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Track car issues - help required

Discussion in 'A3/S3 Forum (8L Chassis)' started by S3 TAM, Sep 25, 2012.

  1. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 25, 2012]
    Morning All,

    As some of you know me and bigcheese have been working on a track car this past year.
    It’s a Seat Ibiza Cupra. It’s finally back together but having a couple of issue’s at the min and need some assistance.

    On a test drive it was boosting fine, all of a sudden boost drops off. Running on actuator 5 PSI.
    Thought not a problem N75 died, limped home replaced N75 with new one still no joy. Scanned with VC. Fault code N75 related. So we checked the wiring and found a small split in the plastic coating near the N75 connecter.:sob:

    1. Would this be enough to cause issues?

    The split is too close to the connecter to repair so I will need to source a new connecter.
    I noticed the EVAP canister connecter is the same so I’m thinking to cut the connector from there are replace with a resistor.

    What do you guys think? Is this gonna be ok or should we get a connecter from somewhere else.

    On to the next issue BRAKES…..

    We replaced discs and pad’s all round, removed all the callipers and changed brake lines.
    We have to replace one of the HARD brake lines from the ABS unit as we f***d it up when trying to remove the old lines.

    We bled the system flushed about 2Ltr of fluid through but the pedal is real soft /spongy.

    Do we have to bleed the abs unit? If so how do I do it with vag com? Whats the process?


    Cheers in advance....
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  3. StaceyS3
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    StaceyS3 Well-Known Member

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    [Sep 25, 2012]
    Alright mate hows it going ;)

    The n75 wiring could be at fault if it's managing to short to ground or across the two cores? Also a possibility could be you've got a broken core somewhere?
    Pending what ecu you've got could be MAF related as Jay was having on off boost issues which turned out to be his MAF failing?

    With the brakes I had a simular issue when had the rear Calipers off and managed to drain most of the fluid in the system, I did have to use a pressure bleeder as well as pumping the pedal (slowly) as managed to get air in there, it took me 3-4 attempts at bleeding it over a couple of months (as well as a garage for my own sanity) after it had been done it would be alright and gradually get worse which always seemed after the abs cutting in, knowing what I know now would have used vagcom to bleed the abs pump but at the time didn't know to much and hadn't discovered this forum :)
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  4. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 25, 2012]
    pressure bleed until it works.. it can take a few goes.

    boost/n75 can be cycled from vagcom... ty that and listen for clicking. its under engine and output tests
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  5. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 25, 2012]
    Cheers for the info.

    Do you think I will have to bleed the abs unit as I've have the line off of it?
    #4
  6. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 25, 2012]
    perhaps cycle it, but pressure bleed should encourage the air out eventually
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  7. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 25, 2012]
    I did see a guide either on here or the Ross-tech website for using VCDS to do the abs.
    #6
  8. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Sep 25, 2012]
    #7
  9. Prawn
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    Prawn My other car is a MINI!!!!

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    [Sep 25, 2012]
    I had the same boost issues Tam, N75 intermittent fault code. All looked well.

    On stripping the wiring back, it had cracked and parted, yet under normal conditions the ends touched and contact was made and we had boost. Under full throttle the vibration / engine movement was just enough to pull the wires and lose touch. No boost.

    Have you bled the master cylinder as well for the brakes?

    By big cheese, do you mean Westy?
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  10. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 25, 2012]
    Lol no not me. It's his mate Pete. His name on ASN is Big Cheese.
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  11. Prawn
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    Prawn My other car is a MINI!!!!

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    [Sep 25, 2012]
    oh right, ACTUAL big cheese!

    You know, I just thought you were the big cheese around those parts westicles....
    #10
  12. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 25, 2012]
    This guy is bigger and cheesier then me :)
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  13. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 25, 2012]
    Again cheers for the input guys.

    Might seem silly to some but where is the bleed nipple for the master cylinder. Ive had a look around and cant see it on there. When it came to topping up the fluid there was none in there.
    #12
  14. superkarl
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    superkarl MAN OF STEEL

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    [Sep 25, 2012]
    i dont believe thats possible
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  15. superkarl
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    superkarl MAN OF STEEL

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    [Sep 25, 2012]
    its in there somewhere tam, 2 nipples, they are fairly tucked away and an arse to get to.
    ooo, hang on, its an ibiza, hmmmm.
    #14
  16. s3dave
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    s3dave TFSI Hybrid

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    [Sep 25, 2012]
    Disgusting Brute.....;)
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  17. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    Ok

    Ecu is now clear of faults.

    Still running on actuator......

    Rewired N75 seems to be working via vagcom.

    Did lots of logging. Noticed 12 degrees on all 4 as soon as u touched the pedal. Knock sensor was loose. There was a code for that. Now clear.

    At a bit of a loss as there are no codes now to diagnose the issue. seems to be running better but still only 4-5 psi.

