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      11-28-2009, 04:36 PM   #25
chylld
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Drives: G08 iX3
Join Date: Sep 2009
Location: Sydney, Australia

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29/11 UPDATE

So I did some more runs last night and much to my delight, I got some much better results:

7.89 +/- 0.25 (compared to a previous average of 9.23 +/- 0.47)

After studying the graphs very carefully, I've concluded that the improvement is due to a combination of the following 2 factors:

1) Calibration of the dynolicious app. Yesterday morning I had calibrated the app before I set out, but it turns out the accelerometer in the iPhone is very sensitive to temperature changes, so in reality we probably needed to re-calibrate it every 10 minutes.

2) Heat of the air. Our morning runs were recorded in near 40 degree heat, while last night's runs were at 30C.

Now if we make the following assumptions:

1) The app was not calibrated properly
2) The heat of the air did not have a significant effect on engine performance
3) Our method of using the stopwatch was inaccurate

then I am pleased to present the corrected times:

Auto:
stock, 1 person on board: 8.50 +/- 0.16
pbx, 1 person on board: 8.00 +/- 0.34
pbx, 2 people on board: 8.56 +/- 0.09
best run, 1 person on board: 7.53

Manual:
stock, 2 people on board: 7.50 +/- 0.40
pbx, 2 people on board: 7.33 +/- 0.30
best run, 2 people on board: 6.75

I estimate the 0-100 for the manual with only 1 person on board to be ~6.3s.
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