Hi

The Simens Simtec is definetly the 56.1 (the earlier version) and either 56.4 or 56.6 for the later version.  Either way Simtec 70 / 90 is incorrect - at least for the Vauxhall fitment.  I have the 56.1 in my 1995 Cavalier.

I am afraid that I cannot help with editing the map for fueling - I am not into mods like this.  Would you gain any noticeable improvement though?  I would have thought that other areas would also require attention like the cams, engine breathing etc although you may well of course already have done this.

Hope the ECU info helps though.

seems very cheap..