    Forgot to bring the logs to work!

    Anyone got any ideas. Could the turbo be shagged?

    Its running ko3s stage 1, intercooler, 008p, full turbo back milltek, ie rods and so on....

    Bhp 156
    Ftlb 163

    Stats via block 115 last night.


    Edit MAF seems ok as well.
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  18. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 26, 2012]
    Tam, do you get a code by running the car with the N75 unplugged? It definitely sounds like the N75 is completely dead now. I cant think of any other reason why it would only run on actuator when is was able to boost more before you fiddled with the N75 :think:
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  19. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    Rewired it last night. Seems to work when u do output tests. We have 2 brand new N75's. but the fault codes have gone now.

    Its strange it feels like the remap has disappear because the car seems to run fine. Just lack of boost.

    I thought that the ecu was fried but it seems to work ok when using vagcom.
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  20. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    Heres a few pics


    ImageUploadedByTapatalk1348645317.131583.jpg

    ImageUploadedByTapatalk1348645402.956451.jpg

    ImageUploadedByTapatalk1348645427.267932.jpg
    #19
  21. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    I checked n75 duty cycle.

    It was 13.7% - 88.9%

    Which i think is ok
    #20
  22. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 26, 2012]
    You've definitely got the N75 pipework the right way round? If you unplug the N75 and start the car you should get a VCDS code about it. Be nice to see if this is still actually registering.

    Just trying to throw some ideas out there.
    #21
  23. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 26, 2012]
    what map is on the car?
    #22
  24. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    The car was bought with a remapped ecu.

    looking through the receipts this place did it The Phirm they do revo maps but it does not specify what remap was done!!! just stage 1.
    #23
  25. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 26, 2012]
    possible its switched to stock if revo... anyone you know have an sps unit?
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  26. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    Yeah i have one, i'll give it a go tonight any recommended settings?
    #25
  27. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 26, 2012]
    9, 9, 9 :)
    #26
  28. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    ohh yeah :rock:
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  29. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 26, 2012]
    boost 6 timing 4 for starters
    #28
  30. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    You read my mind!

    Will post up results
    #29
  31. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 26, 2012]
    Ok sps settings 6-4 hasn't worked.

    Really dont know what to do now.

    Unplug n75 like westy suggested error came up.

    Ahhhhh
    #30
  32. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 26, 2012]
    So it's detecting that the N75 isn't plugged in which is good as it suggests your wiring is ok. Have you tried one of your other N75s yet? Hoses are on the right way yeah?
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  33. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 27, 2012]
    Success

    We have boost.

    We did the following...

    • removed boost hoses and refitted
    • removed and cleaned MAF
    • swap the connector from the evap canister to the N75 valve. i.e. rewired both.
    • removed and reseated ecu connectors
    • unplugged and re-plugged any connector visible from lambda to AIT sensor.
    not sure what cured it...

    Don't think it has a Revo map on it as changing settings didn't change boost/performance.

    Did notice it is pulling lots of timing check out the logs/graphs

    [​IMG]


    [​IMG]


    [​IMG]
    #32
  34. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 27, 2012]
    Good work bud. Late night mechanics FTW.

    That is some mad timing pull! Also the "actual" boost is doing strange things! Up and down like a tarts draws! Think Pete needs to get it remapped.
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  35. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 27, 2012]
    I know the actual boost is mental.

    not really sure what to do about the timing pull as unable to change anything because its not a Revo map.

    has anyone got any ideas.

    could I change the degrees in unisettings or is that not advisable?
    #34
  36. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 27, 2012]
    You could scale down the boost in unisettings. Remember I had to do that to my car once the new K04 was fitted? Should hopefully bring the timing down a bit. Other alternative is to run on actuator pressure till its remapped.
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  37. S3 TAM
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    S3 TAM Pocket now empty

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    [Sep 27, 2012]
    Someone is selling a revo mapped ECU from another seat ibiza cupra.

    if bigcheesey gets it will it be a straight swap. i.e. don't have to worry about immobilizer?

    or will it have to be recoded if so is it poss with vag com
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  38. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Sep 27, 2012]
    I don't think it's as easy as a swap. I'm sure the ECU is coded to the car dials and IMO but I'm sure someone will be able to tell you for definite.
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  39. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    [Sep 27, 2012]
    If it's wired up the same way as Audi's, which I presume it is, then it's not a straight forward swop, the immobiliser would be a stumbling block.
    #38
  40. S3 TAM
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    [Sep 27, 2012]
    yep your both right just been reading about it.

    basically it's cheaper to go and get a new map i.e. revo/bill

    with out the correct gear and knowledge £££££££
    #39
  41. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 27, 2012]
    ibiza just needs to be coded to clocks in vagcom
    simple 2min job
    #40

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