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N75 valve problem

benashley Apr 26, 2014

  1. benashley

    benashley Member

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    I have an S3 APY engine code and I seem to be having some N75 valve related issues.
    The problem im having is that current my car seems very sluggish between 2-3k rpm and the power seems to fluctuate very slightly then at 3200 rpm I get boost all of a sudden. If I unplug the N75 valve I get a nice constant boost delivery from 2.3k ish.
    I swapped my N75 valve for one that I had laying around which was good when it was removed around 8 months ago. The car boosted much faster and harder and there was a noticeably more boost than before but at 3k the boost started to splutter badly then clear after.
    The N75 valve originally on the car is a 06a906283e and the one I replaced it with was a 058906283f.
    After doing some searching the F type seems to be the one I should have but I cant seem to find anything about the E type (or at least not with the same part no.)as to whether its the correct one for the car.
    Any help would be much appreciated. Thanks
     
  2. Gops

    Gops Badger 5 Edition VCDS Map User Gold Supporter Audi S3

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    06a is the one you need I'm sure..
     
  3. Joshstan

    Joshstan Member

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    I am running an E revision n75 on my s3 APY and it gives me no problems at all and was running the very same one on my AGU golf
    I think the differences are very slight it is basically an on off switch after all
    As to loosing power in the rev range I would first off scan the old girl for fault codes
     
  4. benashley

    benashley Member

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    Are you sure? Everything I have read seems to suggest I should have an F type.
    I think what im experiencing is compressor surge with the F type N75
     
  5. Freeman_1986

    Freeman_1986 Member

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    I thought it was in my head....

    But I broke the 06e one and replaced it with the revision. And now it doesn't feel as quick...
     
  6. benashley

    benashley Member

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    So you had an 06a906283e one on yours? What did you replace it with?
     
  7. Joshstan

    Joshstan Member

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    A little bit of research suggests the standard is a C revision and the F revision being a direct update from that so basically we should have c or f a little more digging results with the J revision being suggested as an upgrade
    Now my head is spinning lol
     
  8. benashley

    benashley Member

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    Lol apparently they all deliver boost slightly differently?
     
  9. benashley

    benashley Member

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    06a906283e is apparently the latest revision of the C/F type.
    I checked for fault codes aswell and the only fault I have is the incorrect flow fault from having no sas
     
  10. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Scanned for fault codes yet? don't assume the N75 is at fault especially if its giving you boost after its alleged 'hiccup'...

    The N75 is most likely doing as its told... you need to log the car to confirm...

    Its plausible that an over boost problem has happened and the ECU has cut N75 duty and dumped boost to protect the engine then brought it back in again hoping the issue has cleared..

    Unplugging the N75 electrically doesn't prove its faulty...

    Is your car mapped? do you have a boost gauge? what boost are your seeing if so?

    <tuffty/>
     
  11. benashley

    benashley Member

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    No fault codes except incorrect flow fault from sas delete.
    The car is supposed to have a stage 1 map but there is no proof of this.
    The car has had new coil packs(Bosch), New Bosch MAF, New green water temp sensor(genuine), full service with new plugs (BKR7E) and a new Bosch lambda sensor. All within the last month for various reasons. Also has had all the usual stage 2 stuff FMIC, 80mm TIP, 3" system with milltek rear box.
    But the problem has been there since I owned the car (before the mods).
    I have also pressure tested everything from the throttle bodie back to the TIP and there are no leaks anywhere.
    Now im ready for stage 2 map I thought I should try and cure it but maybe it just needs mapping?
     
  12. benashley

    benashley Member

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    I dont have a boost gauge fitted and im unable to log as my laptop isnt working. I have the tourque app on my phone which displays boost etc. But I dont think I can log with it or how accurate it is.
     
