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    Thread: RS4 Fuel return valve

    1. Member CoNGLoMeRaTeGTi's Avatar
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      03-23-2010 06:27 PM #26
      Quote, originally posted by Runin2Rich4FSi »
      this is interesting.... my car has had a slight issue with fueling as I go through the gears.. I wonder if this would help. Changing the valve on the pump, changing fuel filter, and swapping lpfps have done nothing. First I need to run more logs.

      i had the same issues.
      arin schooled me to the possible rail valve issue.
      i remember him telling me that the A4s were having the same issues. since he mentioned A4s i completely ignored it. but i then found a very old thread where he posted up something about it and i decided to take the dive. car has been running like a savage since. i am now able to break third loose.
      this valve is really for individuals that are running software that require 127+ bar. otherwise the regular valve works for software that requests 122-125(uni).

    2. Member Runin2Rich4FSi's Avatar
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      03-23-2010 06:43 PM #27
      thanks, my stage 3 sometimes has the power in the 3rd to let loose, but more times than not... I am a little flat on power. I will order this tomorrow and give it a shot. I will report back in a few weeks or less.

    3. 03-23-2010 06:43 PM #28
      can someone toss out the PN for the rs4 fuel rail pressure valve?
      would be interested in seeing some results here...
      2007 GLI - Built 2.0TFSI DSG w/ 3071R, LSD, BBK, Ultralows - gathering dust
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    4. Member Runin2Rich4FSi's Avatar
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      03-23-2010 06:44 PM #29
      Quote, originally posted by CoNGLoMeRaTeGTi »
      PN is 079130757


    5. Member rracerguy717's Avatar
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      03-23-2010 06:44 PM #30
      Quote, originally posted by yvrnycracer »
      can someone toss out the PN for the rs4 fuel rail pressure valve?
      would be interested in seeing some results here...

      Quote, originally posted by CoNGLoMeRaTeGTi »
      PN is 079130757
      Read below about mine and other fsi stage 3 owners bad experience and poor results with APR and there Stage 3 Kits. http://forums.vwvortex.com/showthrea...ge-3-dyno-runs
      Quote Originally Posted by jhines_06gli View Post
      I'd say you have nothing to worry about, but then again.....you are driving a modified VW. You have EVERYTHING to worry about!!!
      -J. Hines

    6. Member Runin2Rich4FSi's Avatar
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      03-23-2010 06:47 PM #31
      Quote, originally posted by yvrnycracer »
      can someone toss out the PN for the rs4 fuel rail pressure valve?
      would be interested in seeing some results here...

      sent pm.

    7. 03-23-2010 06:47 PM #32
      i think i am totally a dumb ass
      but am i talking about one in the same here?
      2007 GLI - Built 2.0TFSI DSG w/ 3071R, LSD, BBK, Ultralows - gathering dust
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    8. Member rracerguy717's Avatar
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      03-23-2010 06:53 PM #33
      Quote, originally posted by Runin2Rich4FSi »
      this is interesting.... my car has had a slight issue with fueling as I go through the gears.. I wonder if this would help. Changing the valve on the pump, changing fuel filter, and swapping lpfps have done nothing. First I need to run more logs.

      Rich Funny thing is im on a stock intank pump and i have no issues maybe your APR upgraded intake pump is spiking above and popping your stock valve open hence the fuel pressure drop ? Bob.G
      Read below about mine and other fsi stage 3 owners bad experience and poor results with APR and there Stage 3 Kits. http://forums.vwvortex.com/showthrea...ge-3-dyno-runs
      Quote Originally Posted by jhines_06gli View Post
      I'd say you have nothing to worry about, but then again.....you are driving a modified VW. You have EVERYTHING to worry about!!!
      -J. Hines

    9. Member Runin2Rich4FSi's Avatar
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      03-23-2010 07:01 PM #34
      I swapped out my APR pump and went back to the stock one.

    10. Member CoNGLoMeRaTeGTi's Avatar
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      03-23-2010 07:03 PM #35
      Quote, originally posted by yvrnycracer »
      i think i am totally a dumb ass
      but am i talking about one in the same here?

      http://www.worldimpex.com/part....html
      doesn't get easier than this

    11. Member CoNGLoMeRaTeGTi's Avatar
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      03-23-2010 07:05 PM #36
      Quote, originally posted by Runin2Rich4FSi »
      I swapped out my APR pump and went back to the stock one.

      Willing to part with that APR LPFP?
      If so, PM me.

