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Bosch uses the IAT input to alter timing, this functionality exists in the factory chip! With the factory AFM, the IAT is used to alter ignition and fuel! It is not a guessing game.
The claim that the amount of timing that can be pulled based on IAT is limited, is a false statement. I differ by saying that the amount of timing can be set to whatever the tuner wants to set it to. So it is not limited. (Of course you have to know the code to do this).
Cars with a knock sensors (951, 944S2, 944S, 964), have a additional variable to work with "Knock Sensor". However even engines (964...) with knock sensors, still use the IAT to alter timing.. The above cars I listed also use the IAT to alter fuel as they use AFM.
Cylinder Heat Temp is another input that is used by some of the DME (Air cooled engines)....
Same as IAT and CHT other sensors are used...
Proper tuning takes into consideration MANY variables and inputs from various sensors. ONE of which is IAT!
Timing control based on IAT is not limited. It's a programmable variable!
Back to the main issue. Adding a IAT to the APE MAF will address a problem (timing), but will introduce another one (leaner AFR). At the same time, depending on the timing used on the chips, the values being pulled based on IAT may or may not be enough... A proper Air Mass conversion will use a IAT and the code must compensate correctly.
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