  13. Gops

    Gops Badger 5 Edition VCDS Map User Gold Supporter Audi S3

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    Well my car has the 06a
     
  14. benashley

    benashley Member

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    Yeah I have since found that the 06a is the latest revision. Thanks
     
  15. benashley

    benashley Member

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    I should be able to do some logging by the middle of the week. What do I nedd to log?
    I have just spoken to the previous owner and apparently it was remapped by superchips.
    Went for a drive earlier and when you accelerate part throttle from 2k upto 3k you can feel the boost fluctuating
     
    Last edited: Apr 27, 2014
  16. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    003,115,118 worth logging
    AND
    002.020.118
     
  17. benashley

    benashley Member

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    Thanks. Want to get it sorted then hopefully to you for stage 2 ☺
     
  18. benashley

    benashley Member

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    Checked my fault codes again today and I got P0571 brake switch unplausable signal. My snap on solus pro also thinks that the brake pedal is depressed when it isnt. I doubt this has anything to do with my boost issues but I have ordered a new switch anyway.
    Laptop is now fixed so hopefully get time to do some logging tomorrow
     
  19. benashley

    benashley Member

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  20. benashley

    benashley Member

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    I think I have done it correctly but not 100%. I might get a chance to do some more later.
     
  21. benashley

    benashley Member

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  22. benashley

    benashley Member

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    Anybody?
     
  23. ShaunS3

    ShaunS3 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    Logging wants to be done in 3rd gear, 2000rpm right through to 7000rpm in one continuous boost......needs to be a very long, straight and clear road ideally (private of course ;) )

    Shaun.
     
  24. benashley

    benashley Member

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    Thats what I did above. Have I done it wrong?
     
    Last edited: May 2, 2014
  25. ShaunS3

    ShaunS3 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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  26. benashley

    benashley Member

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    Thats probably because I didn't stop logging as soon as I had done the run. I will try and do some more later but the people that know what there looking at with regards to the logging are allways really busy
     
  27. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    I dont open .zip files...

    post the raw data here with tags to view if you want them looked at
     
  28. benashley

    benashley Member

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    I tried that and it said it was the wrong type of file.
    I didn't mean to sound rude saying people like yourself are allways too busy ;-)
     
  29. benashley

    benashley Member

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    Attached Files:

    Last edited: May 2, 2014
  30. benashley

    benashley Member

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    second set 003-115-118

    http://i823.photobucket.com/albums/zz155/benrashley/Mobile Uploads/log6_zps1rinmrhs.png

    http://i823.photobucket.com/albums/zz155/benrashley/Mobile Uploads/log7_zpsufk1ax1k.png

    http://i823.photobucket.com/albums/zz155/benrashley/Mobile Uploads/log8_zpshn7be8ao.png


    which gave me


    Address 01: Engine Labels: 06A-906-032-APX.clb
    Control Module Part Number: 8N0 906 018
    Component and/or Version: 1.8L R4 5VT 0003
    Software Coding: 05610
    Work Shop Code: WSC 06313
    VCID: EED3A83AAA37886EF6F-517A
    3 Faults Found:

    17840 - Secondary Air Injection Solenoid Valve (N112)
    P1432 - 35-00 - Open Circuit
    17963 - Charge Pressure
    P1555 - 35-10 - Maximum Limit Exceeded - Intermittent
    16955 - Brake Switch (F)
    P0571 - 35-00 - Implausible Signal

    Readiness: 0000 0000
     

    Attached Files:

    Last edited: May 2, 2014
  31. benashley

    benashley Member

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    can do some more if needed. Thanks
     
  32. benashley

    benashley Member

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    Edited so you can actually see the pics. Thanks
     
  33. benashley

    benashley Member

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    Anybody? Really want to get this sorted. Thanks
     
  34. benashley

    benashley Member

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    Bump
     
  35. shan00ble

    shan00ble Member

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    What happened? @ 2480rpm
     
  36. benashley

    benashley Member

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    Which run? Thats around the point it starts to get kinda jerkie then clears just after 3k
     
  37. shan00ble

    shan00ble Member

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    First run. The flow seems to drop quite a bit ??
     
  38. shan00ble

    shan00ble Member

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    But may be because you let off the throttle and thus flow was reduced.
     
  39. benashley

    benashley Member

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    Yeah thats a gear change. Thats only there so you can see the headings for the columns
     
  40. shan00ble

    shan00ble Member

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    Aah okay... woops sorry
     

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