phil wrote:

  Paul, anyone?

    How accurate can a person be calculating the HP via these new auto
computers?  I've seen a few units for Palm and Pocket PC that plug into
the OBDII port.  Would you use the factory rx-8 computer (factory OBDII
port) or switch to something else (maybe no port)?  Could they be used
in an aircraft to show HP?

 Thanks.

 Phil Williamson
 Oregon City, Or.

Depends on the data coming out in real time. One of the outputs is intake
manifold pressure so that along with RPM can be used to calculate HP.
Also MAF data is available along with mixture. Looks quite feasible. 
Here is some real time data from my 94 Mercury Cougar OBD II connector.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.

"Time","Air Flow - MAF Sensor\lb/min","Binary","Time","Throttle Position\%","Binary","Time","Ign. Advance #1 cyl.\deg.","Binary","Time","Vehicle Speed\MPH","Binary"
0,.68,2.007813,65342.05,19.2,49,.109375,22,172,.3320313,0,0
0,.68,2.007813,65342.05,19.2,49,.109375,22,172,.3320313,0,0
.5507813,.67,1.992188,.8320313,19.2,49,1.050781,22,172,1.210938,0,0
.5507813,.67,1.992188,.8320313,19.2,49,1.050781,22,172,1.269531,0,0
1.492188,.66,1.960938,1.710938,19.2,49,1.929688,22,172,2.089844,0,0
1.492188,.66,1.960938,1.710938,19.2,49,1.929688,22,172,2.140625,0,0
2.359375,.67,1.992188,2.582031,19.2,49,2.800781,22,172,2.96875,0,0
2.359375,.67,1.992188,2.582031,19.2,49,2.800781,22,172,3.019531,0,0
3.242188,.67,1.976563,3.460938,27.8,71,3.679688,12.5,153,3.898438,0,0
3.242188,.67,1.976563,3.460938,27.8,71,3.679688,12.5,153,3.898438,0,0
4.121094,2.2,6.511719,4.339844,27.8,71,4.558594,25,178,4.78125,2,3
4.121094,2.2,6.511719,4.339844,27.8,71,4.558594,25,178,4.78125,2,3
5.058594,3.57,10.53516,5.28125,35.7,91,5.5,27.5,183,5.660156,7,11
5.058594,3.57,10.53516,5.28125,35.7,91,5.5,27.5,183,5.710938,7,11
5.929688,4.11,12.14453,6.148438,35.7,91,6.429688,29.5,187,6.648438,12,19
5.929688,4.11,12.14453,6.148438,35.7,91,6.429688,29.5,187,6.648438,12,19
6.921875,4.76,14.07813,7.140625,37.6,96,7.359375,32,192,7.582031,17,28
6.921875,4.76,14.07813,7.140625,37.6,96,7.359375,32,192,7.640625,17,28
7.910156,6.3,18.625,8.191406,43.5,111,8.410156,30.5,189,8.570313,22,36
7.910156,6.3,18.625,8.191406,43.5,111,8.410156,30.5,189,8.628906,22,36
8.851563,7.26,21.45703,9.121094,44.7,114,9.339844,26,180,9.558594,27,44
8.851563,7.26,21.45703,9.121094,44.7,114,9.339844,26,180,9.558594,27,44
9.832031,6.58,19.44531,10.05078,66.7,170,10.26953,27,182,10.49219,32,52
9.832031,6.58,19.44531,10.05078,66.7,170,10.26953,27,182,10.55078,32,52
10.82031,7.11,21.00781,11.03906,54.9,140,11.32031,28.5,185,11.53906,37,60
10.82031,7.11,21.00781,11.03906,54.9,140,11.32031,28.5,185,11.58984,37,60
11.87109,7.26,21.45703,12.08984,48.6,124,12.35938,29.5,187,12.58203,42,67
11.87109,7.26,21.45703,12.08984,48.6,124,12.35938,29.5,187,12.64063,42,67
12.91016,7.66,22.64844,13.12891,44.7,114,13.39844,31,190,13.57031,45,72
12.91016,7.66,22.64844,13.12891,44.7,114,13.39844,31,190,13.62109,45,72
13.89844,5.29,15.625,14.17188,34.9,89,14.39063,34.5,197,14.55859,47,76
13.89844,5.29,15.625,14.17188,34.9,89,14.39063,34.5,197,14.60938,47,76
14.78125,5.54,16.38281,15,38,97,15.26953,31,190,15.49219,48,78
14.78125,5.54,16.38281,15,38,97,15.26953,31,190,15.55078,48,78
15.76953,6.28,18.54688,16.03906,42,107,16.26172,27.5,183,16.48047,50,81
