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Modified URS6 running rich

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  • Originally posted by twoqu View Post
    The reasoning behind albeit temporarily getting the fuel pressure down is to get the car back to as stock condition as possible for the MOT test. Ideally we would want the stock fuel pressure, stock injectors, stock sw and a maf that based on its history is still within spec. That gives us the maximum chance of success.
    It is a good opportunity to get a base comparsion via VCDS between the two mafs which I have suggested previously. If the OP tested the ecu to see what resistor it has then we would know which range was applicable. Not that it makes a lot of dfference as the factory specs are 15-24 for ADU and 20-26 for AAN then anything above the top limits suggests the maf.
    I understand the lambda is a new replacement.
    This is all correct Sir

    I appreciate everyones help and input thus far as I certainly couldn't have got to this point without you guys and gals

    Getting a standard ECU and injectors is a backwards but I concur logical step.......just waiting for a reasonably priced set to turn up as it will only be used for a short period of time to prove our theory

    Tonight I will measure the resistor resisitanr to ascertain if a have an RS2 modified ECU and find a way of accessing block 000

    I can use my aeromotive regulator to get stock fuel pressure


    • Again, the test is done at fast idle (~ 2000 rpm) where the fuel pressure is most likely normal, who cares about pressure at idle?
      I mean go on, do more useless things

      Factory specs for MAF are way too conservative, because they have to account for AC on and so on. ADU over 22 and AAN over 25 = screwed. -


      • Mild update

        Fitted a standard "AA" ECU and standard injectors which I purchased from another member on this great forum. Had no joy getting VagCom working yet to check the 000 blocks

        The CO has dropped incredibly from 7.2% to 0.6%.......this is still not a pass but extremely close. The MOT chap states that the issue now is the small "race cat" which is fitted

        This only leaves a bad map or poorly deka injectors to blame

        NB: I am very aware I must not use boost in its current setup, making sure I don't go above 1bar (absolute)


        • Well done. Sounds like you are getting there


          • Good to hear they have done the trick


            • Yeah need to see 000 blocks, but if it's in closed loop and regulating then it should indeed be the cat.
              Get a proper big size 200 cell cat, a 5" one or so.


              • Originally posted by prj View Post
                Yeah need to see 000 blocks, but if it's in closed loop and regulating then it should indeed be the cat.
                Get a proper big size 200 cell cat, a 5" one or so.
                Now the decision of which ECU route to go down

                I've lost faith in "experts" tuning the standard motronic


                • Either standard motronic with prjmod, or .... well... it's even trickier with "experts" tuning standalones
                  Pick who is going to map your car and then buy the ECU they are most comfortable with.

                  For me it's Ecumaster PnP, but I am not going to tune your car


                  • Little update for you peeps

                    A new 3" magnaflow cat has been fitted along with a wideband bung just incase it's required further down the line, aswell as a sytec adjustable FPR which is set to 4bar without vacuum

                    Emissions passed!!! Not just scraped through either the CO is now 0.029%

                    Just a couple of rear brake pipes to change now and she's roadworthy and working

                    Thank you for all of your input so far, I literally couldn't have done it without you
                    Last edited by S4Marc; 9th August 2018, 19:07.


                    • Comment

                      • Nice one

                        S2 Coupe 3B Project

                        Ur quattro restoration

                        S2 Avant

                        Boost is the new rock and roll!


                        • Excellent result.
                          96 URS6 plus speck saloon
                          96 URS6 plus speck estate
                          94 2.6 80 Avant
                          99 2.8 final edition Cabriolet