It turns out my TP4070-1200 motor is actually a ~1500kv, instead of 1200kv, which means I've been running 128 km/h (79 mph) gearing on Badland tires through grass all along. Explains the higher than expected speeds I logged earlier and also why it was so hard to get to full throttle off-road without ending up in everlasting cartwheels. Did a quick no-load bench test with an Eagletree logger for different timing settings and these are the results:
Also got some running logs. Gearing in these logs is 23/43, 12/47 diffs and 133 mm OD tires, yielding 114 km/h nominal voltage, no-load, unballooned, zero-timing wheel speed (better be specific right?). Total weight is around 5300 g, wheel/tire weight 1044 g. I reduced front toe to 0° and rear toe-in from 3° to 2° (minimum with the adjustable 8T hinge pin brace) and got the front bumper off to reduce front lift. Unfortunately, the GPS logger has been a bit buggy after the last crash and keeps losing satellite lock, so I don't have good speed measurements, but given the RPM log and the amount of tire ballooning, speed should be in the order of 115-120 km/h again.
I made a high Current 8 awg bypass on the logger and re-calibration was done a bit quick and dirty with simple tools, so absolute accuracy of the Current readings is not guaranteed. Energy consumption based on cumulative mAh comes pretty close though, so it can't be too far off.
Combined datalog for 3 batteries (1st is Turnigy 40C 5.0Ah, 2nd and 3rd are the 60C 5.0Ah Turnigy HDs):
3rd battery Voltage, Power and Cumulative mAh; true runtime a little under 9 min until 3.5V LVC, with ~3.7V resting Voltage, putting through ~4.8Ah. Voltage sags 2-3V under heavy load, but not to the levels the Lipo alarm made me believe:
Zoomed in at three passes; forgot to log throttle input, but from the Current profile you can tell I'm building up throttle slowly; Current still goes up to 190-200A. I never tried smashing throttle to see resulting Current spike, as I hate painting... Also note how Current drops significantly once peak RPM (top speed) has been reached, as the Power component related to acceleration dies out then:
More pics to get to my 10 pic quotum :).