15.76953,6.28,18.54688,16.03906,42,107,16.26172,27.5,183,16.48047,50,81
16.75,6.25,18.45313,16.96875,52.2,133,17.25,27,182,17.41016,52,84
16.75,6.25,18.45313,16.96875,52.2,133,17.25,27,182,17.46875,52,84
17.74219,6.83,20.1875,17.96094,58,148,18.24219,27,182,18.46094,55,88
17.74219,6.83,20.1875,17.96094,58,148,18.24219,27,182,18.46094,55,88
18.73047,7.02,20.73047,19.01172,53.7,137,19.23047,27.5,183,19.44922,57,92
18.73047,7.02,20.73047,19.01172,53.7,137,19.23047,27.5,183,19.5,57,92
19.78125,7.23,21.36328,20.05078,53.3,136,20.26953,28.5,185,20.49219,60,96
19.78125,7.23,21.36328,20.05078,53.3,136,20.26953,28.5,185,20.53906,60,96
20.76172,7.23,21.36328,21.03906,53.7,137,21.37109,28.5,185,21.58984,61,99
20.76172,7.23,21.36328,21.03906,53.7,137,21.37109,28.5,185,21.64063,61,99
21.92188,7.08,20.91406,22.14063,43.1,110,22.41016,32.5,193,22.62891,64,103
21.92188,7.08,20.91406,22.14063,43.1,110,22.41016,32.5,193,22.69141,64,103
22.91016,5.01,14.78906,23.17969,35.3,90,23.39844,33,194,23.57031,65,104
22.91016,5.01,14.78906,23.17969,35.3,90,23.39844,33,194,23.62109,65,104
23.89844,4.74,14.01563,24.10938,34.5,88,24.39063,29.5,187,24.60938,65,105
23.89844,4.74,14.01563,24.10938,34.5,88,24.39063,29.5,187,24.60938,65,105
24.87891,4.84,14.29297,25.10156,35.3,90,25.37891,30.5,189,25.60156,66,107
24.87891,4.84,14.29297,25.10156,35.3,90,25.37891,30.5,189,25.64844,66,107
25.87109,3.98,11.75781,26.14844,28.6,73,26.37109,32.5,193,26.58984,66,107
25.87109,3.98,11.75781,26.14844,28.6,73,26.37109,32.5,193,26.58984,66,107
26.80859,2.76,8.167969,27.08203,25.1,64,27.30078,34,196,27.51953,66,107
26.80859,2.76,8.167969,27.08203,25.1,64,27.30078,34,196,27.51953,66,107
27.74219,2.56,7.578125,28.01172,22,56,28.23047,32.5,193,28.39844,66,107
27.74219,2.56,7.578125,28.01172,22,56,28.23047,32.5,193,28.44922,66,107
28.67188,2.06,6.078125,28.89063,19.2,49,29.10938,20,168,29.33203,66,107
28.67188,2.06,6.078125,28.89063,19.2,49,29.10938,20,168,29.33203,66,107
29.55078,1.33,3.925781,29.76953,19.2,49,29.99219,20,168,30.21094,66,106
29.55078,1.33,3.925781,29.76953,19.2,49,29.99219,20,168,30.21094,66,106
30.42969,.94,2.78125,30.64844,19.2,49,30.87109,20,168,31.03906,65,104
30.42969,.94,2.78125,30.64844,19.2,49,30.87109,20,168,31.08984,65,104
31.30859,.99,2.9375,31.53125,20.4,52,31.75,20,168,31.91016,64,103
31.30859,.99,2.9375,31.53125,20.4,52,31.75,20,168,31.96875,64,103
32.19141,1.36,4.003906,32.41016,23.5,60,32.62891,24.5,177,32.78906,63,102
32.19141,1.36,4.003906,32.41016,23.5,60,32.62891,24.5,177,32.85156,63,102
33.07031,2.42,7.144531,33.28906,25.9,66,33.55859,31.5,191,33.73047,63,101
33.07031,2.42,7.144531,33.28906,25.9,66,33.55859,31.5,191,33.78125,63,101
34,2.7,7.980469,34.21875,24.7,63,34.44141,32,192,34.66016,62,100
34,2.7,7.980469,34.21875,24.7,63,34.44141,32,192,34.71875,62,100
34.94141,3.22,9.511719,35.21094,29.4,75,35.42969,31,190,35.64844,62,100
34.94141,3.22,9.511719,35.21094,29.4,75,35.42969,31,190,35.64844,62,100
35.92188,2.98,8.800781,36.14063,25.5,65,36.35938,32.5,193,36.58203,62,100
35.92188,2.98,8.800781,36.14063,25.5,65,36.35938,32.5,193,36.64063,62,100
36.85938,2.06,6.078125,37.08203,19.2,49,37.30078,20,168,37.46094,62,100
36.85938,2.06,6.078125,37.08203,19.2,49,37.30078,20,168,37.51953,62,100
37.74219,1.19,3.527344,37.96094,19.2,49,38.17969,20,168,38.33984,61,99
37.74219,1.19,3.527344,37.96094,19.2,49,38.17969,20,168,38.39844,61,99
