Holley efi inputs and outputs

Holley efi inputs and outputs DEFAULT

For high performance machines in the 21st Century, it’s all about control. Horsepower has never been easier to make, but to apply that new-found power means exerting control. Electronics have become the easiest way to capture data, create solutions, and maintain control over all that horsepower.

Holley has built quite a name with their line of high performance fuel injection systems and has recently expanded the product lines to include affordable ECU packages like the HP and Terminator X / Terminator X MAX line of EFI systems. While these systems use similar software to the top-of-the-line Dominator, these more affordable systems make entry into electronic fuel injection easier and more affordable.

The main advantage that the Dominator ECU enjoys over the less pricey HP and even more affordable Terminator X series is the aforementioned control. Where the Dominator differs is that it offers nearly 50 inputs and 36 output circuits – termed I/O’s. The less expensive HP and Terminator X are limited to a maximum of four inputs and four outputs. But drag racers, track day enthusiasts, and enlightened street drivers are beginning to realize that having more I/O’s offers opportunities.

Holley I/O Add-On Module

The I/O Module is compact and will fit nearly anywhere in the interior. The I/O Module kit (PN 554-165) includes a dedicated connector plus several looms of different color wire that you can use to create pathways to sensors, relays, or other devices.

Before we get into the details of this I/O box, let’s delve a little deeper into a few related items of interest. Any basic EFI ECU controls systems beyond just spark and fuel. The Holley HP and Terminator X's four inputs and outputs can be custom configured to the user’s needs. For outputs, one example might be control of a pair of electric fans where all you have to do is tell the ECU at what temperature the fans should turn on and off. Other external controls can be aimed at something fun like control over nitrous solenoids.

But once you become familiar with these systems, motorsports enthusiasts have discovered there are several other outputs that might be worthwhile additions to the race car. We’ve listed a few of these in the accompanying I/O chart so we won’t go over them here. There are enough of these useful outputs available that a Holley HP or Terminator X ECU does not have the capacity to control them all. That’s where Holley’s I/O Module comes into play.

Of course, outputs are only half the story. The other half encompasses the inputs. We can define inputs mainly as sensor information that can be added to the ECU to offer the racer or street enthusiast more information that can be used to fine tune the car for better performance. Again, we’ve come up with a list of inputs that can be used that can then be stored in the computer’s memory for use as data log reference information.

This Holley module is essentially a CAN bus device that accommodates a total of eight inputs and eight outputs that can be added to the HP or Terminator X ECU’s to expand their capability. CAN stands for Controller Area Network which is a circuitry used in computers to allow communication between devices either within the computer or with sensors outside the ECU.

While this is a new product, it does not require the latest software to allow it to operate. In fact, the module is completely compatible with all of Holley’s software right back to V2. This way, if you prefer an earlier version of the software you don’t have to upgrade just to use this new module.

Another interesting option that the I/O Module offers is that the Holley digital dash can be used to accomplish digital switching. Let’s say you’d prefer a virtual switch on the Holley LCD screen. This means after configuration, all you have to do is touch the screen to manually turn the fan on. This virtual or digital switch will then be connected to your I/O module that controls the fan.

Andy Starr 1956 Chevrolet

Among the places the Holley I/O Module could find itself useful are cars like Andy Starr’s 582ci big-block ’56 Chevy street/strip car. This Hilborn injected Rat uses a Holley HP ECU and Starr wants to expand with additional inputs that will help him improve the big-block’s e.t. and speed. Photo credit: Dave Milcarek Photography.

Andy Starr’s 582ci big-block Chevy-powered ’56 Chevy drag car uses a Holley HP-controller to run the EFI on his Hilborn-stacked Rat motor. Initially, it appeared the HP was the perfect choice and has worked flawlessly to control spark and fuel. But now with several Drag Week and other races as experience, Starr has maxed out the I/O capability of his HP ECU. This new I/O box offers a wealth of additional channels.

It has been said that there is no such thing as too much data. When it comes to controlling his ’56, Starr is discovering that the more data he can recover from each pass helps determine how to tune the car. While most guys with a low 9-second car would be running a TH400 or perhaps a ‘Glide, Starr has chosen the much more tortuous path of a G Force GF5R five-speed manual. One big challenge is making the clutch work, which is a big part of the need for additional data.

Andy Starr G-Force trans

Getting a 3,800-pound car launched with a manual transmission is not easy – nor is it easy on parts. The G-Force five speed uses a 3.17:1 First gear ratio to get the car moving and spins a 4.56:1 gear in the Moser fabricated 9-inch housing using Moser 40-spine axles.

With the existing inputs into his Holley HP maxed out with sensor data, Starr is now looking to add capacity with the I/O module. We’ve listed his current I/Os in a separate chart. His clutch release rev limiter data is actually used to limit rpm just before the clutch is released but does not require the driver to manually trigger a button like a two-step. Plus, his input rpm sensor allows him to log the difference between engine rpm and input shaft speed to determine the amount of clutch slippage on the starting line.

