First of all, this is my very first ECU ROM modification. I literally started this whole thing today (I received the cable after lunch and started to install the editors and read some guides...)
->Of course, I didn't try to flash it back to the ECU yet. (May be I will never write into that ROM at all. :mrgreen:)

So, here is the story...

I bought this 10 years old car, and I got curious about chip tuning (what it can actually do, how it really works, etc...).
My first goal was to see if one of the earlier owners of the car (there were two) applied any notable engine map modifications or not. They often got the car serviced by Audi, so it wasn't likely. (Now that I could compare the actual maps with some others, I guess it really wasn't "tuned" yet.)

And if I have the cable (a very cheap one, to be honest, but still, it seems to work...) and opened up the file in an editor then why not make some "minor" changes? ;)


Since this is a relatively old car (well serviced or not) with a relatively weak automatic transmission (01J CVT, aka Multitronic, with regular oil changes or not) I don't want to notably improve the peak performance. And otherwise, anything below peak levels (<70% pedal positions) are fine by me. I like the car in general. The low-middle sized engine with the middle sized car can be very comfortable with this wonderfully smooth (smart continuously variable) auto transmission.

But, you know, there are some rare occasions when you wish to have a high peak performance (just for a short time).
So, this is my goal with the engine map modification: Keep as much from the original as possible while improving the peak performance. But not too much though, because the CVT doesn't like anything above 310 Nm. :|

I looked at the maps and the guides and figured that may be I should leave everything (DW, MAF, SOI, ID, BL, N75, etc) at default except the torque limiter map.
I saw that the other maps were calibrated to work with up to 55mg/stroke. So, I exported the MAF map, used the last column to interpolate the IQ values for the troque limiter RPM points, rounded and truncated them down to 55 max and used it as a new torque limiter map.

This gives me an idea about the theoretical peak performance (when everything else is optimal) which should be somewhat better now, while the car shouldn't feel too much different during normal driving (no hard pedal pushes unless there is a problem...).

But I still wonder if this can cause any damage, since I have relatively big differences on some IQ values of the torque limiter map (old vs. new).
(I know, these won't actually happen unless I hit the pedal hard and everything else is optimal: temperatures, pressures, etc, etc, but still...).

Could somebody please take a look and tell me if this modification can cause damage to the car? (And possibly explain me why, so I can learn. :geek:)
Should I lower some low- and/or high-end IQ values? For example, apply a "max 120% of the original" filter on the values...?


And I am not sure if I should tweak the EGR map a little or not. (In Hungary, this car could probably get a green pass even without the catalytic converter, LOL. So, EGR tweaks would not be a big deal.)

Here is a picture about the changes. And some other pictures about how VAG EDC15P+ Suite estimates the new torque performance. (It seems I basically did a 96->110kW tuning after all. Even if it will never become reality unless I also tune some other maps. But I guess the torque map is fine if I choose to do so.)

Ah, well. I decided to actually tweak the maps a little (while still keeping the whole changset as simple and as close to the original as it possibly can be) while actually trying to extract a little extra power from the engine, so here is the V2 version.

How do you like it?
Last time some of you let me know that my slight modification "needs a lot more work". Ah, well, thank you for that anyway.
I didn't really intended to actually do a real tuning (but some small modifications only), but you still motivated me to do this. :lol:
So, anyway, now I wonder how you like this version and if you will motivate me further to make it even better. :)

But remember: This engine is attached to a relatively weak and old CVT box, so squeezing out every possible horses from the engine is NOT my intention. I just want to tune it slightly (get a little bit extra for those rare occasions when it happens to come in handy + to make the car feel more like "my own car", a little bit unique...). :crazy: