Holley HP EFI is a 60-pin wire-in Holley ECU on 2 connectors: J1A (34 pins) and J1B (26 pins).
It has 8 injector outputs and 8 ignition outputs. The injector drivers are peak-and-hold, so low-impedance injectors run without a resistor pack. The ignition outputs are logic-level. Smart coils plug straight in; dumb coils need an igniter in between.
There are 2 dedicated trigger inputs, each happy with a VR or a Hall sensor. Two knock inputs cover both banks of a V engine. It has an onboard wideband controller, so a sensor wires straight in.
It does not drive an electronic throttle, so plan on a cable throttle. One CAN bus handles dashes, PDMs and expansion. Five outputs can switch 12V as well as ground.
Spec sheet
| Connectors | J1A (34), J1B (26)60 pins in this profile |
|---|---|
| Injector outputs | 8peak-and-hold (low-impedance capable) |
| Ignition outputs | 8logic-level: smart coils, or an igniter for dumb coils |
| Dedicated trigger inputs | 2VR or Hall |
| Knock inputs | 2 |
| Onboard wideband controllers | 1 |
| Onboard MAP sensor | Not listed by the maker |
| CAN buses | 1 |
| Drive-by-wire | No |
| High-side outputs | 5 |
| Half-bridge outputs | 4H-bridge pairs for a throttle motor or stepper |
| 5V sensor supply | 1 pin |
Which builds it suits
Of the 58 swap presets in the planner, 6 fit as they are and 21 fit with add-ons; 31 do not fit at all. The add-on it asks for most often is an external igniter. Where it falls short, it is usually not enough drive-by-wire throttle motor (h-bridge). The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.
It runs the Nissan RB25DET non-Neo S2 (R33, smart coils), Nissan RB26DETT (R34, smart coils) and Mazda Rotary 13B-REW (FD RX-7) presets with nothing added. The Ford Modular 4.6 2V (SOHC) needs a CAN wideband module and an external igniter. It can't run the Ford Coyote 5.0 Gen2 (2015-17): not enough drive-by-wire throttle motor (h-bridge). It can't run the Honda K20 (i-VTEC 2.0 NA): not enough drive-by-wire throttle motor (h-bridge).
Fits as it is 6
Fits with add-ons 21
- Toyota 1JZ-GE distributor (NA, early) with an external igniter
- Toyota 1JZ-GE VVT-i (coil pack) with an external igniter
- Toyota 1JZ-GTE non-VVTi with an external igniter
- Toyota 1JZ-GTE VVTi with an external igniter
- Toyota 2JZ-GE distributor (NA, early) with an external igniter
- Toyota 2JZ-GE VVT-i (coil pack) with an external igniter
- Toyota 2JZ-GTE non-VVTi with an external igniter
- GM LS1 (Gen3 5.7 alum) with a CAN wideband module
- GM LS6 (Gen3 5.7 alum) with a CAN wideband module
- GM LS LQ4/LQ9 (Gen3 6.0 iron) with a CAN wideband module
- Ford Modular 4.6 2V (SOHC) with a CAN wideband module, an external igniter
- Ford Modular 4.6 4V Cobra (NA, cable) with a CAN wideband module, an external igniter
- Ford Modular 4.6 4V Terminator (S/C, cable) with a CAN wideband module, an external igniter
- Ford Modular 5.4 4V Ford GT (S/C, cable) with a CAN wideband module, an external igniter
- Nissan RB20DET with an external igniter
- Nissan RB25DET non-Neo S1 (R33, dumb coils) with an external igniter
- Nissan RB26DETT (R32/R33, dumb coils) with an external igniter
- Nissan SR20DET (S13) with an external igniter
- Nissan SR20DET (S14) with an external igniter
- Subaru EJ/FA EJ20 turbo single-AVCS (EJ207 v7-9) with a CAN wideband module
- Subaru EJ/FA EJ20 turbo dual-AVCS (EJ207 GRB 2008+) with a CAN wideband module
Does not fit 31
- Toyota 2JZ-GTE VVTi not enough drive-by-wire throttle motor (h-bridge)
- GM LS2 (Gen4 6.0 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LS3 (Gen4 6.2 alum, car) not enough drive-by-wire throttle motor (h-bridge)
- GM LS L76 (Gen4 6.0 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LS L92 (Gen4 6.2 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LS LY6/L96 (Gen4 6.0 iron) not enough drive-by-wire throttle motor (h-bridge)
- GM LSA (Gen4 6.2 alum, S/C) not enough drive-by-wire throttle motor (h-bridge)
- GM LT1 (Gen5 6.2 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LT4 (Gen5 6.2 alum, S/C) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote 5.0 Gen1 (2011-14) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote 5.0 Gen2 (2015-17) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote 5.0 Gen3 (2018-23) not enough drive-by-wire throttle motor (h-bridge)
