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Audi A4 B5 1.8T AEB Full Power Issue: Replaced K03s Turbine, N75, DV Valve & More, Logs in Gear 3

dareka44 11793 6
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  • #1 17328336
    dareka44
    Level 11  
    I wanted to make a program, unfortunately it turned out that Audi does not keep the series. It showed 137.5 km on the dynamometer. Replaced the turbine with K03s (cracked housing), replaced N75, DV valve, throttle because the old one did not want to adapt, candles, g31 sensor, Turbo charges to 0.6, the mechanic assured that the intake was tight. The damper opens up to 82 degrees. The engine is healthy, I do not add a gram of oil for 15,000, I go on mobil1: 5-40. I have had the car since 2003, before that, nothing was done on the engine and accessories. I also changed the fish ladder (new replacement), the car at 4600 revs had 147kph and 235nm, but then it dropped that at 5600 it had 130 horses. I put on the original that holds the serial 210nm but there are no horses.
    logs in 3rd gear
    https://log.malonetuning.com/chart/235512#H8K...nfDkGdNw6PDkMOGXVxWw47DvQDDvMOXwpUdw5AAAAA%3D
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  • #2 17329366
    Kantylena
    Level 24  
    Are you sure the intake is tight? With such a turbo and tight intake, the flow in the logs should reach a minimum of 140 g / s and here just 130.
    Turbo is 100% healthy, right?

    137.5 horses after 20 years is not a tragedy again, but it should be better, although 145-147 ..

    The problem may be the flow only ori Bosch, preferably with ASO or used and with the same number that sat there, no substitutes
    Because all types of Toprana are shoddy and the car will not run on it.
    In addition, it is worth checking the inlet with a compressor, punch in with a hose and inflate and see if it is escaping somewhere (high probability)

    It would be nice to check the logs from channel 25.


    Generally, there is no philosophy here:
    - flow meter
    - inlet leakage, negative pressure
    - DV
    - N75
    - wastegate (turbo)
    - fuel filter, fuel pump, pressure
    - probe
    - throttle
    - coils / candles
    ... it only affects the power.
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  • #3 17330193
    dareka44
    Level 11  
    Thank you for your interest in the topic.
    The turbine has barely come out of regeneration, it pumps well, checked on 3 different clocks. Theoretically, the mechanic claimed that the intake was tight, but I will choke him to test me. When the test turns out to be good, I will order a fish ladder, because it turns out that there is a problem here, the more that with the replacement, AEB had 147 horses already at 4600 rpm! So the changes were visible.

    I will write about the fate of AEB ;)
    best regards
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  • #4 17330234
    Kantylena
    Level 24  
    Ok, if the turbo is fully healthy, the rest of the trash is ok, the intake + flow meter is not set, as far as I know, the old 1.8T AEB / AJL or AGU are just basing their work on flow indications or something, so if something is lame here, this car it does not drive well, and by the way, I used to change into AGU and the mechanic absolutely ordered to buy the original with the same Bosch number, even a better stimulant than a new replacement.

    by the way, the turbo is stronger than the serial AEB, it should pump sharply and the power should be greater than the AEB series.

    What about the catalyst? is not clogged sometimes? It is worth inserting the so-called downpipe and then the turbo will clean sharply, generally after such a treatment, for example in headlands and changing the turbo to K03s, I do not remember what flow but the power is immediately ~ 165 horses from the serial 150 to K03 and without any chips, also a lot of it gives.
  • #5 17330707
    dareka44
    Level 11  
    Is the catalyst clogged hmmmm ... I also took it into account. The engine and turbine do not consume oil. My wife has been driving this car for 15 years and she has never tortured this car. In addition, the BRC gas installation, I think, cleaned the entire exhaust system to white ;) When the flow exchange does not help, I will check the catalyst.
    How did the change affect the sound of the mufflers? Once in my life I removed the catalysts in a6 c4 2.8. As quickly removed, so quickly welded. I couldn't come to terms with that exhalation sound
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  • #7 17452942
    dareka44
    Level 11  
    I removed the catalyst, it was practically like new. After that, the Audi lost 20 horses !! The bottom was practically gone. I put it back in. I changed the injectors, checked the fuel pressure. Everything is book-like. Equally to 11 bar on the cylinders. Audi currently has 0.6 bar in the lower range and full throttle, and in the upper range, i.e. 6,000 revs, it has 0.2 bar.

Topic summary

The discussion revolves around an Audi A4 B5 1.8T AEB experiencing full power issues after various component replacements, including a K03s turbo, N75 valve, DV valve, and throttle body. Despite these changes, the vehicle's performance logs indicate a drop in power, with only 130 hp at 5600 rpm, while the expected output should be higher. Participants suggest checking for intake leaks, ensuring the flow meter is original Bosch, and verifying the condition of the catalyst. The owner has replaced the flow meter and performed multiple logs, but the power output remains unsatisfactory. Further troubleshooting includes examining fuel pressure and injector performance, as well as the possibility of a clogged catalyst affecting overall power delivery.
Summary generated by the language model.
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