• What is a Dyno Tuner?

  • A Dynamometer (commonly called a "Dyno") is a machine that measures engine output - horsepower, torque and air-fuel mixture. It can test under different engine loads and conditions. This allows the technician to adjust the air-fuel mixture and timing to optimum settings for a given motor and riding style.

  • Why should I get my bike Dyno-Tuned?

  • If you have performance work done to your bike, you should have your engine tuned to get optimum performance without sacrificing drivability or fuel economy.

  • How can it increase my motorcycle's performance?

  • By using the best settings exactly matched to the equipment on your motorcycle, you will get the best possible performance. Note that "performance" includes not only the maximum power, but also good drivability, a smooth (and cooler) running engine, and good fuel economy.

  • What does it do for my horse power?

  • There is a lot more to tuning than just getting maximum horsepower. That's the easy part. A properly tuned bike should still get nearly as good fuel economy as stock (sometimes better!). It should also have good drivability with no hesitation or "flat spots" and little or no backfire or misfire.

  • How can it save me from costly repairs in the future?

  • A properly tuned engine does not have to work as hard as a poorly tuned engine to do the same job (i.e. normal riding, such as cruising on the highway) resulting in less wear and tear. Your properly tuned engine runs cooler and more efficiently, therefore, the “life” of the engine is extended.

  • What kinds of bikes can be Dyno-Tuned?

  • All bikes can be tuned. We specialize in Harley-Davidson®, but if you have a different American V-Twin brand talk to us and we may be able to help you. Unfortunately, we are not equipped to tune trikes or any bikes configured with more than 2 wheels.

  • Are there requirements my motorcycle must meet to be Dyno-Tuned?

  • Your bike should be in good condition before running on the dynamometer. If your tires, belt, or other components are in poor condition they may fail; after all we will be testing at maximum output

  • Who is authorized to run the Dyno-Tuner?

  • Only our specially trained technician is authorized to run the dynamometer. Mikey has been tuning bikes for decades and he is also a HD mechanic, so he understands how modifications affect your bikes performance and how to adjust your tune to get the best performance results for your riding style.

  • What time of year can it be done? Are there temperature or weather restrictions?

  • Fuel-injected motorcycles can be tuned any time of the year and in any weather. Our state-of-the-art dynamometer has a special room all to itself. Carbureted motorcycles should only be tuned in moderate conditions. Extreme temperatures can affect the results.

  • How much does it cost?

  • The cost is dependent on the time it would take to tune the motorcycle. Fuel-injected motorcycles typically take 6-8 hours. Additional costs depend on the amount of mods done to the bike – as you modify the bike further it becomes more difficult and/or time consuming to properly tune the bike. Carburetored motorcycles typically take two hours, due to the fact that there are fewer adjustments that can be made on carburetor engines. There are also additional costs for a tuning device (or a tuning license) for Fuel-injected bikes.

  • How long does it take to Dyno-Tune a motorcycle?

  • The time it takes depends on the motorcycle. Very radical engine builds may take longer than a mild engine. We charge according to the modifications done to the engine (StageI, Stage II, etc.) for normally aspirated fuel-injected Harley-Davidson® motorcycles (three hours of service labor max for normal carbureted HD bikes). For brands other than Harley-Davidson®, we ask that you stop by or call and talk to one of our Service Specialists or to Mikey, our Dyno-Tech.

  • What's the difference between a downloaded map and a Dyno-tune?

    Downloaded “maps” are made to fit a specific bike (year & model) with specific performance modifications. In order to develop that “map” they used a specific bike with specific components and tuned it under specific circumstances. If your bike does not “exactly match” the downloaded maps specs (which most of the time is very difficult to do because there are simply too many performance components out in the market), then the results will most likely be less than optimal. A Dyno-tune takes your bike with its new modifications and tunes it to work optimally for all parameters and load conditions.

  • What are the different software options for Dyno-Tuners?

  • The dynamometer has its own software to control load, tuning options, collect data, etc. At Performance Choppers we use a DynoJet 250i Dynamometer with DynoWare RT electronics and the latest PowerCore software. Each brand of Tuner has its own software that we use in conjunction with the Dyno in order to tune each bike.

  • What does Performance Choppers prefer?

  • For fuel-injected Harley-Davidson® motorcycles, we prefer the DynoJet Power Vision Tuner, The TTS MaterTune, or the Screamin' Eagle® Super Tuner or Race Tuner. These tuners provide more options and do not add more modules to the motorcycle. from Harley

  • What's this I hear about different types of tuning devices?-Davidson®, provide more options and do not add more modules to the motorcycle

  • There are three basic types of tuning devices for tuning fuel-injected Harley-Davidson® motorcycles.

The first type is a "fueler", which plugs in between the wiring harness and the fuel injectors. It has a few switches or controls, and adds or subtracts fuel in a few areas. The capabilities of this type of tuner are very limited, allowing adjustments to fuel only and only in a few areas.

Advantages: Price
Disadvantages: Poor results, and it adds extraneous hardware to the bike."Fuelers" attempt to turn a very sophisticated computer program into a 3-circuit carburetor. Not Recommended.


The second, and probably most common type, is a "piggyback" device that plugs in between the wiring harness and the Electronic Control Module (ECM). It intercepts and modifies signals between the engine and the ECM. This type has more capabilities than the first, allowing adjustment to both fuel and ignition tuning.

Advantages: Can adjust more parameters than the first type.
Disadvantages: Adds extraneous hardware to the bike. "Piggy-backs" attempt to put the bike's fueling parameters back into the original program, which may not be optimal for all performance levels. It is more of a correction device than a tuning device.


The third type, a "Flash Tuner" does not add any extra modules. It loads a new "map" into the existing ECM.

Advantages: Can adjust a lot more parameters than the other two types, and no extra hardware is added to the bike. "Flash Tuners" allow direct access to the program that actually runs the bike.
Disadvantages: Initial purchase price – although, with the recent advent of “licensed” software instead of a physical tuner, price is equal to, or even less than the price of many “piggyback” type devices.


  • Why is adding additional hardware to the bike a disadvantage?

  • There is very limited space on a motorcycle to add any extra hardware. They often do not fit comfortably, which often causes stress on the electrical connectors resulting in poor connections. Also, there is sometimes pressure on the extra module or hardware, which may result in failure. Whereas, actual ECM failures are extremely rare.

  • How should I choose a shop to tune my motorcycle?

  • We suggest that you read the information we have provided on this site. We want you to be well informed. Ask questions to those who will be doing the tuning, weigh your options, then make your decision.

  • I want to use a different tuning product than the one you recommend. Will you still tune my bike?

  • No. We pride ourselves on delivering a product we can be both proud of and confident in that it will perform to your expectations. Using “piggy back” or “fueler” type tuning devices produces a less than optimum tune for your bike and we are not willing to compromise. We want you to be happy with the results, so anything that's going to leave you wishing you had gone with a full tune is not an option for us.

  • Is there a difference between tuning a fuel-injected motorcycle and a carbureted motorcycle?

  • There are fewer adjustments that can be made to carbureted motorcycles.

  • Is there a difference between tuning a Harley-Davidson® motorcycle and a non Harley-Davidson® motorcycle do you tune any type of motorcycle?

  • We use the appropriate tuning products and software to tune Harley-Davidson motorcycles (and all caburated American V-Twins). Please give us a call to get more information on tuning any other types of American V-Twin motorcycles.