See that's the problem, once you use them, you can't be without it. The EVO 4 is going on my kids big block Chevelle this summer. More then anything, its a time saver, all info, each run. I have two kids that still race big track karts. We leave end of March for Laguna Seca in Calif. New track for us. we don't have days to learn the course, we have an hour of practice or so. With a 3000 mi ride to get there you need info first time out. Karts now have MyChron 4 with GPS, will get MyChron 5's on karts before we go. GPS gives a very exact drawing of the track, you can zoom in on corners and see track lines even when the vary by only an inch. Click the mouse at any point on the track map and all parameters read out at that point. Acceleromitor will read out G Force at that point, you will see how the tires are biting or wt transferring. You can overlay any laps over each other so you see where your changes happened good or bad. You can even ovelay over Google Earth maps to pick out land marks on a long track. When going to a new track, it has a feature that can graph percentage of time spent in any user defined RPM ranges. I always use this first session because for us, sometimes using more gear to pull off corners or up hills is more advantageous then gearing for power at the end of the straights.
They make sensors for throttle, brake and steering posisition, my kids now mid 30's have done this since 8 and are multi times National Champs, now I leave that to them, but on the older ones race sled we did use shock travel sensors, gave them to our shock guy and he set up our shocks on his dyno off the data. He loved the info.
With sled testing, any gauge with the accelerator will graph in either time or distance. you can set it up for say a 500-600 or 750 ft track and again overlay sessions to see your clutch changes. The appear just like the graphs in Aaens book
