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bov and mbc

s4 osh May 4, 2009

  1. s4 osh

    s4 osh Member

    right so why is it not good to have a blow off valve, i know some hate the things, so except the chav status whats the other reason not to

    and manual boost controller, if i was to ditch the n75 how can i dissconnect it without the computer spazing out, and any reccomendations on wich one??????
  2. jcb

    jcb Active Member

    your MAF dependant ECU factors in the recirculating charge into the fuelling equation and can run way off if you vent the charge to atmosphere.
    if you want to run any other kind of controller without the ECU "spazzing out" diconnect the N75 but leave the electrical connection plugged in.

    but honestly, hiking boost, tricking the N75, cranking wastegates etc etc withithout an appropriate remap will leave you lean and kill your turbo or engine or both eventually.
  3. Blue_Thunder

    Blue_Thunder Well-Known Member

    Get it sorted before you think about modding it!

    Oh, drew a blank with finding the details of the guy I bought mine from in Anglesey.
  4. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    I wouldnt be putting a manual boost controller anywhere near an S4 engine...

    Firstly the ecu will instantly cut the fuel if you boost any more than stock anyway.
    Secondly, if it cant control the boost curve the way it wants to, you'll end up in limp mode.
    Thirdly, if you do get it wrong and put some speed holes in the pistons or blow the turbos, its a very expensive fix!
  5. s4 osh

    s4 osh Member

    cheers guys, thats really great info will steer clear of the mbc, and no mods are going anywhere near the car until its sween as a nut, dont worry im not a dim whitt haha
  6. andybnwc

    andybnwc Member

    I run a mbc parallel only to stop boost and limp mode until fueling and remap is done hopefully in the next few weeks i run low boost just for peace of mind really . But yeh just running a mbc to over boost is not a good idea
  7. joe_audi1.8t

    joe_audi1.8t New Member

    i have a mbc on my car leave the n75 in with it still plugged in and connect the two pipes to ur mbc mine seems to be fine holding 1.2 bar.
  8. Nez

    Nez Member

    I have get a dump valve on my S4 and its atmosphere and my car is only putting 249.1 BHP meannig its not good to run a dump valve on S4 at atmosphere :)

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