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Data Logger now available

 
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  #1 (permalink)  
Old 17 Dec 2004, 01:15 pm
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Join Date: Apr 2003
Location: Brunswick, Georgia, USA.
Posts: 518
Default Data Logger now available

I did a search, and didn't find any previous mention of this; apologies if it has been covered before.

I took the plunge and got a Davis Instruments CarChipEX data logger. They are available from AutoZone in my area.

It will log up to 300 hours of trip details and lets you select 4 out of 23 possible engine parameters to record every 5 to 60 seconds (software selectable).

The software has a number of plotting options, and there is a SDK (Software Development Kit) available for download from thie customer suport page that has include and library files for both "C" and Visual Basic..

I just got it, and will be travelling 300 miles over the weekend, I hope to have some info to share when I get back.

I plan on logging Speed, throttle position, intake manifold pressure, Engine RPM and Engine Load.

Hopefully, this will provide some interesting info.

It will also allow me to see if there are any changes in how the PCM controls the system after a system reset (removing battery cable and clearing "learned" data.

This should show once and for all if the PCM does start limiting performance as it gathers more detail anout the driver's style. I have become less agressive in my driving in the months after first getting Stage I, and the performance seems to have dropped.


Here is the info from their site:


CarChipE/X includes all the features of CarChip, plus four times the data storageĀ—up to 300 hours of driving data. (The actual number of hours will vary, depending on how frequently you log data.)

As with CarChip, you'll get time and date for each trip, distance, speed, hard accelerations and decelerations, and engine diagnostic trouble codes.

With CarChipE/X, though, you'll also be able to monitor any four out of 23 user-selectable engine parameters, including:


RPM
Throttle position
Engine load
Fuel pressure
Fuel system status
Short- and long-term-fuel trim
Battery voltage
Timing advance
Coolant temperature
Air flow rate
Intake air temperature
Intake manifold pressure
Oxygen sensor voltage

Plus, if you're unfortunate enough to be involved in an accident, CarChipE/X will automatically generate an accident log showing the last critical 20 seconds of speed.

Includes data logger, software on CD, download cable, and power adapter. Requires Windows 95 or above, at least 5 MB free hard disk space, and one free serial port. Add our optional USB-to-Serial Cable to connect to USB.

http://www.davisnet.com/drive/produc....asp?pnum=8220
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  #2 (permalink)  
Old 17 Dec 2004, 09:03 pm
Cool Cruiser
 
Join Date: Oct 2004
Location: El Cajon, CA, USA.
Posts: 485
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Hey, if you haven't left yet, here are a couple suggestions;
1. check injector pulse width coasting downhill in gear (throttle off) and then with the clutch in or in neutral. Might see one a bit lower than the other for all the guys who want more mileage.
2. Engine load difference with A/C on/off at steady cruise.
3. Engine load difference with window(s) up/down.
4. boost curves in each gear
5. maybe try regular fuel and drive easy, while checking knock sensor status
6. This one may shock, but with cruise on, try a freeway section with curves and check load. You may see how good the alignment is...
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2004 Dark Plum Base with windows tinted, cabin filter, silencers removed, fog lights, 18\'s, all Red taillights, Blaine\'s struts, modesty cover, color-matched center dash, 06 rear bumper
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  #3 (permalink)  
Old 31 Dec 2004, 08:32 pm
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Dalite,
Were you able to log the info from your trip? Did you check timing advance under Part & WOT? Let us know,
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Old 01 Jan 2005, 06:52 pm
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Location: San Juan, Puerto Rico, USA.
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Dalite,

Remember to post your findings. I want to buy one of those but want to make sure it is compatible.

Ian
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  #5 (permalink)  
Old 05 Jan 2005, 12:22 pm
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Location: Brunswick, Georgia, USA.
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Here is some rough data, using parameters I has set initially. I don't know if this will be any help. The Intake manifold pressures are suspect. I don't know if they are absolute, measured pressure minus barometric, etc.

This is a long post, for a 27 mile segment of the trip.

I will try to answer any questions, or try other parameter selections.


View / Trip Log / Trip 57 / Table


First Column: 5 second interval number
Second Column: Elapsed Time
Third Column: Speed (MPH)
Fourth Column: Engine Speed (RPM)
Fifth Column: Throttle Position %
Sixth Column Engine Load %
Seventh Column: Intake manifold Pressure (PSI)

