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DEFINITION: A dynamometer (Dyno) is a machine used for measuring the Torque and Power or a Motorcycle while also monitoring the Air Fuel Ratio. It is used to assess a vehicle’s state of tune by placing the vehicle under different loads and acceleration rates, measuring the results and making appropriate modifications/changes to the tune of the Motorcycle.
Based on dyno metrics, it is estimated that 75 percent of Harley-Davidsons on the road are running 10 to 50 percent below potential. If you have installed any aftermarket items like an exhaust or air filter these changes can alter your AFR. This can result in a motorcycle that is not making the optimum power and in extreme circumstances it can lead to dangerously lean conditions which can cause engine damage. You should have your Motorcycle ECU tuned to suit the modification.
We have the latest dyno technology with the Dynojet™ Motorcycle Chassis Dynamometer Model 250i. This piece of equipment has the repeatability and reliability of an inertia dyno with the additional benefits of Eddy Current Load Control technology. This dyno allows us to perform several types of tests, including basic horsepower/torque tests, real-time diagnostics and tuning, EFI calibration, and more. Horsepower is calculated by deriving force through multiplying drum acceleration by drum mass and velocity by the time it takes to rotate the inertia drum one turn. Torque is figured by multiplying the measured force at any given moment by the drum radius, proportioned by the ratio of the engine to drum speed. The Dynojet uses horsepower and torque readings every 200 rpm. Inertia dynamometers necessitate that the tuner sits on the motorcycle during operation. Results are most consistent if the bike is measured by performing a roll-on test in the upper gears.
We will respect your bike as if it is our own. We take great care in preparing the bike for testing. We measure AIR Fuel Ratio (Air Fuel Ratio) through the normal range of RPM. This allows us to adjust the AFR parameters thru the normal riding spectrum. We will not rev the bike past the point where it is producing horsepower. There is no point in staying on the throttle when the bike stops producing horsepower. We monitor the bike’s performance very closely to not abuse the engine in regard to excessive RPM.
There are differences in each motorcycle, even motorcycles from the same make and model and year. The differences are due to tolerances during the build of the motor and during the manufacturing. Maps downloaded off the internet are designed to get you close for your bikes modifications, but that doesn’t take into consideration local fuel, altitude, ambient temperature, humidity, location, or the differences between each bike, sometimes these maps can result in your motorcycle running worse. By tuning the air/fuel ratio, ignition timing and electronic throttle valve (ETV) for your specific motorcycle, you can get the best power and rideability for your individual bike.
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