RomRaider

Where can I find the KC maps?

I've just gone thorugh the knock strategy section and they mention "trimming" these maps.

I'm seeing in my ROM:

- Feedback correction (range, minimum load, retard value, retard limit, negative advance value, negative advance delay)

- Fine Correction (range, minimum load, retard value, retard limit, negative advance value, negative advance delay)

- Rough Correction (range (x2),minimum timing advance map value, learning delay)

- Advance Multiplier
- Advance Multiplier step value

But no Knock Correction map.....

What do you mean "trimming" the maps? Read the knock control sticky in the ecu analysis forum. Knock Correction Advance, as logged, is 'Timing Advance (Maximum)' with the 3 knock control elements applied.

I made a mistake; the article said "flattening" the KC map. It was in the tuning section.

Exactly which maps are being "flattened"?

Here it is:
Q What is “flattening the KC map”? Why do people do it and how can I do it?

People often flatten the KC map to make it easy to tell whether the ECU is pulling timing due to knock or not when datalogging. For example, if your KC map is all one value, if you see a drop in KC, the ECU most likely is pulling timing in response to knock.

When flattening your own KC map, keep in mind that you will want to keep the total timing (Base timing + KC) the same. You should go through your KC map cell by cell, if you add 5 to a point of your KC map, subtract 5 from the corresponding point of your base timing map. Don’t forget to account for interpolation off the ends of the map as often the base timing and KC maps are not the same size.

That's old advice. It is not necessary since you have the capability to log FBKC (feedback knock correction) and FLKC (fine learning knock correction) and the IAM to determine knock events with RomRaider's logger. Personally, I would leave your 'timing advance (max)' map alone and make changes to the base timing map when tuning. No need to flatten the advance map.

Understood,thanks.

so if i left my timing advance alone and just tuned the base timing i would still achieve the same as tuning both maps?

It's a matter of personal preference. Tuning the advance map impacts how much timing will be pulled when/if the IAM drops. Also tuning the advance map can impact one of the conditions for rough correction (i.e. IAM changing) depending on the minimum threshold. If you want to keep it simple, I would tune base timing, however if you understand how the timing logic works, then you can safely tune the advance map instead (or both).

thanks for that valid info merchgod, i've been trying to understand base timing and timing advance with little effect although i have tuned my 2005 wrx to 315bhp i still didnt understand the timing fully.
just one more question though
is it normal when logging knock correction advance for it go up to about 7-8 at wot if it is what is it measuring?
tahnks

read the knock control sticky in the ecu analysis forum - it explains how knock correction advance is determined. It is NOT the timing that is pulled due to knock. It is the advance corrected for knock that is added to base timing.

thats what i thought, its just when i start reading i forget what i've just read then i start to get confused lol.
would be nice if i could find a professional mapper to take me under their wing as i tend to learn quicker from being shown rather than reading.