[mwebb]

Originally Posted by Phantom

I agree with what you said but only if the block is far enough before the MAF that it will see the total air flow being pulled through the intake. BUT if the block is placed to where the MAF sensor is in a space of dead air it will not read the total air being consumed by the engine.

the effects of turbulence that may or may not be induced by whatever in the air stream prior to the MAF sensor
will
be
Unpredictable and will vary depending on the amount of air flowing in the duct at the the time ...
i have already covered this in an early er post in this thread .
in any event the OP's system has not set a fault for fuel trim either way so the effects of turbulence in his system
(if turbulence is actually present )
have not exceeded the fuel trim correction limits which are designed to keep the system at
stoich or 14.64 to 1 , so his system is at
stoich or 14.64 to 1


but
i have not yet brought up the fact that blocking air flow to the intake will
NOT improve losses related to
suction throttling losses
and the effects will be increased as flow increases

so while the effects of turbulence are UN predicable
the increase in suction throttling losses will always
decrease
fuel economy .

no matter how you add this up
it
is
not
ever
going
to improve fuel economy or increase power output
===================================
you can however
reduce MAF signal and Calculated load simply by placing a resistor in the signal line or
on the 5v reference IF the MAF sensor is analog and not digital
and that will not be dependent on the unpredictability of turbulence and there will be no suction throttling losses induced by it

having said that
do not do it -
you have no clue as to the additional possible side effect you will cause
which have been partially addressed in this thread