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Discussion Starter #1
Some good reading on basic DYNO Tuning:


•What is a Dyno Tune?
•What is horsepower, torque and air-fuel ratio?
•Does my bike need a dyno tune?
•What are the advantages of a dyno tune?
•Why is a custom map better than a map downloaded off of the internet?
•Why do different dynos show different horsepower numbers?
•Why are my exhaust pipes black if my bike is running correctly?

What is a dyno tune?
Simply put, a dyno tune is making adjustments to your bikes ignition, fuel and air supply, to achieve the most possible horse power and torque, while maintaining optimal air fuel ratio. To do this you use a state of the art Dyno Jet.

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.

Why do different dynos show different horsepower numbers?
Every Dyno reads a little different, different brands read differently. Temperature, altitde, 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.

1,688 Posts
I haven't read the links yet, but the text in the OP will be helpful to alot of members.

I ran leaded gas on my last trackday just to see the color of the exhaust tip.:mrgreen: Expensive, but I'm running an ECU that wasn't programmed for my bike. It baffled my riding partners, but a little knowledge goes a long way...:wink:
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