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whats the diameter of a standard s3 maf?

Discussion in 'A3/S3 Forum (8L Chassis)' started by s3dave, Mar 26, 2010.

  1. s3dave
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    s3dave TFSI Hybrid

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    [Mar 26, 2010]
    as above as i seem to be only getting 189g on the liquid guage but boosts to 24psi on a stage 2????
    something is wrong somewhere ,,it goes like stink so im guessing i have a bigger maf and the values are out?
    :think:
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 26, 2010]
    If you are using the std air box then you have a std S3 MAF... they are nearly 3"...

    If you are only getting 189 g/s then I would imagine the MAF sensor is the culprit...

    <tuffty/>
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  4. s3dave
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    s3dave TFSI Hybrid

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    [Mar 26, 2010]
    cheers, im using a bmc , would you still see 24psi though?
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  5. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 26, 2010]
    Boost and airflow aren't the same....

    Can still make boost and have poor airflow.... take tyres... no airflow, 32psi... :)

    Do you know if the MAF has been changed and when that was?

    <tuffty/>
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  6. s3dave
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    s3dave TFSI Hybrid

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    i dont know, how old it is mate, i thought if it was boosting it has to be drawing air in at a decent rate, as like i say it goes fine...
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  7. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 26, 2010]
    Check for fault codes then do some third gear runs (using the MAF gauge on liquid) to see what max you get airflow wise... if its not around 200g/s or more then the MAF sensor may be the issue but I have seen engines being strangled by BMC type air boxes... the OEM airbox will flow 300bhp with no probs...

    <tuffty/>
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  8. s3dave
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    s3dave TFSI Hybrid

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    [Mar 26, 2010]
    no fault codes, will try 3rd gear runs cheers, the car is supposed to be running at 298bhp with the hybrid ko4
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  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 26, 2010]
    298bhp is a little 'happy' tbh.... most I have seen is 220g/s through a hybrid before now... that wasn't putting out anything near the power you suggest...

    <tuffty/>
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  10. s3dave
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    s3dave TFSI Hybrid

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    [Mar 26, 2010]
    :) could be.... thats a print out from apr after 4k of work :asskicking: with reciepts......luckily that was from previous owner last year
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