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Originally Posted by drivemusicnow
35% TPS reading does not mean that 35% of the surface area of the TB is open. It means that the TB plate is just over 1/3 of the way open. Technically you never have all of the surface area because of the shaft.
The larger the diameter, the faster the Airflow/%TPS ratio increases.
Please correct me if I'm wrong as I am definitely not positive about this, however experience has shown this to be true.
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When one thinks on this and considers the effect/disturbance/obstruction of the plate as well as changes in angle, it makes sense that the larger the diameter the less the effect on the airway. One could expect a larger shaft for a larger plate, but possibly not in a ratio with plate size, so there could be also advantages in this area.