Dynamic Advance?

I've been trying to figure out exactly what my accessport v2 is telling me with live data monitoring of 'dynamic advance' and what ranges I should expect to see.

I found THIS, posted by COBB recently, which explains a lot. So basically this is an indicator of how happy the ECU is and corresponds to how aggressive it is advancing the ignition based on the tables?

With a healthy tune what peaks should I be seeing and do the COBB staged maps adjust these tables?

Thanks!
Justin

 

Hmm found THIS on the COBB forums, which pretty much says:

"Dynamic Advance: This is the amount of timing the ECU either adds or subtracts from the map based on how the car is running. The higher the number, the more timing the car is adding. If the car sees detonation or pinging it will pull timing out until it goes away. Positive numbers mean the ECU is getting "comfortable" with it's timing and is adding some. Usually adding timing makes more power."

So I guess as long as you aren't seeing negative numbers often you're fine?

 

Yeah I thought about PM'ing them but was curious if anyone else knew before I bugged em

I lived on campus my first three years, now I finally have an apartment up on Shallowford. It's a 10 mile commute, but definitely worth it :wiggle:

 

I am not too familiar with the dynamic advance but have the same understanding as you. I do know once tuned SS said that at WOT it should go right to 10 and maybe drop to 9.5 as it nears the redline. Anything neg or really low he says to LIFT.

 

IAM (some call it that)
I know the DBW use 0-1 and the rest is 1-16
IAM = ignition advance multiplier
when its healthy is at 1 or 16
and will read your map for timing and knock correction
to simplify what it is -
when healthy you get both timing + (knock correction x IAM(%))
when not healthy you get timing + (KC x 50%) if your IAM =8 --> 8/16 = 50%

so NO
it does not add more when its healthy but runs your max timing on your map table but reduces it when itsnot happy.

and it does not go back to 1 or 16 immediately, unless you reset it. Some people use the Vishnu method. But why ? if your car is unhealthy there is a reason so why bandaid the problem.

if your KC is dropping frm your designated map then few things can be happening - map was tuned to aggresive or the factors have changed (fuel, air, temp, etc,.....) this can happen and still have IAM @ max.

 

Thanks, exactly what I was looking for :si:

 

goixiz's answer is what you are looking for.


what techlord is talking about is the end result of dynamic advance aka IAM.


In his instance he is tuned for 10 degrees of knock correction and as long as his IAM is 16 he will see all 10 degrees.

 

yeah what those nerds said!

 

Ahh thanks, still a little confused though -
AP will tell you both dynamic advance and ignition advance, and based on this article
http://www.cobbtuning.com/info/?ID=3487
it looks like the dynamic advance is just based on the calculated load of the engine while the ignition advance takes into account the multiplier and all that other stuff goixiz talked about. It stays at 0 at idle and climbs under engine load to 10-11. I've just read siegel talking about how useful it is to monitor and was wondering why .
Thanks for the info!

 

from the link
cobbs Dynamic advance table = knock correction -- is a table / map not a calculation
its a 3d table so need load and rpm to get the value

Im not familiar with the knock learning chart i think thats new
i dont use AP - i use enginuity

DA multiplier = IAM

 

The actual timing that a car runs is Ignition Base Timing + Dynamic Advance. I set my cars so they have a smooth Dynamic Advance map, that lets my customers know when their car is running "full advance." If they're running full advance then they are "happy."

Siegel

 

Looks like the correct answers are in this thread already.

 

if you are running one of the Cobb Base maps then its almost pointless watching the dynamic advance as it will run anywhere from 4 - 13 degrees.

 

Thanks for all the info! Now I can sound edumacated when people ask