Mike at Powerchip's own analysis:
Quote:
Originally Posted by Mike@Powerchip
Just analyized the results and according to the data, it seems as if a dyno variable was modified inbetween the two runs which produced an inaccurate gain.
The first two graphs are cars that Jeremy dyno tuned himself from our Texas trip. You can see how the gain on the bottom end of the OP's new dyno is artificial.
Furthermore, the bottom graph shows the deviation. You can see that the third graph has an extremely low deviation and that further supports the presumption that a correction factor was applied, or an input variable was changed - causing the skew of the entire curve upward, instead of reflecting actual power related gains.
You can see the first two graphs have trouble with gain between 4000 and 5500, and then have a sizable gain through the midrange and top end. You can see the large gap inbetween the two curves on the third gap, which is not representative to how an M3 responds to tunes in that area. Also notable is that the largest increase in horsepower is between 4000 and 5500 RPM, which conflicts with the previous two cars that achieve their highest gain at later RPMs, and have the lowest gain at lower RPM's. The only thing that can explain this is an unwarranted correction to the graph to skew the results.
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