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Old 10-19-2013, 10:21 PM   #1
Pickler
Scooby Newbie
 
Member#: 301247
Join Date: Nov 2011
Location: Toronto
Vehicle:
09 Impreza 2.5i MT
White

Default saved by ECU tune

my 09 impreza was always suffering from massive knocks since new. at 48000km it was due for a spark plug change which I did but also asked the dealership to solve the knock problem. they failed to fix knock and actually ended up denying there was any knock. I actually recorded knock using a microphone inside engine bay as well as obd2 logs using a tactrix adapter. they refused to look or listen. they said they have to reproduce my problem themselves and refused to use the tactrix adapter with romraider logger or my microphone. anyway long story short I realized that I was screwed by subaru and I had to solve my problem my self. the knock was so bad that by simply running 94 octane gas the problem was Not solved.

so I ended up learning about ECU tunes and using ecu flash software with help of several forum members to fix my problem. what astounded me was how aggressive the factory tune was. it was aiming to run about 20 deg of total timing at just 2800 rpm which is where my engine knocked the most and what was worst is that my engine stays lean (closed loop) under load up until 4000 rpm! so I toned down the timing below 4500 rpm and disabled open loop delay and added fuel down low and reduced some up top. of course this took about a week of trials and logging until I managef to completly cut knock. the results just WOWed me. not only did knock stop, but the throttle response was 10x better now that the ECU was Not cutting timing due to knock sensors going crazy. So I also went about and softened the drive by wire sensitivity values to make it more linear (for better fuel economy and feel). im just so happy now, car feels great running on 89 octane but now that tempratures are getting cooler it seems 87 octane doesnt cause any knock either. will have to see what winter gas will do.
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Old 10-21-2013, 07:47 PM   #2
DougNuts
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Member#: 192568
Join Date: Oct 2008
Location: Georgetown, KY
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Nice work Pickler! It is sad to hear you had to do it yourself, but I'm sure it feels good to tackle the problem and solve it.
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