Quoting alansupra94:
Quoting jepherz:
Technically, if your BOV is open at idle it's probably sucking air in, not blowing it out.
The way speed density works though, you are tuning for your actual scenario. You could drill holes in your intake tract if you wanted to, as long as you tune for it (tune with the holes there). However, unlike a stock maf setup, you also need to tune every time you change something. This means you need to tune for new exhaust, new air filter, etc. With MAF, you don't have to.
And to the comment about speed density using IAT and baro, that doesn't have anything to do with it. The stock setup uses IAT and baro as well.
A stock setup is 'more correct' in that it is actually calculating how much air is entering the combustion chamber(s). Speed density is less accurate in that it just allows you to 'tune' your ecu to equate X amount of air to Y amount of pressure from your map sensor.
I think you mean MAP. I am not trying to be a dick or grammar nazi but having MAF there might confuse people.
No, I mean MAF.