Okay, so I was lurking around online the other night and came across this. At one point in our rotary lives we have all wanted to get rid of the dreaded AFM but cannot unless upgrading to a stand alone EMS. Well, when I saw this pic I couldnt just not post it and ask the question. Can it simply be moved or rather integrated into the IC piping? It is still technically doing its job or measuring air flow and air temp but its just in a different place. I understand its after the turbo and intercooler so I was wondering if it would have any change to anything. Say like it reads more air or cooler air temp due to the forced induction and cooled IC core. Any input would be cool, thanks



-B.

 

I believe that bye placing it after the turbo you get less of an intake restriction since the air is pressurized but i might be wronge.

 

id go with that. unless you installed it backwards so that it forces the bullet closed where NO air can pass through then that would just be stupid. A friend of mine mentioned something like blow-by setup where the AFM is in line with the Ic piping. He says thats how hes always setup his DSM but we're also talking about two completely different engines/cars all together. I still dont see what would be wrong with this setup. I think I may try it sometime but not now as my 7 is still in its half-way house. Anyone else have any more to add feel free.



-B.

 

You are messing up the calibration.

There is a purpose of why is always placed before by every manufacture. It even has to be level with the ground to work correctly.

Think about, turbo starts to blow, it just going to slide the sensor to full because of the pressure which means running rich when you dont have to.

 

Maybe, if he has a huge boost leak.



People do this all the time, to all sorts of cars. It works great with atmospheric bovs.

 

Alot of guys do it. It doesn't hurt anything.



And S5 AFM's do not need to be level, there is no flapper like in the S4 units.

 

well then its decided. Im going to at least try it out and if I dont notice any sort of major change (and I doubt I will) ill leave it. Just for some reason I like the look of direct filter -> turbo. even if it doesnt change anything except the location of the afm, I think it still looks cool. thats just my two cents tho.



-B.

 

i see it a lot in cars in japan, rx-7s and not. i think some do it to get rid of the rich condition when the bov vents.

 

its odd to me I guess since this is like the first time I have actually seen it done. I have thought about doing it and why it shouldnt work but couldnt ever come up with any excuse not to, or why it shouldnt. Maybe its just because to me its "different" or something is why I like the idea so much. Even though I am sure it has been done a million times over.

 

i ran my s4 that way for a long time. it was a real hard time to tune right because of the calibration. i removed the cover from the bottom of the meter and tightened the clock spring by 2 clicks. that helped a little. but after relocating it to before the turbo and resetting the spring all of my tuning difficultes went away. it can be done but tuning will be very time consuming.