why is my motor pulling vacuum at high rpm?
09-20-2011, 05:36 PM
#21
Porting a MAF makes calibration much more difficult, even changing the intake tract can affect calibration.
IMO some of what you are seeing is Bernoulli's principle, the MAP location is right behind the spot where air is rushing in through the TB blowing across the MAP port.
IMO some of what you are seeing is Bernoulli's principle, the MAP location is right behind the spot where air is rushing in through the TB blowing across the MAP port.
09-20-2011, 05:40 PM
#23
Porting a MAF makes calibration much more difficult, even changing the intake tract can affect calibration.
IMO some of what you are seeing is Bernoulli's principle, the MAP location is right behind the spot where air is rushing in through the TB blowing across the MAP port.
IMO some of what you are seeing is Bernoulli's principle, the MAP location is right behind the spot where air is rushing in through the TB blowing across the MAP port.
09-20-2011, 07:58 PM
#24
Air rushing past the MAP sensor port fast enough can in theory make it detect vacuum due to the Bernouli effect, even if the whole plenum isn't technically under vacuum. It's a fancy name for a simple phenomenon that deals with pressure differentials and how fluid flows (air is considered a fluid in physics).
You can test that easily by running the MAP remotely with a vacuum line to a different port on the intake.
You can test that easily by running the MAP remotely with a vacuum line to a different port on the intake.
