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N75 & FPR

Discussion in 'A3/S3 Forum (8L Chassis)' started by Drill, Oct 21, 2004.

  1. Drill
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    Drill Member

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    [Oct 21, 2004]
    OK, I've been searching around a bit lately for info on the N75J and 4 bar fuel pressure regulator. What I've found has brought more questions to mind (and maybe even an idea /ubbthreads/images/graemlins/crazy.gif)

    Anyway, I've read that while the N75J (and H) changes the characteristics of the std wastegate (Mainly by holding/building more boost) it's been mentioned that this additional boost is not accounted for by the ECU and therefore, no additional fuel is supplied.

    I've also read that running a 4 bar FPR in leu of the std 3 bar part can lead to an engine running rich.

    SO, here's my question/idea. While running a std K03 ("Sport") on a remapped car, would the 4-bar FPR help to offset the potential problems of the N75J valve?? /ubbthreads/images/graemlins/confused.gif

    Just trying to make some sense. I can really feel the extra pull that the N75J gives (While I have some hesitation issues to solve /ubbthreads/images/graemlins/smirk.gif) but as I put about 600 miles on my car each week, I don't want to run anything that could make my engine "go BOOM!" /ubbthreads/images/graemlins/angel.gif

    Thanks /ubbthreads/images/graemlins/beerchug.gif
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  3. ANDYTQ
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    ANDYTQ Well-Known Member

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    [Oct 21, 2004]
    Drill i did vagcom runs with a J and with a standard F,standard was much stronger and smoother,J just spikes high readings ,but is not so drivable. /ubbthreads/images/graemlins/beerchug.gifAndy
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  4. t30gue
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    t30gue Member

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    [Oct 21, 2004]
    Just put a J on my S3 in place of the N75c, wasn't too convinced at first. Took it out for a longer run, car seems smoother if anything, but with a bit more top end boost. Still not hit limp mode yet /ubbthreads/images/graemlins/tongue.gif
    Andy,
    If I hang on to the old N75, Do you fancy testing the two valves using Vagcom? Maybe AMD will do this Sat?
    See you on route,
    Chris.
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  5. dickys3
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    dickys3 Moderator Staff Member Moderator

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    [Oct 21, 2004]
    Was it easy to fit Chris?
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  6. ANDYTQ
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    ANDYTQ Well-Known Member

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    [Oct 21, 2004]
    If i can keep up Chris /ubbthreads/images/graemlins/smile_smoking.gif,Rich it takes 5 mins to swap,but original clips can be a t***t to remove and they can't be reused.I will bring the plots for valves with me on saturday and a spare j valve.Not long now boys and mines absolutely flying at the moment.Cheers Andy
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  7. NWMark
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    NWMark Member

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    [Oct 21, 2004]
    Andy ,

    do you know the part number of the J valve, trying to get a price for one from my dealer but wanted the part no first.

    thanks

    Mark
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  8. T3RBO
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    T3RBO 6th Gear

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    [Oct 21, 2004]
    N75J - 034906283J

    Still considering this myself but worried about going limp once chipped...
    #7
  9. dickys3
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    dickys3 Moderator Staff Member Moderator

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    [Oct 22, 2004]
    [ QUOTE ]
    T3RBO said:
    N75J - 034906283J

    Still considering this myself but worried about going limp once chipped...

    [/ QUOTE ]

    /ubbthreads/images/graemlins/blush.gif

    Me too. Does anyone have the AmD remap and the N75J?

    Does it go limp? /ubbthreads/images/graemlins/blush.gif

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  10. NWMark
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    NWMark Member

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    [Oct 22, 2004]
    If it does go into limp mode ill just remove it again, but i plan on doing a few runs and logging the boost via VAGCOM to see how the original and J valve compare.

    I really just want it to hold more boost, but if it gives me a big initial boost spike, which is what ive read itll be coming straight back off.

    Thanks

    Mark
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  11. nervus
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    nervus Well-Known Member

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    [Oct 22, 2004]
    Does snyone have a picture of these valves and where abouts they are located in the engine bay? i take it these are different to the DV?
    #10
  12. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    [Oct 22, 2004]
    [ QUOTE ]
    nervus said:
    Does snyone have a picture of these valves and where abouts they are located in the engine bay? i take it these are different to the DV?

    [/ QUOTE ]

    Right,

    By the DV, there is a golf coloured thing with a plug on it and 3 pipes... 2 small ones, and then it goes into the intake hose...This is the N75

    The FPR, is at the end of the fuel rail by the injectors and have a vacuum line on it

    Rich
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  13. nervus
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    nervus Well-Known Member

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    [Oct 22, 2004]
    /ubbthreads/images/graemlins/beerchug.gif
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  14. greytsport1
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    greytsport1 Member

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