Quote:
Originally Posted by Stl-986
I was going to add that some of the things we may ask about or have you try might not work for you since you have a ROW car.
for LTFT I would just check it every now and then for a bit and see how it trends. Might take some good drives to see any difference.
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RoW - Rest of the World?
My chassis number decodes as
WP0ZZZ98Z1U6XXXXX
W - Germany
P - Porsche
0 - Sports car
ZZZ - Europe/RoW
96...6 - 986
Z - Europe/Row
1 - 2001
U - Uusikaupunki Valmet factory (Finland), Boxster 97-2010
So strictly it is Europe/RoW, but I see that you are distinguishing between US and RoW.
Fuel Trim
The fuel in the UK changed from E5 for regular unleaded (95 RON) to E10 this summer, unfortunately for me that also coincided with the CAT and O2 sensor changes and the start of my problems. We can still get E5 premium unleaded, Shell V-Power (99 RON), I have never really used it, I did try a tank a month ago, but it made very little difference. Perhaps now it is running better, I would notice the difference.
E10
I think I have got the LTFT wrong for E10, as E10 is a higher fuel to air ratio the LTFT should be +4% not -4% as I thought in the last post. Shell say the V-power is 4% more efficient, so this ties in.
The good news for me is that my LTFT have come back up, bank 1 is now 0.0% and bank 2 is -1.5%. I somewhat agree with Stl-986, ignore the values of FT, just check it now and again, after all if it is running well, why worry?
I have learnt quite a bit about how a modern car sets it's fuel usage, it has been interesting, most of my real experience with this comes from motorbikes from the 70s and 80s, then you just looked at the plugs and fiddled with the air screw or jet on the carb.
Robin
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