1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Can I fit A boost Controller on My S4

Discussion in 'A4/S4 forum(B5 Chassis)' started by AudiPete, Oct 30, 2006.

  1. AudiPete
    Offline

    AudiPete New Member

    Joined:
    Oct 15, 2006
    Messages:
    6
    Likes Received:
    0
    [Oct 30, 2006]
    Hi, I was Just wondering if its posseble to fit a boost controller to my 1999 s4, Its allready chipped but I just need more power..
    #1
  2. Ads

    Ads

    [Sep 23, 2014]

  3. macca
    Offline

    macca Member

    Joined:
    Sep 6, 2006
    Messages:
    525
    Likes Received:
    0
    [Oct 30, 2006]
    i think the chip you have needs to be modified to disable the electronic boost control valve and have any boost limit removed or made higher so that you can use an adjustable boost controller. might be able to get a more aggressive chip mapped in. becareful though, don't want the engine to go "pop".
    #2
  4. AudiPete
    Offline

    AudiPete New Member

    Joined:
    Oct 15, 2006
    Messages:
    6
    Likes Received:
    0
    [Oct 31, 2006]
    Does my s4 have an electronic control valve to control the boost, And if so can I bypass it, And if the turbos went pop thats not too bad, But the engine Omfg, I've had an Nissan sunny gti-r and that run high boost and twice on the motoway it melted a piston and it melted the liner aswell :crying: New engine jobby.. Obviously it was running too leen
    on top end revs... NB. Now I just want to fit a manual bleed valve can I fit one of these just before the acuator :superman:
    #3
  5. dummi
    Offline

    dummi smoking a6

    Joined:
    Mar 25, 2004
    Messages:
    1,210
    Likes Received:
    0
    [Oct 31, 2006]
    standard k03's run out of puff toward top end, k04's are better, hybrids even better contact MRCtuning.com i'm having mine mapped by then after my rebuild is complete. also check rs246.com lot of s4 owners on there.
    #4
  6. macca
    Offline

    macca Member

    Joined:
    Sep 6, 2006
    Messages:
    525
    Likes Received:
    0
    [Oct 31, 2006]
    i think it is the same on the s4, but the a4 turbos have an electronic boost control solenoid which effectively is a bleed valve, these can be programmed to control the boost level, hence the remap ups the boost using this, along with timing and fueling. trouble is there is usually a overboost protection on the ecu which also needs to be raised, hence if you manually bleed, you may get a small increse and then it will cut out.

    main thing you have to worry about is your internal temperatures and fueling, the audis have knock sensors on them so i can guess they will try to limit pre-ignition as much as they can and prevent a piston melt down. next thing is the internal strengts of the rods etc, which i can imagine the s4 will still allow a bit more. personally (not being a s4 expert) i would look at getting the mapping changed to allow a bit more boost etc, this way it you are not trying to fool the ecu into thinking its got lower boost that it has really got.
    #5
  7. QuantumJohn
    Offline

    QuantumJohn Member

    Joined:
    Nov 23, 2004
    Messages:
    142
    Likes Received:
    0
    [Oct 31, 2006]
    Pete,
    If the turbos go it is not cheap. The engine needs to come out to replace them and believe me this is not a job to do in a single garage or on your drive!
    You'll probably looking at more than £2000 for someone to replace turbos, more if you want to go for larger units.

    John
    #6
  8. S4_dan
    Offline

    S4_dan Fire up the Quattro!

    Joined:
    Jan 5, 2006
    Messages:
    1,732
    Likes Received:
    77
    [Oct 31, 2006]
    There is a post on RS246 or Audiworld (cant remember which!) but it states that the S4 ECU is so sophisticated when it comes to controlling the level of boost etc and that by bypassing it and replacing with a manual boost valve you will actually loose performance rather than gaining any.

    Search the two sites for it, or i will post it when i have chance to look.

    P.S. take care of your turbo's! as already stated, not a good or easy job, nor cheap! to replace them!
    #7
  9. dummi
    Offline

    dummi smoking a6

    Joined:
    Mar 25, 2004
    Messages:
    1,210
    Likes Received:
    0
    [Oct 31, 2006]
    S4 dan is right there is no point in changing the from electronic to manual control you are simply not as fast as the ecu. as Macca said it has an electronically controlled solenoid to control boost already, one thing you might think doing since you are looking in that area is try a different boost control valve it is called N75 and if you search audiworld.com you will know everything you need to about the different varieties and be able to select/try the ones you want. they are the cheap easy mod ideal for people who like to fiddle under the engine without to much trouble. though really your remap should have optimised the boost levels maybe you should consider a more aggressive re-remap and your fueling and ignition will be optimised prevention against pistons melting and overboost protection

    HTH
    #8
  10. AudiPete
    Offline

    AudiPete New Member

    Joined:
    Oct 15, 2006
    Messages:
    6
    Likes Received:
    0
    [Nov 1, 2006]
    Nice One thx guys for all your help ..
    #9
  11. ZeroK66
    Offline

    ZeroK66 Member

    Joined:
    Jun 24, 2004
    Messages:
    256
    Likes Received:
    1
    [Nov 1, 2006]
    No point in trying to get more boost out of the car. You will just get less ignition timing, more chance of turbo failure, and probably less power too. Best power results from a map that I have seen is MRC map which runs LOW boost with high ignition timing customised to your car.

    Power is not all about boost. The K03's cant deliver and if you push them will go pop. Get the car checked over by a 2.7T specialist for boost leaks, check the MAF, the DV's - maybe get the pre-cats in the downpipes gutted and then it re-mapped to take advantage of this.

    MRC maps have been known to give 320BHP on a bog standard exhaust setup & up to 350 with NO CATS & a miltek system. You wont get anymore than that on a standard S4 motor with K03's.
    #10

Share This Page