Logged some minor knock retard events on some area of my map according to MegalogviewerHD. I prefer to add a bit more fuel on the problem area and re test before resorting to timing reduction of the knocking area.

The question is, when using Target Tune should I add some VE to the area where I want to add fuel or just simply change the target AFR/lambda on the knocking area?

I understand that adding VE is the way to go for basic narrow band version of AT when you want to add more fuel to certain area VS Target Tune which is working in different way by using VE just for basic calculation accuracy (less correction by WB sensors if the VE are spot on) with the actual AFR/Lambda fully rellying on WB sensors feedback (full closed loop) therefore adding VE on Target Tune strategy will not add any actual fuel.

So with Target Tune I will need to just change the target AFR/Lambda instead of adding VE to the knocking areas?

Am I assuming correct?

 

Volumetric efficiency?
Is not the size of the lung the size of the lung? (and that metric that fills it? )
Unless I am out in the park here to change the VE is not like adding a gadget, or I would be right out there in the shop right now!
If you are running lean then you have to fatten it up.

 

I don't quite understand what you mean? So should I add VE or just add more fuel on target AFR table with Target Tune WB strategy? I am not running lean, most of the detected knock are around 2250-3500 rpm @ 30-90 kpa and the actual AFR (WBO2 logged) on the cells where knocks being logged are around 13.5-12.5 AFR, the knock are very minor between 0.25 to 1 with mostly just a few hit counts hence the reason I just wanna first try to add a bit more fuel instead of pulling timing.

 

Below tables are where the knocks happened in correlation of spark retard F&R, actual AFR F&R, and timing F&R



Spark Knock R


Actual Timing When Knocking Detected R


Actual AFR When Knocking Detected R


Spark Knock F


Actual Timing When Knock Detected F


Actual AFR When Knocking Detected F

 

Target tune works the exacted way as narrow band sensors. Dyno jet or Fuel Moto did not change anything in the calibration no matter what has been said. They are both going to center trims around the target AFR. So, if you want to add fuel. It needs to be done with target. Adding in VE is fighting the ECM if that area of the VE table is going to be ran in closed loop.

Let's keep this simple. If you want to run an area richer. You target a richer AFR in that area.

 

Right on point 👍 thanks for the insight