38.67188,.89,2.628906,38.89063,19.2,49,39.10938,20,168,39.26953,60,96
38.67188,.89,2.628906,38.89063,19.2,49,39.10938,20,168,39.33203,60,96
39.55078,.89,2.644531,39.76953,19.2,49,39.99219,20,168,40.14844,57,92
39.55078,.89,2.644531,39.76953,19.2,49,39.99219,20,168,40.21094,57,92
40.48047,.85,2.503906,40.69922,19.2,49,40.92188,20,168,41.14063,53,86
40.48047,.85,2.503906,40.69922,19.2,49,40.92188,20,168,41.14063,53,86
41.42188,.83,2.441406,41.58203,19.2,49,41.85938,20,168,42.01953,50,81
41.42188,.83,2.441406,41.58203,19.2,49,41.85938,20,168,42.08203,50,81
42.30078,.82,2.410156,42.51172,19.2,49,42.73047,20,168,42.89844,47,75
42.30078,.82,2.410156,42.51172,19.2,49,42.73047,20,168,42.94922,47,75
43.17188,.8,2.351563,43.39063,19.2,49,43.60938,20,168,43.83203,42,68
43.17188,.8,2.351563,43.39063,19.2,49,43.60938,20,168,43.83203,42,68
44.10938,.74,2.179688,44.33203,19.2,49,44.55078,20,168,44.76953,36,58
44.10938,.74,2.179688,44.33203,19.2,49,44.55078,20,168,44.76953,36,58
45.03906,.73,2.164063,45.26172,19.2,49,45.48047,20,168,45.64844,29,46
45.03906,.73,2.164063,45.26172,19.2,49,45.48047,20,168,45.69922,29,46
45.92188,.7,2.070313,46.14063,19.2,49,46.35938,20,168,46.58203,21,34
45.92188,.7,2.070313,46.14063,19.2,49,46.35938,20,168,46.58203,21,34
46.80078,.66,1.949219,47.01953,19.2,49,47.24219,20,168,47.46094,14,22
46.80078,.66,1.949219,47.01953,19.2,49,47.24219,20,168,47.46094,14,22
47.67969,.65,1.933594,47.94922,19.2,49,48.17188,20,168,48.33984,7,12
47.67969,.65,1.933594,47.94922,19.2,49,48.17188,20,168,48.39063,7,12
48.60938,.65,1.933594,48.83203,19.2,49,49.05078,20,168,49.21875,4,7
48.60938,.65,1.933594,48.83203,19.2,49,49.05078,20,168,49.26953,4,7
49.49219,.65,1.917969,49.71094,19.2,49,49.92969,22,172,50.08984,1,2
49.49219,.65,1.917969,49.71094,19.2,49,49.92969,22,172,50.14844,1,2
50.37109,.65,1.917969,50.58984,19.2,49,50.80859,22,172,50.96875,0,0
50.37109,.65,1.917969,50.58984,19.2,49,50.80859,22,172,51.03125,0,0
51.25,.66,1.949219,51.46875,19.2,49,51.69141,22,172,51.85156,0,0
51.25,.66,1.949219,51.46875,19.2,49,51.69141,22,172,51.91016,0,0
52.12891,.66,1.960938,52.35156,19.2,49,52.57031,22,172,52.73047,0,0
52.12891,.66,1.960938,52.35156,19.2,49,52.57031,22,172,52.78906,0,0
53.01172,.66,1.960938,53.23047,19.2,49,53.44922,22,172,53.71875,0,0
53.01172,.66,1.960938,53.23047,19.2,49,53.44922,22,172,53.76953,0,0
54.05078,.66,1.960938,54.37891,19.2,49,54.64844,22,172,54.92969,0,0
54.05078,.66,1.960938,54.37891,19.2,49,54.64844,22,172,54.92969,0,0
55.30859,.66,1.960938,55.75,19.2,49,56.03125,22,172,56.25,0,0
55.30859,.66,1.960938,55.75,19.2,49,56.03125,22,172,56.30078,0,0
56.51953,.66,1.949219,57.78125,19.2,49,58.17188,22,172,58.33203,0,0
56.51953,.66,1.949219,57.78125,19.2,49,58.17188,22,172,58.39063,0,0
58.71875,.66,1.949219,59.71094,19.2,49,59.92969,22,172,60.08984,0,0
58.71875,.66,1.949219,59.71094,19.2,49,59.92969,22,172,60.14844,0,0
60.37109,.81,2.378906,60.64063,19.2,49,60.85938,22,172,61.08203,0,0
60.37109,.81,2.378906,60.64063,19.2,49,60.85938,22,172,61.08203,0,0
61.30078,.83,2.457031,61.51953,19.2,49,61.74219,22,172,61.96094,0,0
61.30078,.83,2.457031,61.51953,19.2,49,61.74219,22,172,61.96094,0,0
62.17969,.83,2.441406,62.39844,19.2,49,62.62109,22,172,62.83984,0,0
62.17969,.83,2.441406,62.39844,19.2,49,62.62109,22,172,62.83984,0,0
63.10938,.81,2.394531,63.33203,19.2,49,63.55078,22,172,63.76953,0,0