This graph shows Speed from zero at the start of the run to the max speed the vehicle achieves. The horizontal axis is Time in seconds. In this example, the vehicle went from 0-45.9mph in 18.5 seconds
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This shows RPM vs Time. The vehicle first started moving when the RPM was 2300. The clutch engaged at 2000 rpm. The RPM rose to a max of 5344 over the 18.5 second run. The gray background graph is the raw unsmoothed data. It can be disabled in settings.
This shows Clutch Engagement. The clutch was slipping a lot during the first 2 seconds, gained traction in the next 2 seconds, and was 100% at 6 seconds, and stays fully engaged the rest of the run.
This shows Torque Converter Engagement. The TC engages immediately, but start at very low gearing, giving the vehicle good starting torque. As the RPM increases, the TC adjusts gearing upward. If properly tuned, a TC will go into overdrive, which is shown at about 7 seconds.
This shows wind and rolling resistance vs speed. This graph is on a Polaris RZR 800. Rolling resistance is constant. Wind resistance starts at zero and curves upward as speed increases. The graph title lists resistances at 40 mph, where most vehicles typically have nearly equal wind and rolling resistances. In this example, the RZR has a rolling resistance of 60 pounds and a wind resistance of 65 pounds at 40mph. Pick vehicle type in settings to get typical resistances for that vehicle. They may also be entered manually. There is a Calibration mode that helps determine them. More on this, further down this page.
This shows Torque and Horsepower vs RPM. This was a stock Preditor 212 Hemi engine. The peak torque is 9.6 at roughly 2500 rpm. The peak Horsepower is 6.5 at roughly 4200 rpm. This graph is really the main point of BlackBoxDyno. It provides the same information you would get at a dyno shop. As you tune your vehicle, these graphs show your engine performace gains.
This shows the numbers versions of all the graph data.
This is a Time Slip, just like your get at a drag strip.
More Accurate Rolling and Wind Resistance
Rolling: To get an accurate rolling resistance of your vehicle, have someone pull you on it at a perectly constant speed, under 10 mph. No jerking. Just a smooth slow pull. Have something like a fishing scale in the tow line, so you can see how many pounds it takes. You may need a third person to run along and watch the scale. The scale will bounce around a little, but try to get a good average value. THIS is your Rolling Resistance you put in Settings.
Wind: To get an accurate wind resistance of your vehicle, cut out a 6"x6" cardboard square and take a picture of yourself holding it, sitting on/in your vehicle. If its a SXS or something with a windshield, put the cardboard sqaure out front. Put your picture in an editor, and copy the square all over everything that hits the wind, including you. If you are fully inside the vehicle, just cover the whole front of the vehicle. Count the squares. THIS is your Wind Resistance you put in Settings. This is the pounds of wind force pushing back on you at 40mph. The app scales for other speeds.
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