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Old 02-19-2006, 08:40 PM   #1
dexterous
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Default Now that I can data log my STI what should I capture?

I got my AccessPort a few days ago and decided to try some data logging. Since the AP cable will work with the TARI Racing Software ecuExplorer I figured that this would be a great match. I Have everything up and running and the logging is working perfectly. The greatest part is that the logging is toggled by hitting the rear defrost button.

I guess my first question is slightly embarrassing, what should I log? For my test logging I decided to log the following:

Engine Speed (RPM)
Throttle Opening Angle (%)
Manifold Absolute Pressure (PSI)
Air/Fuel Sensor #1 (Lambda)
Fuel Pump Duty (%)
Intake Air Temperature (-F)
Vehicle Speed (KPH)
Knock Correction (?BTDC)
Knock Signal #1 (On/Off)

My main goal is to check the tune (Currently PDX Stage 2 OTS map) for safety. Can anybody recommend a better data set to log?

How should I go about analyzing my logs? Again, safety is my biggest concern.

On the Knock Signal #1, would I see this value increase to 1 if knock was detected? How accurate is this?

Is there any way to monitor AFR in this log? I know I would need something like the TurboXS Tuner or something similar to read AFR accurately but how do I get this data into my data log?

Finally, would logging EGTs provide me with any useful data? Like the AFR question, how do I get this into my data log?
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Last edited by dexterous; 02-19-2006 at 08:57 PM.
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Old 02-19-2006, 10:18 PM   #2
crystalhelix
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RPM, MAP, A/F, Knock Signal #1

from what's on your list that's all I see that's truly important for tuning. The stock A/F sucks ballz and has a very narrow band, but if you see "rich" or "lean" you know your not in the ball park as when ever it's off the scale on the UTEC is says one those (unless you have the Tuner column)

Can't you take any timing or boost logging?

I would look for RPM, boost, ignition, A/F, IDC, knock and your EGT's

For a stage 2 map I want to make sure the boost and A/F are right because timing is usualy conservative.

J
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Old 02-19-2006, 10:42 PM   #3
salt
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Default Ait

Even though its winter, I would like to know my air intake temp at all times. It would be great to compare them with summer temps.
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Old 02-19-2006, 11:21 PM   #4
dexterous
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Watching the intake temp is amazing! The temp outside was 22F and I was seeing ~150F intake temps while sitting at a stop light. 1/8 of a mile away and I was seeing ~40F!
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Old 02-19-2006, 11:24 PM   #5
dexterous
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Quote:
Originally Posted by crystalhelix
RPM, MAP, A/F, Knock Signal #1

from what's on your list that's all I see that's truly important for tuning. The stock A/F sucks ballz and has a very narrow band, but if you see "rich" or "lean" you know your not in the ball park as when ever it's off the scale on the UTEC is says one those (unless you have the Tuner column)

Can't you take any timing or boost logging?

I would look for RPM, boost, ignition, A/F, IDC, knock and your EGT's

For a stage 2 map I want to make sure the boost and A/F are right because timing is usualy conservative.

J

It looks like I can log everything but EGTs. I thought there was a EGT probe on the 05 STI. Anybody have any info on this?
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Old 02-20-2006, 12:28 AM   #6
crystalhelix
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Quote:
Originally Posted by dexterous
It looks like I can log everything but EGTs. I thought there was a EGT probe on the 05 STI. Anybody have any info on this?
Nope, only the WRX, IIRC, hence the different up-pipe.
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Old 02-20-2006, 12:33 AM   #7
richde
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how about.....

RPM
Mass Air Flow
Injector Duty Cycle
Intake Air Temp
Timing
Knock Correction
Relative Pressure (boost)
Wastegate Duty Cycle
IAM
Rear O2
Knock Signal #1
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Old 02-20-2006, 01:20 PM   #8
dexterous
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why the rear o2?
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Old 02-20-2006, 01:24 PM   #9
crystalhelix
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Quote:
Originally Posted by dexterous
why the rear o2?
Because you don't want anything happening in your rear that you don't know about.....I know, that was gross.

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Old 02-21-2006, 08:44 AM   #10
ride5000
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Quote:
Originally Posted by dexterous
Watching the intake temp is amazing! The temp outside was 22F and I was seeing ~150F intake temps while sitting at a stop light. 1/8 of a mile away and I was seeing ~40F!
what intake are you running?
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Old 02-21-2006, 04:52 PM   #11
JRSCCivic98
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Default

Quote:
Originally Posted by richde
how about.....

