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MBC 1.8t Working perfectly on remap

Discussion in 'A3/S3 Forum (8L Chassis)' started by clintonellis, Oct 30, 2012.

  1. clintonellis
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    clintonellis audi A3 1.8t AGU

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    [Oct 30, 2012]
    hi everyone ive got a 2000 model Audi A3 1.8t AGU , my car has been mapped to run 1.2 bar max and as is my car was running 0.8 max due to my N75 being faulty so this is the set up ive installed....dont ask me where i bought it as it comes off a vaccum machine and a MBC set will work just fine.


    photo(5).jpg photo(4).jpg photo(3).jpg
    #1
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  3. Yohan87
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    Yohan87 Member

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    [Oct 30, 2012]
    Welcome to the forum.

    Would you not be better replacing the N75 with a working one?
    #2
  4. camscockle20vT
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    camscockle20vT The stigs ugly brother

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    [Oct 30, 2012]
    Hi and welcome to asn, mbc do not go well with these engines. Everyone and their dog will tell you to replace with a working n75. It will be alot safer, since a heftey boost spike could see you with a bent rod at best.
    #3
  5. clintonellis
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    clintonellis audi A3 1.8t AGU

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    [Oct 30, 2012]
    actually not....people always complain about spikes and cut outs ect dues to the fact that they dont have a remap.....and im running it directly....not inline with the N75. must i post a video of the boost?
    #4
  6. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Oct 30, 2012]
    So how are you adjusting the fueling and timing to suit the added boost?

    Lean city...
    #5
  7. Gops
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    Gops 6th gear @7000rpm

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    [Oct 30, 2012]
    As Byzan says! Leannnn!

    get a new n75 and rid of the MBC
    #6
  8. coatesy
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    coatesy poking badgers with spoons

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    [Oct 30, 2012]

    haha lean city made me laugh, next time i go to the shop and see lean meat, im going to shout lean city! just for you.
    #7
  9. colicabcadam
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    colicabcadam Guest

    [Oct 30, 2012]
    1.2 bar ? i am sure most people run 1.4 peak on a remap ?
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  10. Chlippo
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    Chlippo Member

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    [Oct 31, 2012]
    mbc and N75 have been discussed to death...I run mbc and N75 in parallel
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  11. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Oct 31, 2012]
    agu, remapped already... mbc set to as mapped level of boost.... working maf sensor....

    should'nt be too far off if mapped ok originally?
    #10
  12. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Oct 31, 2012]
    That's the point, who knows, he has just thrown more air/boost at it and hoped for the best.
    #11
  13. clintonellis
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    clintonellis audi A3 1.8t AGU

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    [Oct 31, 2012]
    Firstly I've got a stage 2 map and the mbc will work as long as you don't adjust boost more than what it's been mapped too....by blocking all boost my car runs at 5psi and save me a lot of fuel and for the guy that asked how do I adjust timing and fueling...when your car gets mapped it gets a modified map table which tells the car how much fuel to put with the corresponding boost pressure so by turning it down to 0.5 bar it still runs smoothly and no jerking or anything
    #12
  14. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Oct 31, 2012]
    ..he knows this... but you didn't say your car was mapped hence the question... if you had said your car was mapped and that you were running no more boost than was mapped for then he wouldn't have asked the question..

    Still... all you actually have to do is unplug the N75 electrically (people here use a switch to do the same) and this ha the same affect... actuator pressure is around 5psi on a K03...

    MBC's are not as nice on part throttle than running N75 as the map will adjust boost based on throttle position/revs/requested load etc... N75 control is preferable but the ECU the AGU uses isn't that clever... using an MBC on an ME7 ECU is a little more agro but you loose all the nice part throttle control... generally use MBC's in parallel to control boost spikes as a cheaper alternative to having a custom map or if hardware changes have given a massive spike in boost on spool...

    N75 can be made to control boost very well... mine runs 1.8bar to redline steady as a rock under N75/ECU control

    <tuffty/>
    #13
  15. clintonellis
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    clintonellis audi A3 1.8t AGU

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    [Oct 31, 2012]
    I know I was just saying and thanks for the back up man :) I only use the mbc because I go to drags every Sunday and its really pointless me running high boost in everyday use that's why I use it and here in South Africa the fuel is really really expensive cause our government pockets all the money. I will be replacing the n75 as soon as Audi gets me one cause I do love the control by it
    #14
  16. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Oct 31, 2012]
    <pedant mode on>

    I was going by the 1st post


    <pedant mode off>

    :beerchug:
    #15
  17. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Oct 31, 2012]
    lol... :D

    <tuffty/>
    #16
  18. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Oct 31, 2012]
    I know how mapping works, but sadly i have seen more bad/lean maps than good safe ones. Hence my concern for you. Hey if your happy, go for it.

    If you are sticking to what it's been mapped for I guess no harm is being done, my concern is the temptation to turn it up "just for a spriont or 2"
    It's not my turbine housing and manifold that may or may not crack,lol


    Last edited: Oct 31, 2012
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