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10-10-2012, 01:28 AM | #1 |
Scooby Newbie
Member#: 293573
Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
sti wont keep tune?
first off heres a little info about the car, 2006 sti, has headers full catless exhaust(perrin dp, cobb cat back) spt intake, and a pro tune. so heres the deal recently ive been having an issue which seems like the tune fades on the car? i can flash it and for a few days the car will hit target boost which is 18.5 psi, then one day it wont go over 12-13. im getting no trouble codes or anything other than the car not boosting its running fine.
if once i realize it dosnt hit target boost i can flash it and the car is back to target boost again. has anyone else ever heard of this? its very strange to say the least
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10-10-2012, 02:01 AM | #2 |
Former Vendor
Member#: 309599
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2006 WRX STi CGM |
As weird as this is going to sound, check your coolant reservoir for your turbo and radiator. If they are low or empty, top them off with 50/50 coolant. From my understanding when the coolant is low, the DAM of your car will drop below the value of 1.0 and therefore reducing the target boost level. Then reset your ECU with Cobb AP
That is what I was told to do when I had the same problem and it worked for me. Once I datalogged the car it all made sense. Datalog it and post up the file and it will narrow down some possibilities. I'd also perform a compression test to be on the safe side -$30 kit from AutoZone, about 2-3 hours to do it yourself with some instructions from NASIOC/IWSTI wouldn't hurt. -Jason |
10-10-2012, 02:02 AM | #3 |
Former Vendor
Member#: 309599
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2006 WRX STi CGM |
Also, when did you perform those mods and when did the problem start happening? Do you have a bigger fuel pump?
-Jason |
10-10-2012, 02:49 AM | #4 |
Scooby Newbie
Member#: 15306
Join Date: Feb 2002
Location: FRANCE
Vehicle:2011 STi White pearl |
Are you tuning your car yourself ?
If when you reflash the car it seems to recover power, it's only because you have a problem with the learnings. I bet that instead of reflashing the car if you perform an ECU reset, you will recover power as well. So it's just a bad tune, or eventually a leak somewhere. |
10-10-2012, 03:19 AM | #5 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
I would almost bet that your IAM is just dropping over time. That will cause the ECU to cut your boost roughly in half.
Maybe you need higher octane fuel, or maybe your tune is just too aggressive for the fuel that you have. |
10-10-2012, 04:00 AM | #6 |
Scooby Specialist
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:05 sti e85@420hp |
My $.02, the ecu is learning, it sees something it doesn't like and is pulling power to be safe. Could be knock form different fuel, heat, aggressive tune, etc. Data log.
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10-10-2012, 10:40 AM | #7 |
Scooby Guru
Member#: 32669
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Chapter/Region:
SCIC
Location: Woodland Hills
Vehicle:2007 2.34LR, EFR7670 LINK G4+ hybrid STi |
If you keep re-flashing over your learned tune you will be purchasing a new engine soon. You need to data log and find out why your engine is not happy and rectify the problem.
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10-10-2012, 10:40 AM | #8 | ||||
Scooby Newbie
Member#: 293573
Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
Quote:
Quote:
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what things should i data log to get good info? |
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10-10-2012, 11:04 AM | #9 |
Scooby Specialist
Member#: 276209
Join Date: Mar 2011
Chapter/Region:
MWSOC
Location: Windy City
Vehicle:I am Rub Function>Form |
you need to log:
A/f learning A/f correction Engine Load Feedback Knock Correction Fine learn knock correction IAM MAFv MAP (corrected) Throtle open angle Vehicle Speed |
10-10-2012, 02:44 PM | #10 | |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
Quote:
AFR would be helpful too, preferably from an aftermarket wideband setup. |
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10-10-2012, 09:02 PM | #11 |
Scooby Newbie
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Join Date: Dec 2010
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yep.. logs. Need to see the data.
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10-10-2012, 11:55 PM | #12 |
Scooby Newbie
Member#: 293573
Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
https://docs.google.com/a/folsombike...BR0dSNEE#gid=0
heres the log 3rd gear pull, seems like some knock? |
10-11-2012, 01:05 AM | #13 | ||
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
Quote:
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10-11-2012, 10:25 AM | #14 |
Scooby Specialist
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E. Canada
Location: Toronto, canada
Vehicle:2006 IWL Stg2 OBP |
Stating the obvious here, any STI owner would be smart enough to not run 91octane or mixed fuel or octane booster or any of that crap. you should be running 94octane. mixing fuels will only confuse your ECU. it could be that you had 94octane when you went for your protune.
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10-11-2012, 10:47 AM | #15 |
Scooby Newbie
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Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
i live in california. 91 is the highest we have here thank for the input tho
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10-11-2012, 10:55 AM | #16 |
Scooby Specialist
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:05 sti e85@420hp |
In some areas 91 is the top grade. The ecu should learn the fuel, which it sounds like it's trying to do. It doesn't like what it's seeing. And yes, from experience, you can damage a motor with peemix quicker than the ecu can pull timing/ boost. Liked mentioned, if you got tuned on a higher grade fuel you should be using that fuel all the time.
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10-11-2012, 11:37 AM | #17 |
Scooby Newbie
Member#: 293573
Join Date: Sep 2011
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Vehicle:2006 sti OBP on Meth |
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10-11-2012, 11:47 AM | #18 | |
Scooby Specialist
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Location: New Jersey Shore
Vehicle:2011 WRX Limited Black |
Quote:
91 is perfectly fine, not ideal, but it works fine stock or if tuned for it. |
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10-11-2012, 12:21 PM | #19 | |
Scooby Specialist
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Join Date: Mar 2011
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MWSOC
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Vehicle:I am Rub Function>Form |
Quote:
According to this log you're peaking boost @ 16.87 at ~4600rpm. If you are still on the stock vf39 then you are peaking boost really late in your powerband and you likely have an exhaust leak, malfunction bcs, or wastegate actuator. There are also some instances of some fairly substantial knock events (the -6 and -5). More concerning is that your DAM started off at 0.75 which means you either had just flashed the map or your ECU has been experiencing knock consistantly and has lowered this value to reduce timing and boost in order to protect your engine. |
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10-11-2012, 02:06 PM | #20 |
Scooby Newbie
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10-11-2012, 03:47 PM | #21 | ||
Scooby Guru
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Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
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18 degrees of timing at 2.5 g/rev and 5600 RPM is pretty high, I think the tune probably needs to be mellowed out. |
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10-12-2012, 12:11 AM | #22 | |
Scooby Newbie
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Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
Quote:
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10-12-2012, 07:55 PM | #23 |
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change the front o2 sensor
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10-13-2012, 01:31 AM | #24 |
Scooby Newbie
Member#: 293573
Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
o2 sensor is no more than 6 months old, but it definitely could be the problem ill look into it! thanks!
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10-13-2012, 01:44 AM | #25 |
Scooby Newbie
Member#: 293573
Join Date: Sep 2011
Location: northern california
Vehicle:2006 sti OBP on Meth |
heres one more data log that i did today with a 4th gear pull, lots of knock apparently. some thing with the tune? or could it be a faulty sensor?
https://docs.google.com/spreadsheet/...yUkhqLWc#gid=0 |
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