TJ Goettner wrote:
> where exactly on that site?
Sorry - I can't point to an exact location. I seem to go off on tangents every
time I visit that one. In general tho - one might think that a direct
measurement of actual air flow in real time would always be better than
calculating it. I wondered myself for a long time. Even wanted a MAF-based EFI
setup myself because I see how easy the mustank boys have it w/mods. The most
confusing part is that none of the aftermarket vendors even offer a MAF-based
setup.
Then after doing lots of reading on the subject - I found that a MAF-based setup
can have problems like air vortex missing the calibrated measuring position,
loosing calibration over time, getting the "hot-wire" contaminated, and lots of
other reasons that result in a very inaccurate estimate of the actual air flow.
The devils advocate in me said "But how does a MAP-based setup differ? Surely
it has problems as well????"
So then I did alot of reading on MAP based systems (ok so I'm a little obsessive
8). Turns out the MAP-based system do indeed have problems as well (like when
the MAP sensor looses its ability to sense a wide range of vacuum) but they are
apparently cheaper to build? huh? That didn't make sense? More reading....
Bernd is right that some of the best avail factory EFI setups use BOTH MAP and
MAF - I'm guessing that they correlate the info in an attempt to get a more
accurate estimation of the intake air and thus fuel requirements at that point
in time. Guess we could study Formula One as those guys don't play! I have
talked to the McClaren team (at CA-World - they run Unicenter TNG on the car!)
and just to give you an idea...they said that some teams will be bringing their
own dynos over here (North America) because there are no dynos known to exist in
the states that will work with the power range of the Formula 1 engines
(12-18,000rpms).
Better stop - I'm rambling again...
Latr,
Shane
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/AccelCoil/MPComp/HookerSuperComps/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:00:25 EDT