^why not just use the gm 3bar like everyone else? lol... MAP sensor eliminate the NEED for a recircing bov *typically*
basically it works like this:
if you have a MAF, it needs to sense ALL air traffic going into your engine. however, if you place the BOV somewhere between the MAF and the TB, what will happen is this:
when you close the TB (like to shift or let off the gas or something of that nature) the turbo still pushes air against the TB creating a boost in pressure inside the intake tubing. the reason for a BOV is to vent out this excess pressure and prevent turbo damage (i forget what the term is, but basically where your turbine gets interrupted). a BOV must be located between the compressor and the TB. if your BOV is between the MAF and the TB, what happens is that the ECU reads x amount of air that it expects in the engine. when you close the TB, the BOV opens and releases air, meaning, less air in the engine than the ECU had already calculated for. when the ecu thinks it has alot x amount of air coming in, it will up the fuel to avoid running lean. however, if your BOV vents some of this air out, then your car will run rich, because the ECU does not know that the BOV has expelled some of this air.
with a blow-thru MAF setup, you can get away with this setup:
TURBO => BOV => MAF => TB
basically, in this case, when the TB closes, the BOV vents air BEFORE it ever reaches the MAF. however, the increase in pressure can still throw off the MAF, but not nearly as much as if you just dumped the air without the MAF sensing the loss of air.
in a pull-thru setup, it works like this:
MAF => TURBO => BOV => TB
and the BOV just has to vent in between the MAF and the TURBO. that way, all the air that the MAF tells the ecu is still there and the turbo is still happy.
in conclusion, the best way to run atmos. bov is to use a MAP sensor and the best thing to do with a MAF is a pull-thru, recirc. bov.
1994 Altima GXE - Auto
2003 Toyota Echo 2dr - Auto
Given away 8-20-09
1998 Subaru Legacy GT Sedan - 5spd
2.2L Motor Swap
New 2.5 5spd Transmission
Outback Front Bumper Swap
2002 Legacy GT Black Leather Front Seats
Borla Rep Headers