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Birdman's Back To Front XE Build

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  • Glad to see you're getting back on this, would be good to see you out in it next year - join us for a trackday or two maybe? Throttle bodies will sound awesome!
    my build: http://www.16vminiclub.com/forums/showthread.php?t=4887
    https://youtu.be/X7O46JmFPh0

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    • Originally posted by gazwad View Post
      Glad to see you're getting back on this, would be good to see you out in it next year - join us for a trackday or two maybe? Throttle bodies will sound awesome!
      Thanks Gary. We will see if it works out.. Engine issues to be addressed first / rebuild, then upgrades. Would be good to get a power run done at dyno on old induction and then again after on ITB's. I'm thinking about Shrick 276 Cams maybe.

      Just spent first day cutting and grinding on the frame build for the Saab mini. Went quite well.. I will update that build thread soon.
      Last edited by Birdman; 22-09-2021, 06:25 PM. Reason: typo
      Whale Oil Beef Hooked!
      (use Irish accent)

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      • So the 2nd hand Megasquirt turned up in the post for £100. All seems v good condition inside the casing. It is a Megasquirt 2 version 3.0.. So not the latest, but not the v early ones with obsolete processor. Will have a fair bit of functionality. Next up, get a cable and download Tuner studio to see what project map is currently loaded, I also need to identify a few fly-lead wires on the main Bosch connector that goes between the ECU and the standard XE loom.. 4 are connected to a relay, so that may be either be for coil or fuel pump , the other 2 I don't know. Probably understand a bit more when can see the map. See if it was configured for a MAF, like std car or another sensor. Anyway, happy for now... 20210925_085823.jpg 20210925_085833.jpg 20210925_085807.jpg
        Whale Oil Beef Hooked!
        (use Irish accent)

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        • Downloaded Tunerstudio and Mega Log Viewer yesterday. Wow, there is a lot to learn. Good job this is a longer term project. Set about trying to work out the wiring and pinouts on the short loom from Megasquirt to Bosch Motronic 55 pin connector. Worked out what many wires do, but very difficult without serious magnifying glass to see what pin numbers have been soldered. I think I will have to break out the test meter and ring through to the front pins, because impossible to see what is really going on , on the backside of the 55 pin multiplug. My eyes are shot. I have read in the Megasquirt manual, that there is an ITB mode that takes MAP for some of the rpm range and I think Speed Density for the lower RPM range. This was created because ITB's can give crazy vacuum fluctuations at lower throttle openings. So I think I will be using that, TPS and Engine speed for main sensors, with CTS etc for correction.
          Whale Oil Beef Hooked!
          (use Irish accent)

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          • OK, spent the other night with test meter ringing through the 55 pin connector and have worked out what the 16 or so wires on the short harness to Megasquirt are for. So it all seems wired correctly with Sensors: TPS, CAS and CTS wired to the connector and two fly leads that would connect to O2 Sensor and MAT. Then there is the inbuilt MAP sensor actually in the Megasquirt. So that should facilitate everything fuelling wise. I don't think I will know how ignition was being controlled until I start up the ECU through tuner studio though.. Bought serial to usb coms lead for that, but now seems have to power it up as well.. Not sure if I should get a JimStim to facilitate that and to test the ECU is handling signals from Sensors.
            Whale Oil Beef Hooked!
            (use Irish accent)

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