Converter efficiency from in-vehicle logging?
06-24-2005, 02:48 PM
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Converter efficiency from in-vehicle logging? Some while back I tried to round up dyno graphs for
various converters locked / unlocked as a means of
getting broad-range converter efficiency numbers
(as opposed to the stated, peak "marketing" ones
that are all you get, if you're lucky, from catalogs).
I was able to get a few.
But I'd really like to get to a way, to measure converter
efficiency@RPM on my own car before and after I do my
swap, and let others do the same.
I conjecture that (for some part of the range, where
torque multiplication has fallen to unity) the efficiency
becomes simply RPMout/RPMin across the converter.
We have these available in all of the logging tools.
So this might work. My question though is, how to
tell where the efficiency starts "making sense" (i.e.
where does torque multiplication really drop to 1:1).
Perhaps just from the point where it bottoms & turns
back up? But that being the case, means efficiency
can only be judged (on this TCI 3000 converter) from
about 5000RPM-up. Evidently there is still some torque
multiplication going on below that point (see 98%
efficiency values at lower RPM, bloody unlikely).
Comments / theory / speculation welcome....
various converters locked / unlocked as a means of
getting broad-range converter efficiency numbers
(as opposed to the stated, peak "marketing" ones
that are all you get, if you're lucky, from catalogs).
I was able to get a few.
But I'd really like to get to a way, to measure converter
efficiency@RPM on my own car before and after I do my
swap, and let others do the same.
I conjecture that (for some part of the range, where
torque multiplication has fallen to unity) the efficiency
becomes simply RPMout/RPMin across the converter.
We have these available in all of the logging tools.
So this might work. My question though is, how to
tell where the efficiency starts "making sense" (i.e.
where does torque multiplication really drop to 1:1).
Perhaps just from the point where it bottoms & turns
back up? But that being the case, means efficiency
can only be judged (on this TCI 3000 converter) from
about 5000RPM-up. Evidently there is still some torque
multiplication going on below that point (see 98%
efficiency values at lower RPM, bloody unlikely).
Comments / theory / speculation welcome....
