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Afm Location Benefits

johnblack33

By johnblack33,
in Engines & Forced Induction

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johnblack33 Enthusiast

johnblack33

Posted
Posted

hey all, i was just reading up on how some people suggest installing the AFM in the cooler piping, i did a search and coulnd'nt find anything on this site, but i was wondering if anyone would know the benefits (if there were any) of having an AFM installed in the cooler piping (after throttle body apparently), as apposed on having it on the intake piping of the pod filter.

cheers JT

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https://www.sau.com.au/forums/topic/96538-afm-location-benefits/
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Craved Grand Master

Craved

Posted
Posted

i've considered this myself ..

my conclusion was that it may be affected due to the temp of the air passig through it at any given point ..

IE . after the turbo the air would be hotter than ambient.

after the intercooler . the air would be cooler..but closer to ambient temp

i thought that this may affect it due to the AFM being a hot wire type..

if anyone would confirm that would be great..

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

search button is generally a good spot.

use alternative words etc etc.

although AFM will have it, you'll just have to spend 5-10mins loooking through everything thats all as it going to get a lot of threads of various natures

rob82 Mentor

rob82

Posted
Posted

We often use post intercooler AFM in supercharged AU falcons as the standard length between throttle and AFM is about 30-40 cm. So when you introduce a intercooler with 2 meters of piping with the AFM placed before the supercharger you get a lean acceleration condtion on rapid throttle transitions. This only comes about because the standard ECU is calculating the air to be only 30-40cm away. That said the standard nissan ECU is calibrated so it expects the the pipe length, IC volume etc,ect into its calculations. It will have minimal effect if the AFM is placed before or after the IC as the AFM calculates the mass of air entering a cylinder.

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