Bov Return And Afm

[Mr.Massive]

Hey guys,

I have always wondered about the BOV return on skylines being after the AFM.

My Question: How does the ecu register the return if the AFM is before the return? Does it do some sick ass calculations or what?

This question has just been annoying me can someone please answer it

Cheers.

[lachlanw]

wtf are you on about ?

the air coming out the bov return already went through the afm once . its just getting pumped around in a circle by the turbo as the throttle body is shut

[Mr.Massive]

But wouldn't the AFM think it would have to pump more air in as it is unsure about the quantity which is still circulating???

[mad082]

considering that it doesn't have to pump any air in when the throttle is shut it isn't really an issue. and as for when you apply the throttle again, it will just meter any air that does come through the afm, but the ecu probably is setup with mapping to take into account the air already in the piping. but the very short amount of time (and air) that it would take to refill the piping if you had an atmo bov wouldn't really make a noticable effect on things.

[Mr.Massive]

Thanks mad082.

[clip14]

if you take into account the actual amount of air an engine ingests at high rpm, full boost, the volume of air sitting in your charge pipes is relatively insignificant.