Comparison

123\Tune+ vs Garrett Motion G

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

123\Tune+

Control your classic car's ignition wirelessly via Bluetooth. Adjust advance and vacuum curves, monitor real-time engine data, and utilize features like a PIN-code immobilizer and rev limiter. Compatible with a wide range of classic vehicles.

Highlights
  • Wireless ignition curve adjustment
  • Real-time engine data monitoring
  • PIN-code immobilizer
  • Soft rev limiter
  • Tune mode for timing tests
  • MAP/boost sensor support
Features
Read full description

Take full control of your classic car’s ignition with the 123\Tune+ app and distributor. Wirelessly adjust and upload custom advance and vacuum curves via Bluetooth. Monitor real-time engine data including RPM, battery voltage, distributor temperature, MAP pressure, ignition advance, and GPS speed. The 123\Tune+ offers advanced features like a PIN-code immobilizer for theft protection, a soft rev limiter, and a unique "Tune" mode for testing ignition timing impact on acceleration between two RPM points. Compatible with both 6V and 12V systems, CW and CCW rotation, and equipped with a MAP/boost sensor. Works with a wide range of classic vehicles — from Alfa Romeo and Jaguar to Volkswagen and Volvo. Visit 123ignition.com for supported models and more details.

About

Garrett Motion G

This free tool connects to a Bluetooth module to display turbo speed and boost pressure data on your mobile device. Optimize turbocharger durability and performance by monitoring operating RPMs and calculating turbo efficiency.

Highlights
  • Display turbo speed and boost pressure
  • Optimize turbocharger durability and performance
  • Calculate turbo efficiency
  • Gauge and graph data formats
  • 120-second live data plot
  • Easy installation and setup
Features
Read full description

The Garrett G-Smart mobile app is a free tool that allows the G-Smart Bluetooth module to convert Turbo Speed and Boost Pressure signals into wireless Bluetooth data for display on a mobile device. This important data will allow enthusiasts to see if they are operating the turbocharger within its recommended RPM limits to optimize durability and performance. Turbo efficiency and corrected air flow can be calculated when manifold absolute pressure (MAP) is known and this can help identify proper turbo selection. Kit Selection: Purchase of a Garrett G-Smart module is required to make this this mobile device application function. Garrett offers G-Smart kits with G-Series (flange style) and GTX (threaded) speed sensors. All kits include a wiring harness and Bluetooth module, with the option to purchase with or without a speed sensor (for enthusiasts with existing speed sensors). PN: 923586-0003 G-Smart Kit with Flange Speed Sensor (G-Series Models 25 30 35 40 42 45 47 50 55 57 | GTX Gen II Models 47 50 55) PN: 923586-0001 G-Smart Kit without Speed Sensor (Use if you have an existing speed sensor) PN: 923586-0002 G-Smart Kit with Threaded Speed Sensor (GTX Gen II Models 28 30 35 ) *For all other models without an existing speed sensor port including GT, GTX Gen I, GBC, GTW, a speed sensor port can be machined into the compressor housing to accept the threaded style speed sensor and G-Smart kit. Speed Sensor Installation Instructions: Please review the speed sensor installation instructions before installing any speed sensor. https://bit.ly/3rxBHjG Please review your turbocharger compressor housing before purchasing the G-Smart Module. If you have questions about selecting the correct kit, please contact your Garrett Distributor. Easy to Install and Setup The Garrett G-Smart Bluetooth module is easy to install and configure. Bluetooth functionality means no wires through the firewall for a quick, and clean installation. The plug-and-play harness accepts Garrett flange and threaded style speed sensors. A 12V switched power and sufficient ground connection are all you need to get started. The Sensor Setup menu is loaded with existing Garrett Turbocharger part numbers, models, compressor wheel blade counts and top-rated turbo speeds. Custom configurations can also be created for Garrett models without speed sensor ports or for non-Garrett turbochargers that utilize the same style speed sensors. Analyze Turbo Speed and Boost Pressure With the device paired and the car running, the mobile device screen will display turbo speed and boost pressure (if connected) in gauge and graph format. The gauge display features a constant live data feed and has a marker that freezes on peak turbo speed. The graph plot length axis can display up to 120 seconds of live data. The live data feed can be paused by pressing the pause button on the screen. This allows you to review data points within the plot length by touch and scroll within the graph. Data older than 120 seconds cannot be recalled. Review Performance Data The analysis of this important data will allow enthusiasts to see if they are operating the turbocharger within its recommended RPM limits to optimize durability and turbo performance. Turbo efficiency and corrected air flow can be calculated when manifold absolute pressure (MAP) is known and this can help identify proper turbo selection. WARNING The use of any turbocharger product above maximum turbocharger speed is at the owner’s risk and can result in damage and premature failure. To protect the turbocharger from overspeed when operating, a speed sensor can be installed into the compressor housing to monitor shaft speed.

Screenshots

123\Tune+4 screens
Garrett Motion G4 screens

Verdict

The call

The clearest difference is rating: Garrett Motion G at 5.0 against 123\Tune+'s 4.5. 123\Tune+'s advantage is update cadence (every 3 weeks vs every 4 months) and ratings volume (242 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Garrett Motion G holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: 123\Tune+ has 242 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

123\Tune+ ships an update every 3 weeks, Garrett Motion G every 4 months. The most recent releases landed on October 16, 2026 and September 24, 2026 respectively.

Scorecard3 real differences · 7 level
123\Tune+ versus Garrett Motion G: the parameters behind the verdict, then further details
Parameter123\Tune+Garrett Motion G
PriceFreeFree
Rating4.5 (242 ratings)5.0 (1 ratings) — better
Positive reviews57.7% of reviews—
Number of ratings242 — better1
Update frequencyEvery 3 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.015.0 — better
Further details — not scored
Size209 MB6 MB
Age rating4+4+
DeveloperAlbertronic B.V.Performance Electronics

Customer experience

123\Tune+

All ratings242 ratings
Positive87.6%
Neutral2.9%
Negative9.5%
Written reviews26 reviews
Positive57.7%
Neutral7.7%
Negative34.6%

Garrett Motion G

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

123\Tune+

No in-app purchases

None

Garrett Motion G

No in-app purchases

Questions

Is 123\Tune+ free?
123\Tune+ is free to download, with no in-app purchases.
Is Garrett Motion G free?
Garrett Motion G is free to download, with no in-app purchases.
Which has better reviews, 123\Tune+ or Garrett Motion G?
Garrett Motion G is rated higher. 123\Tune+ averages 4.5 out of 5 from 242 ratings, while Garrett Motion G averages 5.0 from 1 ratings.
Do 123\Tune+ or Garrett Motion G have ads?
Neither 123\Tune+ nor Garrett Motion G shows ads.
Which is updated more often, 123\Tune+ or Garrett Motion G?
123\Tune+ ships an update every 3 weeks, and Garrett Motion G every 4 months. Most recently, 123\Tune+ was updated on October 16, 2026 and Garrett Motion G on September 24, 2026.

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