AFM to Throttle body calibration

[Pacey]

Hey all

Sorry I havn't been online for a while, just back from OS.

 

I went for a drive upto Daylesford today and noticed that when my AFM flap is fully open, I still have a lot more to go with the accelerator pedal. The reason I know this is because I run a Jaycar Digital Fuel Adjuster on the AFM which tells me the voltage through the whole range of the AFM to which I have tested the range of the voltage on the potentiometer.

 

Just want to know if the AFM and throttle lever position need to be in line with each other all the time

Eg: when the AFM flap is open 50% should the throttle position also be the same and so on throughout the range.

 

I could possibly tighten the AFM coil spring to try matching the throttle position, i know this will lean it out drastically, but then I could manipulate the voltage coming from the AFM to ECU with the DFA and get the air/fuel in a good range..

 

What are your thoughts on calibrating the AFM flap with the Throttle position..

 

Cheers

Alan

 

 

 

[Zedman240®]

That may not work as the air flow meter is only supposed to measure air flow. So say you're climbing a steep hill, and your throttle is open 90% and there is little airflow, that tells the ECU the engine is under alot of load so it needs more fuel etc. If you modify the AFM to match the throttle, the ECU will be told incorrect parameters so you may get more problems.

[Pacey]

Thanks Dimitri

Yeah I understand your point, I wouldn't want to go tightening the circular spring on the AFM too much to restrict the air flow to the throttle body, maybe just enough to get in balance a bit more with the throttle postition.

 

I suppose my concern is this..

If the AFM is 100% fully open and the throttle body only 80%, this means the ECU is getting the same voltage signal from the AFM for the remainder of the 20% throttle opening..

I would like to be able to control the signal all the way through the range..as I can do this with the Digital Fuel Adjuster..

 

Feedback would be much appreciated..