1 0:00:00 1 1,598 16.86 18.04 3.9
2 0:00:04 2 965 17.25 30.98 6.8
3 0:00:09 6 733 15.29 35.29 5.8
4 0:00:14 6 1,701 20.39 36.08 9.4
5 0:00:19 12 811 15.29 28.63 5.2
6 0:00:24 7 777 24.71 45.88 10.7
7 0:00:29 9 2,926 35.29 40.39 10.0
8 0:00:34 23 3,564 74.90 100.00 26.8
9 0:00:39 47 3,293 24.71 24.71 7.4
10 0:00:44 49 3,270 25.49 25.88 7.7
11 0:00:49 50 3,367 24.31 23.14 7.0
12 0:00:54 50 3,326 21.96 21.18 6.5
13 0:00:59 50 3,317 22.75 21.57 6.7
14 0:01:04 50 3,310 23.14 22.35 6.8
15 0:01:09 50 3,313 22.75 21.57 6.7
16 0:01:14 49 3,270 20.00 18.43 5.7
17 0:01:19 48 3,175 20.00 19.22 5.8
18 0:01:24 47 3,106 20.00 19.22 5.8
19 0:01:29 46 3,118 22.75 22.35 7.1
20 0:01:34 47 3,164 22.35 21.18 6.8
21 0:01:39 47 3,173 21.18 20.00 6.5
22 0:01:44 47 3,175 21.57 20.00 6.5
23 0:01:49 48 3,207 24.71 23.92 7.4
24 0:01:53 48 3,245 22.35 21.18 6.8
25 0:01:58 49 3,281 22.35 20.78 6.7
26 0:02:03 49 3,317 22.35 20.78 6.7
27 0:02:08 50 3,344 22.35 20.00 6.5
28 0:02:13 50 3,351 22.35 20.39 6.5
29 0:02:18 50 3,351 22.35 20.00 6.4
30 0:02:23 50 3,354 22.35 20.00 6.4
31 0:02:28 50 3,372 22.35 20.39 6.4
32 0:02:33 50 3,391 21.96 20.78 6.2
33 0:02:38 50 3,337 20.00 18.04 5.7
34 0:02:43 50 3,334 21.57 20.78 6.4
35 0:02:48 50 3,331 21.96 21.18 6.4
36 0:02:53 50 3,327 21.96 21.18 6.4
37 0:02:58 50 3,269 19.61 16.47 5.4
38 0:03:03 48 3,177 20.39 19.22 5.9
39 0:03:08 47 3,159 20.78 21.57 6.5
40 0:03:13 47 3,174 21.18 21.57 6.5
41 0:03:18 48 3,202 21.18 21.57 6.4
42 0:03:23 48 3,202 21.57 22.35 6.7
43 0:03:28 48 3,229 21.96 21.96 6.7
44 0:03:33 48 3,301 23.92 22.35 7.1
45 0:03:38 50 3,388 23.92 21.96 7.0
46 0:03:43 51 3,454 24.71 22.35 6.8
47 0:03:47 52 3,525 23.92 20.78 6.4
48 0:03:52 53 3,549 26.27 24.31 7.5
49 0:03:57 55 3,659 15.29 10.59 4.1
50 0:04:02 60 2,438 30.98 46.67 12.6
51 0:04:07 62 2,519 20.78 27.45 7.7
52 0:04:12 62 2,477 22.35 30.98 8.6
53 0:04:17 61 2,477 22.35 30.98 8.6
54 0:04:22 62 2,509 22.35 30.98 8.6
55 0:04:27 63 2,511 22.35 30.98 8.6
56 0:04:32 63 2,518 22.35 30.98 8.6
57 0:04:37 62 2,504 22.75 30.98 8.6
58 0:04:42 62 2,500 22.75 31.37 8.7
59 0:04:47 62 2,496 22.75 31.37 8.7
60 0:04:52 62 2,494 22.75 31.76 8.7
61 0:04:57 62 2,505 22.75 31.37 8.6
62 0:05:02 62 2,502 22.75 31.37 8.7
63 0:05:07 62 2,506 22.75 31.37 8.6
64 0:05:12 62 2,504 22.75 31.37 8.6
65 0:05:17 62 2,497 22.75 31.37 8.6
66 0:05:22 62 2,513 22.75 31.37 8.6
67 0:05:27 62 2,503 21.57 29.41 8.1
68 0:05:32 62 2,494 22.35 30.59 8.4
69 0:05:37 62 2,481 18.82 21.96 5.7
70 0:05:41 60 2,407 20.39 26.67 7.4
71 0:05:46 60 2,388 20.78 27.45 7.5
72 0:05:51 60 2,403 25.10 36.08 9.9
73 0:05:56 60 2,447 24.31 34.51 9.4
74 0:06:01 61 2,484 23.92 33.73 9.3
75 0:06:06 62 2,475 21.18 28.63 8.0
76 0:06:11 61 2,451 21.96 30.20 8.3
77 0:06:16 61 2,442 21.96 30.20 8.3
78 0:06:21 60 2,437 21.96 29.80 8.3
79 0:06:26 60 2,427 20.00 23.92 6.7
80 0:06:31 60 2,385 20.78 27.45 7.5
81 0:06:36 59 2,379 20.78 28.24 7.8
82 0:06:41 59 2,372 20.78 28.24 7.8
83 0:06:46 58 2,363 20.78 28.24 7.8
84 0:06:51 58 2,374 21.96 30.20 8.4
85 0:06:56 59 2,378 21.96 30.59 8.4
86 0:07:01 59 2,392 22.35 30.98 8.4
87 0:07:06 60 2,408 22.35 30.59 8.4
88 0:07:11 60 2,424 22.35 30.59 8.4
89 0:07:16 60 2,425 22.35 30.98 8.4
90 0:07:21 60 2,472 25.49 36.47 9.9
91 0:07:26 62 2,532 25.49 35.69 9.9
92 0:07:31 63 2,572 24.71 33.33 9.4
93 0:07:35 64 2,596 24.71 32.55
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  #6 (permalink)  
Old 05 Jan 2005, 12:31 pm
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Location: Brunswick, Georgia, USA.
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Quote:
quote:Originally posted by purple04