    12. Member rracerguy717's Avatar
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      03-23-2010 07:09 PM #37
      Quote, originally posted by Runin2Rich4FSi »
      I swapped out my APR pump and went back to the stock one.

      mmmm well I may swap this RS4 valve in when I check my cam follower and intake valves next time i have the manifold off just for future LPFP option it can't hurt IMO Bob.G
      Read below about mine and other fsi stage 3 owners bad experience and poor results with APR and there Stage 3 Kits. http://forums.vwvortex.com/showthrea...ge-3-dyno-runs
      Quote Originally Posted by jhines_06gli View Post
      I'd say you have nothing to worry about, but then again.....you are driving a modified VW. You have EVERYTHING to worry about!!!
      -J. Hines

    13. Member staulkor's Avatar
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      03-23-2010 07:51 PM #38
      genuinevwaudiparts.com has the valve for $70.20 + shipping.

    14. Member Runin2Rich4FSi's Avatar
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      03-23-2010 10:18 PM #39
      sweet! tx staulkor

    15. Member LEWXCORE's Avatar
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      03-23-2010 10:30 PM #40
      does anyone know what bar uni big turbo file runs?

    16. Member CoNGLoMeRaTeGTi's Avatar
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      03-23-2010 10:50 PM #41
      Now that's a bargain. Make sure it's not the A version.

    17. Member CoNGLoMeRaTeGTi's Avatar
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      03-23-2010 10:51 PM #42
      Low 120s

    18. Member Runin2Rich4FSi's Avatar
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      03-24-2010 09:23 AM #43
      just ordered my new valve.

    19. 03-24-2010 02:08 PM #44
      got one coming too. We'll see what happens. Not expecting big things but not expecting anything bad to come of it either. Worst case, i'll have another round of intake valve pics to post

    20. Member loudgli's Avatar
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      03-25-2010 09:57 PM #45
      Does anyone see any reason to run this valve with software that only request 122 bar? My Giac request that and in 4th gear at 7200rpm it sometimes dips to 119.xx. Ive seen my low side pressure down to about 3.7 bar. Seems different people have different opinions about minimum low side fp.

    21. Member brekdown29's Avatar
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      03-25-2010 11:52 PM #46
      sub'd

    22. Member LEWXCORE's Avatar
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      03-26-2010 12:03 AM #47
      Quote, originally posted by loudgli »
      Does anyone see any reason to run this valve with software that only request 122 bar? My Giac request that and in 4th gear at 7200rpm it sometimes dips to 119.xx. Ive seen my low side pressure down to about 3.7 bar. Seems different people have different opinions about minimum low side fp.

      This
      but more along the lines of a unitronic big turbo car on RS4 injectors that could use more fuel to run high boost at a nice AFR. If i upgraded the in-tank pump and added the RS4 valve i wonder how much more it would flow to the rs4 injectors.

    23. Member CoNGLoMeRaTeGTi's Avatar
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      03-26-2010 07:24 AM #48
      Call me crazy for even thinking of a theory:
      Arin informed me of this issue many many moons ago when I first got my APR HPFP. I thought there was something wrong with my HPFP. Anywho, it just so happens that the highest HP FSI was an APR tuned car. Riddle me this batman, could this be one of the so called "secret parts" that USP was using to yeild such high HP?
      If so, prepare to see many many many more high HP dyno figures as this mod becomes
      more popular.
      I bet uni will custom tune to 135 bar shortly.
      500whp on pump gas FSIs will soon be the norm.


      Modified by CoNGLoMeRaTeGTi at 7:25 AM 3-26-2010

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      03-26-2010 07:40 AM #49
      I don´t understand, why everybody is so surprised now...the topic was already discussed some months ago and just a few were intereseted
      I hope for new injector testings due to flow rate and spray pattern of the rs4´s. Everybody remembers the picture from AWE tuning and first view lower flow rates of RS4 injectors compared to S3 ones.
      Maybe also the black smoke problem can be solved or improved with our sperical dish design pistons and RS4 injectors under higher pressure!
      ...for my project, the FP Valve lays at home since november..

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      03-26-2010 08:45 AM #50
      Quote, originally posted by Hendrik »
      I don´t understand, why everybody is so surprised now...the topic was already discussed some months ago and just a few were intereseted
      I hope for new injector testings due to flow rate and spray pattern of the rs4´s. Everybody remembers the picture from AWE tuning and first view lower flow rates of RS4 injectors compared to S3 ones.
      Maybe also the black smoke problem can be solved or improved with our sperical dish design pistons and RS4 injectors under higher pressure!
      ...for my project, the FP Valve lays at home since november..

      The flow tests are not done at full pressure, they are done at only about 100psi if i recall correctly from speaking with the company who makes the machine.

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