RomRaider

The car is 04 EU WRX (16bit).
My understanding of how final timing is calculated:
Base timing + IAM * Timing Advance
However, even though my IAM is at 16, the final timing is smaller than Base timing + TIming advance
What am I missing?

I think the timing calculation for 16-bit ECUs is:



For 32-bit, where IAM is a value between 0-1 (ai. 0-100%), the calculation is:




But I'm no expert and if I'm wrong, I'm sure I'll get corrected.

Yes that looks reasonable, exactly what I meant, just with more details
However in my logs I don't see that hese values sum up, some examples:

Ignition Base Timing | Knock Correction Advance | Ignition Total Timing | calulated sum (IBT + KCA) - what I expect in the ITT | difference actual - expected
WOT:
1.8 | 9.84 | 9 | 11.64 | -2.64
6.72|9.84 | 13.5 | 16.56 | -3

Cruise:
27.46 | 9.84 | 34 | 37.3 | -3.3
38.36 | 9.84 | 48 | 48 | 0

Decel:
11.99 | 9.84 | 10-20 (floating) | 21.83 | -12 to -2

DO you see what could be causing these differences?

Maybe it's in 'other timing compensations', like Intake Temperature Compensation?