91 20v 90q "it's time"

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  • 20vB3
    S2Forum Hobbyist
    • Mar 2014
    • 10
    • Country: United States

    #1

    91 20v 90q "it's time"

    hello all, i am new here on S2 but have been on motorgeek for some time now. i ended up here with hope of finding more info needed to complete my transformation, make new friends, and learn even more. with that said here is a quick catch up on my project.

    last February i acquired a 91 90q 20v from a friend, had a blast driving it most of the year then decided i needed to make it even more fun, so i tore into it with plans of boost and better handling. took it from this...





    and now it sits like this



    at least for the most part. as of now the wiring harness has been removed and it sits on coil overs, engine bay is painted, abs/air bag/ cruise/ heated seats have all been removed. i decided i would swap in a 3b for now as my desires for the 7a are a bit extensive and i pulled a running 3b along with the harness and ecm out of my 200.
    the plan is to lighten the flywheel and freshen it up a bit.( a few gaskets here and there) then drop it in and enjoy while i prepare the 7a.

    that being said, i am at the wiring stage. trying to figure out the 200 harness and get it to mate with the 90. the stuff under the hood is of no concern to me as i can figure it out and remember what most of it is. my issue is on the interior, connecting to the cars harness and fuse/relay panels. i have searched high and low and i seem to find almost everything about this swap except for the stuff i am looking for, i've seen a lot of people use the S2 harness but that isn't an option for me. i have lived in the Bentley books for both cars for some time now and gathered a lot of information also. when it comes down to it i am just not that good at deciphering whats what and where i need to put or cut it. i have fed the 200 harness into the 90 and lain it out as it was it the 200 so i can get an idea of what needs to go where. i deciphered what wires go in which direction i just can not figure out where exactly they need to end up. i hate to be "that new guy" who asks questions in his first post but with this being the issue that is holding me up i really need some help. thanks for looking and thanks in advance for any and all help. i hope to end up a good addition to the group and look forward to new friendships and learning new information.
  • 20vB3
    S2Forum Hobbyist
    • Mar 2014
    • 10
    • Country: United States

    #2
    also, the name "it's time" was given to this project because i was sitting with my girlfriend watching a movie and spontaneously stood up, said, "it's time" and began to tear into it.

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    • simon20vq
      S2Forum Extremist
      • Dec 2010
      • 1379
      • Country: United Kingdom

      #3
      LOL I bet she was disappointed

      Comment

      • 20vB3
        S2Forum Hobbyist
        • Mar 2014
        • 10
        • Country: United States

        #4
        ^lol

        Comment

        • 20vB3
          S2Forum Hobbyist
          • Mar 2014
          • 10
          • Country: United States

          #5
          To be honest I dont completely understand the Bentley wire diagrams. Xan figurenout he basics but they get confusing to me

          Comment

          • WidowmakerS2
            S2Forum Addict
            • Oct 2007
            • 354
            • Current: Norway

            #6
            I've done this a few times.
            If you can pm me Your email, I'm sure we can work it out together.
            If at first you don't succeed, destroy all evidence that you tried.

            -CQ 3b "S2".

            Comment

            • 20vB3
              S2Forum Hobbyist
              • Mar 2014
              • 10
              • Country: United States

              #7
              Ok so I have been talking with Paul from S2central and slowly we are getting this figured out. Still if anyone has any info on this please share. It seems the 200tq engine harness has some extra stuff not needed in the b3 chassis and that some of the connections may not match up. Could use any help and feel that all this information needs to be compiled into a sticky for those who attempt it down the road.


              @widowmakerS2 pm coming your way.

              Comment

              • UrS4boy
                S2Forum Obsessed
                • Feb 2006
                • 11859
                • Country: Canada

                #8
                20vB3: I am surprized that the Motorgeek boys couldn't help you. There have been several 7A to 200 20Vt 3B conversions completed in the US. Did nobody document the wiring issues/solutions there (at Motorgeek)?

                I have some AAN to B3 info stored somewhere but not very much 3B info. All I can provide at this time is the 200 20VT 3B T55 ECU connector pin-out (which you probably have). (Sorry no wire colours)



                And this from Paul N. (probably 3B in an S2 though)

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

                Comment

                • 20vB3
                  S2Forum Hobbyist
                  • Mar 2014
                  • 10
                  • Country: United States

                  #9
                  I did not have the ecm pin out. So thank you for that! The other schematic Im pretty sure Paul has. I have been writing things down and chasing wires and Paul has been pointing me in the directions to look.

                  I am surprised myself that nobody on motorgeek has helped, I have searched several build threads where the 3b was swapped into the b3 90 sedan using the 200tq harness but everyone leaves out the details of what was done on the wiring end.

                  Comment

                  • 20vB3
                    S2Forum Hobbyist
                    • Mar 2014
                    • 10
                    • Country: United States

                    #10
                    well with the help from Paul there is now a few things connected. all fuse panel connections are in place but now is the hard part.. the 200 used a different colour plug for the main engine harness that is also reversed in sex from the 90 7a harness... trying to figure out what gets spliced to what is a big pain in the ***. while the 200 3b harness runs straight to the cluster, the 90 7a harness has a good bit of various connections in between. a few of the wires matched(according to my Bentley manuals) but some also don't make since as to where they go and colour. seems like for the most part both cars are wired *** backwards from what i can tell. hopefully this can be figured out soon so i cant put my interior back together and move on to a new clutch and dropping the 3b into the 90.

                    Comment

                    • GazzaG60
                      S2Forum Freak
                      • Mar 2007
                      • 4133
                      • Country: United Kingdom

                      #11
                      The 16v harness also has some different plugs. Some round where the any is square.
                      Im working on it but it may be a matter of see what works and move it on from there.

                      Comment

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