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Message
I'm working on a new theory about my
low MAP reading. The theory is that this isn't a problem at all, but
rather a difference in the way it's being measured.
What’s new about this
theory? This is what I was telling you a week or two ago. J
I apologize for lack of clarity, causing
you to have to re-invent this theory.
Al (Also running TWM TB)
The TWM TB has a MAP port about 4
inches past the entrance of the TB throat. That means I'm measuring
the air pressure on the suction side of the largest restriction in the system
(from wide open space, to 41mm tube). Since there's no significant
restriction downstream from the TB, I would guess that I could measure the
MAP at the inlet of the side housing, and wouldn't find it significantly
lower than what I'm seeing in the TWM TB. In other words, I'm
measuring the worst possible MAP, which is the suction side.
From what I understand, the typical
(if there is such a thing) intake has a large TB, feeding into an open plenum,
then into the smaller runners that go to the
engine. If I'm not mistaken, virtually everyone is measuring
their MAP in the open plenum, before the air has to enter the smaller runners
to go to the engine. In other words, the people who are
reading 30" are doing it on the pressure side of the largest
restriction.
I could babble on about this, but my
point is to ask where others are measuring their MAP (turbo folks need not
apply). You'll also have to give a general description of your intake
layout. I already know that Ed and Tracy are using the
"typical" situation. Is anyone measuring MAP in the runner to
the engine?
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