The Harley 103 is one of the best selling bikes and is known for its speed and design; buying a tuner for such a bike is very hard as there are tons of factors to consider. That’s why here is our list for the best tuners to upgrade your Harley 103’s performance

Best Fuel Grades Tuner For Harley 103 Reviewed

Dynojet Power Commander
  • Dimensions – 14 x 11 x 4 inches
  •  Item weight – 1.4 pounds
  •  Best for overall

  • Monitors air/fuel mixture for best performance
  •  Custom made for Harley Davidson bikes
  • A little tough to install

The Dynojet plugs directly into the Power Commander V with a single cable; it Includes 18mm O2 sensors and a power connector that plugs into the bike’s harness to make automatic fuel adjustments. 

The user can specify what air/fuel ratio to make each rpm and throttle position % combination.

This also Makes it possible to adjust cruise for best fuel economy as well as larger throttle openings for peak power.

No matter what modifications you’ve made or the elevation you ride in, the AutoTune Module is the accessory that brings it all together. 

Made especially for Harley-Davidson motorcycles, this connects to the bike’s diagnostic port through a 6-pin connector. 

This module is designed to be used .with the Power Commander V fuel tuner for your Harley.

Once installed, the AutoTune kit monitors the air/fuel ratio. It then sends this information to the Power Commander V and automatically corrects it as you ride, letting you feel the changes as they happen. 

Dynojet Power Commander V 15-004
  • Dimensions – 5*4*2 inches
  • Item weight – 1.15 lbs
  •  Best for ignition control

  •  It helps load custom maps into the system
  •  Provides control over ignition timings
  • It does not increase the power or torque of the engine

The Auto Tune kit monitors the fuel mixture (by installing the included Wide Band O2 sensors in the exhaust). It then sends this information to the Power Commander V and automatically corrects it while you ride. 

You can also ask the company to send you a custom made map for your vehicle detailing every aspect which is further compatible with the tuner.

The Power Commander V is loaded with tons of new features including Reduced size from PCIIIusb, USB powered computer,  2 position map switching functions and volt sensor.

With this tuner, you can gain control over both fuel delivery and timing, making it a great product to control your ignition timings.

This Power Commander V is available for select twin cylinder engines and retains all of the standard Power Commander V fuel control features, which allows for +/- 20 degrees of timing adjustment, map switch input and adjusting cylinder timings.

Thunder Heart ECMs
  • Dimensions – 11 x 3 x 3 inches
  • Item weight – 1.6 ounces
  • Best for auto-tuning

  • Help auto-tune the bike without having to do much work
  •  Records data logs to study the performance of the engine
  • Extremely expensive fuel

ThunderMax ECM with Auto-Tune module mounts conveniently in place of the factory ECM and plugs into the existing harness.

It utilises wideband O2 sensors and works as a closed-loop control system to continuously self-adjust and correctly tune the motorcycles air/fuel ratio for all riding conditions.

The tuner includes ThunderMax ECM with Auto-Tune Module, plug-in harness and two wide-band sensors, TMax software and communication USB cable, Quick-Start Easy Install and Comprehensive Users Manual, technical support and free software and updates.

The rider can adjust idle speed, rev limit, speedometer calibration, and adjust front and rear cylinders for different ignition spark timings with this tuner.

The Software program allows live monitoring, recording and examination of diagnostic codes and data logs, including a number of starts, engine temperature and rpm operation.

Vance & Hines Fuelpak FP3
  • Dimensoins – 5 x 3 x 2 inches
  • Item weight – 4.8 ounces
  •  Best for fuel management

  • Provides top-notch fuel management
  • Measures and records performance of the vehicle
  • Excesses features may be tough to use

The Vance & Hines Fuelpak FP3 revolutionises fuel management for Harley-Davidson motorcycles using the HD-LAN 6 pin system.

Connecting wirelessly by Bluetooth to iPhone or Android Smartphones, Fuelpak FP3 uses Flash technology to recalibrate engine parameters and mapping for exhaust systems and other performance upgrades downloaded from the expansive library of calibrations developed by Vance & Hines. 

Also standard for the Fuelpak FP3 is an Autotune feature, using all factory sensors to add another layer of precision tuning for specific requirements, whether tuning for unique components or different grades of fuel. 

With this tuner, Live Sensor Data can be viewed through the smartphone to display speed, RPM, cylinder head temperature, voltage, gear selection, and other vital information.

This tuner is also highly compatible with all Harley products and has their official approval.

Vance & Hines Fuelpak 61001A
  • Dimensoins – 8.9 x 6.2 x 2.9 inches
  •  Item weight – 1.4 pounds
  • Best fuel injectors

  •  A good beginner tuner due to simple use
  •  Fairly priced and affordable
  • It does not provide advanced tuner features

The Vance & Hines Fuelpak tuner system is based on the throttle position sensor, which simplifies the process of fuel injection tuning by reducing the decision load on the engine.

