Holley Terminator X

Holley Terminator X

Bluetooth App for Terminator X

5 ratings
3 reviews
Free

Details

  • Released
  • Updated
  • June 25, 2025
  • April 16, 2026
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iphone
ipad
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About

Unlock advanced vehicle tuning control with this app. Fine-tune over 250 engine parameters for maximum performance using a mobile-friendly interface. Monitor vital engine data, create custom tunes, and share tuning files effortlessly.

250+ customizable engine parameters
Real-time engine data monitoring
Intuitive setup wizard for base tunes
Create, manage, and share tuning files
Record and share datalogs
Step-by-step TPS setup
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What's New in Holley Terminator X

1.0.10

April 16, 2026

New Dash Layouts Fixed bug with iPad File sharing Various other minor bug fixes

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User reviews

Needs CarPlay

Great app. If it had CarPlay it would be perfect.

Great app but should support car play

The feature set available is great and vey useful. But if this could be a CarPlay app it would get 5stars

Good but limited

So, first, when you install the module and turn on your car, it makes you dump the existing tune—so, if you’ve spent a bunch of time on the PC tweaking the settings, I/Os, or anything, that all goes away.

With my install (Factory Five Cobra w/ G2 Coyote) I have a check engine light wired for output 2, and my fan set at output 4–they were working with my old map.

Unfortunately, it’s only letting me set the fan output but not letting me set the CEL output. So, I’m sure I’ll be spending some quality time with tech support.

I also have the Terminator driving my tach, which isn’t working now. So, I’ll need to figure that out too.

I’m sure there’s ways to make all this work, and with a brand new app, you expect some room for improvement.

I would love to see the app modified to download the existing map to continue working from. For everyone with an existing functioning tune, it’s crazy to force the deletion of it just to use this module.

Aside from this gripe, it’s a really cool setup and using an iPad to tune/program is so much more convenient than using the tiny wired touchscreen that you have to use the stylus with.

Once we see some app updates, I expect it will get better.
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Developer apps

FAQ

What is Holley Terminator X?

Holley Terminator X is a mobile application designed to provide advanced tuning control for vehicles equipped with Holley's Terminator X EFI systems. It allows users to fine-tune over 250 engine parameters directly from their iPhone or iPad.

What are the key features of Holley Terminator X?

Key features include real-time engine data monitoring on six pre-defined screens, an intuitive setup wizard for creating base tunes, the ability to create, manage, and share tuning files, and datalog recording for performance review.

What devices is Holley Terminator X compatible with?

Holley Terminator X is compatible with iPhone, iPad, and iPod devices. It requires the Holley Bluetooth Module to connect to the Terminator X ECU.

How often is Holley Terminator X updated?

The latest version of Holley Terminator X is 1.0.4, which was last updated on November 12, 2025. Updates are released periodically to improve functionality and add new features.

What is the age rating for Holley Terminator X?

Holley Terminator X has an age rating of 4+, making it suitable for a wide range of users. The app focuses on technical vehicle tuning functionalities.

Does Holley Terminator X require a subscription?

No, Holley Terminator X is available for free. There are no subscription fees or in-app purchases required to use its core tuning and monitoring features.

How does Holley Terminator X compare to laptop tuning software?

Holley Terminator X offers the convenience of mobile tuning, eliminating the need for a laptop. It provides essential real-time gauges and tuning capabilities in a streamlined interface for on-the-go adjustments.

What user sentiment is associated with Holley Terminator X?

Based on available data, Holley Terminator X has a high rating of 4.5 stars from 4 ratings, indicating positive user sentiment regarding its performance and utility for vehicle tuning.