NefMoto

Hi. Recently I began facing this problem: insufficient turbocharging.
I've got original ABT chip (1.3 bar), and during the winter the pressure was alright, it held the claimed 1.3 with no problem, but by the end of April the pressure dropped down to 0.9 and it only slowly escalates to 1.2 at 5500-6000rpm on 5th and 6th shift!
Logs show that 115th group requests 2300mbar@3300 rpm,the engine gives only 1980 a maximum.
Also, i experienced the (Check Engine) error 17965 - boost pressure control output exceeds the control range (higher than the upper limit), but what's interesting is that it only shows itself after 60-90 minutes of the engine off. When I approach any red traffic light, I just restart the engine and it continues operating normally with no errors, and doesn't fall back into "Check Engine" state during the ride.
What's replaced:
1. N75 valve (took the one from a TFSI)
2. Charge pressure sensor (new)
3. N249 valve (new)
4. Bypasses
5. Camshaft chains (original)
6. Throttle
7. Detonation sensors, new, original, tightened at 20N force
8. All new lambda-probes (exhaust sensors)
9. AEM 50-1000 gasoline pump, replaced in February
10. Changed the accelerator pedal, no effect
11. Air Flow Mass Sensor - I have 3 new identical parts, all three change nothing
Did not replace:
- ignition coils (no, we tried replacing them but it had no effect and we returned the old set back)
- spark plugs (they're still looking awesome)
- N80 fuel tank vent valve
- gasoline filter
- switches (commuters)

About the turbines themselves:
1. Hoses for the wastegates are pressure-tested
2. Turbines are alive and in a great condition (it easily gains 1.6 bar when I detach the wastegate hose)

Engine totally is in a nice shape, doesn't burn oil and operates with no suspicious sounds.

Audi S4 B5, the engine code is BES

What maps did you change to accommodate the N75 valve from a TFSI?
and why did you change to a N75 from a TFSI?

I didn't change the card
In Russia everybody uses those for valves
t just the same on functionality, but costs cheaper
I have changed the valve after this mistake began to appear

They might be mechanically the same but flow might be different.
Have you tried new stock N75 valve?

Have you leak tested boost piping?

No, they identical, our cars 800 HPs go by TFSI
At me 4 such N75 valves change nothing

Pressure tested
No leaks

Post some logs with me7logger of some decent pulls,
then it will be much easier to diagnose your problem :)

I have Logs 115 - 114 groups
I can send to an email

1 - when she went well

2-pressurization and consumption of air when went well

3-Nadduv and opening of wastegates 115 - 114 group already insufficient turbocharging

4-Pressurization opening of wastegates and temperature of an admission when insufficient turbocharging

Can't really tell much from VCDS logs.
The "pulls" have 5-15 data points and not enough sets.

A 3rd gear pull from as low as you can to redline. Full throttle.

But i can tell you that it doesn't request 1.3 bar for very long.

Are you on stock turbos?

Yes,stock turbos
Yes I know that  the Logs of a curve, will change turbines for new now and I will write down the log anew if of course the problem doesn't leave

At present I have a problem with the turbine because of low-quality oil

That is a pretty sweaty turbo.
How much shaft play do you have?

Bad Mobil oil ((
I have so understood you about the free movement of a shaft of the turbine
last time she was very close to walls

It's fine if the compressor is close to the walls (if it's within spec), That's part design.
But, it should never touch the walls, but have enough room to expand when hot.

But if there is a lot of play in the shaft, that's a sign of a turbo on its way out.
That might contribute to your underboost problem.

But can't really specify better, without some decent logs with me7logger.

I want to change turbines on new next week
Have sent me the new Audi Rs4 B5 engine, I want to use this while I wait for other motor

For the last time, get proper logs.

Obey the forum rules.

I have written that I will be able to write down the correct Log only after I will replace turbines!

Today I have read mistakes and I have received
17965 — pressure Regulator наддува:выход from regulation range (it is more than the top limit)
16490 — Pressure on an air intake/pressure => (G71/) F96 a doubtful signal
16621 — the pressurization pressure Sensor too low level of a signal
17956 — the Electromagnetic valve of restriction of pressure of pressurization-N75 break of a chain

Sound like either you MAP and N75 are trash,
or your engine loom has problems?

Yes, it seems to me too that problems with tubes of turbines (I think that tubes where that have come off)
On the street to look it hasn't turned out, we have cold-37 degrees, will go to a garage tomorrow if it turns out I will write down Log