Quote:
Originally Posted by ss3011
Most governors , or auto 1-2 shifts are based on output shaft rpm . Electronic shifts are based on engine speed . The difference is on good weather days a governor shift will appear to shift at a higher rpm , due to converter slip . Electronic shifts will shift at the same rpm regardless of the weather . Might be a problem trying to dial in a car if the weather changes during eliminations .
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Have to disagree/clarify this. I chase this with newer Fords and the 6 speed auto all the time. First, they don't necessarily shift based on RPM. They can, but more often than not it is based on MPH so really output shaft speed just like the old transmissions. I can't speak to the other brands as I don't know what they use. Also consider the amount of time between the shift being commanded and finally completed. Engine RPM continues to rise, then pulls down until finally achieving zero slippage once the correct elements are fully locked providing the next gear ratio. On those good weather days when the engine accelerates quicker, you'll see more peak RPM during the shift which leads to more initial RPM in the next gear. Probably better than a governor, yes, but certainly not perfect across all conditions.