So did a couple of runs this morning, 1997 S8, about 40% of fuel , myself about 70kg and full size spare. Couple of things before I post times, first the car being older and without CAN sampling rates are a lot slower over KKL so accuracy is +/- 0.5s instead of +/-0.1s for Delboy. Secondly I have bigger tyres 255/45R19 instead of 245/45R18 so ECU see less speed than actual.
First order of business was to determine difference between actual speed and what ECU see. So I set GPS to km/h as the VCDS show speed in km/h in measuring blocks. Travelling at steady speed of 100km/h VCDS reading was jumping between 92.2 and 93.4km/h. So I took 100/93=1.075269 to find a mutiplier, which means that with actual speed of 60mph ECU only see 60/1.075269=55.8mph
I set the acceleration time to be measured 0-56mph, highlighted in bold below, this will be actual speed of 60mph. Here are the 2 results from 2 runs on the same piece of tarmac in opposite directions, not bad for 18 year old car with a book time of 6.8s
Sunday,21,June,2015,06:55:23:53046
Control Module Part Number: 4D0 907 557 N Component and/or Version: 4.2L V8/4V MOTR AT D01
Metric units
0 to 100 km/h: 7.4 +- 0.52s
400m: 15.1 +- 0.51s, @150 km/h
0-93 km/h: 6.6 +- 0.50s
200 meters: 9.8 +- 0.52s, @117 km/h
US Units
0 to 60 mph: 6.8 +- 0.50s
1/4 mile: 15.2 +- 0.51s, @93 mph
0-56 mph: 6.3 +- 0.50s
660 feet: 9.9 +- 0.52s, @73 mph
Sunday,21,June,2015,07:01:34:53046
Control Module Part Number: 4D0 907 557 N Component and/or Version: 4.2L V8/4V MOTR AT D01
Metric units
0 to 100 km/h: 7.0 +- 0.50s
400m: 14.9 +- 0.51s, @150 km/h
0-92 km/h: 6.1 +- 0.50s
200 meters: 9.6 +- 0.50s, @116 km/h
US Units
0 to 60 mph: 6.5 +- 0.50s
1/4 mile: 14.9 +- 0.51s, @93 mph
0-56 mph: 5.9 +- 0.50s
660 feet: 9.6 +- 0.50s, @73 mph
And here is graph of the first run with speed converted to mph and multiplied by 1.075269 to show real speed
