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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > problems graphing cobb log



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      11-26-2012, 10:51 PM   #1
skatenc123
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problems graphing cobb log

well my car hasnt felt just right lately, so i tried to do some logs tonight. got 2 done from like 2500-6100 rpms. but im having problems getting it to graph. and i cant figure out how to upload the excel document on here. any help apreciated.
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      11-26-2012, 11:12 PM   #2
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Save the .CSV as a .txt and then attach it. Also, you can use VD: http://www.bradbarnhill.com/projects/VirtualDyno/ to graph it really easily
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      11-26-2012, 11:20 PM   #3
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maybe thi will work. still couldnt figure out the graph tho
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File Type: txt datalog1.txt (27.1 KB, 53 views)
File Type: txt datalog2.txt (32.1 KB, 35 views)
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      11-26-2012, 11:38 PM   #4
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You're having timing corrections across all six cylinders, sometimes 4 cylinders at a time. That will definitely explain the "off" feeling.

What map are you running? Stage 1+ aggressive?
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      11-26-2012, 11:44 PM   #5
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cobb stg2+ agg. im FBO. 93 oct. could this be gas station related?
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      11-27-2012, 12:02 AM   #6
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2008 BMW 335i  [3.75]
Try a different gas station. I try to stick to authorized Top Tier gas retailers (http://www.toptiergas.com/retailers.html)

My personal preference:
  1. Shell
  2. Exxon/Mobil
  3. Sunoco
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      11-27-2012, 12:13 AM   #7
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thats with marathon gas. ill try shell tomorrow and do some logs.
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      11-27-2012, 12:15 AM   #8
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Quote:
Originally Posted by skatenc123 View Post
cobb stg2+ agg. im FBO. 93 oct. could this be gas station related?
It definitely could be. That would be an easy thing to test/fix.
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      11-27-2012, 01:52 AM   #9
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put in 11 gallons 93 at exxon here are 2 more logs in 3rd and shift to 4th
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File Type: txt newgas2.txt (23.8 KB, 37 views)
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      11-27-2012, 11:51 AM   #10
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put in 11 gallons 93 at exxon here are 2 more logs in 3rd and shift to 4th
Yep, that cleaned up the timing corrections very nicely.
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