The nnn ecu appeared before July 2002 as did the euro 3 engine i know this because I have one here all factory original engine and ecu 🖒
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In addition, Phil (DiscoWhite) sold the Discovery in question the year after (back in 2011) to me. It's fuel economy is still weird - still gets about 450 to 550km to a tank but that's running 33" with the roof rack and all the other heavy gear on it. Changing the diff ratios, tyre size, ECU tune, fitting a VNT, larger intercooler etc. have not had any positive or negative effect on the fuel economy, nor does driving type or style (e.g. highway commenting, city driving or towing are all the same).
WOW I've had the D4 now for 7years, I drove Phils D2-A for a week and managed to get better economy than Phil ever did, he had a lead foot, those fuel figure are great twr7cx with all you've done especially given you're on 33s, Phil never got anywhere near that from memory.
With mine changing from the msb to the nnn ECU made a difference straight away, with a bigger intercooler, re-map, upping the boost, 32s, best economy I got was low 10s constantly to and from work, loaded with the camper mid 12s to low 13s.
Anyway sold the old girl with 320,000ks on it, still miss it.
Baz.