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01-27-2013, 06:35 PM | #1 |
Scooby Specialist
Member#: 175401
Join Date: Mar 2008
Location: Knob Noster, MO
Vehicle:2018 Focus ST White |
Learned Ignition Timing Question
Hey all. So I'm neither a novice nor expert at tuning, but I like to think I know enough to get by. So the story is that I was stationed in Utah with high altitude and 91 octane. Then I was transferred to Maryland with low altitude and 93 octane. I was over-boosting because of the lower altitude and I was able to tune that out using the WGDC table. Next I'm trying to increase the timing to make the most out of the 93 octane.
I have a 07 WRX TR with a TXS turboback, Cobb intake with GS intake elbow, GS 3-port EBCS, and an 08 STI TMIC. The reason I'm posting is because I'm not sure why exactly, when I log after a tune, the Learned Ignition Timing is consistently a +3 to +6 throughout the RPM range. Then if I try and raise the timing in those ranges, I start getting timing pulled in my Fine Learning Knock Correction section of the spreadsheet. In the areas that the LIT is raised 6*, I would raise it 4* in the table, but the LIT still trys to add 6* on top of that. This is causing me to have too much timing and my IAM drops and I get pulled timing in the FLKC column. Basically I'm trying to find out why my LIT is always as high as it can go. Any help is greatly appreciated. Thanks.
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01-27-2013, 09:16 PM | #2 |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
What is 'learned ignition timing'? In other words, what is the real name for it on the logger?
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01-27-2013, 10:25 PM | #3 |
Scooby Specialist
Member#: 175401
Join Date: Mar 2008
Location: Knob Noster, MO
Vehicle:2018 Focus ST White |
That's just one of the check boxes when you're choosing what you want to log. Not sure what else to call it since that's exactly what it says in the top of the column.
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01-27-2013, 11:16 PM | #4 |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
Ahh, realized you're an '07... Timing sucks on these. Could you post some datalogs?
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01-28-2013, 10:32 AM | #5 |
Scooby Specialist
Member#: 169716
Join Date: Jan 2008
Chapter/Region:
Tri-State
Location: Albany, NY
Vehicle:2005 WRX STi WTF Tuned |
Are you logging the amount of advance the ECU is adding?
Post a picture of your KCA Max table with your logs. |
01-28-2013, 11:31 AM | #6 |
Scooby Specialist
Member#: 175401
Join Date: Mar 2008
Location: Knob Noster, MO
Vehicle:2018 Focus ST White |
Isn't the Learned Ignition Timing and Fine Learning Knock Correction the two that show what the ECU is adding? For example, when I started off adjusting my timing, it was set at 11.29* on the base timing table for 2.5 Engine Load at 6400 RPMs. When I logged it, it was showing 18* Ignition Total Timing and 7.5* in the Learned Ignition Timing. The Fine Learning Knock Correction was at 0. I'm just using this as one example since I don't know how to post a spreadsheet. After several increases of 1* throughout the powerband, the Learned Ignition Timing dropped to 6 but no lower. The Ignition Total Timing would continue to raise as I increased the Base Timing, until eventually I ran into my IAM dropping and a couple instances of -1.5 of Fine Learning Knock Correction.
As for the KCA Max table, basically everything starting at 1.40 Engine Load and up is between 4.92 and 5.27. |
01-28-2013, 06:16 PM | #7 | |
Scooby Specialist
Member#: 169716
Join Date: Jan 2008
Chapter/Region:
Tri-State
Location: Albany, NY
Vehicle:2005 WRX STi WTF Tuned |
Quote:
So KCA Max @ 6400/2.5 is lower than the 7.5° you see in your log? Honestly, I never bother logging Base Timing / Learned Timing. All I really care about is Ignition Total Timing. Then again, I run a flat 8° KCA Max table. Last edited by idipskoalmint; 01-28-2013 at 06:42 PM. |
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01-28-2013, 06:47 PM | #8 |
Scooby Specialist
Member#: 175401
Join Date: Mar 2008
Location: Knob Noster, MO
Vehicle:2018 Focus ST White |
So after screwing around with it all day I finally figured it out. In RomRaider if you're at the Base Timing table, if you click 'View', then 'Table Properties', it breaks down exactly what is happening to get the Ignition Total Timing. Here's what it says, "This is the base level of timing. Total timing = base timing + knock correction advance + other timing compensations. Knock correction advance = (knock correction advance max map value * current advance multiplier) + feedback knock correction + fine knock correction."
So basically the Knock Correction Advance Max table(multiplied by the IAM) will always be added to the Base Timing table. I just thought that the KCA Max table was used for fine learning, not for rough corrections for when the IAM drops. Thanks anyway for the help guys. |
01-28-2013, 06:53 PM | #9 | |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
Quote:
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01-28-2013, 08:48 PM | #10 | |
Scooby Specialist
Member#: 169716
Join Date: Jan 2008
Chapter/Region:
Tri-State
Location: Albany, NY
Vehicle:2005 WRX STi WTF Tuned |
Quote:
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