Hey, if you haven't left yet, here are a couple suggestions;
1. check injector pulse width coasting downhill in gear (throttle off) and then with the clutch in or in neutral. Might see one a bit lower than the other for all the guys who want more mileage.
2. Engine load difference with A/C on/off at steady cruise.
3. Engine load difference with window(s) up/down.
4. boost curves in each gear
5. maybe try regular fuel and drive easy, while checking knock sensor status
6. This one may shock, but with cruise on, try a freeway section with curves and check load. You may see how good the alignment is...
OK, sorry for the late response.

1. Speculation here, as I cannot yet provide that type of measurement. The chip will only measure the parameters in the original post. I have felt deceleration when coasting down inclines in my 5 speed, and have often wondered if the PCM was sending data to the ABS controllers to keep all wheels turning the same RPM; which keeps the seed very close to that measured when you start to coast. Again, this is speculation, based on what I have felt.

2. - 6. These are very good suggestions, but I don't see that this data logger will allow me to measure that information.

The Software Development kit may allow someone to put together a program that will run in real time, and allow a passenger to enter comments to measured events, but at present, all that I can provide is data similar to that in the previous response.
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Old 05 Jan 2005, 12:43 pm
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Quote:
quote:Originally posted by Ian-PT-GT

Dalite,

Remember to post your findings. I want to buy one of those but want to make sure it is compatible.

Ian
Ian, the CarChip EX seems to be compatible with the basic OBDII data set, but I don't think it can actually "see" the extended data set that is used in the NGC PCM used in the GT.

The 13 parameters I listed earlier, along with 10 extra associated with O2 sensors - (upstream, downstream, single manifold, dual manifold. etc) are all that it can monitor.

This is about all I see that it will do, as shipped. The firmware is upgradeable, and I have already updated mine (in the carchip) to the latest version.

Only 7 pins on the Diagnostic connector are monitored by the CarChip.

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Old 05 Jan 2005, 10:10 pm
Cool Cruiser
 
Join Date: Oct 2004
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Posts: 485
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The engine load and air flow rate will cover some of those. Driving at a steady state (cruise control?) and turning on/off A/C and up/down with the windows on a straight stretch should measure changes. RE the DLC 7 pins, the data stream from the Local Area Network (LAN) is only 2 wires, add B+ and ground=4 wires. Haven't looked at what is on the others recently, but I'll let you know tomorrow from work. I may also be able to find out how fast the data is 'streamed', so you can compare against the report rate of the data logger.

Quote{have felt deceleration when coasting down inclines in my 5 speed, and have often wondered if the PCM was sending data to the ABS controllers to keep all wheels turning the same RPM; which keeps the seed very close to that measured when you start to coast. Again, this is speculation, based on what I have felt.} end quote.

The ABS reports wheel speed, but I doubt the vehicle "maintains speed" while coasting. Most manufacturers use decel (high vacuum, low MAP) to cut fuel delivery, helping MPG averages and emissions. I just wondered if the fuel trim would show A. true zero, B. a slight amount of fuel(less than idle) or C. about the same as idle, to keep the engine smooth and feed the cat enough to keep hot.
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Old 06 Jan 2005, 05:43 pm
Cool Cruiser
 
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Location: El Cajon, CA, USA.
Posts: 485
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Okay, as promised, the DLC connector terminals (only 8 used)
1 empty
2 PCI bus
3 empty
4 ground
5 ground
6 empty
7 SCI transmit (PCM)
8 empty
9 Flash program enable (and SCI Recieve TCM)
10 empty
11 empty
12 SCI Recieve (PCM)
13 empty
14 empty
15 SCI transmit (TCM)
16 fused B+

The communications are on the 2-wire SCI bus (not LAN)and single-wire PCI bus. Couldn't find transimt speed, but it's in milliseconds, not 5 second intervals, so you won't see "live" data.
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Old 09 Jan 2005, 11:50 am
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Great Info!!!!

From both of you, Dalite and Purple [?]

I am again interested in the PCM of my PT.

From what I can see in the readings, The car never went to full throttle or the logger was set two slow as purple pointed out. The highest I saw was almost 75%.

I am sure that the MAP info is absolute not corrected. that 16 means 12.2 PSI at a 75% throttle but the 100% load tells me that you went on full acceleration but the logger reccorded when you where starting to let go of the trottle.

Time to build some charts with the raw data and see what we get.

Off to Exccel I go.

I must buy one of those!!!!


Ian
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