Originally Posted by The Usual Suspect
is it that its just easier to map on aftermarket ecu,s when i was on ofab i was told simlar but main reason being its just so much easier and quiker and idle is alot better?
Effectively yes, although its not the actual "mapping" thats the problem its basically the config.
Imagine you have a value 0-255 representing how long to open an injector for
then you have a scaling table saying how long in millisecords that actually is
then you have a value saying "also add X number of ms"
To get a decent idle on a big injector you dont just need to change the normal fuel map, you need to start altering one or more of the other bits of data too in order to get the damn things to open for a small enough amount of time to not go stupidly rich on idle
all this stuff is easy to do on aftermarket normally, but OEM stuff its FAR harder as bare in mind there is NO friendly interface to all this data, its basically just 0s and 1s