hi - thanks for input . I think you are right re lean loaded cell. The battery voltage is 14.2volts, the loom is new and one of yours so imagine the voltage at the ecu is ok. (Don't really want to take ecu plug apart as it's lovely.
It is not lean at the topend the problem I have had is the leaning out on fan operation. I have by luck a chip (One of five) that does not have this leaning fan problem, its quite amazing really it idles @ 14.5 afr see 12.3 till 19psi till 6000 rpm then dumps more fuel in till 7000rpm @11.9afr.
Its been tested for det - temps etc - I don,t think you could get much better with a live map!!!


Happy days really.


Tim.