Nice info. Actually yes I remember this car.
And this car had about a million mechanical problems, from which many were fixed by us, but not everything.

A small list from things I remember:
* No fuel pressure
* Non functional boost control
* Wires (or fuel lines) going straight over exhaust manifold and would have molten down
* ETC

Did they tell you that 800 EUR included diagnostics, new fuel pump, changing it, new wiring, solenoids, pressure sensors and so on? I guess not. I did not even start to tune the car, only made it run with bigger injectors, set WGDC to 0 and gave it back as-is, because it had more issues. If it made 300hp like that without any tuning then good for them.
They did not want to pay me for work that the car needed (because 35 EUR per hour is so expensive for them), they said they want to fix everything themselves - I charged them dyno fees as well, as I had no idea if they will ever be back and said I'd subtract that if they are back in the future. Which they weren't.
The final log I have of this car shows it didn't make any boost - 90 WGDC, 0.7 bar boost.
I am not in the business to make mechanical repairs to cars for free.

Before you come and tell bullshit stories that you heard somewhere, make sure your information is actually correct. Because right now you are straight up lying. I have the invoice and the logs to prove it. You probably have not even seen this car.
Absolutely nothing wrong with my reputation over here either. The only thing is, that I am not cheap and I don't take jobs that I can't do right.

Btw I have a lot of clients from your country every year, especially for more difficult projects, because no one can do a proper job.
But it is funny to see that you come up with fabricated stories and personal attacks to cover somehow for the fact that you don't know what a PID is never mind how torque and primary/secondary load work in ME7.

Amazing... Claiming one of the most experienced members here has no clue 

God help yourself if you think you can do the job better than Prj!

Also, he clearly stated what needs to be done... Even after you started giving him shit, can't say fairer than that...

As I said - when the car left it did not make boost with CWMDAPP set to 8 and KLDRAPP set to 90%, if you want to be technical.
Client did not want to pay to look into it. So I did not. I charged for the work already done, and off they went.

As for everything being perfect on that car - far from it. The fuel pump was fitted by amateurs, just dropped at the bottom of the tank sucking in sand. That is why the pump fitted to it died before the car could be even tuned.
The wiring was shocking. There were things literally against exhaust manifold. One dyno pull and car would have burned down.
"They make these engines every day" - yeah right.

Fact of the matter is, those guys were super abusive, did NOT want to pay their bills after they brought car that had a huge array of faults and did NOT want to have it finished.
As I already said - I don't work for free, maybe you do, but I have better things to do with my life.

Clearly the tuning was the problem here:

No idea why there was no boost because the customer did not want to pay to find out and preferred to collect car.
Anyone who knows anything about tuning ME7 (I guess not you) can look at above screenshot and see for themselves that it is a problem that has nothing to do with the ECU, which you are referring to.

Sure, it was booked for a couple days for dyno tuning. Instead it needed two days of work to fix issues and my calendar was full with other work, like it is every summer. So I put it on my calendar to next free available date.
My shop fixed the screwed up wiring, changed the fuel pump, fixed the mess and damage in the fuel tank. This is what they were charged for + some dyno time because it is not my fault I get non-functional car.
Do you have reading comprehension problems? Do you think fuel pump is free? Do you think fixing someone's butchered wiring is free? Do you think fixing someone's destroyed fuel tank innards is free?
Do you think that 16 hours of work + fuel pump for 800 EUR is expensive? What is the problem exactly?

If you don't have money, then don't bring me the car to work on, simple. Find "Vasya" in garage who makes shit for 10 EUR/h. Like you

IMO that is definitly on the expensive side, but then again it depends on the country and quality of work done.

then its cheap , there is no way around it.

Yeah this, if it doesnt make boost, you either have a massive leak in intakepiping, or WG is stuck open aka doesnt let turbo build boost, or turbo is messed up.

Ah aight.