- Ford Modular 5.4 4V GT500 (S/C, DBW) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote Voodoo 5.2 (GT350, flat-plane) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote Predator 5.2 (GT500, cross-plane, S/C) not enough drive-by-wire throttle motor (h-bridge)
- Ford Barra 4.0 NA (182/190/195) not enough drive-by-wire throttle motor (h-bridge)
- Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VR38DETT (R35 GT-R) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VQ35DE (base, 2003-04) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VQ35DE Rev-Up (2005-06) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VQ35HR (High-Rev, 2007+) not enough drive-by-wire throttle motor (h-bridge)
- Honda K20 (i-VTEC 2.0 NA) not enough drive-by-wire throttle motor (h-bridge)
- Honda K24 (i-VTEC 2.4 NA) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA EJ25 turbo single-AVCS (EJ257 2004-07) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA EJ25 turbo dual-AVCS (EJ257 2008+) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA FA20D (BRZ/86 NA) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA FA20DIT (WRX turbo 2015+) not enough drive-by-wire throttle motor (h-bridge)
- Mazda Rotary 13B-MSP Renesis (RX-8 manual, 6-injector) not enough drive-by-wire throttle motor (h-bridge)
- Mazda Rotary 13B-MSP Renesis (RX-8 auto, 4-injector) not enough drive-by-wire throttle motor (h-bridge)
- BMW S54 (3.2 NA I6, E46 M3) not enough knock inputs
- BMW N54 (3.0 twin-turbo I6) not enough drive-by-wire throttle motor (h-bridge)
Plan a build around the Holley HP EFI
Pin table
By connector: J1A carries 2 trigger inputs, 2 knock inputs and 10 analog inputs; J1B carries 8 injector outputs, 8 ignition outputs and 4 H-bridge outputs.
Show all 60 pins
| Pin | Function |
|---|---|
| J1A A1 | Coil - Input (RPM pickup) |
| J1A A2 | Fuel Pump Out (+12V, 10A) |
| J1A A3 | Input #2 (programmable F52THG) |
| J1A A4 | Input #4 (programmable F5G) |
| J1A A5 | TPS Input |
| J1A A6 | Points Trigger Output |
| J1A A7 | WB1 COMPR2 |
| J1A A8 | WB1 Shield |
| J1A A9 | WB HTR - |
| J1A A10 | Switched +12V Input |
| J1A A11 | Manifold Air Temp Input |
| J1A A12 | Input #1 (programmable F52THG) |
| J1A A13 | Input #3 (programmable F5G) |
| J1A A14 | Cam/Crank Ground (IPU/shield) |
| J1A A15 | Gauge Digital Output |
| J1A A16 | WB1 COMPR1 |
| J1A A17 | WB1 VS-/IP+ |
| J1A A18 | Sensor Ground |
| J1A A19 | Engine Coolant Temp Input |
| J1A A20 | Oil Pressure Input |
| J1A A21 | Knock #2 Input |
| J1A A22 | Cam Sync Input / Ign Bypass Out |
| J1A A23 | MAP Sensor Input |
| J1A A24 | CAN Lo |
| J1A A25 | WB1 VS+ |
| J1A A26 | Sensor +5V |
| J1A A27 | NOT USED |
| J1A A28 | EST/Spout Output (logic-level) |
| J1A A29 | Knock #1 Input |
| J1A A30 | Crank Speed Input (VR or Hall) |
| J1A A31 | Fuel Pressure Input |
| J1A A32 | CAN Hi |
| J1A A33 | WB1 IP+ |
| J1A A34 | WB HTR + |
| J1B B1 | IAC A Lo |
| J1B B2 | IAC A Hi |
| J1B B3 | Output #4 (programmable G P-) |
| J1B B4 | Injector F Output |
| J1B B5 | Injector G Output |
| J1B B6 | Injector H Output |
| J1B B7 | Injector E Output |
| J1B B8 | IAC B Lo |
| J1B B9 | IAC B Hi |
| J1B B10 | Output #3 (programmable G P-) |
| J1B B11 | Output #2 (programmable H P+) |
| J1B B12 | Output #1 (programmable H P+) |
| J1B B13 | Injector D Output |
| J1B B14 | EST Ground Output |
| J1B B15 | EST 2 Output (cyl #2) |
| J1B B16 | EST 4 Output (cyl #4) |
| J1B B17 | EST 6 Output (cyl #6) |
| J1B B18 | EST 8 Output (cyl #8) |
| J1B B19 | Injector A Output |
| J1B B20 | EST 12V Output (coil/module 12V) |
| J1B B21 | EST 1 Output (cyl #1) |
| J1B B22 | EST 3 Output (cyl #3) |
| J1B B23 | EST 5 Output (cyl #5) |
| J1B B24 | EST 7 Output (cyl #7) |
| J1B B25 | Injector C Output |
| J1B B26 | Injector B Output |
Other Holley ECUs
The closest Holley unit is the Holley Terminator X. Against it, this one has peak-and-hold injector drive (the Terminator X is saturated).
Source: Holley documentation for the HP EFI
Always verify against the manufacturer's manual and your tuner before wiring.