AFM placed vertically, is that possible?

Mxgrds

Mxgrds

True Classic
To save space, i have placed the air flow meter vertically just before the turbo. Will that effect readings? Does the afm needs to be installed lying flat?
 
AFM is designed to operate horizontal. If this mechanical position is significantly altered, spring force on the flap, friction of the parts involved and more are going to be altered from how they have been designed to operate. Sensors like this have been designed then produced in this way for very good reasons, alter this.. there is no assurance the AFM will function as it once did, as it was designed to function.


Bernice
 
This is how I placed my AFM on a my earlier engine set up. I made a bracket that bolts to the cam carrier from which you hang the AFM. The location was also as a result of the using the original turbo to AFM pipe from the Uno turbo which helped create the handy location. The air filter has been removed and would have been a pipe feeding from the side air scoop. As Bernice says the spring force is a delicate balance if it is to work correctly.
 

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Thanks. There is a difference however if the afm is place flat with the plastic cap facing upwards or like Jon’s placement. In Jon’s setup gravity also plays a role on the flap. Only if the position of the flap axis is vertical gravity is eliminated. If there was no spring, the flap would hang open. As in my setup.

This would be the correct setup
 
Not just the spring force balanced between air flow -vs- friction of the flap sensor system, the flap has a air space behind it to act as a rate of flap change with air flow damper. Incorrect mounting orientation will throw the entire finely tuned system outa whack.

Bernice
 
I know for tuning purposes you can alter the flap spring rates and so that would possibly allow for different orientations , but you would need specialist knowledge way above my pay grade
 
I asked this question because at the apk (mot) station they measured 11% co2 in the exhaust and pointed me to the position of the afm. But today we checked again and it turned out that their new instrument wasn’t properly working yet. Remeasured it was around 1%.
The UT drives fine with the afm in the upright position. My assumption is that only gravity on the flap plays a role and that is compensated with the c02 adjustment screw. Gravity pulls flap a bit further open, screw a bit more open to bypass more air. Flap closes a bit. My theory.
 
Mxgrds said:
I asked this question because at the apk (mot) station they measured 11% co2 in the exhaust and pointed me to the position of the afm. But today we checked again and it turned out that their new instrument wasn’t properly working yet. Remeasured it was around 1%.
The UT drives fine with the afm in the upright position. My assumption is that only gravity on the flap plays a role and that is compensated with the c02 adjustment screw. Gravity pulls flap a bit further open, screw a bit more open to bypass more air. Flap closes a bit. My theory.
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Perhaps this is a confusion as to what is measured. 11% CO2 would not be entirely out of whack, just as 1% CO is quite believable for a carburated engine.
 
Won't lateral G's while turning and large acceleration/deceleration have an effect on the flap regardless of orientation as well?
 
X approved roadworthy for 2 years. CO was ok. Car drives fine. I am not noticing any behaviour which I can relate to the position of the AFM.
 
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