RPM
Mass Air Flow
Injector Duty Cycle
Intake Air Temp
Timing
Knock Correction
Relative Pressure (boost)
Wastegate Duty Cycle
IAM
Rear O2
Knock Signal #1
What he said, but forget the rear O2... get the front/primary O2 sensor A/F ratio (not that it matters that much in open loop since it's not absolutely acurate). Also, forget the Knock Signal... the sensor sets off way quicker then the software will pick up the change... look at your IAM and KC values to determine if you're knocking. Low IAM and negative KC values are bad. Be aware that you'll probably see -2 KC values from time to time as you transition from off the gas to on the gas... this is normal. I seriously doubt you'll see any negative things on those maps though... I've seen some logs from WRX guys running the PDX remaps and they are running great. They tune a lot better then Cobb does for OTS maps. Oh yeah... and you can check out your fuel trims as well if you want. Good luck.
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Old 02-21-2006, 10:08 PM   #12
dexterous
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Thanks for the response. The car did have one noticeable knock event today while I was driving it. For some reason I did not have the log running when it happened but I could feel it and I looked at the screen and saw the counter going up. I think this happened around 5500RPM but I am not 100% sure. After this the car seemed to be slightly slower for the rest of the drive. Would the ECU have retarded the timing after this?
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Old 02-21-2006, 11:06 PM   #13
crystalhelix
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Quote:
Originally Posted by dexterous
Thanks for the response. The car did have one noticeable knock event today while I was driving it. For some reason I did not have the log running when it happened but I could feel it and I looked at the screen and saw the counter going up. I think this happened around 5500RPM but I am not 100% sure. After this the car seemed to be slightly slower for the rest of the drive. Would the ECU have retarded the timing after this?
your IAM drops so timing is pulled

5500 is where I had some issues as well. were you doing a hard pull? it may be fuel pump time unless you did one already.

Justin
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Old 02-21-2006, 11:21 PM   #14
kinada423
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So whats the final word on what exactly someone would want to critique when viewing a datalog for safety/performance. I'll be redoing my datalog for my PDX map soon for a post I started last week sometime soon and wanted to be sure to log the most useful information.
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Old 02-22-2006, 08:21 AM   #15
ride5000
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Quote:
Originally Posted by ride5000
what intake are you running?
bump for answer?
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Old 02-22-2006, 08:43 AM   #16
crystalhelix
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Quote:
Originally Posted by crystalhelix
RPM, MAP, A/F, Knock Signal #1

from what's on your list that's all I see that's truly important for tuning. The stock A/F sucks ballz and has a very narrow band, but if you see "rich" or "lean" you know your not in the ball park as when ever it's off the scale on the UTEC is says one those (unless you have the Tuner column)

Can't you take any timing or boost logging?

I would look for RPM, boost, ignition, A/F, IDC, knock and your EGT's

For a stage 2 map I want to make sure the boost and A/F are right because timing is usualy conservative.

J
It's all personal preference on what you like to "see" vs. what is important for tuning.
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Old 02-23-2006, 11:00 AM   #17
nhluhr
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Why are people recommending to log the Knock Signal #1? It is a completely useless logging parameter since it's a digital-only parameter (meaning on/off) but knock is anything but digital. The ECU doesn't use the knock sensor digitally. You could be logging the Knock Signal all day long and never see it register a knock event (because it will only log a 1 instead of 0 if the knock is happening at the exact instant the log data is polled). The better thing to log is the Knock Correction or perhaps the Dynamic Advance.
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Old 02-23-2006, 11:28 AM   #18
crystalhelix
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nhluhr - thanks for posting, can you answer me this?

I have a tuner pro with the knock sensor with det cans so I can listen on headphones. What should you be listening for. Honestly, I think I am hearing the injectors, but I am wondering if knock is a "more apparent" sound if your actually listening.

Justin
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Old 02-23-2006, 12:00 PM   #19
ride5000
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knock, ime, sounds like a pop or crack, usually singular in number and followed immediately by my utec flashing the cel in my face. it's less of a click and a bit more percussive in nature than the valvetrain/injector background noise.
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Old 02-23-2006, 01:15 PM   #20
JRSCCivic98
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Is this the normal setup when you have det cans on the car?

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