Hi,
first let me introduce myself.
For about one year i figured out how to tune MED9.1 using Nefmoto Forum, the Funktionsrahmen, S4Wiki and my own Car, Audi A6 with
BPJ 2.0 TFSI engine
. Now i´ve got a big experience by doing this on my "Test Car" step for step, value for value and many many flashes and logs
Now i´m happy with that tune-the engine runs really great.
So i took this experience and tranfered it two times on Golf 5 GTI with
AXX engine. After some tries and some corrections that 2 Golf GTI runs great as well. I´m noob, but i think i got it mostly under control-mostly..and there for i need your help:
First: i use on all cars 95 octane. All cars are stock.
Now i´ve got another Golf 5 GTI with the
BWA!! engine. All values in the ECU are very similar to that one in the ECU from the AXX engine and the engine itself is also very similar. I know there are different pistons and a little bit lower compression. So this engine should be perfect to give it more power.
The problem is, even if i give just a little bit more load, approx 10-15%, the ignition retards very hard and goes to the limit of -12deg. up from 2500 1/min. till approx 4500 1/min. When i give much more load, the retard goes to -12% and you can "hear" the knock directly from the engine. I know this is very bad
I tried many things to get this under control-lowered ignition timing, lowered Lambda, reduced load in this areas, so i could fix it a little bit, but with all that changes, the power falls down nearly to stock power.
Even if i use the stock values, there is no ignition retard or max. around -2 deg. I think this is typical.
In stock, the engine runs really well up to redline.
So the question: is there a known issue that causes extreme sensitive knock at this engine? Is there such a big difference in tuning AXX and BWA engine? Maybe i´m blind and forgot something.
Sorry for bad english, hope you understand my problem.
Thanks for your help.
Armin