Hi all,
First of all, thank you for a great resource in ME7.x and MED9.x tuning. What I have looked around, this looks by far the best forum for all things TFSI. I'd like to give short introduction. I have just started to learn my stuff. I have no background with car tech. When I upgraded my car from Nissan Almera to Audi A6 (2.0 TFSI, BPJ), I soon realized that I need to upgrade a lot of things I knew about cars. I drove Nissan for eight consecutive years, without any single failure or breakdown (just replaced lights for couple of times). Now it's different with the new car. If I would take the car to the dealer for each time, there's something wrong or I wanted something retrofitted, I would had paid a lot of money, for something it's possible to do myself. But hey, I don't complain. Even with the small stuff, which seems to keep breaking or needing adjusting, Audi is far more fun than the previous one
While reading about ECU tuning and seeing what's out there available for modern engines, I begun to wonder that what is actually being done when someone does a stage 1 chip tuning and charges you 700-1000 euros for the job (price range where I am at). Well, where I don't know cars I do love everything hacking, reversing and finding out how stuff works. In IT, there is no skill, which is not possible to learn with some effort. This is my motivation. Not so much to tune a car for a smaller cost. I really like to find out how stuff works and if with this knowledge it's possible to have some more fun, even better.
I've read some nice stuff about ecu tuning. I started with most available reading, how to tune your basic TDI engines. Seems simple enough. I've read TTQS excellent document about MED7.x. I haven't seen any other guides with this informative and helpful! I have acquired funktionsrahmen for ME7.x and MED9.1 which are available online. I've studied example files with maps of other similar ECU's that I have. I have enough information start analyzing maps with winols from my own ECU. But I don't want to change anything without understanding what I am doing. To get to more familiar grounds I've disassembled the binary with IDA Pro. Now I see that we're in the fun stuff with disassembling ppc binaries
Now to the beginner questions:
1. Funktionsrahmen and example files group relevant map to function modules (ie. MDBAS). Disassembled code contains your basic functions, like retrieve constants / 2d maps / 3d maps. Is there a similar functional grouping for the code, like it is for the maps? Should I be able to identify subfunctions which handle ie. operation of boost pressure control?
2. Is there a way to read EPROM dump (not just flash) from MED9.1 through OBDII port, like it is with ME7.x? I would like to keep my ECU in original state and clone it fully to a spare w/o BDM. I do have a clone MPPS v12. I've read about their issues when writing. So when I decide to get my feet wet and try my first flash / write, I would like to have a backup.
3. I understand that starting to learn tuning with MED9, it's not the easiest. If I understand correctly, there is not so much difference between ME7.x and 9 when it comes to tuning strategy (ie. what TTQS wrote). Am I far off? If I am, could someone explain from tuning strategy point of view, how MED9 engine control workflow differs from ME7.x?
4. My A6 has 170hp BPJ engine (2.0 TFSI) and MT. What I've understood, that there is not much mechanically different between the TFSI variations (some components vary). I understand Audi's strategy to have a crippled version of 2.0 TFSI instead of 200hp version. If it exists, it would decrease sales of more expensive 2.7 FSI. Even so, the commercial tuners offer Stage 1 tunes for the BPJ engine, with roughly 40hp increase, which take it just over 210 hp. Why this engine could not be stage 1 tuned similarly as 200hp variant (250-270 hp range) without physical modifications?
Please, keep up the excellent work of sharing the information!
Br,
Company
