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Old 01-21-2013, 12:53 PM   #1
ElSpa
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Member#: 196674
Join Date: Dec 2008
Location: Bucharest, Romania
Default Trying to find what's wrong - knock correction advance

Hi guys,

I recently bought a 2004 JDM 2.0 STI with stock tune, AEM intake, HKS bov, full Sebring exhaust, TwinDisc HKS clutch. The spark plugs are new.

I made some logs to check the car out and found something strage....when it makes boost (10psi+) it starts knock correction +7 and climbs up to +10....but doesn't light up any engine code.....
It does this with the MAF pugged or unplugged, with the stock map and with a stage1 map that I had from me previous 2002 STI.

What else can I check can I check to see what's wrong beside the maf sensor ?

Thanks !
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Last edited by ElSpa; 01-21-2013 at 01:02 PM.
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Old 01-21-2013, 09:06 PM   #2
JulianDelphiki
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Join Date: Jan 2012
Chapter/Region: South East
Location: FL
Vehicle:
1997 OBS V8 Ej207
Stimikey tuned

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Old 01-21-2013, 09:41 PM   #3
mxturboracer86
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Chapter/Region: MWSOC
Location: Chicago
Vehicle:
2013 SXL
555 Motorsports

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Log feedback and fine learning. If you are saying the numbers are +7 to +10, then you don't have an issue, if you are seeing negative numbers in feedback or fine learning and knock Correction, it's knocking.

Knock correction is actually dynamic timing, like added timing, it's how subaru tunes their ecus
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Old 01-21-2013, 11:47 PM   #4
ElSpa
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thanks guys
the only problem was that when I uploaded my stage 1 map it has a slight hesitation when the ecu was adding timing (when it starts making 10+ psi). What paramaeters should I log to see what the problem is ? The lambda goes 0.77 wich I belive is very rich and I can smell it too.
If it was a fuel delivery problem (I was told that the car has an uprated fuel pump, but....) how an I check that ? What were the symptons if it had a stock fuel pump on a stage 1 map ?
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Old 01-27-2013, 12:09 AM   #5
mxturboracer86
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I'd recommend checking for a Boost leak, start by looking at intercooler and hoses that connect to it. Leak there will make it run rich
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Old 04-08-2013, 03:57 PM   #6
xionc
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Hey sorry to thread jack but my question is related to how the ECU handles timing.

So as I understand it, at least on an 05 STi:

Total timing = Base Timing + Knock Correction Advance (KCA) + Other Compensations

Where other compensations can be the FBKC, FLKC, IAT, etc.

The KCA is what I have a question about. It is stated as:

KCA = ((((KCA condition low*multiplier) + (KCA condition high*(1-multiplier))) * IAM) + (KCA Additive*multiplier))

Depending on the value of the multiplier (0 through 1) you can use just the low condition table, just the high condition table, or a blend of both. Then the additive table adds some on top of that. Are you guys flattening out any of the table values, if so to what? And would you zero any tables out?

Thanks!
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