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7A fuel regulator question.

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  • 7A fuel regulator question.

    Just wondering if you can use the 4 bar fpr out of v6 c4/b4 on the 7A engine. I know they are a drop in type. I have used a spare rail and rigged myself a solution. My main concern is the 7A needs 4.2 bar at WOT. I have tried the 4 bar fpr but the car feels a little flat up top. Other wise would a 4.5 bar fpr be the way to go?

  • #2
    I’ve heard it said that if you have a way to measure the pressure, you can raise the pressure from 4 Bar to 4.2 by squeezing the FPR in the vice with a ball bearing on top. I’ve not tried this myself though!

    S2 Coupe 3B Project


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    • #3
      The 7A FPR (a 054 133 534) is supposed to be an odd-man out 4.5 Bar unit, so you shouldn't use a 4.0 Bar. I understand that some 1.8T engines used a 5.0Bar FPR.

      Some Fuel Pressure Regulator info:

      http://forums.quattroworld.com/s4s6/msgs/21108.phtml



      RS2'd 93 UrS4 5 spd sedan
      94 UrS4 V8 6 spd manual avant

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      • #4
        I'll get a 4.5 bar drop in fpr as with the 4 bar one it is not running properly. I'll give the ol ballbearing trick a go before I change it to see if it does make a difference.

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        • #5
          Originally posted by UrS4boy View Post
          The 7A FPR (a 054 133 534) is supposed to be an odd-man out 4.5 Bar unit, so you shouldn't use a 4.0 Bar. I understand that some 1.8T engines used a 5.0Bar FPR.

          Some Fuel Pressure Regulator info:

          http://forums.quattroworld.com/s4s6/msgs/21108.phtml


          On the main crank breather hose (the elephant trunk) there is a tee leading somewhere else. Where?. Mine does not have this tee.

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