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Old 09-22-2012, 12:08 PM   #1
6lug
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Member#: 108817
Join Date: Feb 2006
Default Sometimes knock, sometimes not, WOT..Datalogs

First data logs Ive ever done. Just did them. 3 of the 5 below show Feedback Knock Correction about 5000 RPM and up. 2 are clean as a whistle. ???? Confused here. All the other stuff looks pretty good.

2004 STi
K&N drop in
TBE (Maddad DP & Midpipe 3", Prodrive axleback 2.5")
catless UP
No wideband
Stg 2 OTS map, 93 Octane, normal wastegate

Temp was 78*, some of the pulls were up *VERY SLIGHT* hills, some down, but I don't think it correlated to the runs that indicate knock.

Should I switch down to the 91 map (even though I buy 93?) Also, I have not reflashed in a couple of months so do I need to log my AF Learning 1A, B, C, D and report back?

(Sorry for the maps being out of order, but they are numbered from 4-8, 4 being my first run, 8 being the last)

https://docs.google.com/spreadsheet/...UFFWlNNVE9zSmc

https://docs.google.com/spreadsheet/...XhEU3ZxaTJ0R3c

https://docs.google.com/spreadsheet/...VpVVkFBNWFZUEE

https://docs.google.com/spreadsheet/...DNGVWxsTEZYYUE

https://docs.google.com/spreadsheet/...khFUUNMU01XdXc
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Last edited by 6lug; 09-22-2012 at 03:24 PM.
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Old 09-22-2012, 06:26 PM   #2
johnmkv
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Join Date: Nov 2011
Chapter/Region: MWSOC
Vehicle:
2012 WRX
LR

Default

I dont see any knock in the rpm range you suggested. There seems to be knock that happens when you mash the throttle and abruptly lift of the throttle. Im no expert but they look good to me.
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Old 09-22-2012, 07:13 PM   #3
6lug
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"feedback knock" columns. The -2 and -1 values...isn't that a knock correction factor?
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Old 09-23-2012, 11:04 AM   #4
Cobb Tuning
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Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
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Quote:
Originally Posted by 6lug View Post
First data logs Ive ever done. Just did them. 3 of the 5 below show Feedback Knock Correction about 5000 RPM and up. 2 are clean as a whistle. ???? Confused here. All the other stuff looks pretty good.

2004 STi
K&N drop in
TBE (Maddad DP & Midpipe 3", Prodrive axleback 2.5")
catless UP
No wideband
Stg 2 OTS map, 93 Octane, normal wastegate

Temp was 78*, some of the pulls were up *VERY SLIGHT* hills, some down, but I don't think it correlated to the runs that indicate knock.

Should I switch down to the 91 map (even though I buy 93?) Also, I have not reflashed in a couple of months so do I need to log my AF Learning 1A, B, C, D and report back?

(Sorry for the maps being out of order, but they are numbered from 4-8, 4 being my first run, 8 being the last)

https://docs.google.com/spreadsheet/...UFFWlNNVE9zSmc

https://docs.google.com/spreadsheet/...XhEU3ZxaTJ0R3c

https://docs.google.com/spreadsheet/...VpVVkFBNWFZUEE

https://docs.google.com/spreadsheet/...DNGVWxsTEZYYUE

https://docs.google.com/spreadsheet/...khFUUNMU01XdXc
You have a fairly consistent single knock event in the middle of the WOT runs. I would go ahead and reflash the 91 octane map (while still running the 93 gas). You said you haven't reflashed for a while - have you reset the ECU or disconnected the car's battery recently?

Bill
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Old 09-23-2012, 11:56 AM   #5
6lug
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Member#: 108817
Join Date: Feb 2006
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10-4...I downloaded AccessTUNER and am reading everything I can right now to learn to tune, so I will reflash the 91 map, then try to tune the 93 OTS map to get rid of that spot I guess. Values of 2 and 1 arent too crazy right?

No I have not reflashed in a few months, nor have I reset the ECU or disco'd the batt.
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Old 09-23-2012, 12:40 PM   #6
Cobb Tuning
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Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
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Quote:
Originally Posted by 6lug View Post
10-4...I downloaded AccessTUNER and am reading everything I can right now to learn to tune, so I will reflash the 91 map, then try to tune the 93 OTS map to get rid of that spot I guess. Values of 2 and 1 arent too crazy right?

No I have not reflashed in a few months, nor have I reset the ECU or disco'd the batt.
For this ECU, a single knock event will be in steps of -2 (for feedback knock correction). So, when you see -2, -2, -2, ..., -1, -1, ..., 0, that means that you had a single knock event at the first -2 and the rest is the ECU holding the value and slowly ramping back to zero. Where the correction occurs is a key piece of information. If it happens when mashing the throttle or abruptly lifting off the throttle, or at very low load, it is generally noise and can be ignored. When you get consistent knock events in the middle of the WOT run, for example, that is more of a concern. It is excessive in your case, but definitely something you want to address. It could be poor fuel quality or a mechanical issue or the car just respond better to less ign. timing or boost. In this case, you can flash the 91 or 91ACN map and see how things improve.

Bill
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Old 09-23-2012, 03:40 PM   #7
6lug
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Join Date: Feb 2006
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Quote:
Originally Posted by Cobb Tuning View Post
It is excessive in your case, but definitely something you want to address.

Bill
"Is" or "is not" excessive...?? Sorry, you said "but" so I'm not sure. I just want to be sure I'm not f***ing up my motor.

I will reflash to a 91 map tho.

Thanks Bill
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Old 09-23-2012, 06:53 PM   #8
Cobb Tuning
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Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
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Quote:
Originally Posted by 6lug View Post
"Is" or "is not" excessive...?? Sorry, you said "but" so I'm not sure. I just want to be sure I'm not f***ing up my motor.

I will reflash to a 91 map tho.

Thanks Bill
Sorry, I meant to say not excessive, but definitely something that you should address. Also, try to see what enthusiasts in your local area recommend for a quality fuel. There can be variances in the knock resistance among various brands (and sometimes even stations themselves).

Bill
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