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N249 delete?

Discussion in 'A3/S3 Forum (8L Chassis)' started by Colly, Jun 2, 2012.

  1. Colly
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    Colly The Tangerine Machine

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    can anyone tell me the advantages of the n249by pass?
    also whats the point in it?
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  2. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    Check the stickies mate its covered in there
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  3. Gops
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    Gops 6th gear @7000rpm

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  4. marty.h
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    marty.h Member

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    just done mine here is a pic showing it have much better throttle response



    [​IMG]
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  5. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    The N249 bypass achieves a few things... it tidies up and removes a lot of pipes that have the potential to split and leak, improve the DV's response on lifting the throttle and generally clean things up especially if you are looking to tart up the engine bay a bit...

    That said... bypassing the N249 then removes the ECU's ability to dump boost if it thinks there is an issue somewhere... N249 intervention tends to happen more on mapped cars than std ones... if bypassed and the ECU tries to dump boost (it will also throttle cut to an extent too) but can't due to the N249 not being in control of the DV then you will see a 'N249 mechanical failure' fault code...

    The ECU also uses the N249 to improve part throttle response IIRC... not sure to what extent as my car has not been std for some time but the effect varies depending on circumstance and level of tune...

    If you don't have to by pass it then there is no real advantage to it but on higher power stuff (bigger turbos and hybrids) then generally its binned off :)

    <tuffty/>
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  6. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    Tuffty you really are an 8L Guru i bow down to your wisdom

    So may well hold off removing mine for now and just do the B5 V2 Tip instead
    #6
    vivalacoulter likes this.

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