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      01-31-2013, 01:05 AM   #1
Jonjt
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Cobb Stage 1 Sport just installed. Help with data logs

Hi everyone,
I just installed the Cobb stage 1 sport map on my car. Went out for a drive, just to make sure car ran fine. I enabled data logging but, didn't perform a proper 3rd gear pull. However, some of the values I logged bother me. I will do a proper run but, I want you guys to take a look at my data, just to make sure everything is ok. I don't want to go do a WOT pull and damage something.

The graphs are attached. A few things I noticed.

~20 PSI boost spikes. I have not seen such high boost spikes on anyone's timing graphs. Is this something unexpected, considering that I logged during normal driving, instead of a staged pull?

At times, there is a huge discrepancy between the requested load and actual load. Any insights?

Timing corrections, I assume they are in degrees? It looks like the DME is pulling a few degrees of timing at WOT. Is that more so than expected?

Cylinder 1 timing is all over the place. What's with the severely retarded timings? Anything less than 0 implies spark after TDC. Engine braking, perhaps?


The car FEELS good and there are no codes. What do you guys think? Should I just go out and do a proper 3rd gear pull now and, not worry about the weird data here?

Thanks
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      01-31-2013, 01:08 AM   #2
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Holy scaling fail batman.

Rescale a WOT pull in 3rd gear from 3000 RPM to redline with a shift into 4th and repost.
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      01-31-2013, 01:38 AM   #3
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what in the actual fuck
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      01-31-2013, 10:00 AM   #4
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Obviously the scale is totally off there, but regardles, a datalog is generally only useful if it's a WOT pull from about 2.5K to at least 6K revs. Just cruising around you'll see timing corrections, which is totally normal.
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      01-31-2013, 10:06 AM   #5
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Some people say there are lies, damn lies, and statistics, but with data scaled and formatted this way, it's just a straight up fail.
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      01-31-2013, 10:20 AM   #6
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lol
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      01-31-2013, 10:47 AM   #7
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22,756sec of data... very thorough, catching every possible driving scenario.
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      01-31-2013, 04:54 PM   #8
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Quote:
Originally Posted by themyst View Post
Holy scaling fail batman.

Rescale a WOT pull in 3rd gear from 3000 RPM to redline with a shift into 4th and repost.
Meh, only two data sets were scaled.

The idea here was to see if it's safe to even do a 3rd gear WOT run, considering the 20PSI boost spikes.
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      01-31-2013, 05:03 PM   #9
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Quote:
Originally Posted by Jonjt View Post
Meh, only two data sets were scaled.

The idea here was to see if it's safe to even do a 3rd gear WOT run, considering the 20PSI boost spikes.
You're fine.
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      01-31-2013, 06:23 PM   #10
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boost spikes are perfectly normal on gear change. Just do a 3rd-4th gear WOT and datalog it with the std parameters. attach the file renamed as txt if you dont know how to plot it.
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      01-31-2013, 10:45 PM   #11
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WOT means what...
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      01-31-2013, 10:46 PM   #12
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WOT means what...
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      01-31-2013, 11:19 PM   #13
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wide open throttle
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      02-01-2013, 12:13 AM   #14
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Do a proper 3rd gear pull. And make sure to disable traction control so you don't get throttle closure. Also, let us know what fuel you are running.
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      02-06-2013, 11:27 PM   #15
Jonjt
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I've been traveling so, I finally got the chance to do a 3rd gear pull, yesterday. I'm not sure what values you need to look at so, I've attached the csv file, renamed with a .txt extension.

The car had Sunoco 93 with 10% ethanol blend in it when these logs were taken.

Thanks.
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File Type: txt datalog2.txt (29.2 KB, 31 views)
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      02-06-2013, 11:46 PM   #16
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Quote:
Originally Posted by Jonjt View Post
I've been traveling so, I finally got the chance to do a 3rd gear pull, yesterday. I'm not sure what values you need to look at so, I've attached the csv file, renamed with a .txt extension.

The car had Sunoco 93 with 10% ethanol blend in it when these logs were taken.

Thanks.
Reset your datalog list to the default channels. That will really give a lot better picture of what's going on.

With that said, the timing corrections and the important stuff(what's there atleast) looks ok.
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      02-07-2013, 07:19 AM   #17
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Quote:
Originally Posted by Ænema View Post
Reset your datalog list to the default channels. That will really give a lot better picture of what's going on.

With that said, the timing corrections and the important stuff(what's there atleast) looks ok.
Alright. will do, thank you.
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