What does it mean when advance multiplier increases?
 

So my standard advance multiplier on ecutek is set at .7, however yesterday on the highway it went to .74. I know that dropping on adv multiplier is pulling timing so does increasing it by .04 advance timing? If so, why would this be the case? (I'm a turbo)

when advance multiplier is lower than 1, then the ecu constantly tries to advance (rise) ignition timings to increase performance

Final timing = base timing + (ignition advance * IAM) + compensations. So it means that rising IAM => adding spark => it is ok, engine not knocking (in such areas).

Odesláno z mého SM-G973F pomocí Tapatalk

Yes it advances timing as it increases. If it increases, it means your ecu is not detecting knock. If it decreases it means your ecu is detecting knock. When less than 1, the ecu will continually try to increase ignition advance, then listen for knock at that level. If the amount of knock crosses a threshold, it decreases advance and checks again. This lets it hover right on the edge of maximum advance (and therefore maximum performance) for current conditions.

Increasing advance multiplier is usually a good thing, it means little or no knock detected.


Its a little unusuall that your tuner has set advance multiplier intial at 0.7 and not 1 like most tuners will on turbo or sc cars.


Hopefuly they tuned car with advance multiplier at 1 for little or no knock then set it back to 0.7 for safety.



If they tuned it at 0.7 advance multiplier , then the ecu will keep adding timing till it knocks, this isnt rearly that good on a turbo or sc car. I saw this a while back when a tuner unfamiliar with subaru tuned a car.

So could the reason for the timing to advance be temperatures dropping outside?

How will I know they tuned at 1.0 or not? Or is that a question for my tuner?

Look at the IAM befoe you turn car off, if its above 0.7, say 0.75 and then you turn car off. Then turn car on and start, if iam went back to 0.7 then iam initial is set to 0.7 not 1.


If iam is beliw 0.7 then its not posiible to tell.


Ecu will set iam initial value of iam if iam was higher than iam initial when engine switched off, if it lower than iam jnitial it remembers lower value