The ECU is a JDM, which is supposedly tuned to better ratios between fuel and performance, although I suspect the difference will be noticeable with a SVX. I'll find out soon enough. I think Smallcar can tune ECUs. Give them a call if interested. They are a great source of knowledge.
I taped copies of the diagrams for the 1989/1989 together and highlighted the tracks. I also had relevant pages with highlighted tracks scattered around the panel. I also had a binder of the schematics handy yet still had to pull out the Bentley occasionally.
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Freedom van Go
1989 Westy, 3.3L SVX
Duncan