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Stage2 pressure regulator needed?

gez Aug 6, 2010

  1. gez

    gez S3 hunter

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    Hi, is a 4 bar fuel pressure regulator needed on stage 2 setup on the S3???
     
  2. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Nope...

    <tuffty/>
     
  3. S3KO4

    S3KO4 Member

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    revo 2 needs one. it make sense to run more fuel to gain more power!
     
  4. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Revo used to specify having a 4 bar FPR but don't anymore... its not required for a std K04...

    Revo stage 2 (or any stage 2 for that matter) doesn't give much more than a stage 1... will feel a bit better though as it will make better use of the stage 2 prerequisits but a 4 bar is really not needed and will tax the standard (old) fuel pumps into early retirement making the engine run lean...

    <tuffty/>
     
  5. gez

    gez S3 hunter

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    Ok i didnt think i needed it. Going to amd next sat for stage 2map and was reading on other threads that its needed. You would surly only need it with an upgraded pump and hybrid or the like.
     
  6. S3KO4

    S3KO4 Member

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    I agree with you tuffy, I've also heard the pump story before from badger5, but when I wanted to get the stage 2 done, AMD essex told me I would not see any increase in BHP or torque unless I had one of those, so I had to go with the flow.
     
  7. 1animal1

    1animal1 The Clar!! it mouves!!! VCDS Map User

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    hmmmm AMD Essex :)
     
  8. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    answer is dependant on the code provider.

    is it required? technically no

    some write code which is aimed at 4bar being used however... but in tuning terms its not required no, and i fear for the pumps ability to provide sufficient flow when squeazed down to 4bar pressure is risking lean conditions as its flow sags under the pressure, more so on older cars like s3's are

    check with your chosen mapper.. is my advise

    i dont use them
     
  9. S3 Paul

    S3 Paul Well-Known Member Regional Rep

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    A 4 bar reg will kill a old pump. in my case a 9 year old one...
    Ive got a new one in there now but if the car is mapped again or i take things any further i will change the injectors rather than continue to run 4 bar reg
     
  10. s3_kev

    s3_kev Stage2'd!!!!!!

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    im running 4 bar reg on an AMD map, i was massivly dissapointed with the way the car was mapped by them so much so i hate the map, but in reality the map is very good once its settled and not running silly wow factor boost!!!!!!!!!! for me my stage2 is a huge improvment over stage1 however i have carried out all neccasary mods to get the most from my stage2

    i do get about -10 to -15% on my long term fuel trims ever since the mapp i no i have absolotly no boost or vac leaks could this be a sign the pump is struggling???
     
  11. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    negative values are the ECU taking fuel out as its getting too much...

    <tuffty/>
     
  12. s3_kev

    s3_kev Stage2'd!!!!!!

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    oh ok cool cheers, so just poor mapping then??
     
  13. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Could well be... does doing a fuel trim reset make the car feel faster of slower?

    I had this on mine while Bill and I were dynoing it the other weekend...

    <tuffty/>
     
  14. S3 Paul

    S3 Paul Well-Known Member Regional Rep

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    Fuel trim reset??
    All getting a bit technical now
     
  15. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    yeah, resets ECU adaptions to 0% again forcing the ECU to 're-adapt'... Bill did this to mine on the dyno the other week with interesting results...

    [​IMG]

    The red graph lines are before the reset and the orange lines are after the reset.... I gained more torque and got smoother delivery... this suggests my map needs fuelling adjustments but then we knew that anyway as its not a final one as yet...

    <tuffty/>
     
  16. s3_kev

    s3_kev Stage2'd!!!!!!

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    i reset it via vagcom by clearing fault codes (there arn't any but still seems to reset which puts all values to 0%???) it used to make a difference with better performance and higher boost but now since recently fixing my long issue i have had with boost pressure it seems to stay at the same boost settings and no difference in performance etc with vagcom reset.. can you reset the ecu properly with vagcom?
     
    Last edited: Aug 7, 2010
  17. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Not sure if there is a specific way to do it but doing a fault code reset on the engine block will typically reset the adaption values...

    <tuffty/>
     
  18. Welly

    Welly VX220 SC Driver :)

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    Interestingly, I'm getting similar issues, for an unknown reason. My long term trims climb towards -10 for no apparent reason. Also, resetting trims makes no obvious difference in power or drive ability....

    Weird....
     
  19. s3_kev

    s3_kev Stage2'd!!!!!!

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    your using revo software arn't you?? so maybe its not software related? prehaps if you find a fault you could point me in the right direction
     
  20. Welly

    Welly VX220 SC Driver :)

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    Will do - I've not looked into it at any length yet as the adaptions aren't getting high enough to make me want to remove my **** from the sofa. I should do though.

    Question - have you de-meshed your MAF?
     
  21. s3_kev

    s3_kev Stage2'd!!!!!!

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    did have but it seemed to have negative effects, was good to start with but the maf started to fail
     

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