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No Boost

Discussion in 'A3/S3 Forum (8L Chassis)' started by Danny Cawsey, Feb 23, 2010.

  1. Danny Cawsey
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    Danny Cawsey Cawsey

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    [Feb 23, 2010]
    Right ive just spent the last 4 hours fitting a forge TIP and a forge D,V relocation,
    but there is a sensor that goes into the N75 which now will not reach,
    drove it home from work which is 600 meters with out this sensor connected and there was hardly any boost.
    Im guessing this is due to the sensor not being connected?
    What does the sensor do?
    can i just cut it and add some cable to it?
    cheers Danny
    #1
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Feb 23, 2010]
    By sensor I assume you meant the N75 wiring plug???

    If you do then it kinda needs that to work hence no boost...

    <tuffty/>
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  4. Terrier QTS
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    Terrier QTS Member

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    [Feb 23, 2010]
    The N75 controls the Wastegate, so you're going to need it connected.
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  5. Danny Cawsey
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    Danny Cawsey Cawsey

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    [Feb 23, 2010]
    ok cheers for that guys will get some hose tomorrow and move the N75 so i can connect the wiring plug.
    #4
  6. OllieH
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    OllieH Member

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    [Feb 23, 2010]
    Do you mean the electrical connection that goes onto the N75? The ecu uses the N75 valve to control how much pressure is seen on the actuator, which in turn controls the wastegate of the exhaust turbine. With the connection removed, the N75 will not be working, so full pressure will be seen on the actuator, meaning the wastegate will open alot earlier than normal, hence your not getting any boost. Wastegates without any ecu control are typically set up to open at half the original boost level, incase of N75 failure, which is what yours is doing now.

    Personally I would not cut and extend the electrical connection, but maybe extend the TIP connection by adding a length of silicon pipe to it, bringing the N75 closer to the electrical connection.

    HTH
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  7. tankie2ndrtr
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    tankie2ndrtr Member

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    [Feb 24, 2010]
    Have you tried.

    [​IMG]
    #6
  8. Danny Cawsey
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    Danny Cawsey Cawsey

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    [Feb 24, 2010]
    reconnected the n75 today and ate a boost bar now shes running fine again..
    #7
  9. jonny87
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    jonny87 Active Member

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    [Feb 24, 2010]
    oooo you eat the boost bar, i was jamming mine in the turbine housing :wacko:
    #8

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