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Old 03-06-2013, 01:29 AM   #1
NoUse66
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Default Cobb Stage 2 OTS datalog

I just went to stage 2 (OTS Cobb map) and could use some help interpreting my first datalog (3rd gear pull):

https://docs.google.com/spreadsheet/...Gc&usp=sharing

Is that amount of fine knock learn something to worry about? Does anything else stand out?

My setup is a catted Invidia downpipe, stock midpipe, and a Stromung axelback.

Thanks in advance!
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Old 03-06-2013, 04:43 AM   #2
jebjkey
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That amount of FKL is not really a big deal. Keep an eye on it though to see if it continues to go more negative. I do not know how much you have driven around since you flashed the map. If you -just- flashed the map and went out and got the datalog then I would be worried with how fast it threw in some FKL. If you have been driving with the map a tank of gas or more, then I would not worry right now, but I would keep an eye on it to see what it does.

Are you running the ACN91 map? If not, flash the ACN91 map.

Your peak boost is a little low compared to the 17# target. You have a small boost oscillation between 3000 and 3600 (~1#) not that big of a deal. I would try the ACN91 HWG map and see how your boost looks using that map. The oscillation might spike more, but it is worth seeing how it works on your car.
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Old 03-06-2013, 10:31 AM   #3
Cobb Tuning
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Quote:
Originally Posted by NoUse66 View Post
I just went to stage 2 (OTS Cobb map) and could use some help interpreting my first datalog (3rd gear pull):

https://docs.google.com/spreadsheet/...Gc&usp=sharing

Is that amount of fine knock learn something to worry about? Does anything else stand out?

My setup is a catted Invidia downpipe, stock midpipe, and a Stromung axelback.

Thanks in advance!
Hi there. Log looks good, except for possible underboosting. If you can do so safely, try to get another log, but add "TD Boost Error" parameter back in to the monitor set. At colder temps (or other conditions like higher altitude), the ECU will lower the boost target so we need to look at that parameter to see if you are actually underboosting relative to the ECU's final boost target or not.

Bill
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Old 03-06-2013, 10:39 AM   #4
Pengu
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Quote:
Originally Posted by Cobb Tuning View Post
Hi there. Log looks good, except for possible underboosting. If you can do so safely, try to get another log, but add "TD Boost Error" parameter back in to the monitor set. At colder temps (or other conditions like higher altitude), the ECU will lower the boost target so we need to look at that parameter to see if you are actually underboosting relative to the ECU's final boost target or not.

Bill
This.
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Old 03-06-2013, 11:43 AM   #5
NoUse66
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Thanks guys. I am indeed running the ACN91 map and have about 200 commuting miles on it. I'll try to get another log soon with "TD Boost Error" but the map info that shows up on the access port actually says 16.2 psi is the peak target. Is that info out of date?
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Old 03-06-2013, 12:14 PM   #6
jebjkey
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Don't know, I went with the map notes from Cobb's website.

What ever it is, TD boost error will show where you are in relation to target boost.
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Old 03-07-2013, 01:16 AM   #7
NoUse66
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New (short) log with TD boost error:
https://docs.google.com/spreadsheet/...YQk9FcGc#gid=4
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Old 03-07-2013, 01:28 AM   #8
jebjkey
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Other than the slight oscillation at the begining still, you are within 1# so you are good according to Cobb's specs.

Give the HWG a try and see how it compares on TD Boost Error.
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Old 03-07-2013, 09:49 AM   #9
Cobb Tuning
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Quote:
Originally Posted by NoUse66 View Post
New (short) log with TD boost error:
https://docs.google.com/spreadsheet/...YQk9FcGc#gid=4
The final boost target is close to the stated map target of 16.2 psi and since you are hitting fairly close to the target (less than 1 psi), you are good to go. I would not recommend the HWG map in this case - you are close enough to the target that the HWG will likely put your over and possibly by more than you would like to see, especially in higher gears or with colder temps.

Bill
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Old 03-07-2013, 06:35 PM   #10
NoUse66
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cool. thanks for the info!
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