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Holley EFI Technical Information

On this page we will post documents, notes and videos pertaining to the Holley EFI systems.

Obviously you will probably have questions, so don’t hesitate to call us at 209-247-6497

A surprise article showed up on the Hot Rod Magazine web site:

There is a lot going on with Holley EFI systems and software

Some of the links below are a download of a WORD document.

We did this so you would automatically have a document that you could print.

V6 Build 400 update for HP & Dominator ECUs
and Terminator-X V3

V6B300 DL-1
V6B300 DL setup-1

Datalog setup now show colors

Tune using Lambda if you want

Fuel Table
Target in Lambda

Axes are much easier to see

ADDITIONAL V6B300 IMPROVEMENTS  (Click here for a video)

• Color options for datalog screens

• Manually test outputs one at a time - Click here

• Easier to see and adjust table scales.

• Email Global File/Save to Desktop Options

• Additional Water meth control options

• Support for Holley Can I/0 module

• New supported injector options

• Automatically check for update option

• New drag race transmission control (dump valves, lockup control, etc.)

• New Nitrous control additions

• Support for Terminator X Stealth throttle body with Dominator ECU

Here is a link to a pretty good

Video about the Terminator - X line

Here is an Excel Spreadsheet

that compares the terminator-X line to the other Holley products

What? No Installation Instructions or Documentation?

All documentation is included within the software.  Install the appropriate software and go to Help.  All the information is there starting with the installation.


Helpful conversion:

I don't know how many times people have asked "what the hell is a kilopascal" in terms that they are used to thinking about.

Here's an easy way to interpret that axis. Since vertical axis is manifold vacuum and/or pressure (MAP), go to Toolbox/Preferences and click on Display MAP as PSI. Negative PSI is vacuum, positive PSI is ... PSI ... duh. To convert from a negative PSI to inches of vacuum just double the number. So -5 PSI on the scale is 10 inches of vacuum. Simple, right? If you are using a 1-Bar Map sensor the vacuum will go from 0 at the top to some level of maximum vacuum at the bottom such as -12. That is the same as no vacuum to 24" of vacuum.


Injector Types:

There are many different styles and types of fuel injectors but here's a picture of the basic normal vs stubby types. Note also that there are different connectors with the most common being EV1 and EV6. Also here is the injector offtime information for Holley injectors.

Holley Tech Products

IAC Wiring Considerations


Here's a drawing of the IAC wiring options. Customers buying the Holley EFI systems do not realize that Holley likes to use Chrysler IACs because they flow more air than a standard GM LS style.  If you are configuring a system that uses a "standard" GM IAC you will have to make a minor wiring change in order for the IAC to work.


To find out whcih type of IAC you have, look at the drawing below.

With an ohm meter measure between the center two pins (B and C) of your IAC.

If it’s an open – you have a GM style IAC.

If you see resistance you have a Chrysler style IAC

Here's the wiring for our AR403 B/RB cam sync sensors.

Our Cam Sync Sensor for big block Mopars (B or RB blocks)

Click HERE for more info


The sensor will work with any EFI system and is plug-and-play with Holley.

Crank and Cam Pigtail Harness 2
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