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A4 2.0TFSI Quattro feels underpowered

steveaudi Nov 1, 2009

  1. steveaudi

    steveaudi New Member

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    Hello,
    I recently purchased an A4 2.0TFSI Quattro and after driving it for a couple of weeks I think it feels a little underpowered as if somethings not working correctly. I compared it today with a similar car but without Quattro and that pulled really well in 2nd and 3rd gears whereas mine doesnt pull as hard. I guess that a bit of power is lost through the quattro system but surely not this much. At 65mph in 6th I put my foot down and not a lot happens just slowly starts to accelerate.

    Any ideas what could be wrong?

    Cheers,
    Steve
     
  2. 10blazin

    10blazin HYPERDRIVE NEEDED

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    Quattro does slow the car a little i suggest you get a remap ...you will be laughing then
     
  3. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    Might be worth getting the car on Vagcom to see if maybe you have a lingering fault thats holing her back.
     
  4. pjmspeedy

    pjmspeedy Dude, what's mine say ?

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    Could possibly be a faulty n75 valve. Plug vagcom in as already suggested to see if it throws any codes up
     
  5. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    I had the same problem. Same thing in 6th gear etc. It's the diverter valve in the turbo. It's only £40 odd quid from Audi. You need the uprated piston type one not a diaphramed one as these are what fail. The rubber splits and it can't hold peak boost. It's easy to fit if your competant with a set of tools if not it's worth buying frm Audi and getting fitted as it's only a half hour job. I had mine mapped by Jabbasport and it was still slow so they plugged in their vagcom and logged it wasn't holding boost. Once the new DV was installed it was unreal. It's a comon fault on these engines. It's important you replace valve if you plan remap etc. Hope this helps. Craig.
     
  6. tedster

    tedster New Member

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    where abouts in the engine is this diverter valve located im going to replace mine prior to remap.
     
  7. mike beech

    mike beech Member

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    Its located to the front of the engine on the airbox side of the engine bay attached to a hose coming directly off the turbo. There is a fitting guide on the forge website to fit the DV spacer and the actual Diverter Valve needs to be removed to fit this.

    The new upgraded audi one is miles better quality than whats fitted as standard.

    link to forge sheet http://www.forgemotorsport.co.uk/media/fitting instructions fsit valve.pdf

    different car once remapped as well btw
     
  8. mike beech

    mike beech Member

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    i'm a dumb ****, just looked at the info sheet, the DV is fitted to the turbo housing itself not a hose as I said. Its about a 30 mins job to do and the undertray needs to be taken off to access the relevant area. Its almost impossible to do this job from above.

    I had to do it twice because the forge spacer that I ordered was incorrect and was meant for the later DV
     
  9. 10blazin

    10blazin HYPERDRIVE NEEDED

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    I dont think its the dv mine is an a3 2.0tfsi and its faster than the a4 but serious im not overly chuft with the speed either but when i got a trial map , I was like thats better its got the kick it need's ....:rockwoot:

    I had a diverter valve leek and the revs were going up and down and the car was crud ...i could defo feel something was wrong so i think you would of noticed it ...You probably just need a map , Get it on vagcom and if nothing shows up dont get the valve changed till it breaks there's no point....IF IT AINT BROKE DONT FIX IT !!:friends:
     
  10. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    If the rubber on the DV is split it doesn't show on vagcom. Also they don't all run funny either as mine idled fine, ran fine but was just not producing peak power because of the leaking boost..:moa:
     
  11. shark_90

    shark_90 Member

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    They do show on VCDS if you log the requested boost vs actual boost.
     
  12. steveaudi

    steveaudi New Member

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    Just an update, it turned out to be the DV diaphram split. It got fixed under warrenty. When the audi tech asked what the problem was I told him I thought it was the DV and he dismissed it saying he had only seen one fail so I left it with him to diagnose, bit of a smile on my face when I got a call saying the DV had split. Anyway all done and its like a different car, pulls really well. Another plus point is they lent me a brand new TT convertible for two days while they were fixing mine.
    Steve
     
  13. cdco2

    cdco2 New Member

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    Any one know when Audi moved over to the improved DV, just sorting out swapping my 3.2 A3 for a07 plate 2.0 TFSI Quattro Sline Special Edition and Id like to know if its something I should look for.
     
  14. skiptowncat

    skiptowncat Well-Known Member

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    It must be a common thing on turbo cars, I had the exact same thing on my astra vxr.
     
