ZWBEG and ZWOUT

[prj]

Well, on the V8 the knock control is done by different chip and totally differently. One that does not use an external memory.
So I don't know - I can't tell you, I never reversed this.

On 2.3.2 the signal from the main processor is sent as-is to the knock processor and the knock processor simply sends it to the correct cylinder (solid state distributor) and introduces a delay into the signal when knock control requires it. This delay is logged with prjmod per cylinder to output knock data.

[Acki]

At the moment I didn’t catch how the ZWOUT is impacted to this behavior.

I can only guess. Need to spent more time to understand the code.

I will investigate the second cpu binary too.
I hope I don’t have to create communication between both CPUs to get a merged datalog..

At the moment I’m happy how the engine is running.

Next steps will be to read out the MCU, to check the schematics - possible one port is used for knock control on/off too and more testing with different fuel.

One thinking is, ignition isn’t always knock limited, sometimes more advanced ignition produce less power - to find a was way to understand how much ignition is enough. Access to a Dyno isn’t easy possible. When do I improve fuel economy and when I worse it (part load).
Full load I can check for the delta engine speed on the same road. Some full load pulls and I can check for the acceleration.
At constant load I have to think about if load and tps are a proper way...

[prj]

Well yes, you can see how the merged datalog was created with prjmod.
I can say it took a LOT of work to get the timing right and I am quite proud of it actually.

[Acki]

I’m sure that’s a lot of work!
May some of the 5banger boys could make a datalog with RAM_53 and RAM_54 and we could compare :-)
It’s nice to see how fast the fast path idle control works via ignition angle and also the other ignition impacting functions. :-)

[prj]

Fast path idle is simply a single map that gets activated when throttle is released, It's in the main ign angle.

[Acki]

You are speaking about code_2118 or code_44F1 (RS2 with prjmod)?
The impact via code_44F1 you don't see at RAM_54.
idle.JPG

[prj]

Has been too long for me to remember.

Feel free to fix the logger though and update the wiki xD

[Acki]

Ignition Angle = (Z-(Y-X))*0.75
Z = BM - XRAM_5F
Y = Ignition - IRAM_54 (ZWBEG)
Z = Idle correction angle - XRAM_167

I wouldn't say "fix" - I'm sure a lot of people didn't care about idle control ignition correction

I can write something into the WIKI but I'm a little bit reserved cause I don't drive a 5 cylinder or prjmod firmware...

/edit:
Idle ignition angles

ZWIdle.JPG

[Acki]

knock.JPG
That's the "very" simple knock control of the V8 :-D

This knock control needs modifications ;-)