Fair point, Dai...what I meant was that monitoring AFRs on-load is essential. That's perfectly possible on-road with the right kit...it's exactly how we (petrol) mapped the 740 Turbo.
The trouble with pre-wideband cars is that you have no idea what the car is doing on full load unless you add a wideband (in the tailpipe, or better still via a bung in the downpipe). Assuming the ECU has it sorted it risky, in my experience. The Landi system I had had an RPM vs Load map which would need adjusting with the aid of a wideband. Obviously that's not an issue for something more modern (like the XC90) with a factory-installed wideband.
cheers
James
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