgraded turbo builds and for 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.

The same kit is also offered with Injector Dynamics XDS injectors supplied in place of the Bosch Motorsport set, for builds that want Injector Dynamics' characterization data and the higher flow ceilings their range reaches. The Injector Dynamics sets run from 1065cc to 2600cc and are supplied as a matched set of six on the same Precision Raceworks kit hardware, so the choice is purely about the injector rather than the rest of the kit.

SPECS

• Engine compatibility: all S55 engines
• Injector brand: genuine Bosch Motorsports
• Advertised flow, 750cc option: 750cc @ 43.5psi, 1000cc @ 72psi
• Advertised flow, 950cc option: 950cc @ 43.5psi, 1226cc @ 72.5psi
• Fuel compatibility: all known fuels
• Flow matched: 2% or better
• Connection type: EV6 (US Car Connector)
• Hardware included: yes, stainless OEM style studs
• Gasket type: OEM spec manifold gaskets
• Fuel distribution pattern: diagonal equal distribution across all cylinders
• Injector Dynamics ID1050-XDS option: 1065 cc/min @ 3.0 bar (43.5 psi), maximum differential fuel pressure 10.0 bar (145 psi), compatible with all known fuels
• Injector Dynamics ID1300-XDS option: 1335 cc/min @ 3.0 bar (43.5 psi), maximum differential fuel pressure 7.0 bar (101.5 psi), designed specifically for alternative fuels
• Injector Dynamics ID1750-XDS option: 1728 cc/min @ 3.0 bar (43.5 psi), maximum differential fuel pressure 7.0 bar (101.5 psi)
• Injector Dynamics ID2600-XDS option: 2600 cc/min @ 3.0 bar (43.5 psi), maximum differential fuel pressure 9.0 bar (130.5 psi), requires a minimum of 11 volts
• Injector Dynamics XDS connector type: USCAR (EV6), the same connector Precision Raceworks specifies for this kit
• Injector Dynamics supplies offset and slope characterization data with every set

PARTS INCLUDED

• Port injection plate with OEM spec manifold gaskets
• New genuine Bosch Motorsport port injectors in the flow rate selected, flow matched both static and dynamic to 2% or better (not supplied with the No Injectors option)
• Stainless OEM style studs
• Detailed certificate of conformance with each kit
• No Injectors option: ships the plate, gaskets and hardware only, with no injectors supplied
• Injector Dynamics option: a matched set of six Injector Dynamics XDS injectors in the flow rate selected, supplied in place of the Bosch Motorsport set

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. 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 the F8x.
• Port injection feed line to run the supply from the low pressure system to the plate. Contact us for the correct line for your car.
• 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.
• Supporting tune, required. The port injectors must be commissioned and the fuel split calibrated: Bootmod3 S55 Tune – BMW M3 / M4 / M2 Competition (F8x) or MHD Super License – BMW S55 (F-Series).
• Piggyback option, if you are running a JB4 rather than a flashed tune: Burger Motorsports JB4 Tuner – BMW M3 / M4 / M2C (S55, F8x).
• 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 car.

Installation

• Precision Raceworks publishes no PDF installation guide and no installation video for this kit. Contact us if you need fitting guidance.

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.
• Injector Dynamics XDS injectors use the USCAR (EV6) connector, which is the connector Precision Raceworks specifies for this kit. The 34 mm body with 14 mm rail bores is the standard EV14-compact envelope, but Precision Raceworks does not publish this kit's rail bore and injector body dimensions — contact us to confirm fitment before ordering an Injector Dynamics set.
• The ID2600-XDS is not compatible with ethers (MTBE, ETBE, TAME) or nitromethane. The ID1050-XDS, ID1300-XDS and ID1750-XDS are compatible with all known fuels.
• Injector Dynamics publishes offset and slope data for each injector; whether your chosen controller accepts that data is worth confirming before ordering, particularly at the highest flow rates where a supplemental port injector runs at very short pulsewidths.
• The Injector Dynamics options are priced as the bare Precision Raceworks kit plus the matching six-injector Injector Dynamics set, which we also sell on its own: Injector Dynamics Upgraded Fuel Injectors (ID1050x / ID1300x / ID1750x / ID2600x).

PART NUMBER

• 601-0016 – 750cc
• 601-0189 – 950cc
• 601-0223 – No Injectors
• 1050.34.14.14.6 – Injector Dynamics ID1050-XDS, set of six
• 1300.34.14.14.6 – Injector Dynamics ID1300-XDS, set of six
• 1750.34.14.14.6 – Injector Dynamics ID1750-XDS, set of six
• 2600.34.14.14.6 – Injector Dynamics ID2600-XDS, set of six

VEHICLE APPLICATIONS