Author Topic: Question on datalog  (Read 1306 times)

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Offline kingbird72

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Question on datalog
« on: July 12, 2016, 09:42:03 AM »
Good day everyone, Finally got an AP V3 for the 2013 STI, installed OTS 91ACN and reset the ECU around 50kms ago, the car has been running on Ultra94 since day one. I did 2 datalog if anyone could please give me some advise on the feedback knock. None of my logs have any Fine Knock, I did one datalog using S mode (log 1) and the S# mode ( log 2) it's the one that shows feedback knock up to -2.45, any advise will be greatly appreciated.

Offline 10secdream

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Re: Question on datalog
« Reply #1 on: July 12, 2016, 09:55:31 AM »
Perhaps try running the vehicle with a different tank of gas or use something different entirely. If this was my car I would run Shell 91 or Husky 94 because Ultra94 is a little too inconsistent for my liking.
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Offline kingbird72

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Re: Question on datalog
« Reply #2 on: July 12, 2016, 10:01:11 AM »
I'm concerned about the -2.45 feedback knock, I will change it to Husky 94 and see what happens when this tank is done.

Offline Stealthbombing

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Re: Question on datalog
« Reply #3 on: July 12, 2016, 10:50:23 AM »
COBB OTS tunes arnt the greatest for vehicle of our altitude, its been proven they run better on vehicles at sea level. A pro tune would fix the problem completely, but for now keep an eye on your DAM, if it drops below 1 there are some problems. 

I agree with trying Husky 94
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Offline kingbird72

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Re: Question on datalog
« Reply #4 on: July 12, 2016, 08:16:52 PM »
based on the feedback knock number in the log , should this be a major concern??

Offline greatnorthgnome

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Re: Question on datalog
« Reply #5 on: July 12, 2016, 10:31:18 PM »
Try a different fuel. Shell 91 and husky 94 always seem to be reliable.

Offline Airboy

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Re: Question on datalog
« Reply #6 on: July 12, 2016, 11:42:54 PM »
The next time you data log, make sure to push the pedal all the way.  Your logs looked like you were modulating the pedal.  Boost sits at ~8psi for a while then jumps to 15psi, as WGDC jumps from 0%

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Offline kingbird72

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Re: Question on datalog
« Reply #7 on: July 13, 2016, 11:17:37 AM »
I will make sure I stab on the throttle when I do my next log tomorrow, I eased into the throttle to avoid creating false knock.

Offline kingbird72

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Re: Question on datalog
« Reply #8 on: July 14, 2016, 02:51:07 PM »
Here is another log I did today, car was in S mode. I don't see any feedback knock or Fine Knock, however I see that the wastegate duty cycle under full throttle only shows between 38.43% to 41.57%, shouldn't it be at 100% under full throttle?? The car does hit target boost up to 14 PSI, I'm currently running OTS stage 1 91ACN NWG, any feedback will be greatly appreciated. Thank you

Offline 10secdream

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Re: Question on datalog
« Reply #9 on: July 14, 2016, 03:26:55 PM »
Your wastegate duty cycle are fine. It is when you start pushing higher wastegate duty cycles and not reaching target boosts that you have a problem and since you are reaching target boost there is no need for a higher duty cycle.


You log seems decent but I would start out lower in the RPM range (2500 rpm ish) and then go to redline.
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Offline kingbird72

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Re: Question on datalog
« Reply #10 on: July 14, 2016, 08:04:31 PM »
Thanks for the information, I will do another data log on S# this time and starting from 2500rpm.

Offline kingbird72

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Re: Question on datalog
« Reply #11 on: July 25, 2016, 03:00:45 PM »
I've has chance to data log again, this time I data log a bit longer trying to find out where and when the FBK occur and noticed "partial throttle" had some FBK between -0.35 to -1.4 . I ran out of room while doing the log so I couldn't go to the redline but close enough. Please see attached log and provide some feedback.