7a ecu only 98 fuel?

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  • ACQ
    S2Forum Enthusiast
    • Jun 2008
    • 141
    • Country: Lithuania

    #1

    7a ecu only 98 fuel?

    I was breaking audi 90q with 7a engine for spares, which had really more power than other 7a engines I have drived.

    It has such ecu (see photo) Is it original stick or not? because never see it on 7a ecu before. May it has a chip or something...

    Last edited by ACQ; 3 May 2015, 19:50.
  • UrS4boy
    S2Forum Obsessed
    • Feb 2006
    • 11859
    • Country: Canada

    #2
    I would say that there is a possibilty that that 7A ECU is modified because of a) the 98 RON sticker and b) the hand written red pen note on the box, indicating, to me, that the ECU was sent away to some one who was modding various ECUs and needed to make sure that one went back to its 7A owner.

    BTW dropbox sucks for bringing photos to this forum.

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

    Comment

    • _ShurikeN
      S2Forum Maniac
      • Mar 2010
      • 733
      • Country: Russian Federation

      #3
      There is a guy in my city with 7A swapped in Coupe t85. He has 2 ECUs: stock and chipped. The car acts different with them.

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      • ACQ
        S2Forum Enthusiast
        • Jun 2008
        • 141
        • Country: Lithuania

        #4
        removed a holder and found https://www.dropbox.com/sc/2eic0aj2g...W-W06uBLI2Jxoa
        Last edited by ACQ; 1 May 2015, 19:39.

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        • Bowie69
          S2Forum Fiend
          • Nov 2013
          • 2680
          • Country: England

          #5
          Oh nice!

          but yes, 97+ RON is still recommended for the 7A anyways. Suspect there is more timing in the ABT setup requiring the higher RON.

          Comment

          • Nj
            S2Forum Possessed
            • Jan 2007
            • 3420
            • Home: Scotland Current: Finland

            #6
            Really? Is it worth chipping a standard 7A then, even though it's naturally aspirated?
            --------------------------------------------------------------------
            1990 CQ20v
            2001 3.0 B6 A4 Avant Quattro Sport

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            • mcandmar
              S2Forum Zealot
              • Apr 2004
              • 5118
              • Country: Ireland

              #7
              Not really. I picked up a chip for mine many years ago and the only real difference was a little more torque between 2-4000rpms, it basically ironed out that flat spot ~3k.
              91CQ20v - Gone to a new home
              93UR-S4 - The Magic Carpet
              94S2Bus - The Emerald Express

              Comment

              • Bowie69
                S2Forum Fiend
                • Nov 2013
                • 2680
                • Country: England

                #8
                Yup, exactly, the timing increase was likely in the low range, and reports only gave a moderate torque increase as opposed to all out power. Around 7BHP IIRC was the quoted figure, btu better drivabilty. You wouldn't notice it after a month I would say.

                You are better off working on the intake side of things, throttle body, airbox, MAF etc, which are all restrictive/flow poorly. That and if you have the later cast exhaust manifold, swap it for the earlier bunch of bananas, this was 7-10BHP also IIRC, but more at top end.

                Comment

                • Nj
                  S2Forum Possessed
                  • Jan 2007
                  • 3420
                  • Home: Scotland Current: Finland

                  #9
                  thanks gents. kind of confirms what I thought about chipping/remapping anything without a turbo. When I finally get my car home no doubt I'll spend a lot of time wishing it was my S2 and then wondering whether I should just enjoy it or do something silly like keep an eye out for an 034 kit
                  --------------------------------------------------------------------
                  1990 CQ20v
                  2001 3.0 B6 A4 Avant Quattro Sport

                  Comment

                  • varia
                    S2Forum Maniac
                    • Mar 2009
                    • 821
                    • Current: United States

                    #10
                    I had TAP1 chip (15 HP according to their site) in my 91 CQ 20V 7A, with big MAF (? HP) , and bosch injectors (5HP) and tubular header (5-6HP)
                    The car was night and day compare to a stock one.
                    sigpic

                    Comment

                    • John.
                      S2Forum Fiend
                      • May 2012
                      • 2615
                      • Country: Scotland

                      #11
                      I have different injectors and chip......switchable back to standard.
                      Difference noticeable when driving, haven't had it on a rolling road.
                      I'd be interested to hear more of what folk have done regards the air flow sensor and throttle body.

                      Comment

                      • ACQ
                        S2Forum Enthusiast
                        • Jun 2008
                        • 141
                        • Country: Lithuania

                        #12
                        In this car where was this ecu installed, also was ported intake maifold

                        Comment

                        • Nj
                          S2Forum Possessed
                          • Jan 2007
                          • 3420
                          • Home: Scotland Current: Finland

                          #13
                          john, what chip did you get and where from? and what injectors did you get?
                          looks like it might be worth a bit of tinkering to squeeze a little more power (famous last words)
                          --------------------------------------------------------------------
                          1990 CQ20v
                          2001 3.0 B6 A4 Avant Quattro Sport

                          Comment

                          • John.
                            S2Forum Fiend
                            • May 2012
                            • 2615
                            • Country: Scotland

                            #14
                            Originally posted by Nj
                            john, what chip did you get and where from? and what injectors did you get?
                            looks like it might be worth a bit of tinkering to squeeze a little more power (famous last words)
                            Sorry I can't say exactly what spec they are but have PM'd you to explain!

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