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Why Dyno tune your bike?


Jupiter Cycle has the top of the line, Dynojet Dynamometer utilizing the latest WinPep8 and Dynoware Rt software. We are a certified tuning center for Dynojet and have the state-of-the-art, exclusive Data Link Program from Dynojet. This program writes the map in real time as your bike is being run and put under load. You spend a little more up front but the result is a bike that runs at its peak for the options you have installed and that your air-fuel ratio is as close to optimal as it can be for the selected components you have chosen.


Dyno Tuning: "Feel the Difference"—Therapy for your motorcycle!
Today's Dynojet Dynamometer does so much more than tell horsepower and torque. It can look into your motorcycle and see things like fuel mixture, cam timing, clutch slippage, how loose or tight your drive chain is and whether or not it needs to be replaced, how your sprockets are holding up, whether your cush drive is worn, if your fuel needle needs to be adjusted, if your bike needs a tune-up, a valve adjustment, even if your speedo or your tach are calibrated properly. All this is only the beginning. 


A Dyno can show you different scenarios of what your bike would be like with different bolt-on accessories like a pipe and jet kit, different cams, a sprocket change, or another cam timing setting, etc. Thinking of getting a certain pipe or jet kit combination or accessory? The Dyno will show you the best way to go. It plays no favorites. It simply shows you who's product works and who's doesn't. The Dyno will show you exactly what you are going to get for your money before you even spend a dime. You can be confident that, with a Dyno, you not only get what you're paying for, but that the job was done right. Since the coming of the Dyno age, all those gray areas in the performance and accessory end of the motorcycle industry have become pretty black and white.


The dynamometer has also made a huge impact on the racing industry. Most racing teams use a dynamometer to tune their bikes. These days, you are at a disadvantage if you frequent a shop that does not have a Dyno. It has become the industry standard and a shop without one simply cannot provide the state-of-the-art technology and service that a shop with one can. Fifteen minutes in a Dyno can give you more information on your bike than five mechanics locked in a room for a weekend with it can. Just let us prove it.


Information About Dyno Tunes

What is a Dyno tune?
Simply put, a Dyno tune makes adjustments to your bike's ignition, and fuel and air supply to achieve the most possible horse power and torque, while maintaining optimal air-fuel ratio. To do this we use our state-of-the-art Dyno Jet dynamometer.


What is horsepower and torque and air-fuel ratio?

Horsepower is top speed and torque is what gets us there. Air-fuel ratio is how much air and fuel are mixing and entering the combustion chamber. This is how rich or lean the motor is running. Either end of the scale will cost you power, torque, economy, and efficiency. If you get the balance too far out on the lean side, damage can be done to the motor. If you get unbalanced to the rich side, you can foul spark plugs, dilute your oil with gasoline, and generally cause a noticeable reduction in performance.


All motors produced today that are in legal production have to meet federal EPA requirements and are generally on the lean side of the scale. Changing exhaust systems, mufflers, air filters, carburetors, and sometimes even spark plugs affect the way a motor performs. While making these changes may seem like the thing to do, one can end up with problems if these are not done properly.


How do I know if I need a Dyno tune?

For the most part any motor that has had changes made to the air filter system, muffler and/or exhaust headers most likely will need to be tuned for the components added or changed. It makes no difference if your bike is normally aspirated or injected. Both can be Dyno tuned. 


What options are there for my injected bike?

There are a few of options available for your motorcycle: 


  • Power Commander 

  • Bazzaz ZFi

  • Cobra Fuel Processor

  • Screamin’ Eagle Race Tuner 

  • Techno Research Direct Link

  • TTS MasterTune

  • FT Ecu

  • Woolich


Some Metric bikes/sport bikes are limited to the Power Commander.


The Power Commander is a separate unit that is placed in line between the bike’s wire harness and the on-board ECM. This unit tells the original ECM what changes to make in fuel supple, timing, etc., to achieve the desired and expected results. It acts like an interpreter from one language to another. This actually works very well while leaving the factory ECM unchanged.


The second option is an ECU Tuner. This is a program that connects your bike to the computer with an interface, called a key. This key is married to your bike only, and cannot be used on any other bike. This key is the only access you have to your ECM for mapping. This program actually re-maps the factory ECM. This is a good option for a Harley with space problems under the seat. This option is the most costly and takes the most time.


Why is a custom map better than a map downloaded off of the Internet?

There are differences in each motorcycle, even between the same make and model side by side. Maps downloaded off the Internet, or installed in a new piece of performance hardware are designed to get you close for your bikes modifications, but that doesn't take into consideration altitude, ambient temperature, humidity, location, or the differences between each bike. By setting the air-fuel ratio for your specific motorcycle, we can get all your bike has to offer in drivability AND horsepower.


Why do different Dynos show different horsepower numbers?

Every Dyno reads a little different, different brands read differently. Temperature, altitude, and humidity can all play a role as well as software differences from Dyno to Dyno. The only thing to really worry about is the A to B changes on the same bike, same Dyno, same day.


Why are my pipes always black if the bike is not running rich?

When lead was in our gasoline, you could read the mixture by looking at the spark plugs and the exhaust pipe for the rich tan color that spelled a good running motor. Today there is no lead in gasoline so all we have coming out the pipe that deposits is carbon. Carbon is black and builds up like soot on the exhaust pipe causing one to think their bike is running rich when in fact, it may be running lean.


Legal Note: 
Any performance items you add to your bike will change the emissions from your motor. This may or may not be legal depending on the state you operate your motorcycle in. Any Harley-Davidson® crossed flag performance parts you install on your Harley-Davidson® or Buell may affect your warranty.

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