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Originally Posted by Disco
You can drop in a 4.6 either GEMS or otherwise, but you will need a computer system a lot more sophisticated to piggyback your ECU than a couple of chips (Motec preferably), or,
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Disco, Explain what you mean by 'need to piggyback'. I have seen very little Motec use in the US. 5 or 6 years ago, It was generally considered a good (at least the M8) computer to replace Chevy (GM) systems, and I do know of a Rover application, but no one I know thouight they got any gain from it (except that the guy with the Rover needed a whole system and the Motec was cheaper) In all cases I know, it was used in place of, and not piggybacked.
As to GEMS 4.0 to GEMS 4.6 upgrade, It isn't even necessary to rechip the old GEMS computer, except that nothing will be gained. ONLY the fuel chip Has to be changed, but the timing maps SHOULD be changed. NO other ECU, piggybacked or otherwise is necessary.
HOLDEN may have improved with MOTEC, but SAGEM is far faster, adaptable, and (matter of opinion here) efficient. I always figured ROVER, by all their security "enhancements" were the only reason GEMS got a bad name, in the US. Outside of the US, I believe the securities, and lockouts are not used.
If it was my truck, and I was looking to upgrade from the 4.0 Gems to something else (I hope my friends would at least ask me why, I can't think of too many reasons in a 5000 lb truck) presumably a 4.6, I'd go the whole way and transplant the BOSCH loom and ECU.
