Just from experience, not from googling their numbers :) : 2.9 is adequate on flat terrain, but does feel less torquey than the others 3.2 is fine for a cruiser and does not feel THAT much 'weaker' than a 4.0 does, especially when you know how to work the J gate 3.6 feels similar to the 3.2, but is ...
...suggestions as to how to do that? I never came across any details how to (re)set that EPROM... IMHO, your best bets are an XJ40 model specialist like David Marks in Nottingham (http://www.davidmarksgarages.co.uk/specialistservices), or an old-school electronics specialist. Picture of what I gues...
And all the best to you, Don! Hope your stockings will be chock-a-block with chockies!!! :D Best wishes to all XJ40 (and 81 ;) ) enthusiasts from the locked down Lowlands, wishing you all a healthier, better and more-exciting-but-in-a-good-way start of the New Year! Feline festive season pic include...