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Audi s3 boost pressure

Discussion in 'A3/S3 Forum (8L Chassis)' started by Coless3, Feb 21, 2013.

  1. Coless3
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    Coless3 Member

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    Just want abit of advice really logged my requested and actual boost and at 6370rpm this was in fourth gear full throttle, request boost pressure was 2.4bar and actual boost pressure was 2.1 bar.

    So far I have checked maf voltages, n75 solenoid valve resistance (32 ohms) got my hand on the actuator and the rod feels tight and also have had a smoke test done. The smoke test didn't being up any leaks.

    I have checked for codes and there aren't any on my car.
    I have a stage 1 revo remap on an audi s3 facelift, green cotton air filter and forge 008 recirculating valve.

    Is a 300mbar difference normal?
    Has anyone got any other ideas of what else it could be?

    Thanks in advance
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  2. Vwdan80
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    Vwdan80 Member

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    Are you sure it was 2.4 bar?? Probably worth posting the complete log on here so someone can help more :)
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  3. Coless3
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    Coless3 Member

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    Yes requested boost pressure was 2.4 bar..? Don't have the full log.
    Does 2.4bar sound wrong to you?
    #3
  4. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    You need subtract ambient pressure from the VCDS reading which is typically about 1bar (1000mbar)...

    <tuffty/>
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  5. future
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    future Scuderia Vittoria Edition 001

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    as has been said the ambient pressure needs to be subtracted first.

    This could be a dirty/old map sensor if there are definitely no leaks? Have you checked the turbine wheel for play and movement?
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  6. Coless3
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    Coless3 Member

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    Cheers for that didn't think about that stupid me.
    Is the turbine the side at the bottom of the turbo intake pipe? Should there be no movement at all?
    Where is the map sensor located? Can you test the map sensor?
    #6

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