There are tons of archives there for this sort of thing...
The power/gas mileage trade-off seems to be apparent wherever you look.[ http://co.dsm.org/vault/list_archive/2001/10/17/025.txt ]
There is no difference. It has nothing to do to with whether the BOV was
designed to shoot air into a pipe or out into the open.
I think it was explained in this same thread yesterday, but here I go, just
in case. ;) The problem is with the car's fuel injection system. The ECU
injects a specified amount of fuel based on a reading of the air mass
entering the engine. That reading comes from the MAS (surprise). If, at any
time, you remove air from the system after the MAS has counted it, the ECU
will not know you have removed it and will inject the proper amount of fuel
for the original air mass reading. Since some of that air was removed, the
car runs rich. When the BOV vents back into the intake (behind the MAS) it keeps all the
counted air in the system. The ECU is able to inject the proper amount of
fuel, retaining a balanced a/f mixture. When you vent the BOV to atmosphere, it removes counted air from the system
every time it blows off. The ECU does not know the air has been removed, so
it injects more fuel than is actually necessary, causing a rich condition.
On some cars, this is bad enough to cause a stumble. All DSM's will take a
performance hit because of this, unless they have upgraded to a different
style of air mass sensor, like a VPC.
Ken Deis
Later
Josh
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