HP Multi-Port EFI systems for small or big block Chevys are ready for the street or strip with the simple swap of an intake! Whether you have a stock engine, crate or custom-built engine, HP Multi-Port systems can help you maximize performance! By utilizing a laptop (or the optional 5.7” full color touch screen LCD) along with the HP’s self-tuning capabilities, the HP Multi-Port EFI system will get you to the cruise or race in no time. HP Multi-Port Systems include: intake manifold, billet throttle body, ECU, wiring harness, fuel rails, and related small parts. Fuel pump and injectors are available separately to fit your requirements.
ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance. (Certifications do not apply to other components of kit.)
Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed inputs, fuel pump control, AC inputs, timing retard inputs and various other uses. When selecting an ECU, users need to ensure their planned controls can be run with the 4 inputs and 4 outputs as certain combinations may use more I/Os than are available. If more I/Os are required, users should choose the Dominator VMS. MPFI Systems do not include injectors or a fuel pump. They need to be sized for the application and can be purchased seperately from Holley.
Not Sure? Review this product documentation before you buy!
Installation Manual| ECU | |
| Boost Control | Integrated (Utilizing at least two I/O Ports.) Control based on time, gear, speend, and/or manual selection. Requires 557-200 Boost Control Solenoid Valve. |
| DIS Outputs | Can drive up to 8 "smart" or Holley coils (can drive 2-wire coils with 554-112 Coil Driver) |
| Family | HP |
| Fueling Strategy | Speed Density, Alpha-N, or Combination |
| Includes Power Harness | No (Purchase 558-308 Seperately) |
| Injector Drivers | Eight Sequentially-Driven Peak & Hold Drivers capable of driving up to 16 low or high impedance injectors |
| Internal Datalogging | 4 GB |
| Knock Control Channels | 2 |
| Nitrous Control | Integrated 4 Stage (Utilizing at least two I/O ports.) Progressive control utilizing 554-111 solenoid driver. |
| Number of Cylinders | 4, 6, or 8 (Even Fire Only) |
| User Configurable I/O | 4 programmable PWM outputs (2 high and 2 low) and 4 fully configurable inputs. |
| User-Selectable MAP Storage | N/A |
| Water-Methanol Control | Integrated (Utilizing at least two I/O Ports.) Recommend Holley Water-Methanol pump, nozzles, and install kit. |
| Throttle Bodies | |
| Airflow Rate (CFM) | 1000 CFM |
| Barrels (BBL) | 4 |
| Gaskets Included | Yes |
| IAC Motor Included | Yes |
| Injectors Included | Yes |
| Style | Multi-Point Fuel Injection |
| Throttle Bore Diameter (ea) | 44.45 |
| TPS Sensor Included | Yes |
| Intake Manifolds | |
| Manifold Type | Single Plane EFI |
| Throttle Body Flange | Square Bore |
| Complete Manifold | Yes |
| RPM Range | 2000-7000 |
| Fuel Rail Included | Yes |
| Front Height | 5.50 Inches |
| Rear Height | 5.50 Inches |
| Fuel Pressure Regulators | |
| Pressure Range | 35 psi - 65 psi |
| Rebuildable | Yes (PN 512-1) |
| Style | Mounted on Fuel Rail |
| Fuel Rails | |
| Inside Diameter | 3/8" / -6 AN |
| Fuel Filters | |
| Element Material | Paper |
| Filter Type | Inline |
| Micron Filtration | Prefilter: 20 Micron / Postfilter: 10 Micron |
| Mounting Bracket Included | Prefilter: No / Postfilter: Yes |
| Outside Diameter | Prefilter: 1.94 Inches / Postfilter: 2.17 Inches |
| Harnesses | |
| Harness Type | Power Harness, MPFI Main Harness, v8 Injector Harness, Small Cap HEI Distributor Adapter Harness |
| Terminated | Yes |
| Crank Timing | |
| Sensor Harness Included | No (Ignition Adapter for Small Cap HEI Distributor Only) |
| Sensors | |
| Type | 1 BAR MAP, Throttle Position (Integrated in TB); Coolant Temperature, Wideband O2 (Bosch) and Air Temperature Sensor; Oil and Fuel Pressure Sensors optional, not included |
| General | |
| Application | Small Block Chevrolet, Early to Late Heads |
| Color | Clear Billet Aluminum Throttle Body with Satin Aluminum Intake |
| Emission Code | 3 |
| Unit of Sale | Kit |
