At 52*50mm size, it gives about 130mbar pressure drop at 232hp.
Pressure drop on the intake side of the turbo is much worse
than on the pressurized side. Turbos give a pressure ratio, not a
set output pressure. That means that to get 1.1 bar boost (2.1 bar absolute)
with -0.13 bar intake pressure (0.87 bar absolute) needs a 2.1/0.87=2.41
pressure ratio! That's as bad as a 310mbar pressure drop after the
Adjusting the spring tension does not give quite linear enrichment/leaning.
So I do not think it is worthy, and plan to get rid of the damned
There are two sizes of Air Flow meters, 80mm od and 70mm od inlet,
flap size is about 52*50mm or 58*56mmm.
Karman-Vortex type air flow meter
Used at least on 7M-GTE and 1UZ-FE.
Hot-wire air mass meter is one quite common one but Toyota does not
use them. Also, there are no Toyota mechanical fuel injection
Many TCCS systems don't have an air flow meter at all, but use
a combination of MAP (Manifold Absolute Pressure) and a more accurate
throttle position sensor. This gives the smallest intake restriction.