PLX devices digital input - Kpro III

[jbaker]

I am using PLX devices for wideband, oil pressure, oil temp, and boost/vac. I am using the digital inputs and have successfully datalogged with the wideband and oil temp. The wideband reading was a little inaccurate on the Kpro III and tended to fluctuate a little bit when compared to the DM-6 gauge. The oil temp reading in Kpro III was accurate.

My question is...does the Kpro III currently support oil pressure from PLX devices? I do not see it listed in the current KManager 3.1.6.0. I tried it with fuel pressure and that did not work...read about 2348 psi.

Thanks in advance!

[Spunkster]

Currently it does not, but we may be able to add it for a future release.

The reason you may see more fluctuation datalogging in our software than you see on the guage is that the guage may not refresh as frequently.

[jbaker]

Hopefully not too late in the future for the oil pressure input but thanks for confirming.

The fluctuations with the wideband make it complicated to review the datalogs even at steady driving 65mph...I see fluctuations reading 12-20 that last for about 2-3 seconds then return to normal. The fluctuations are persistent and happen about every 10-15 seconds.

I can load the datalogs for review if that is of any interest - I am in the beginning stages of street tuning and slowly adding boost for driving comfort then will dyno it once I'm comfortable with the power ~ 2weeks.

[Hondata]

Can you give us a rough conversion between the PLX gauge and KPro (with the settings as fuel pressure)?
eg gauge 30 psi, KPro 1000 psi, gauge 100 psi, KPro 2000 psi etc
This will help us check the conversion calculation.

[jbaker]

I'll have a rough conversion before the weekend. I should have time to get the data tomorrow.

[sass]

jbaker
Can You show your scheme of connection for digital unit?

[jbaker]

Can you give us a rough conversion between the PLX gauge and KPro (with the settings as fuel pressure)?
eg gauge 30 psi, KPro 1000 psi, gauge 100 psi, KPro 2000 psi etc
This will help us check the conversion calculation.

The following are the oil pressure readings [psi] from the PLX DM-6 and KPro III (added as PLX fuel sensor):
Data - gathered
25.0 - 1856.5
25.4 - 1885.0
71.9 - 5337.0
73.9 - 5482.4
Data - gathered
low idle
11.9 - 884
13.4 - 1015.8

Interpolated values
12 - 892.79
13 - 980.65
13.4 - 1015.80
14 - 1059.28
15 - 1131.76
16 - 1204.23
17 - 1276.71
18 - 1349.18
19 - 1421.66
20 - 1494.13
21 - 1566.60
22 - 1639.08
23 - 1711.55
24 - 1784.03
25 - 1856.50
26 - 1929.54
27 - 2003.78
28 - 2078.02
29 - 2152.25
30 - 2226.49
31 - 2300.72
32 - 2374.96
33 - 2449.20
34 - 2523.43
35 - 2597.67
36 - 2671.91
37 - 2746.14
38 - 2820.38
39 - 2894.62
40 - 2968.85
41 - 3043.09
42 - 3117.33
43 - 3191.56
44 - 3265.80
45 - 3340.04
46 - 3414.27
47 - 3488.51
48 - 3562.75
49 - 3636.98
50 - 3711.22
51 - 3785.46
52 - 3859.69
53 - 3933.93
54 - 4008.17
55 - 4082.40
56 - 4156.64
57 - 4230.88
58 - 4305.11
59 - 4379.35
60 - 4453.58
61 - 4527.82
62 - 4602.06
63 - 4676.29
64 - 4750.53
65 - 4824.77
66 - 4899.00
67 - 4973.24
68 - 5047.48
69 - 5121.71
70 - 5195.95
71 - 5270.19
71.9 - 5337.00
72 - 5344.27
73 - 5416.97
73.9 -5482.40

Conversion e.g. Krpo fuel press/DM-6 oil press
12 0.01344
13 0.01326
13.4 0.01319
14 0.01322
15 0.01325
16 0.01329
17 0.01332
18 0.01334
19 0.01336
20 0.01339
21 0.01340
22 0.01342
23 0.01344
24 0.01345
25 0.01347
26 0.01347
27 0.01347
28 0.01347
29 0.01347
30 0.01347
31 0.01347
32 0.01347
33 0.01347
34 0.01347
35 0.01347
36 0.01347
37 0.01347
38 0.01347
39 0.01347
40 0.01347
41 0.01347
42 0.01347
43 0.01347
44 0.01347
45 0.01347
46 0.01347
47 0.01347
48 0.01347
49 0.01347
50 0.01347
51 0.01347
52 0.01347
53 0.01347
54 0.01347
55 0.01347
56 0.01347
57 0.01347
58 0.01347
59 0.01347
60 0.01347
61 0.01347
62 0.01347
63 0.01347
64 0.01347
65 0.01347
66 0.01347
67 0.01347
68 0.01347
69 0.01347
70 0.01347
71 0.01347
71.9 0.01347
72 0.01347
73 0.01348
73.9 0.01348

Average value for conversion (conversion*Kpro fuel press = DM-6 oil press)
0.01344


I tried to upload a spreadsheet but the forum does not allow that file extension. Of course the conversion would be more precise if I could take more data points so the uncertainty is off by ~0.5 psi.

[jbaker]

jbaker
Can You show your scheme of connection for digital unit?

I made a male 3.5mm jack and connected signal (yellow wire) and ground (black) to the 4 pin connector on the Hondata digital input:



Here you can see where I connected the 4 pin connector. I connected the black wire to ground and yellow to I+



It's all connected complete with a strain relief that you cannot see.



On the PLX module (wideband), I have the Tx (transmit) split with 2 female 3.5 mm. I connected one to the DM-6 gauge (it is male 3.5mm) and the other to the male 3.5mm male that I just fabricated and installed on the Kpro III. The remaining PLX modules are daisy-chained - no brainer with those.

I hope this answers your question. I added another fuse panel using a 10AWG (or 12AWG? I forget) to power the bus for 30amps. I then added 5amp fuses and ran the power wires from the bus to the PLX modules in parallel (18AWG wires for PLX modules). The rest is all aesthetics...raychem, flex loom, molex connectors, etc.

[sass]

jbaker
Can You show your scheme of connection for digital unit?

I made a male 3.5mm jack and connected signal (yellow wire) and ground (black) to the 4 pin connector on the Hondata digital input:



Here you can see where I connected the 4 pin connector. I connected the black wire to ground and yellow to I+



It's all connected complete with a strain relief that you cannot see.


On the PLX module (wideband), I have the Tx (transmit) split with 2 female 3.5 mm. I connected one to the DM-6 gauge (it is male 3.5mm) and the other to the male 3.5mm male that I just fabricated and installed on the Kpro III. The remaining PLX modules are daisy-chained - no brainer with those.

I hope this answers your question. I added another fuse panel using a 10AWG (or 12AWG? I forget) to power the bus for 30amps. I then added 5amp fuses and ran the power wires from the bus to the PLX modules in parallel (18AWG wires for PLX modules). The rest is all aesthetics...raychem, flex loom, molex connectors, etc.

Thank you very much

[Hondata]

Looks like it is in bar (PLX does not mention what the raw units are). Conversion factor should be 74.22. We'll update the software for the next release.

[jbaker]

Looks like it is in bar (PLX does not mention what the raw units are). Conversion factor should be 74.22. We'll update the software for the next release.

If you invert my average conversion number then that is what you get so I agree. I chose to a ratio of DM-6/Kpro, you chose Kpro/DM-6...either way the same.

1/0.01344 = 74.4