All cars since 1994 in the U.S. have had built in data acq
through what is known as OBD II. OnBoard Diagnostics.
You can monitor what is going on in real time.
Here is a sample of the data out of my Cougar 4.6L V8
climbing a hill near my house. I gathered this
data with a note book computer running Windoze through the RS232
and CarComp software. Note the first column is time.
I think the last column is a bit suspect as it is supposed to be
a calculated percentage of power what ever that is.
Perhaps max power available at that RPM.
The new RX8 must have this OBD stuff so perhaps we can take
advantage of it somehow.
About a dozen different parameters can be monitored in real
time with the right software. The car computer must output
this as well as manage the engine EFI/IGN and all the smog
stuff as well all in real time.
Paul Lamar
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/ http://www.linux.org
Time RPM\r/min Speed\MPH MAF Sensor\lb/min Load\%
164.17191 796 0.0 2.860 61.200
164.83200 1284 0.0 4.070 74.500
165.53909 1576 2.0 5.170 80.400
166.26170 1848 6.0 5.920 78.800
167.03130 2048 10.0 6.980 83.100
167.78909 2352 14.0 8.210 85.100
168.56250 2680 17.0 9.260 82.000
169.33200 3056 20.0 10.360 84.300
170.05080 3392 23.0 11.010 80.400
170.71091 2720 26.0 8.280 92.200
171.47270 2440 29.0 8.980 92.900
172.19141 2536 31.0 9.470 92.200
172.96091 2648 33.0 9.650 92.200
173.73050 2736 35.0 10.090 91.400
174.50000 2864 37.0 10.660 90.600
175.26170 2976 39.0 11.010 90.600
176.08980 3088 41.0 10.480 82.000
176.91020 3152 43.0 10.290 80.800
177.74220 3232 45.0 10.560 84.300
178.39059 3328 46.0 11.410 88.200
179.10941 3408 47.0 11.630 87.800
179.71091 3472 48.0 10.970 80.800
180.37109 3536 49.0 10.750 76.500
181.03130 3568 50.0 8.490 57.300
181.69141 3280 51.0 7.630 75.300
182.46091 2392 51.0 6.410 71.800
183.23050 2384 51.0 6.800 72.500
184.00000 2368 51.0 5.620 60.400
184.82030 2304 51.0 6.830 85.100
185.58980 2392 50.0 8.250 91.000
186.35941 2368 50.0 8.600 94.900
187.12891 2424 49.0 8.820 94.100
187.83980 2424 49.0 8.880 94.100
188.60941 2456 50.0 9.050 94.900
189.33200 2504 50.0 9.080 94.900
190.08980 2536 51.0 9.190 94.900
190.81250 2552 52.0 9.500 94.900
191.58200 2584 52.0 9.500 94.100
192.35159 2600 53.0 9.740 94.900
193.10941 2640 53.0 9.700 94.900
193.87891 2672 54.0 9.890 94.900
194.65230 2688 55.0 9.810 93.700
195.42191 2712 56.0 10.050 93.700
196.19141 2736 57.0 9.540 91.400
196.96091 2728 57.0 9.150 83.900
197.78130 2688 58.0 7.800 74.500
198.55080 2664 58.0 7.790 76.500
199.37891 2648 57.0 8.390 82.400
200.15230 2608 57.0 8.200 83.100
200.91020 2528 56.0 7.700 94.100
201.67970 2184 56.0 7.700 94.100
202.44920 2208 56.0 7.660 94.900
203.22270 2160 56.0 7.660 94.900
203.94141 2152 56.0 7.200 83.100
204.69920 2024 56.0 4.740 59.600
205.47270 1832 55.0 3.400 42.000
206.24220 1712 55.0 3.420 52.900
206.96091 1760 53.0 4.980 69.800
207.73050 1880 53.0 4.600 66.700
208.49220 1824 52.0 4.370 62.000
209.26170 1776 51.0 4.110 61.200
210.03130 1736 50.0 3.150 36.100
210.75000 1600 50.0 2.170 26.700
211.51170 1520 48.0 1.720 16.900
212.17191 1440 48.0 0.970 12.500
212.83200 1320 47.0 0.790 11.800
213.49220 1264 45.0 1.250 34.500
214.10159 1384 44.0 2.600 54.900
214.81250 1496 43.0 3.950 65.100
215.58200 1640 43.0 4.000 65.100
216.28909 1648 43.0 3.610 58.000
217.06250 1568 43.0 3.030 49.000
217.78130 1472 43.0 2.060 22.400
218.49220 1356 43.0 1.130 16.100
219.15230 1272 42.0 0.790 13.300
219.85941 1104 40.0 0.740 14.100
220.51950 1008 37.0 0.710 16.100
221.24220 836 33.0 0.670 18.800
222.01170 704 27.0 0.650 17.600
222.72270 800 22.0 0.660 47.800
223.49220 840 20.0 1.810 58.800
224.15230 1132 18.0 3.510 69.000
224.85941 1464 17.0 3.940 74.500
225.58200 1488 17.0 4.530 75.300
226.28909 1584 18.0 4.640 75.300
227.00000 1624 19.0 5.050 78.000
227.72270 1680 20.0 5.050 78.800
228.49220 1712 20.0 5.620 82.000
229.19920 1800 21.0 5.310 76.100
229.97270 1760 22.0 4.980 73.700
230.67970 1712 22.0 5.170 81.200
231.40230 1776 22.0 5.490 78.800
232.17191 1792 22.0 5.520 79.600
232.87891 1800 23.0 5.570 73.300
233.65230 1720 23.0 4.000 66.300
234.35941 1576 23.0 3.080 49.800
235.08200 1400 23.0 2.240 30.600
235.78909 1192 22.0 1.150 20.400
236.44920 924 20.0 0.790 19.600
237.22270 788 19.0 0.710 20.800