How stock ECU regulates timing advance??

[Stez]

How stock ECU regulates timing advance??

i read some articles and they told that ECU has it's own timing maps, ECU uses signal from rpm, knok and intake air temperature sensor signals and after that gets the number of timing advance, is that wright???
does stock ECU uses some more signals to decide what timing should it go????

if we would have a device wich would regulate intake air temperature signal at differrent rpm, would it be possible to regulate timing????

And onother one question: does anybody know how exectly maft pro regulates timing?? maft pro is not a standalone - it's piggyback unit, so it has to full the ECU in some way to regulate timing, how does it do this?

 

[DSM90AWD]

The ECUs timing tables are airlow and RPM based, governed by knock feedback and the global "Octane" value which is a long-term knock trim.

You can monkey with the airflow value your ECU sees with a piggyback computer, hacking the MAS or adding a potentimeter to the MAS' Barometric sensor which would indirectly affect your timing (less airflow read = more timing). Though via an aftermarket EPROM or DSMLink you can physically change the timing maps without the need to lie to the ECU about airflow.

Here's a nice primer on piggyback tuning

 

[spyderturbo007]

The ECU also uses things like IAT and coolant temp in it's timing calculation. For example, IAT over 84 degrees and you lose 1 degree of timing. Coolant temp over 206 degrees and you lose another degree.