maf location

[JDMazdaFamilia]

Is it better to mount the bov on the charge pipe or before the turbo?

 

[BRIAN_MP5T]

It cant go before the turbo

 

[JDMazdaFamilia]

Whys that?

 

[Spiced MSP]

if Im reading this right, going before the turbo means you would be mounting your bov on your intake. Most people mount their bov on the cold pipe a few inches from the throttle body

 

[JDMazdaFamilia]

What do you mean on the intake?

 

[jdwk]

The BOV must be between the turbo and the throttle body because it is there to reduce the pressure built up in the intercooler piping when the throttle closes.

:Technically everything until you get to the cylinder is an intake, valves, IM, throttle body, cold pipe, intercooler, hot pipe, compressor, intake, and filter. But when we say "intake" we mean the pipe going from your air filter to the inlet on the compressor. A BOV on that pipe would do nothing.

Our car uses a MAF to meter air and add the appropriate amount of fuel. Typically this is inserted on the intake piping just after the filter. If you release air to the atmosphere that has been metered by the MAF, the car will add fuel for the released air when you close the throttle and you will get large puffs of black smoke or possibly a nice pop and a little flame come out your tail pipe.

This is not recommended. To fix this problem, you must recirculate the air from the BOV back to the intake after the MAF. This is how our stock bypass valve is setup. Or, as some people have done, you can move the MAF to the cold pipe going to the throttle body, and as long as the BOV is before the MAF, it will not meter the released air.

 

[KrayzieFox]

On the exhaust manifold?? EWG/BOV FTW!!

But to give a serious answer, you can place it anywhere after the turbo. I think what you meant to ask was whether to place it before or after the intercooler. In which case, either will do.. as long as you relocate the MAF so that it's after the BOV. If you don't, then you will need to recirculate the BOV back into the intake. If you vent without moving the MAF you will have stalling issues.

 

[stevew145]

The title of the thread reads maf location, maybe he had a brain fart in the actual comment and wrote bov instead of maf. To cover both possibilities. A bov has to be after the turbo, in the pressure always. Otherwise, how is it going to "blow off" pressure. The maf can be before the turbo, or after the turbo AND after the bov, this way metered air isnt blowing off and causing backfires/flames/stalling/general badness.