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Old 07-11-2013, 12:52 AM   #1
mustardback
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Join Date: Jul 2009
Location: Monterey CA
Vehicle:
2003 WRX
Mostly Silver

OMGHi2U More data than you can shake a log at!

I was going to post these on the cobbtuning forums but they seem to have closed today. I've had a gander or two at the tuning guides available here and there but I'm just seeking more wizened opinions regarding knock management. If you have the knowledge/experience and the kindness of heart to take a peak at a couple third gear pulls and tell me what you think I'd gladly appreciate it.

Stage 2 with 3-port EBCS with WGDC table values multiplied .7

Basically, I've been having issues with knock as the DAM continues to drop after reset and the ECU pulls boost. Replaced knock sensor to no avail. I heard a rumor that the uppipe heatshield can sometimes rattle at the specific knock related frequencies with a modified downpipe. Going to replace the uppipe later this weekend just in case, but I have a feeling that isn't what's causing this.

The first two logs I hit close to the boost targets, but somewhere in between the end of the second one and midway through the third, the ECU pulled to mechanical boosting.

So any suggestions to keep this from recurring would be greatly appreciated. Do I retard primary ignition timing at the loads/RPMs where fine knock learning values are negative? Change fueling tables? Decrease/disable knock sensor sensitivity and boost it to 18 psi? Sell it and buy a miata?

TL;DR
I got some logs and I'm a dummy.

Thanks again.
1st
https://docs.google.com/spreadsheet/...wZXdPdGc#gid=0
2nd
https://docs.google.com/spreadsheet/...pUzRHOFE#gid=0
3rd
https://docs.google.com/spreadsheet/...Ob0FXa2c#gid=0
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Old 07-11-2013, 08:54 AM   #2
jebjkey
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Location: Naples, ITALY
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2005 STi
2006 Evolution MR

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lower timing by the ~10 that the car is already pulling, reset the ECU and see if the ECU tries to pull ~10 timing again.

If not: your problem was too much timinig
If so: you problem is something else [maybe noise similar to what you talk about with the UP]


Your AF Learning values are jacked up. Are you running an aftermarket intake? If not, you have a vacuum leak that you need to fix.
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Old 07-11-2013, 04:35 PM   #3
mustardback
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Hey thanks for the help. And should I only pull timing at the specific RPMs/load where the knock occurs, or do I taper into it, interpolating nearby values to account for different loads in different gears? Would an HKS drop in panel filter be causing the weird AF Learning values? If not is the vacuum leak upstream from the compressor?

Also, as a side question, just how high can you safely set boost targets given the stock td04 without exceeding 650cc injectors limits?
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Old 07-11-2013, 07:05 PM   #4
bluemax189
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really, immediately pull timing across everything. Then go over your car and tighten down every hose clamp you can find. Then hope your AF learning gets between +/-5%. If you cant get that you need to pressure test to find the leak. Since you just have a drop in filter no MAF calibration should be needed. Drive around and get your DAM to 16 and then start making changes slowly. Took me driving around for a couple hours tuning for EBCS, making changes slowly to see how the car responds.

Once the car is safe, figure out where in the RPM band the turbo is hitting peak boost. Adjust the wgdc around that to try and make it hit boost a little bit quicker and hold longer. Your turbo will run out of steam and taper off towards redline. Then when you get that done go to fuel tables and tune for your desired AF ratio(must have WB02). Im currently waiting on a wb02 for my car to proceed. After you get your af's where they need to be then start playing with timing.


First things first is to start with a safe map. Yours is not and from the looks of the log your cars got a leak somewhere and the car is unhappy overall, knocking like crazy, pulling timing and DAM not at 16(1 for 32 bit ecus)
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Old 07-11-2013, 09:00 PM   #5
mustardback
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Thanks for the advice. So this leak could only possibly be located somewhere between the compressor outlet and the intake manifold correct? As for safe maps, do I just reset as many values as feasible back to stock or stage 1 areas or just leave the timing table where it's at and don't rev past 4000 until I can get the AF learning and WGDC tables more copacetic?
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Old 07-11-2013, 10:50 PM   #6
mustardback
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Nevermind, I see the logic for where the <i>vacuum</i> leak would be. I retarded timing mostly in the higher ranges and began adjusting WGDC and TD correction values. Will post logs.
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Old 07-11-2013, 11:56 PM   #7
mustardback
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So I think I found my leak. Either the turbo inlet clamp, the turbo compressor clamp, the intercooler y-hose clamps, or the buildup around the MAF sensor.

https://docs.google.com/spreadsheet/...RSnR4UVE#gid=0

Still getting feedback knock, but it looks a lot more predictable and linear. Not sure if that's a good or bad thing at this point yet knowing I still have to calculate for a varied DAM.
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Old 07-12-2013, 01:43 AM   #8
mustardback
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Mostly Silver

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Got to a point today where there's no AF learning anomalies or feedback knock, but I can't figure out why the DAM hit the floor so suddenly at 3000 RPM. Any ideas?

https://docs.google.com/spreadsheet/...oVzVoREE#gid=0

Is having a cat-less downpipe the cause of this type of issue? My EGTs are easily running into the 1600s.
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