|
The spreadsheet provided on that Instructables page is set up for KPH, so I just changed the ScanGauge II units for the coast down tests, so I didn't have to change the spreadsheet or do the math to convert anything.
I taped my camera in place to view the ScanGauge so I only had to start recording after getting up above 70kph and keep recording until the car slowed down below the minimum speed. If you have sound on the video, just say the particulars like "Run 3 going west" etc.
Also, you should do a set of runs *before* any mods, so you can calibrate the tire rolling resistance -- assuming you know the "factory" Cd for your car. Then when you do the runs with your aero mods, just keep the tire rolling resistance that worked best for the stock runs.
|