|
Message
Greetings,
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.
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?
Cheers,
Rusty (duty
calls...)
|