AFM Post turbo??? How could it run?
- Thread starter Alec
- Start date
vry much posible. lot of mkiv guys here do it. as long as the meter is pre TB and manifold than it would be ok. as far as kv signal accuracy to the ecu i cant be too sure.
not too sue about how that BOV is placed though. seems like its far too far out of place to be working properly
not too sue about how that BOV is placed though. seems like its far too far out of place to be working properly
Can/Has it been? Yes, but i wouldn't recommend it. The MK3 Karman Vortex AFM can only measure volume or CFM. The placement of it should be before the turbo as before the turbo the only variables to the air are temperature other then barometric pressure with altitude. After the turbo the air can be pressurized greatly changing its density and changing the required fuel per cubic foot of air mass.
MAF sensors such as "hot wire" sensors can go after the turbo because they measure MASS AIR FLOW usually in grams per second. This measurement is more accurate then the karman vortex signal and will account for boost. The higher density air will absorb more heat from the wire then less dense air.
The MK3 AFM does not actually measure air flow, It measures air speed and air temperature separately, and reports those two signals to the TCCS. The TCCS uses those two signals with other data to calculate how much fuel to inject. Because there is no pressure or density factor in the calculation the TCCS would not "see" the added oxygen content from pressurizing (increased density) the air.
MAF sensors such as "hot wire" sensors can go after the turbo because they measure MASS AIR FLOW usually in grams per second. This measurement is more accurate then the karman vortex signal and will account for boost. The higher density air will absorb more heat from the wire then less dense air.
The MK3 AFM does not actually measure air flow, It measures air speed and air temperature separately, and reports those two signals to the TCCS. The TCCS uses those two signals with other data to calculate how much fuel to inject. Because there is no pressure or density factor in the calculation the TCCS would not "see" the added oxygen content from pressurizing (increased density) the air.
PS: A picture with the AFM in that location does not mean the car runs well... or, for that matter, runs at all.
That still doesn't mean the car runs very well. A VW rabbit diesel circa 1982 can get smoke under the tire when needed.
It can make 400 rwhp on a carburetor and not run and idle real well. The meter does not go there, and the person that put it there should'nt be around vehicles. Well, he can monkey with his own. He shouldn't tell anybody he knows what he is doing.
