Re: New XR6T running rich
I recently had a unichip installed in my NA XR6. Part of the process was a pre and post dyno. They checked the air/fuel ratios as a standard part of it, since they tune the car to optimum fuel efficiency. I was told that all cars, namely Fords, come out of the factory running rich - partly because the engines are all different and are not tuned individually for optimum fuel usage and also because it is safer to run them richer for warranty purposes, on the assumption that not all owners are going to drive well or look after their cars and that running them leaner can cause burning....
Some of the BAs are apparently worse than others in this regard - mine was pretty bad. Once the chip was installed and the a/f ratio fixed, it was much better - economy and performance. You could just have it run on a dyno to check the a/f ratios.....
Your black residue would be likely due to a rich mixture - I would get it checked if I were you. And perhaps forget Optimax - its crap. Its also only 95 ron - plenty of people have trouble with it - try Mobil Synergy 8000 or BP Ultimate (both are 98 ron I think) - the guys who did my chip recommended the BP and confirmed my opinions on the Shell rubbish.
Hope this helps!
2003 BA NA XR6, Silhouette, manual, sunroof, premium audio, alarm, window tint, scuff plates, Navman (in TIMEOUT (tm))
JMM DEV3 BA kit
2.5 inch cat
2.5 inch exhaust
Air intake conversion/pod
14.80 @ 95.33 mph
Founder MTAS (Manual Transmission Appreciation Society)
Founder Society Against Stupid SMS Language
O.F.R. # 138