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Difference between N75 and N249

Discussion in '(Archived) Engine Discussion and Tuning' started by blackturbo, Dec 12, 2009.

  1. blackturbo

    blackturbo Full Member

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    Firstly please excuse my ignorance on this subject :blink:

    Vagcom'd my car today as the engine management light had come on and got two fault codes.

    One being to check the DV (which I already knew had split and a 007p is on order.

    Second one was a N249 mechanical malfunction. Now the car is a 1.8T Bora running a KO3s and an N75F valve.

    I swapped the N75 for an N75C that I had kicking about and this appears to have cleared the fault code.

    So what is the difference between the N75 and the N249?

    And anyone happen to know which version of the N75 the 1.8T 150s should run as standard?

    Thanks
     
  2. csd_19

    csd_19 Full Member

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    The N75 valve is what controls your boost level via the wastegate.

    The N249 is used to open the DV - not just when you lift off but if the ECU deems it necessary i.e. in conjunction with TC. That's why there is a black vacuum canister on top of the engine, so the ECU can still open the dv when you have your foot down.

    The N249 fault code you had was directly related to the split DV. With it split the DV was no longer functioning properly, and the ecu recorded a fault with the operation of the N249 which should be controlling the DV!
     
  3. blackturbo

    blackturbo Full Member

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    Ah cool, thanks for letting me know ! Many thanks :)
     

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