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Graphs 1&2 show raw data and smoothed interpolated values. Even with the greater smoothing factor the values well represent the data points. Graph #3 shows values re-interpolated on uniform speed points so that an average could also be displayed. For any given gear, engine speed is a function of the car's speed. Graph #4 is the same as #3 except speed is displayed as engine speed.

average values
mph, mph/sec, mph/sec^2
14 2.10 0.023
15 2.11 0.015
16 2.13 0.015
17 2.14 0.016
18 2.16 0.020
19 2.19 0.029
20 2.22 0.041
21 2.27 0.050
22 2.32 0.064
23 2.40 0.080
24 2.48 0.091
25 2.57 0.094
26 2.67 0.091
27 2.76 0.086
28 2.84 0.080
29 2.92 0.077
30 2.99 0.081
31 3.08 0.093
32 3.18 0.108
33 3.30 0.123
34 3.43 0.136
35 3.57 0.146
36 3.72 0.154
37 3.88 0.162
38 4.04 0.167
39 4.21 0.167
40 4.38 0.164
41 4.54 0.159
42 4.69 0.150
43 4.84 0.140
44 4.97 0.129
45 5.10 0.118
46 5.21 0.106
47 5.31 0.095
48 5.40 0.085
49 5.48 0.076
50 5.55 0.068
51 5.61 0.060
52 5.67 0.052
53 5.72 0.043
54 5.76 0.033
55 5.78 0.025
56 5.81 0.017
57 5.82 0.009
58 5.82 -0.001
59 5.82 -0.012
60 5.80 -0.021
61 5.78 -0.028
62 5.75 -0.033
63 5.71 -0.036
64 5.67 -0.038
65 5.63 -0.041
66 5.59 -0.043
67 5.55 -0.044
68 5.50 -0.046
69 5.46 -0.050
70 5.40 -0.057
71 5.34 -0.062
72 5.28 -0.066
73 5.21 -0.069
74 5.14 -0.072
75 5.07 -0.075
76 4.99 -0.078
77 4.91 -0.081
78 4.83 -0.084
79 4.74 -0.088
80 4.65 -0.093
81 4.56 -0.099
82 4.46 -0.105
83 4.35 -0.112
84 4.23 -0.117
85 4.11 -0.119
86 3.99 -0.117
87 3.88 -0.112
88 3.77 -0.105
89 3.67 -0.098
90 3.58 -0.089
91 3.49 -0.081
92 3.41 -0.075
93 3.34 -0.071
94 3.27 -0.069
95 3.20 -0.069
96 3.13 -0.068
97 3.06 -0.067
98 3.00 -0.065

 

Problem is, I'm graph-deficient . . . any chance we can get explanations as to what this data mean in laymans terms?

 

They're used to compare different set-ups & conditions.

 

I know that . . . Iguess what I'm looking for is the bottom line

 

Ditto

 

Are the wild swings in accel. (before smoothing the data)just artifacts, or is there a reason for such instant-to-instant variation?

 

Mostly I think it has to do with resolution of speed (40 rpm) and unconstrained timing error.

 

This is one benchmark. Variation in response at low speed may be due to not having the engine come to equilibrium before starting test. Unsure why jerk is rising at upper end. Originally this car looked surprisingly slow compared to my stock car. However it may be due simply to temperature and/or altitude. Need to get more data files.

 

I found a true flat, straight road for the logging this time. The other data was close to flat, but not quite.

Thanks for taking the time to put this together. Would you mind sending me the spreadsheets? I'll then be able to use the same formalae in future logging attempts without bugging you. :-)