Geringer Schub durch schlechtes membrane

[SamFM]

Entschuldigung für meinen schlechten deutsch. Ich werde auf Englisch schreiben und dann unten ins Deutsche übersetzen

So, I have MC2 Turbo. And it has low boost. I changed a lot of sensors, intake hoses, checked N75 and throttle switch, etc.
The only thing I haven't seriously checked is westgate diaphragm.

Could it be possible that due to cracked or broken diapragm I get low boost?

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Ich habe ein MC2 Turbo. Und es hat einen geringen Schub. Ich habe viele Sensoren, Ansaugschläuche gewechselt, N75 und Gasschalter usw. überprüft.
Das einzige, was ich nicht ernsthaft überprüft habe, ist das Westgate-Diaphragma.

Könnte es sein, dass ich aufgrund eines gerissenen oder gebrochenen Zwerchfells einen geringen Schub bekomme?

[matze]

How high is the Boot?
0,2bar or 0,4bsr or 0bar
WhatsApp say the error memory

[SamFM]

The boost is 0,2 (1,2 bar on display) at 3000 rpm and up.

Error memory is empty

[StefanS]

Hello Sam,
google Translate ist sometimes a funny thing.

The "diaphragm" in your car ist a "Membrane". -> "Wastegate-Membrane"
The "Zwerchfell" is a muscle-tendon plate which separates the thoracic and abdominal cavity in mammals.
It has a dome shape and is the main breathing muscle.

To get more Results in Search-Engines this may help.

Good luck solving the Problem.

Stefan

[SamFM]

Hello Sam,
google Translate ist sometimes a funny thing.

The "diaphragm" in your car ist a "Membrane". -> "Wastegate-Membrane"
The "Zwerchfell" is a muscle-tendon plate which separates the thoracic and abdominal cavity in mammals.
It has a dome shape and is the main breathing muscle.

To get more Results in Search-Engines this may help.

Good luck solving the Problem.

Stefan

Ahhaha =)

Thanks for the correction! Will do. I really tried to find as many info as possible.
As I did changed a lot of things, but my engine still has no power after 4000 RPM

[matze]

0,2bar is the Boot at emergency run.
Check after a run the fault memory.
Sometimes
The two Switches of the trottel
Overtemp switch n75
Knocksensors
Coulant niveau senso

[timundstruppi]

Check the points from user matze and the rubber tube between interlooler an engine at the downside.

Check the full throttle switch at the throttle. At 57°angle it have to close the electric contact.

The wastegate diaphragm damage will cause a overbost and a sudden fuel cut off by the MAC14 engine controle unit.

[SamFM]

Hi everyone!

Thank you for your replies! You are the best )

So, I haven't found the reason of low boost yet, but I've done a lot of diagnostics:

1) Membrane is OK. Just in case I bought new one from 034 motorsports but will put it later when I install 0,9 Bar chip
2) Throttle switch is OK. Tested it in different positions. Both of them work well.
3) Intercooler hoses are new and do not leak
4) Intercooler temperature sensor showed about 500 Ohm when cold. So, Ok.

The only thing is left - OBD computer diagnostics and to replace 2nd detonation sensor. 1st one is already new and was replaced due to the fault code from ECU. But I've read here, that maybe my remaining detonation sensor is also working incorrectly, just doesn't provide any fault code yet.

[timundstruppi]

Make "Stellglieddiagnose" like shown in the "Reparaturleitfaden".

Install a "controle" standard LED parallel to the conatct of the N75 (right polarity and a resistor with 500 Ohm in serie) So you can see the LED start to flicker if the Boost regulation will start at 57° trottle angel. But you must have no mistakes in the ECU. Perhaps the update of N75 is wrong or leak.

[SamFM]

Make "Stellglieddiagnose" like shown in the "Reparaturleitfaden".

Install a "controle" standard LED parallel to the conatct of the N75 (right polarity and a resistor with 500 Ohm in serie) So you can see the LED start to flicker if the Boost regulation will start at 57° trottle angel. But you must have no mistakes in the ECU. Perhaps the update of N75 is wrong or leak.

Did it - so the LED is blinking when the throttle is more than 2\3.
As for OBD Fault codes, will check it soon and write back a report.

I made an update like is written here but haven't drove the car since. =)
https://audi100.selbst-doku.de/Main/Opt ... f19BarChip

[timundstruppi]

hmmm?
Is the N75 working? Blow with rhe mouth at the air pins. THe electric will be OK.

Be careful with the LED a shortcicuit can damage the MAC 14. I forgot it to say...

[SamFM]

Hi guys!

Finally, I think, I'm getting close to solving my issue of low boost.
I had a 5000 km roadtrip just after new year. Most of the route was on a highway with 100-120 km\h cruising speed.
So, I noticed, that when I go full throttle, engine wouldn't go past 5000 RPM. And the sound of the engine changed a lot.

And then I remembered that I had my fuel pump replaced just after I bought the car. And by the BOSCH number I remember that it was 030 or something begining with digit "3". I assume that it's just too weak for my turbo engine. And also, my wiring is old and I guess, there's about 12V on the pump instead of 13.8-14.

So, next step, I will check the system pressure and change fuel pump to Bosch 040 or 044. Then I adjust the control pressure, as now I have 4.2 bar, which is too much.

By the way, can someone advice is it possible to check if the air-flow metering plate is topped out (reached maximum travel upawrds) while the engine is running?

[timundstruppi]

Realy only 4,5?
You need 5,8..6.2bar! I take alook at the RLF. page 25-33