Zcardude Posted August 19, 2020 Share Posted August 19, 2020 Hi everyone, I'm running an MS2 3.57 running MS2 Extra 3.4.3 on a 1983 L28ET in a 1973 240Z. I just finished completely rewiring the engine with a new harness as the previous install was hack job by the previous owner. I recently did some work on my car, upgrading it to use a diyautotune optical trigger disc as well as eliminating an unnecessary CDI box. I have it running pretty well (just moving it around the driveway so far, haven't driven it fully yet) but had to use a strange "Tooth #1 Angle(deg BTDC)" trigger angle setting. It seems very healthy compared to the previous wiring job: it fires right up dead cold and just sits there and runs, previously it was very angry cold. I was mostly following the information on https://www.diyautotune.com/support/tech/hardware/nissan-trigger-disc/ but I did not create a second input for the cam, I am only doing crank input for now. For my new setup, I am using a "Tooth #1 Angle(deg BTDC)" trigger angle setting of 285 degrees. When I set this angle, my timing light matches up exactly with the calculated spark advance. DIYAutotune recommends 345 degrees. When I tried 345 degrees, the car would not run at all, I think that the timing was just way too far off. Before installing the DIYAutotune optical trigger disc, looking at my old tune, my "Trigger Angle/Offset(deg)" was 52.3 which I believe was also sort of a weird setting. So my question is: Is it normal to have such wildly varying trigger angles from what lots of other people have and what online guides recommend? Does this mean my distributor drive is potentially installed improperly? Does any of this matter if I am able to get the correct advance out of my timing light? I ask because I know the engine is a rebuild that was already running on megasquirt when I bought it and I don't know if this is something I need to resolve. It had some weird ignition problems before but the wiring was a disaster. I want to know where to look next if there are more ignition issues or if this can cause problems. I can post some MSQs if that's helpful. Thank you! Quote Link to comment Share on other sites More sharing options...
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