I had anther look at the timing maps, and I'm still stumped. I'm seeing load values in the rpm-vs-load line that are off the chart in the timing map, what values does the ecu use in this case? If someone could post a screen of some stock and modified timing maps side-by-side, with the rpm/load graph I might understand better what is necessary. The degree of variation in these maps and how important they are to the health of the engine is a little scary to me.
To be honest I think I'm in over my head with the timing adjustment. Would anyone like to "pick up the torch"? I would gladly test/log any changes so that we have a series of logs on the same car.
Okay, I'll try to illustrate the initial timing changes that I would make.
In the image entitled "new timing", you see the current timing curve which is the bright green line. I've drawn with blue the timing curve I would like to achieve, more or less. The changes noted below is my attempt at making the green like look more like the blue line I drew in.
Starting with the original values, I can see that we are making load that is off the end of the kfzw load axis. So, I first would modify that axis to better fit our application. In the last log I can see our load goes from 165 early on in the revs and tapers almost linearly down to 128 at 6000. I will pick 165 as our last axis value, and move the 140 row back where 130 is now. I then took the values from the last column (was 140) and pasted them into the second to last column (now 140). Then I just took the values of the last row and took 1.5 degrees off of it. I looked at the graph to verify that all the new values made a smooth transition at the end of the map.
The image entitled one shows where I then took areas from log where the timing flattens out, I added 2.25 degrees in the areas that needed more in the upper revs, and 1.5 degrees in the lower areas. Now, you'll see I end up with a map that's lumpy. This is were you can unleash your inner artist and smooth it all out. I defined the two areas that I just modified as my "high points" of the maps, so I won't adjust those much more upward. After you get done smoothing the curve, you should end up with something more like the image entitled two.
Most of the changes that I have made here equates to around 1.5 to 2.25 degrees advancement over the stock map. It's tricky to see that though due to how the load axis was modified.
I would then take these changes, flash them, log them, and look for any timing correction factors. If there are any CF's I would retard a bit at that rpm/load that the CFs started. If we are still at 0 for cfs, I would continue to advance the timing in increments of 1.5-3.0 in the areas needed until I just barely start seeing CF's and then finally adjust that area down a hair.
Hope that all makes sense.
