Thanks for the input both

Hmmm - I like very much the idea of closed loop ecu - apart from anything else, it does somewhat eliminate the need for concern about running too lean.

I had not thought about going to greys - is there no concern on bore wash at low rpm/ low speeds?

Can closed loop lambda be added to any L8? or is this only for the ones which were fitted with cats as standard... Also, does the closed loop use wide band, or narrow band?

So many questions!! Thanks for the help though, exciting times!

Alvyn, I am from deep in the Westcountry - If you see a battlescarred white sapphire cosworth in the Exeter or surrounding area, its probably me!!!!