Hey guys,

I spent a week or two reading up on EDC16 as I got two of my own cars with this ECU. It's pretty simple torque based model as far as I can see but there are still hundreds if not thousands of maps and every time I dig into this I encounter some kind of surprise.

Anyway people that know SOMETHING about this ECU seem to be very secretive. I am trying to find the right approach and "extend" this torque model for more power. I believe the right way of doing things is extending maps further to allow extra torque to be calculated instead of modifying existing calibration data. This will of course take longer to do but I feel it's the right way.

Now as far as I can see "Drivers Wish" map requests certain amount of torque according to pedal position and engine speed, this further goes to torque -> injection quantity table and then through various calibration (start of injection, injection duration, common rail table) and limiter maps until everything is calculated. Most of these maps seem to be pretty linear but none of them completely linear.

I am planing to "extend" most of these maps. Shrink down X axis to allow for extra axis points, interpolate existing data for these points and then extrapolate data for points outside of known data space. I used various algorithms for this and I think I found some that work pretty well.

My question is, what maps can be modified this way to allow for extra torque calculations? I know some of these are impossible to extrapolate correctly. Data is not linear at all of some reason and it's really confusing me. Does anyone have experience with this?

I will be posting today a binary of my ECU and addresses of maps I found so far. I don't know if I found all the maps I need but it's a set of around 30 of them or so. I kinda get how fueling works but I am still digging into air mechanisms and how lambda map works with all this. I am also still not recognizing maps that have MAF readings as an axis.

PS. more and more I learn about EDC16 more I am wanting to return the car back to stock and get rid of the "tune" file I got from a very respected tuner. :-/

The stock binary file and maps are here: http://nefariousmotorsports.com/forum/index.php?topic=4308.0title=

Thank you for any contribution to this. I am for sure coming back with more question :-)

LOL. The whole euro tuning community is so fucked up and backwards sometimes.

prj, imho I don't see the difference between the two methods. None of them are extending existing torque model, they are modifying it. Why would you "adjust" already perfect calibration that numbers of engineers worked on? Why not just extend it? This is MB E320 CDI, i just posted binary and maps I found in another thread.

ddillenger, this is EDC16, not EDC15.

Aurélien, I don't think torque figures in ECU are the same as in real world. Otherwise this car should be making around 550nm according to NM -> IQ table because 77.7mg/str at 1800 is well above 500nm according to the table. Correct?

Ah.

You have to understand the difference between effective and indicated torque, in the ecu. 

prj, that's what I think of doing. Extrapolate instead of modifying existing values and pretending that it's going to inject X mg of fuel when it does more than that. It's automatic, 5-speed. I think I read somewhere that the limit is at 620nm or so.
 
Aurélien, I do understand the difference, isn't it what I wrote? Your question however leads me to believe that you didn't understand it. Torque used in the ECU is just a model. They could very well use any number there. But I do believe that from the start these numbers were meant to reflect the real world torque. Anyway according to ECU this car should make ~550nm of torque, it makes 500 according to specs so 50nm offset. So your question "Do you need more than 600nm" has no place. I do plan on tuning for more than +40nm of torque, yes.

Well, there is already a request for 600nm. This is however limited by torque limiter as far as I can see. I am still missing lots of maps I think. I can't see (or i am not recognizing) any MAF related maps I just found a couple of MAP based smoke limiters.

Any help with map hunting? I also have hard time recognizing axes sometimes (don't know what they are). This is my first file

ECU has limitation set to 1000nm for all gears as well as single value gearbox torque limit. I can not read out TCU, no idea if there is any tool to do that over OBD2 and you have no idea what a nightmare it is to get to it on these cars. This is certainly one thing I am looking forward looking into. Would like to raise shifting points and modify torque converter locking values.

Anyway i am making lots of torque above stock right now and transmission is ok, have been for a few years now. We have yet to get to that part.