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1.8t apu need more power

Andy avant b5 Sep 13, 2017

  1. Andy avant b5

    Andy avant b5 Active Member

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    Hi everyone have a4 b5 avant with the apu engine really want to up the power already have straight though exhaust still have the cat in place had a remap currently running 195 bhp really want more anyone got a suggestion thanks
     
  2. Oranoco

    Oranoco Well-Known Member

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    Nitrous?
     
    DieselJake likes this.
  3. Andy avant b5

    Andy avant b5 Active Member

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    Lol I like your thinking
     
  4. aragorn

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

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    The turbo you have wont do any more, so any additional power either needs a new, larger turbo, or as Kev says, Nitrous.
     
  5. Andy avant b5

    Andy avant b5 Active Member

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    Lol OK is a ko4 turbo just a straight bolt on
     
  6. Oranoco

    Oranoco Well-Known Member

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    One of the K04's (can never remember which) bolts straight on after clocking the housing, set of C20LET injectors and a VR6 MAF housing the original sensor and an upgrade to the intercooler and you're good for about 230bhp.
     
  7. Andy avant b5

    Andy avant b5 Active Member

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    OK sounds easy lol how much for a ko4
     
  8. Oranoco

    Oranoco Well-Known Member

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    I sourced mine second hand for about 250. Injectors were 100, MAF was 45,intercooler 200. (my injectors and May housing will be for sale as have upgraded further and am in the process of changing the management over.
     
  9. Oranoco

    Oranoco Well-Known Member

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    I would post my graph but Photobucket has been screwed for its users
     
  10. Andy avant b5

    Andy avant b5 Active Member

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    OK cheers is it a easy job to do
     
  11. Oranoco

    Oranoco Well-Known Member

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    Depends what you're like with a set of spanners. Took a friend and I an afternoon and evening to do the hardware with my ruined back. Couple of the bolts are awkward (turbo oil return) and will have you swearing.
     
  12. Andy avant b5

    Andy avant b5 Active Member

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    OK don't sound to bad just need to find all the bits I need cheers
     
  13. Andy avant b5

    Andy avant b5 Active Member

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    So I don't need any mapping it's just bolt on parts
     
  14. Oranoco

    Oranoco Well-Known Member

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    It will operate without but to get the results from it a chip will need to be written. Alternatively you can swap to a Golf AGU ecu which can then be dashed via the OBD port.
     
  15. Andy avant b5

    Andy avant b5 Active Member

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    OK sounds good so I can expect 250bhp will I need to upgrade the clutch
     
  16. Oranoco

    Oranoco Well-Known Member

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    Scratch ECU comment as it's the later DBW ECU so can be flashed anyway.

    I was making 245bhp with the standard 180,000 Mike clutch. I did suffers failure of the flywheel but think that was more mileage and abuse related
     
  17. Andy avant b5

    Andy avant b5 Active Member

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    Lol abuse related love it
     
  18. Andy avant b5

    Andy avant b5 Active Member

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    What c20let injections do I need there are loads of different ones
     
  19. Andy avant b5

    Andy avant b5 Active Member

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    Also someone suggested bex turbo from a b6 will that fit
     
  20. aragorn

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

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    The BEX turbo is thesame as the "k03s" and will bolt right on. Only good for 230ish though realistically.

    For 250 you'll need a hybrid.

    No factory k04 fits, well bar the -015 special that Borg Warner made, however that's basically just a k03s.
     
  21. Andy avant b5

    Andy avant b5 Active Member

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    Ok so will any ko3s fit
     
  22. aragorn

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

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    No. Only specifically the BEX turbo.
     
  23. aragorn

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

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    No. Only specifically the BEX turbo.
     
  24. Andy avant b5

    Andy avant b5 Active Member

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    Ok cool many thanks
     
  25. Oranoco

    Oranoco Well-Known Member

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    The BEX manifold is different internally as well so should (in theory) flow a little better.
     
  26. Andy avant b5

    Andy avant b5 Active Member

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    OK cool is it just a swap over bolt straight on?
     
  27. Andy avant b5

    Andy avant b5 Active Member

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    The throttle body looks different on mine compared to the bex one
     
  28. Andy avant b5

    Andy avant b5 Active Member

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    So if I put the bex turbo on and different injectors will that get me more power
     
  29. Oranoco

    Oranoco Well-Known Member

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    On their own no. It's a combination of all the parts working together with the software that will net you the increase
     
  30. Andy avant b5

    Andy avant b5 Active Member

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    OK cool need to sort my alloys out first really don't like the rs4 I think they make the car older than it is
     
  31. aragorn

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

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    If you fit the turbo you will get a small boost, but it'll more or less make stock power. You'll need a custom remap to get the most from it.

    The injectors can only be fitted with a remap to suit. I think the APU injectors are a little larger anyway, you might get away without changing them on an APU, but you'd need to check the flow rate.
     
  32. Andy avant b5

    Andy avant b5 Active Member

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    OK cheers so the apu runs bigger injectors
     
  33. aragorn

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

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    Looks like they are different injectors, but the same flow rate.
     
  34. Andy avant b5

    Andy avant b5 Active Member

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    Ok thanks bud
     
  35. Oranoco

    Oranoco Well-Known Member

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    If you run the stock MAF in a VR6 housing that will scale close enough. Ran mine like this with a Superchip and with a wideband probe up its bum and det cans it was pretty good.

    Slippery slope though, if I'd known then what I do now I would have just got an S4 lol
     
  36. Andy avant b5

    Andy avant b5 Active Member

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    Ok that sounds like a plan cheers
     
  37. aragorn

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

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    APU is different (ME7.1) and not as easy to fool like that. Unlike the AEB the ME7.1 management has boost sensing and nailing a scaled MAF in will just cause the ECU to get unhappy.
     
  38. Andy avant b5

    Andy avant b5 Active Member

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    Ok now I am confused lol
     
  39. aragorn

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

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    With the older ECU's they could be fooled by using a larger MAF. Its a bit of a bodge but worked ok.

    With your car, its ECU is cleverer and cant be fooled the same way.

    You need a remap to match whatever changes you make.
     
  40. Andy avant b5

    Andy avant b5 Active Member

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    Ok it's already had a remap but once I put the new turbo on will it need another one?
     

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