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  1. #1
    S3 Paul's Avatar
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    Finaly fitted my wideband AFR gauge...

    Well, ive had it a year now, i decided the weather was good enough for me to have a crack at fitting it,
    Im about to go out for a drive, What Numbers should i be seeing?
    The car has a hybrid turbo,
    decat 3 inch down pipe and miltek system,
    FMIC
    Jetex air filter
    other bits and bobs...
    I understand Vag cars run lean when starting to make boost whats safe and what shows a possible problem??
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

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  3. #2
    <tuffty/>'s Avatar
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    Normally go a bit lean to help boost but should then plummet to mid 12's (0.85 lambda) on boost for best/safe power

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  4. #3
    S3 Paul's Avatar
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    I think i read somewhere something about ...
    11.8 to 12 on boost?
    cruising should show around 14.7 to 15?
    high 12s on cold start??

    I think that was for a mapped TT so should aply??
    Just another gauge to make me paranoid !
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  5. #4
    <tuffty/>'s Avatar
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    12.5 afr on boost mate... any richer kills turbine energy and power will drop... should help keep egt's down too...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  6. #5
    <tuffty/>'s Avatar
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    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  7. #6
    S3 Paul's Avatar
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    Thanks buddy
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  8. #7
    S3 Paul's Avatar
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    Well something i didnt expect...
    When the car is on over run ( reving down in gear down hill ) the AFR reading goes to full lean. 22.4
    Im guessing the injectors shut off ? They come back on again at 1200 rpm or the slightest touch of the throttle.
    Makes sence but a little wierd the first few times it happens.
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  9. #8
    DaveA3's Avatar
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    so what were the other readings all good?

    Audi A3 1.8T Sport (AGU) - 2000
    Engine: Carbonio CAI/Jetex JR Hybrid Induction, Forge 007p DV, Forge TIP, Longlife S/S Custom Exhaust system, R-Tech Stage 1 Remap, Creation Motorsport Boost Pipe Kit.
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    For Sale PM ME - £2500 Mods Inc

  10. #9
    S3 Paul's Avatar
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    Ye, I will make a note of them later, But a mate who knows a thing or two about tuning turbo cars said its all good.
    Im not sure wether the figures should be the same on all cars but... good and safe will do me !
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  11. #10
    <tuffty/>'s Avatar
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    Quote Originally Posted by S3 Paul View Post
    Well something i didnt expect...
    When the car is on over run ( reving down in gear down hill ) the AFR reading goes to full lean. 22.4
    Im guessing the injectors shut off ? They come back on again at 1200 rpm or the slightest touch of the throttle.
    Makes sence but a little wierd the first few times it happens.
    Yep.... let off the throttle with the clutch engaged in gear etc and injectors switch off... the ECU does this to help fuel economy...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  12. #11
    camscockle20vT's Avatar
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    Quote Originally Posted by ;1385079
    Yep.... let off the throttle with the clutch engaged in gear etc and injectors switch off... the ECU does this to help fuel economy...

    <tuffty/>
    Do you know if this is on all the 1.8 20v T mate?

  13. #12
    S3 Paul's Avatar
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    I seem to think its only on the later drive by wire cars?
    I may be wrong though
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

 

 

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