NefMoto

I'm interested in making my timing maps suit ambient temps and different seasons. In summer ambient temps can be as high as 30C and winter low as -25C. Thats quite a difference. Obviously if I tune my timing during cold weather I will get some CF's during summer. I have tested this and my summer and winter tunes have about 6-7degrees difference in high load parts.

I found there is a map called KFZWWLNM. In my file its 0 for the entire map. I've seen files where its zero for reasonable IATs and goes lower when IATs go up and hot.
Then there are some files where its zero for a small part. Goes lower when its hotter and also goes up to +5degrees for lower IATs for example.

Could this map be really used to adjust timing this way?
I was thinking tune for zero CF during the hottest period and then make same tune when its cold. Leave base timing (KFZW) to summer setup and advance in KFZWWLNM for lower IATs up to how much it would handle in the winter.

Sorry if this is confusing or plain stupid. Trying to make things easier than switching files for winter-summer...
Thanks!

I was not aware of this map but it sounds promising.

This was my understanding of how this map worked.

KFZWWLNM is just for warmup, isn't it?

Thats what I read in this forum. But seeing differently caibrated files and for example I tuned a Seat Ibiza Cupra MK3 recently and couldn't get any CF's no matter how high I set KFZW, I got puzzled. But KFZWWLNM reduced timing for high IAT. I set that correction to zero and I gained 7degrees of timing during WOT before CF's were showing in logs.

Intresting as i see That map as wormup correction as well

its used all time

That is the name of the map the FR, but as overspeed said, it is always functional, not just during warmup.

In addition, if CWLAMFAW is set accordingly, it is used in the LAMFAKR path as well!

Added a section to the wiki here
http://s4wiki.com/wiki/Tuning#IAT_based_timing_correction

So... As my technical english lacks..

Am I correct in my assumptions and this map could be used to tune timing for summer and winter both the way I described in my original post?

This is great.  I was wondering about this one. Thanx N!!
In my Passat 2003 DH box, CWLAMFAW is set to 8. Is that by some conversion = 0??

Codeword is one byte. Byte is 8bits

So decimal 8 is 00001000 in binary. Switch to binary view for CW's
So in this case for your file, bit zero is 0

Thak you vary much mate!!

This appears to be the intent. In the S4 2.7t mbox at least the timing pull at high temps is significant! Never noticed it until now.

KFZWWLNM changes ignition angle depending of intake temperature (tans) not only on idle, it affects dzwwl which is added to zwbas and then forms zwout.

zwbas = zwgru+dzwwl+dzwob+wkrdy+dwkr+dzwzk+dzwbank
dzwwl = KFZWWLRL(tmot,rl) + KFZWWLNM(nmot,tans) * FZWWLRLN (nmot,rl)
zwgru = KFZW(nmot_w, rl_w) (=zwnws) + dzwkg + dzwoag + dzwol
All these dzw* change ignition timing angle depending of different conditions.

Look at how they pull angles in 1.8T
They also use FZWWLRLN <1 to reduce KFZWWLNM influence on low loads.

Just wanted to up this thread and report my testing. I've modified KFZWWLNM and FZWWLRLN. They're both 0 for entire map in my stock file. Been doing a lot of logging and testing, and they've come out pretty good. I kept my base timing (KFZW) the way it was during summer. 25degrees ambient and about 30degrees IAT during WOT. Now its about 10degrees out and IAT's are around 15degrees. I shaped my map to give most advance in higher rpms. So when I'm standing still and cooler is still warm, it has less effect. Once up to speed, I've gained up to 7degrees timing compared to summer logs. Since the weather has been getting colder gradually, I could test various IAT's and adjusted TANS axis accordingly. I will post screenshots of maps once I'm near my laptop.
Very useful maps indeed for those that live in changing climate

Keep in mind that more timing is not necessarily more power given the same quantity of air/fuel. The colder charge gives you better knock threshold. This explains why you frequently see OEMs give a little knock protection at the top but no added timing at the bottom. You really need to get the car on a really cold dyno to find the MBT torque and make sure you are not going beyond that. With your 7 degrees more there is a good chance that you're just putting more stress on the bearings and making less torque.