  15. mo_mo

    mo_mo A4 SE S line 2.0T FSI

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    hi does anyone have the part number for the diverter vale, thanks
     
  16. hazey7

    hazey7 Member

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    Can't believe no-one has said respect to the Torque Terrorist for diagnosing the exact fault via an email. Well done lad.

    'Almost' a similar thing happened years ago on my Audi Quattro Turbo, big flexible hose between turbo and air intercooler had a slight split meaning that once the boost air gets to a certain pressure it leaks and you lose a load of power. Won't show up on diagnostics unless someone is clever enough to measure boost air pressure.
     
  17. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    Why thankyou!!
    I would just like to thank my family, my agent and all others who really came together to make this advice a reality! LOL
     
  18. mike beech

    mike beech Member

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    http://www.jkm.org.uk/performance/tfsidiverters.htm

    Link for the later audi diverter valve, scroll to bottom of page. These are only fitted as standard to B8 audi 2.0 TFSI's not B7's but a direct fit for all B7's.

    Someone else recommended this company to me and cant praise them enough, spoke to them on the phone a few times as well. Very knowledgable
     
  19. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    Picture of failed DV. Split in green rubber diaphram
    [​IMG]
     
    Last edited: Feb 13, 2010
  20. Sarge786

    Sarge786 New Member

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    Hi all, I'm new and have an A4 B7 2.0TFSi DTM.

    I have just got my DTM, however I have the following faults showing on VCDS, and I'm wondering if this is caused by the same valve as sometimes the revs start hunting a little, enough to notice it though.

    3 Faults Found:
    008583 - Bank 1; System too Lean at Idle
    P2187 - 004 - No Signal/Communication - MIL ON
    Freeze Frame:
    Fault Status: 11100100
    Fault Priority: 0
    Fault Frequency: 3
    Mileage: 46980 km
    Time Indication: 0

    Freeze Frame:
    RPM: 749 /min
    Load: 14.1 %
    Speed: 0.0 km/h
    Temperature: 81.0°C
    Temperature: 7.0°C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.224 V

    001287 - Idle Control System RPM: Higher than Expected.
    P0507 - 001 - Upper Limit Exceeded
    Freeze Frame:
    Fault Status: 01100001
    Fault Priority: 0
    Fault Frequency: 20
    Mileage: 46981 km
    Time Indication: 0

    Freeze Frame:
    RPM: 1041 /min
    Load: 14.5 %
    Speed: 0.0 km/h
    Temperature: 83.0°C
    Temperature: 24.0°C
    Absolute Pres.: 1010.0 mbar
    Voltage: 13.843 V

    008825 - Leak in Air Intake System
    P2279 - 002 - Lower Limit Exceeded - Intermittent
    Freeze Frame:
    Fault Status: 00100010
    Fault Priority: 0
    Fault Frequency: 2
    Mileage: 46981 km
    Time Indication: 0

    Freeze Frame:
    RPM: 905 /min
    Load: 14.5 %
    Speed: 0.0 km/h
    Temperature: 82.0°C
    Temperature: 17.0°C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.097 V

    Readiness: 0000 0000



    Any idea's?


    Cheers
    Sarge
     
    Last edited: Feb 13, 2010
  21. steveaudi

    steveaudi New Member

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    Just an update, the car is much better now. I have even booked it in for a Revo re-map on the 22nd so that will an interesting day.
    Steve
     
  22. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    It will be like all your Christmas's and Birthdays have all come at once! Its like a different car once mapped!
     
  23. sainte986

    sainte986 Vorsprung Durch Technik

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    I think that would be more down the it being a poorly built vauxhall
     
    geordiestig likes this.
  24. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    LOL
     
  25. steveaudi

    steveaudi New Member

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    Well its been remapped and all I can say WOW what a difference it doesnt feel underpowered any more. Ben at AV Performance did a top job.
     
  26. TorqueTerrorist

    TorqueTerrorist www.sprayplan.co.uk

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    See, we told you!! Lol Well done mate.
     
  27. goon

    goon Member

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    I fitted a boost gauge to my old 1.8t (about an hours work) and could then accurately monitor turbo output.
     
  28. giorgos

    giorgos New Member

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    i have same problem !!! audi b7 2.0 dtm ...
     
  29. Craig Cull

    Craig Cull Well-Known Member

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    I'd change the pcv and check all the vacuum pipes leading to it mate
     

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