2617 N. Fowler Ave, Fresno CA 93727

Phone (559) 292-3800   Fax (559) 292-4900

Fixed Speed Mode (F3)

In this mode, you select a specific RPM point where you want to hold the vehicle. The Dynapack will continuously vary the load to hold the RPM at that point within one RPM at the axle. As long as you are above the minimum throttle setting that is required to achieve that RPM, you can apply as much throttle as you want and the RPM will not rise above that point - all the way up to the full maximum rated torque capacity of the dyno. The dyno will then display the real-time torque and horsepower being absorbed, as well as other real-time relative data. 

The dyno also displays the relative power level in a continuously moving window known as the Relative Power Screen. (An older but similar version of this screen is shown below).

This display features a green tracer line that moves on a graph. The graph also has a red tracer or “tell tale” line that shows the maximum power achieved at that setting. You can then make any changes you like while the engine is running at the same RPM while you see the relative gains or losses in real time. For example, lets say you want to adjust the fuel mixture at 75% throttle and 4250 RPM. You would then input the RPM hold point (blue box on the screen on the right) and bring the throttle up until the dyno is holding the speed, and you have reached your throttle setting. The dyno will hold this RPM point for as long as you like.  You can now gradually adjust your fuel mixture at that data point and directly see the results of your actions. All of this is happening even though the vehicle is not accelerating. If the power is increasing, the green line will nudge the red line up the graph. If the power is decreasing, the green line will part from the red line as shown at right. Once you have found the maximum torque at this data point, you are ready to move on to the next data point. Tuning of fuel and timing maps that appear complex, are now easy to work through and can be optimized without guesswork. This can not be said about any inertia dyno. This is much easier and more precise than trying to make these adjustments while the vehicle is constantly accelerating, or by making a change and doing an entire acceleration run, then another change, then another run, as some of our competitors do. Our method is faster, easier, produces more consistent results, and can be precisely duplicated at any time. If serious tuning and real results are your goal, there is no other chassis dyno in the world that can compare with the Dynapack.