Originally Posted by chip-3door
Certainly looks lean.
Have been in the car though (that night in fact!) and it certainly wasnt lean on the wideband monitor he has installed cause i was specifically checking when he took me out in it cause i find such things interesting due to being a techy nerd, lol!
blocked injector maybe?
rings on that cylinder not sealing (poss due to bore wash) allowing oil in which lowers the octane rating and encourages DET
At a bit of a loss to be perfectly honest Si!
The bit I've highlighted in bold seems a possibility...
The fooked bore was full of oil - could it be so clean because it has always run lean, or could the oil maybe have somehow cleaned it? The other bores with no oil in seem to be fairly evenly sooty / coked up.
AFRs on boost always seemed dead on what Karl had mapped it too - a safe 11.1:1 most of the time, and the car has been THRASHED a lot with no probs up until that last high speed run...
hmmm