The best feature of this tuner is that it gives you an optimum fuel/air fixture; usually, vehicles run at an air/fuel ratio of about 12:1, but with the help of this tuner, you can reach the optimum ratio of 15:1. 

The tuner is also very easy to use and requires absolutely no software for its functions, thus making it simple to install and use.

The challenging part of installing this tuner is finding a place to mount it, especially on older model softails. 

Luckily they provided a deeper ECM tray to mount the tuner.

With this tuner, the bike runs strong and fast from the fuel pack and I would recommend this product as it’s cheap and easy to use.

Cobra Fi2000R O2
  •  Dimensoins – 7.5 x 6 x 3 inches
  •  Item weight – 10.6 ounces
  • Best for maximum power

Artı Yönleri
  • Maximises potential for power within the engine
  •  Easy to use and install
Eksi Yönleri
  • Focus only on fuel and power settings

Nearly every fuel-injected motorcycle can benefit from the installation of the Cobra Fi2000R. Current motorcycle engines utilizing oxygen sensors and closed-loop technology have very lean air/fuel mixture settings from the factory. 

These settings can limit the power and make the engines run hotter than earlier model-year units. The Fi2000R O2 accurately adjusts the fuel-injected engines air/fuel ratio. 

When your engine has the proper air/fuel ratio metered to it, it can perform to its full potential, run cooler and be a much more satisfying ride. 

The Fi2000R O2 is designed to work with all exhaust systems equipped with oxygen sensors (stock or aftermarket) and requires no additional Dyno testing or mapping. 

It arrives pre-configured from the factory for your bike and has no confusing computer programmes and software to install.

Dynojet Black Power Vision Tuner PV-2B
  • Dimensions – 1 x 1 x 1 inches
  •  Item weight – 1.1 pounds
  • Best tuner features

Artı Yönleri
  • Unique autotune capability that creates a custom tune just for your riding style.
  • Weather-resistant and shock-resistant
Eksi Yönleri
  • The tuner is slightly difficult to use when using advanced features.

The Power Vision device holds multiple tunes at once and allows you to optimise fuel efficiency, power, speed and torque.

The Power Vision device for Harley-Davidson even has a unique autotune capability that can monitor the way you ride and create a custom tune suited just for your riding style. 

After you’ve flashed your ECU, you can head out with Power Vision attached as an extra instrument panel. Power Vision easily connects through the OEM-style connectors so that installation won’t keep you away from the road for long. 

When you’re back in the garage, your data can then be seen using our Power Core software to help you improve your tune. 

The easy-to-read high-contrast screen gives you a complete view of how you tune your ride and comes with a variety of features to use.

Vance & Hines Fuelpak FP3  6-Pin
  • Dimensoins – 5.2 x 5 x 1.7 inches
  • Item weight – 6.4 ounces
  • Best for performance reviews

Artı Yönleri
  • Real-time tracking of performance
  • Access to thousands of dyno-tuned maps
Eksi Yönleri
  • The product is a little expensive

The Fuelpak FP3 is one of the best-selling ECU tuners in the world for Harley-Davidson motorcycles because it is the most intuitive tool on the market.

It gives you the power to control every aspect of your motorcycle’s tune, views live sensor data, calibrate your speedometer, read and clear trouble codes.

With this, you can also utilize a live sensor data display and receive best in industry support from the company’s FP3 technicians, all from your smartphone. 

The Fuelpak FP3 also backs up your OEM calibration and gives you access to Vance & Hines’ library of thousands of dyno-tuned maps.

The ability to read and diagnose trouble codes, as well as the ability to view live sensor data in real-time will allow you to keep a finger on the pulse of your machine.

Factors To Consider Before Buying Tuners For Harley 103

Effect On Engine

Tuners are primarily used for upgrading your engine to achieve maximum performance, but not every tuner will have the same effect on the engine.

Some tuners will enhance your overall power, while some may help achieve a better fuel balance; choosing what you want is an essential part of buying tuners.

Amongst our products, Dynojet Power Commander provides the best effects to the engine.

Tuners are often very expensive, some costing upwards of 300 dollars, so you need to choose one which gives you the best performance for the said price range.

Value For Money

You wouldn’t want to spend hundreds of dollars for a tuner with features you would never use, so keep that in mind before buying a tuner for your Harley 103.

Amongst our products, Vance & Hines Fuelpak 61001A has the best price.

Driving Conditions

Another critical factor is the conditions in which you plan on using the tuner.

You wouldn’t want to use a recommended tuner for extreme torque and speed in a city because that would render the tuner practically useless.

That’s why you need to buy a tuner that suits your driving conditions and will complement your vehicle.

Amongst our products, Dynojet Black Power Vision Tuner PV-2B is suited for all driving conditions.

Our Pick For The Best Tuner For Harley 103

Dynojet Power Commander is the obvious choice as it is custom made for Harleys and provides the best performance enhancements to the engine.

Although it is a little expensive, it is still the best choice for your Harley with its varying and easy to use features.

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