Have done some searching regarding Resistor in line with the AFM circuit.
Now the argument I have read is that you won't get any more "flow" out the the AFM if you are maxing it out, and Z32 is your best bet. I can sort of understand this, but I fail to see why this wouldn't help with the rich running of the stock ECU if it's not maxing out? IF it puts out lower volts accross the whole range, then should it not think "less airflow, less fuel"?? ie. in my case, the AFM is 4.7V at max load, and obviously fuelling accordingly. If the volts were dropped to around 4.0 or similar (with a check on a dyno) surely this would help?
If I am missing something, can someone please explain it to me?