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Thread: FPR question

  1. #1
    audi-a6's Avatar
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    FPR question

    Looking at upgrading the fuel system on my a6 2.7t, done all the lines, new pump and rs4 injectors on the way, i found a new Fuel Pressure regulator (5 BAR). question is, will it make any difference? will it give me more fuel flow to the engine as a pose to my current 4 bar regulator?
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  3. #2
    "Stick a V8 in it!"

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    its a two edged sword.

    First of all, yes, higher rail pressure will allow the injectors to flow more fuel, BUT, the pressure is offset by boost. That means if you have a 4 bar regulator, and have 1.5 bar of boost, the rail pressure increases to 5.5bar. The problem is that the higher the pressure, the less fuel the pump can flow, and obviously your putting everything else under more stress too.

    5 bar static pressure is quite simply far too high. All you'll end up doing is breaking the fuel pump.

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    but if i have a pump to cope and a map to suit?
    Passat B5.5 tdi....... big plans to come
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    "Stick a V8 in it!"

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    buy larger injectors instead.

    There is NO reason to be running a 5 bar regulator.

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  6. #5
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    Quote Originally Posted by aragorn View Post
    buy larger injectors instead.

    There is NO reason to be running a 5 bar regulator.
    cool, already got rs4 injectors now lol
    Passat B5.5 tdi....... big plans to come
    Audi A3 8p motor way work horse
    Nissan Skyline r33 gts-t ..... my mid life crisis fun car

  7. #6
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    sad time, guy that was selling fuel pump has turned out to be an idiot! so i still need a fuel pump, any ideas as to which one..... ill be running 630cc injectors
    Passat B5.5 tdi....... big plans to come
    Audi A3 8p motor way work horse
    Nissan Skyline r33 gts-t ..... my mid life crisis fun car

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    jcb
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    Bosch motorsport 044

  9. #8
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    Quote Originally Posted by jcb View Post
    Bosch motorsport 044
    yeah i looked at them, but arnt they external?
    Passat B5.5 tdi....... big plans to come
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  10. #9
    jcb
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    no.
    Run them in a V8 cage and filter
    minor modding required




 

 

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