Quote:
Originally Posted by wrxkidid
Wait, but if it is being read at the wheels then how is it not what the car is putting out? Sorr I have absolutely no knowledge of how automatics work at all.
Lock-up is where it engages correct? So do they have a set RPM where this is achieved?
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No, it's the real torque at the wheels. But that's not the actual torque at the motor at that rpm because the slipping of the TC allows the motor to run at a higher rpm than the detected wheel rpm and multiply the torque output of the motor to the wheels. So when the dyno chart shows 300 ftlbs at 2500 rpm, it's very possible the motor was actually turning at 3000 rpm and making 260 ftlbs. So, if you're interested just in seeing what you're putting to the wheels, then the chart is fine, but if you're interested in tuning the engine at 2500 rpm, well that TC means your data is potentially skewed.
TC lockup is relatively consistent, but will vary a bit based on temperature, load, and probably rpm rate of change.