NefMoto

Hey there. I am new to the forum and to the beautiful world of EFI Tuning
A have an issue with my 2007 Audi TT 2.0T BWA. Around 2000-3000RPM with ~30% Accelerator Pedal position I hear my DV screaming like a wild pig. I have made couple of logs with VCDS and figured out that i
Actual Boost is lower than Specified Boost (which confuses me- why would the DV open during underboost?). In that situation the Actual Load is lower than Specified Load. Is there something limiting load then? Ive checked KFMIOP couple of times which is a perfect „invertion” of KFMIRL, also LDRXN makes no restriction to the load. What is interesting, in logs there is a big difference between actual and specified load. Below are some screens from logs and my KFMIRL and KFMIOP. (https://uploads.tapatalk-cdn.com/20191008/1c177eec17f6fe8bf1ba63ac0961a883.jpg)(https://uploads.tapatalk-cdn.com/20191008/d8006db1a1367e751b36ada49c39eda9.jpg)(https://uploads.tapatalk-cdn.com/20191008/4587ca1a0bb4c08475cb80592d3f1923.jpg)(https://uploads.tapatalk-cdn.com/20191008/3d3cb4d07dc656bd5d171e4305579933.jpg)


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hmmm, do you have the "old" style membrane DV? I'va the same care/engine/my and I had this membrane style DV - and this membrane got destroyed - so it won't seal anymor, making some crazy noise :-(

I have piston style DV, the proper D revision. The problem is, that the car overboosts. I have increased KFMIRL (in pair with KFMIOP) couple of times and it doesnt stop it from overboosting. Strange thing is that the current load doesnt reach specified load, which makes me think that something is limiting the load.


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If actual is not reaching specified KFMIOP and KFMIRL have nothing to do with it...

Please share the normal logs with problem.

@olobolo1996 - is the software original or did you already changed some maps?

I noticed my first post was a bit messy- sorry for that, lack of time.
The car is Audi TT with hybrid K03 turbo, 3inch custom full straight exhaust, custom intake and bigger intercooler. Below is log from my run today. I made second log with WOT, but it failed to save. Anyway under WOT there is solid 1,4-1,5 Bar of boost and no issues. The problem happens under 20-30ish % of pedal as you see on the logs. There is overboost condition. That is why I have been increasing KFMIRL (and decrease KFMIOP) couple of times. There is still issue with this range of throttle especially in 1500-3500RPM. My DV is screaming and then the car goes into limp mode. As you see in the log file, specified load has big value, however actual load stays very low. LDRXN and KFLDHBN are increased so they do not cap the load. It all makes me think that:
1. There is something more limiting
2. I messed up some map.
In addition I made KFLDRL and KFLDIMX map first and haven't changed it since I started adjusting KFMIRL. I am trying to adjust KFMIRL to KFLDRL and then make some small fixes to the KFLDRL, but maybe it is a wrong attitude.

What SW version is your ecu? Can you tell mit SW & HW Number- maybe i can have a look.

I'd got an K04-64 with downpipe, large intercooler, S3 Injectors and stock intake. I go for 1.3bar at most - more is not hadleable by the front tires. I've absoulutely no overboost at any time, because in my opinion a very smooth build up of boost is ways faster for a front wheeler, than that tdi style overboost, which just makes a pair of black stripes.

Also helpful, to post your file.

My SW number is 1037386455. Below there is my file. Can you take a look at it and tell me if it is ok?

https://drive.google.com/file/d/1ZMYURrYh0cf_1ByQWvCgqMVyIA1_m_3o/view?usp=sharing

You are changing random maps without understanding what they are doing.... You are going to get nowhere with this approach.
Start from basics.

Flash stock and don't make random changes to random maps. Your modifications look like 3 year old baby playing with keyboard :(

Well, I have read S4Wiki couple of times, I have been through many posts here, I do what they are doing, but it makes no change in the way I want it to. Maybe, some more detailed hint?

You might have massive torque intervention due to raping all the torque control maps.
Put KFMIRL and KFMIOP to stock, you don't need to touch them at all for this.

I thought I would need to increase the load KFMIRL to allow for the bigger boost pressure.
Where is that intervention from? KFMIOP? LDRXN? Stock KFMIRL is up to 176%. Is it enought for the 1,5Bar of Boost?
The S4Wiki says that the load*10+300 gives us manifold absolute pressure
For 176% it is 2060 which is around 1Bar of Boost.

Maybe it´s a mix from everything? ;)

Hybrid turbo, wastegate spring, compressor surge, wrong map-sensor, etc. and a mixed up file? :P

I would start with a "common" setup and start with some BHZ / CDL file.

What is the benefit from "K03 hybrid" to a standard K04?

My stock turbo was leaking some oil and to big play on shaft. Instead of refurb I went for hybrid. Small difference in price, much better result. It has stock wastegate spring, the MAF sensor was working pretty well under previous tunes in my local workshop, so I guess it is ok.

Anyway you know that there is a limit with BWA map-sensor? Wastegate spring is stock, and adjustment?

When did these problems occure? You only change the turbo compared to older setup which was working fine?

I’ve just read that stock BWA/AXX map sensor has limit of 1,5Bar. Today I will put KFMIRL/KFMIOP values from S3 file and I will try to adjust KFLDRL and KFLDIMX also using values from the file.
In my previous setup I had intake and exhaust modified. It was working perfectly. In this setup I changed turbo and IC. The turbo had harder spring and my tuner could not tune it so I decided to change the spring to stock and do it on my own cause I’ve always wanted to learn it.

Okay, so I've adapted KFMIRL and KFMIOP from Audi S3 and tried to adjust it along with KFLDRL and KFLDIMX. The ride is very smooth and nice up to around 20% of throttle pedal position. After that it starts to overboots hard and the DV starts screaming. I've made some logs and tried to investigate the problem. Here is my path of thinking:
1. I've logs, uploaded to the malone log viewer and found place that I want to fix
(https://i.ibb.co/Fg4LL0z/Zrzut-ekranu-2019-10-25-o-23-17-46.png)
2. I've opened KFPED map and found out that for given RPM and %PED I should get around 25% of torque request.
(https://i.ibb.co/92R24QQ/Zrzut-ekranu-2019-10-25-o-23-20-25.png)
3. With that information I've opened the KFMIRL map and found out that for given RPM and Torque request, ECU should request around 90% of load which according to S4Wiki should be something like 1200mbar of absolute pressure(90*10+300).
(https://i.ibb.co/XxVC7kS/Zrzut-ekranu-2019-10-25-o-23-33-37.png)
4. Moving back to the first picture (log screenshot)- the values of actual load and specified boost are way off from what they should be. Why is that? Take note that in this situation N75 is 0, so I can not lower the boost anymore, that is why I want to increase the specified boost so the ECU does not make the car get into limp mode allow me to drive normally.
Attached you can find my current ols file and log https://drive.google.com/file/d/1stPKhMaolB7t_GSQ3FH0hgxUYbekU8KG/view?usp=sharing
https://drive.google.com/file/d/1qe_r9HHpb3m-O7DCI0RF6YVh07YRAjyL/view?usp=sharing

This should be in noob section, you have no idea what you are doing.

Stop raping torque control maps with zero understanding, you will get nowhere.

You lack fundamental understanding of engine control, and your car most likely has hardware issues.

Can you tell me exactly what is wrong in more detail?

In the only log you posted there is no issue whatsoever with boost control.
If you don't want to hear anything, fit the stock airbox instead of a cone filter that you probably have.