Starr told us his plans include adding the I/O module to free up a couple of the inputs from the HP like pan vacuum and redirect them to the I/O module. This will free up the data stream through the HP to allow a higher resolution sensor like the g-meter to be run by the HP box.

We won’t go into the details of navigating the I/O process but essentially you tell the module what sensor or output channel you intend to use and what kind of signal it will be processing. We’ve included a small chart taken directly from the Holley instruction manual that shows the different kinds of signals that can be processed. There are six different signals that can be configured to specific channels.

Each input channel on the module can be configured as one of the following types. This is consistent between all of Holley's ECUs.

Tags:tech, Holley EFI Tech, Holley EFI, HP EFI, Terminator X, Dominator ECU

Sours: https://www.holley.com/blog/post/how_to_add_additional_inputs_outputs_to_an_hp_terminator_x_or_dominator_ecu/

Holley EFI CAN Input/Output Module Kit 554-166

Warranty Information

All Holley Performance Products Limited Warranties are extended to the original consumer only. This Limited Warranty is not assignable or otherwise transferable. There are no warranties that extend beyond those stated herein. Holley Performance Products offers no other warranties expressed or implied beyond this Limited Warranty. In the event of an alleged defect in material or workmanship, Holley Performance Products responsibility is strictly limited to repair or replace the defective product. Holley has no other obligation expressed or implied. Final warranty determination will be in the sole discretion of Holley Performance Products. Holley shall not be responsible for; (a) actual or alleged labor, transportation, or other incidental charges; or (b) actual or alleged consequential or other damages incurred by use of any product of Holley Performance Products. To initiate the warranty process, the consumer must return the alleged defective product to the place of purchase with a dated receipt and completed applicable warranty claim tag. Warranty claims will be rejected if the date of purchase cannot be established by the consumer. Do not send products directly to Holley Performance Products. Holley Performance Products assumes no responsibility for products sent directly to Holley Performance Products. This Limited Warranty sets forth specific legal rights. The consumer may have other rights as a result of variations in state laws or provincial laws. This Limited Warranty supersedes all prior warranty statements. HOLLEY/FLOWTECH/HOOKER/NOS/WEIAND NEW PRODUCT Holley Performance Products warrants its new Holley, Flowtech, Hooker, NOS, and Weiand products to be free from defects in material and workmanship for a period of 90 days from date of purchase. Holley Performance Products Limited Warranty specifically does not apply to products, which have been (a) modified or altered in any way; (b) subjected to adverse conditions, such as misuse, neglect, accident, improper installation or adjustment, dirt or other contaminants, water, corrosion, or faulty repair; or (c) used in other than those applications recommended by Holley Performance Products. Holley Performance Products also does not warrant, and disclaims all liability for products used in racing activities and/or applications other than those specifically recommended in the current brand catalog. Holley limits the warranty on Metallic Ceramic Coatings to be free from defects in material and workmanship for a period of 90 days from the date of purchase. This limited coating warranty does not apply to any products which have been subjected to adverse conditions, such as high heat encountered during engine break-in or if used during any racing activity.

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Sours: https://www.lsxceleration.com/holley-efi-can-input-output-module-kit-554-166/
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Holley EFI CAN Input/Output Module Kit

The Holley EFI CAN Input/Output Module can be added to Holley EFI HP, Dominator, Terminator X and Terminator X Max EFI installation. This CAN module will add eight inputs and eight outputs to the system, which can be used to control additional accessories, or provide critical sensor inputs. This module is perfect for anyone wanting to enhance the capabilities of their current ECU, yet have already tapped out their ECU's Input/Output channels.


  • Quickly expand your HP/Terminator X or even Dominator ECU’s Input / Output control with 8 additional inputs and outputs
  • This module is perfect for anyone wanting their Holley EFI ECU to control more functions or monitor more data channels
  • HP and Terminator X EFI installations with only 4 inputs and 4 outputs can now add more functionality to their EFI system!
  • The 554-165 kits contain a pre-terminated CAN Harness, allowing you to quickly install the Holley EFI CAN Module to any existing Holley EFI installation.
  • Pre-Terminated flying leads makes installing new wires a breeze.
  • Inputs can be used for things such as:
  • -Switch 12v Toggle Switches - can be configured for external mechanical relays, or setup as digital switches via a Holley EFI dash
  • - Ground input for brake pedal switch
  • -5v analog inputs for sensors like fuel pressure, oil pressure, or nitrous bottle pressure
  • -Thermistor inputs for Coolant temperature sensors
  • Outputs can be used for things such as:
  • -Switch Low (Ground) – For relay control or activation
  • -Switch Low PWM (Ground) – -Switch Low PWM (Ground) – PWM Fan control – PWM Fuel Pump control - or other PWM- controlled devices.
  • Adjustable broadcast rate for each channel - from 0-100hz.

About Holley EFI

Holley is the new standard in EFI! Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever!

Sours: https://www.holley.com/products/fuel_systems/fuel_injection/modules_and_sensors/can_input_output_module/parts/554-165
Inputs and Outputs Overview with Holley Terminator X

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And outputs holley efi inputs

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Inputs and Outputs Overview with Holley Terminator X

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