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Old 03-04-2013, 10:44 AM   #1
sheshani
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Default too lean and knocks

I have 2002 sti impreza and just did maf scaling with help from you guys last week.

after installing external AFR (AEM UEGO 30-4100 ) I did some runs and logged the data and found its too lean even on 1 bar boost.

also there is large number of knocks in deferent load/rpm.

my injectors duty cycle is up to 70%. (do I need to upgrade fuel pump and add fuel regulator? since I have been told that my injectors are 540cc but not sure about it)

my openloop table seems set to Reich.
as I been told I think I have to drop timing to solve the knock but have no idea how to make it richer.

I attached the logs and tables hope you can help me find my way to fix fueling




http://www.sheshani.com/sti/log1.csv
http://www.sheshani.com/sti/log2.csv
http://www.sheshani.com/sti/log3.csv
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Old 03-04-2013, 10:52 AM   #2
endrswrd
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If your fueling is off that much it means you screwed up your MAF scaling. OL fueling depends purely on Injector settings and MAF scaling + (some compensation tables). If you are using stock injectors you can assume the injector settings are okay, that leave just you MAF scaling as suspect.
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Old 03-04-2013, 11:55 AM   #3
Airboy
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-Check for air leak in the turbo inlet hose after the MAF
-Check fuel pressure
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Old 03-04-2013, 12:22 PM   #4
endrswrd
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I guess I should have never assumed that hardware was checked previously. So +1 to what airboy recommended.
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Old 03-17-2013, 06:38 PM   #5
kaleonearth
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1. Check your maf scaling. Your final fueling should be within 2-3% + or - the wideband's reading across the board.

2. That fueling table is way too rich IMHO. I shoot for 10.5/10.7. It all really depends on where your timing takes you in the map but it looks rich to me. It is my understanding that lower than 10.0 or so you're washing the oil off of your cylinder walls with the excess fuel.
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Old 03-19-2013, 05:12 PM   #6
sheshani
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yes it look so rich, its JDM ecu it seems they run high octane in japan.
i modified the table by adding 1 degree to the table but i didn't uploaded it yet because there seems problem in my fuel supply due to fuel bump.
my injectors duty cycle reach 75% on vf28 turbo witch is high.
when i added 10% more to maf scaling table duty cycle increased to 85% and logging shows richer in mid rpm but went more lean (14.8) at high rpm.
i'm up to install walbro 255 bump and check results then upload new afr table
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Old 03-19-2013, 05:18 PM   #7
sheshani
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i logged vales between 2-10 in knock correction while WOT on third gear but i don't know whats the values you can say its high when talking about knocks.
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Old 03-19-2013, 05:54 PM   #8
dux10
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I offered to help you. Check your PM's.
And values as high as 10 is NOT good at all! What octane fuel do you have available in Jordan???

It seems really weird that AFR in solid boost at higher RPM would lean out that much unless something is seriously wrong (post maf sensor leak)!!
Please becareful before you turn this thing into a paperweight....

Steve @ Pullz-On Tuning
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Old 03-20-2013, 01:16 PM   #9
sheshani
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Problem Fixed
i replaced the fuel bump and i started getting rich AFR values.
Please if someone can open the log attached and check the knock correction its up to 10.5
i set the EVC to 1 bar running low octane fuel here in jordan.
is there anyway to solve the knock without reducing the timing ??
even with fuel bump and fuel regulator i still log injectors duty cycle up to 80% on 540 cc pink injectors ( is it normal)??
note: i added 10% on maf scaling

Learning view log:
CAL ID:A4SD900B
Description: 01/02 JDM Impreza STi MT/AT
ECU ID:1B04490605

IAM 16

A/F Learning #1:
0 - <5.60 5.60 - <10.00 10.00 - <50.00 50.00+
2.05 -3.52 -10.06 0

FLKC Table 0 - <0.60 0.60 - <0.90 0.90 - <1.20 1.20 - <1.50 1.50 - <1.80 1.80 - <2.10 2.10 - <2.30 2.30+
0 - <600 0 0 0 0 0 0 0 0
600 - <1200 0 0 0 0 0 0 0 0
1200 - <2000 0 0 0 0 0 0 0 0
2000 - <2700 0 0 0 0 0 0 0 0
2700 - <3900 0 0 0 0 0 0 0 0
3900 - <5000 0 0 0 -0.7 0 0 0 0
5000 - <5600 0 0 0 0 0 0 0 0
5600+ 0 0 0 0 0 0 0 0

current open loop AFR table.

http://www.sheshani.com/sti/log4.csv
http://www.sheshani.com/sti/maf3_2.bin

Last edited by sheshani; 03-20-2013 at 01:29 PM.
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Old 03-20-2013, 05:30 PM   #10
Airboy
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Knock Correction Advance is amount of advance added to the base ignition value, not the amount of ignition retard from knock. Log Feedback Knock correction, Fine Learned Correction, and Ignition Advance Multiplier(IAM).

Compared your log to the ROM from the above post. ECU is pulling ~2* above 5600rpm.


AFR is still leaner than the fuel map. Which intake are you using?

Last edited by Airboy; 03-20-2013 at 07:45 PM.
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Old 03-21-2013, 12:49 AM   #11
sheshani
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Quote:
Originally Posted by Airboy View Post
Knock Correction Advance is amount of advance added to the base ignition value, not the amount of ignition retard from knock. Log Feedback Knock correction, Fine Learned Correction, and Ignition Advance Multiplier(IAM).

Compared your log to the ROM from the above post. ECU is pulling ~2* above 5600rpm.

AFR is still leaner than the fuel map. Which intake are you using?
im using spec c intake.
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Old 03-21-2013, 06:02 AM   #12
sheshani
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i logged the knocks as follows:
IAM :16
feedback knock : 0
fine learning knock:
-4.22 1.8 load 5300-5800 rpm
-6.33 1.8 load >6000 rpm

ill go to reduce timing for this range.
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Old 03-21-2013, 11:01 AM   #13
sheshani
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Airboy: i'm going to install TD-05 20G turbo what should i take in consideration when i upgrade to the new turbo

Last edited by sheshani; 03-21-2013 at 03:22 PM.
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Old 03-21-2013, 08:33 PM   #14
Airboy
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Quote:
Originally Posted by sheshani View Post
Airboy: i'm going to install TD-05 20G turbo what should i take in consideration when i upgrade to the new turbo
First, figure out how to tune your car with the stock turbo.
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Old 03-21-2013, 08:48 PM   #15
jaxscuby
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+1..airboy's recommendation
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Old 03-22-2013, 04:37 AM   #16
sheshani
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Quote:
Originally Posted by Airboy View Post
First, figure out how to tune your car with the stock turbo.
nice, what next subjects i have to focus at after this stage for beginer.
i did maf scaling, solved lean fuel issue, increased the boost step by step to 1.1 bar without knocks.

but still not familar with boost tabels and many other tables & concepts .

i read more than i change to the car but more i read more i feel lost.
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Old 03-22-2013, 09:59 AM   #17
insaneimpreza
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Totally agree, I would get this nailed down before adding more confusion to the mess!! But when you do swap to the 20g, I would remove 4* from the higher load 20+ degree timing cells to start. Just my .02
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