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RS4 Fuel Valve?

mjr901 Jun 2, 2012

  1. mjr901

    mjr901 Guest

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    just wondering whether it's something worth doing for stage 2+? does it make a big difference? I've got everything I need for this stage but I've known people to run these uprated fuel valves aswell.

    Do people run others like R8 ones etc? or do I just stick to the original or indeed use the RS4 valve?
     
  2. Boydie

    Boydie S3 8V DSG VCDS Map User

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    100% do it. Valve is £40 from Audi and takes an hour to fit.

    Recommended to me by Revo
     
  3. mjr901

    mjr901 Guest

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    is it just the RS4 one thats used? :)
     
  4. loudchris53

    loudchris53 Member

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    Does this make the car use more fuel?

    Chris
     
  5. mjr901

    mjr901 Guest

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    I cant see it using less tbh so if it aids power i should think, yep, more fuel. but is it worth it.... guess ill just do it anyway!
     
    grainqey likes this.
  6. loudchris53

    loudchris53 Member

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    lol, i suppose! bet it makes a big performance difference though :)

    Chris
     
  7. S.

    S. Save the manuals Team Ibis TFSI Owners Group Audi S3 quattro Manual

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    it holds fuel pressure up, a worth upgrade for that money.
    i'm doing mine as soon as i get time..
     
  8. JamesS4cab

    JamesS4cab Well-Known Member

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    Definately do it. Doesn't make a massive difference but gets rid of the known power dip at 5k rpm.
     
  9. Silky-S3

    Silky-S3 Is loving his new 8V S3!

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    Has anyone got a guide to fit this? Looks like a right ***** of a job?
     
  10. mjr901

    mjr901 Guest

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    Just done some more research on this and 99% of people say its an **** of a job. best to let the garage do it for an hours labour.

    backdraft have done quite a few apparently.
     
  11. mjr901

    mjr901 Guest

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    the part itself looks well easy just to screw in.

    i think it's access where people struggle.

    people have to bend spanners etc to do it, some even take off the manifold!
     
  12. nil538

    nil538 Active Member

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    Has anyone got a pic of a rs4 valve next to a standard s3 one ?
     
  13. JamesS4cab

    JamesS4cab Well-Known Member

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    You won't be able to see the difference from memory. It's just the size of the nozzle on the inside. Bank on an hours labour to fit for someone that knows what they are doing.
     
  14. s3ollie

    s3ollie Member

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    they look identical its the cracking pressure thats different i think its something like 130 bar for standard and 136 bar for the RS4 one.

    [​IMG]
    I bent some spanners to save taking the manifold off
     
  15. mjr901

    mjr901 Guest

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    would a long socket get to it if you put the 90 degree angle piece you get in these halfords advanced sets?
     
  16. Kelza

    Kelza MODERATOR Staff Member Moderator Audi RS3

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    Hi guys a bent spanner is the best way in ,ohh err misses..this is how statllers done mine..:)
     
    grainqey likes this.
  17. Kelza

    Kelza MODERATOR Staff Member Moderator Audi RS3

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    Next will be....- HPFPupgrade Stage 2 kit (155bar hpfp + 155bar return valve). 10 times better than APR HPFP
     
  18. mjr901

    mjr901 Guest

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    tell me more......:) linky?
     
  19. Silky-S3

    Silky-S3 Is loving his new 8V S3!

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    You wanna lend them out mate? :)
     
  20. Kelza

    Kelza MODERATOR Staff Member Moderator Audi RS3

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    Hi silky you not near statllers ask craig for a spare one..lol
    VAGOC.co.uk | VAGOC.co.uk link to stage 2 Hpfp
    S3 dan was using a revision autotech stage 2 Hpfp...:)
     
  21. downtothebone

    downtothebone Active Member Team Scuba Audi A3 Audi Cabriolet Owner Group S-line owners group

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    Is this more for an uprated S3 or will a remapped 2.0 TFSI benefit?
     
  22. S3Alex

    S3Alex Rarely neutral Team Ibis TFSI Owners Group Gold Supporter Audi S3 DSG

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    Quite likely that until you get to 360ish bhp that it will make little difference but the best way is to log fuel rail pressures and see if there are any significant dips which would make the RS4 regulator worthwhile.
     
  23. Ben2487

    Ben2487 Active Member

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    I called APR to see if I require a rs4 valve for stage 2+ and they said it's not a requirement so I asked would there be any advantage of fitting one and he couldn't really give me answer so I can't understand if it not a requirement the map must run on standard fuel pressure my only concern would there be any points along the map where it would run lean as it couldn't cope with the fuel required. Is it worth doing to be on the safe side? And if I need to take the manifold off to reach it I may vary well do the rfd while I'm there before it goes into mapped


    Sent from my iPhone using Tapatalk
     
  24. MICHAEL PARKER

    MICHAEL PARKER S3 Sportback

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    Aks fitted mine for me .
     
  25. prt57

    prt57 Well-Known Member

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    I am running APR stage 2+ and I asked the same question. This is the reply from Al Brown of Awesome.


    It isn’t required as such, and won’t give any additional power, however one of the reasons we recommend it is because it allows a bit more headroom on the low pressure side of the fuelling system, which means there’s extra there if it needs it. Almost as a safeguard.

    So I had Awesome fit it to my car and they quoted one hours labour. Fit and forget in my view.
    R-Tech recommend it but their maps seem to produce higher torque figures than APR.

    It is not a job for the novice mechanic. I have done spannering for many years now but was worried about getting everything tight enough, especially with the fuel under high pressure. Special crows foot spanners needed if you do it with the manifold still in place.
     
    Ben2487 and nluk100 like this.
  26. Ben2487

    Ben2487 Active Member

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    Exactly what I wanted to know thank you


    Sent from my iPhone using Tapatalk
     

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