COBB PROTUNED for 11.5 AFR ECU Slowly leaning car out to dangerous AFR???? Help!!!
#31
But so far so good, after about 55 miles, we will see after work what the car will be doing.
#32
The only reason LTFT would be leaning out so much would be if your car is running consistently richer than 14.7 during closed loop. It will be interesting if it doesn't lean out anymore after the dealer visit.
#34
I will send you some of the datalogs from EVOscan later tonight to see what happening with these logs.
I do however realize that the original map I have from you Chad runs rich while cruising between 60 and 70 on the highway, where the AFR is about 12.8 to 13.6 cruising around 3000 to 3400 rpm. Might be the ECU trying to pull more fuel from the trims to make it 14.7 which in turn is causing my WOT trims to get wacky and get knock and timing retard.
#35
No I have my car wired up so I have easy access to everything. But I have been being lazy in hooking it up to EVO scan.
Goodness is my LTFT have settled down.... like whaaaaa!!!!
They are -2.4 under cruise conditions and -6.1 at idle constantly. Unless I get out of closed loop. I don't have mode23 turned on, but I do have COBB AP still installed. After another 50 miles they have not changed.
I am not sure what the values should be but this is what they are staying at currently.
I cannot test if the COBB intake, dealer fuel recall, dealer AWC reflash, fuel relay, etc... settled it down. But they are staying constant atleast.
I attached the last few from my long cruises. Used EVOSCAN.
1
http://www.mediafire.com/file/j2ygny...6_13.01.07.csv
2
http://www.mediafire.com/file/4zygly...6_19.15.29.csv
3
http://www.mediafire.com/file/bjum2d...6_19.36.01.csv
Goodness is my LTFT have settled down.... like whaaaaa!!!!
They are -2.4 under cruise conditions and -6.1 at idle constantly. Unless I get out of closed loop. I don't have mode23 turned on, but I do have COBB AP still installed. After another 50 miles they have not changed.
I am not sure what the values should be but this is what they are staying at currently.
I cannot test if the COBB intake, dealer fuel recall, dealer AWC reflash, fuel relay, etc... settled it down. But they are staying constant atleast.
I attached the last few from my long cruises. Used EVOSCAN.
1
http://www.mediafire.com/file/j2ygny...6_13.01.07.csv
2
http://www.mediafire.com/file/4zygly...6_19.15.29.csv
3
http://www.mediafire.com/file/bjum2d...6_19.36.01.csv
#36
Well I put the COBB intake back one and started datalogging. Here is what is happening. The fuel trims are slowly moving towards a negative after about a 40 minute drive.
Looks like something is up with the tune and needs a tune up.
Here is a bit after I pulled into the parking garage. The trims downed to almost -5%.
Here are LOGS from EVOSCAN.
Log 1
http://www.mediafire.com/file/z5mmji...7_20.40.09.csv
Log 2 - PIC 1
http://www.mediafire.com/file/mzrxmy...7_20.43.37.csv
Log 3- PIC 2
http://www.mediafire.com/file/fo2ijz...7_21.20.09.csv
Looks like something is up with the tune and needs a tune up.
Here is a bit after I pulled into the parking garage. The trims downed to almost -5%.
Here are LOGS from EVOSCAN.
Log 1
http://www.mediafire.com/file/z5mmji...7_20.40.09.csv
Log 2 - PIC 1
http://www.mediafire.com/file/mzrxmy...7_20.43.37.csv
Log 3- PIC 2
http://www.mediafire.com/file/fo2ijz...7_21.20.09.csv
#38
I dunno I always run Shell 93 octane. Only thing I can think Otherwise winterized fuel started coming into play.
Edit: Or somehow the elevation change over 300 mile distance. Not sure...
Thanks CBRD you guys are fantastic! Thank you for all the help!
Edit: Or somehow the elevation change over 300 mile distance. Not sure...
Thanks CBRD you guys are fantastic! Thank you for all the help!
Last edited by Clipse3GT; Oct 8, 2009 at 01:08 PM.
#39
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Some data for for people that like data
I had a 10 on the dyno last night with DW 1000cc injectors. I've tuned a bunch of them at this point, they work well.
Anyway. I was messing around with how much AFR change I would see with LTFT changes.
Car was set for 11.0 AFR at 0.3212 whatever LTFT
with a 2.0 LTFT it ran 10.7 AFR
with a 2.4 LTFT it ran 10.6 AFR
with a -1.5 LTFT it ran 11.2 AFR
Just some data, I also always error on the additive LTFT side if anything so it richens up, not leans out.
Personally I think the AFR sways with LTFT are a bit too sensitive. I know Tephra is (might be?) working on ways to either turn this off (so it acts like Evo 8's and 9's) or just reduce the sensitivity.
- Bryan
I had a 10 on the dyno last night with DW 1000cc injectors. I've tuned a bunch of them at this point, they work well.
Anyway. I was messing around with how much AFR change I would see with LTFT changes.
Car was set for 11.0 AFR at 0.3212 whatever LTFT
with a 2.0 LTFT it ran 10.7 AFR
with a 2.4 LTFT it ran 10.6 AFR
with a -1.5 LTFT it ran 11.2 AFR
Just some data, I also always error on the additive LTFT side if anything so it richens up, not leans out.
Personally I think the AFR sways with LTFT are a bit too sensitive. I know Tephra is (might be?) working on ways to either turn this off (so it acts like Evo 8's and 9's) or just reduce the sensitivity.
- Bryan
#40
Some data for for people that like data
I had a 10 on the dyno last night with DW 1000cc injectors. I've tuned a bunch of them at this point, they work well.
Anyway. I was messing around with how much AFR change I would see with LTFT changes.
Car was set for 11.0 AFR at 0.3212 whatever LTFT
with a 2.0 LTFT it ran 10.7 AFR
with a 2.4 LTFT it ran 10.6 AFR
with a -1.5 LTFT it ran 11.2 AFR
Just some data, I also always error on the additive LTFT side if anything so it richens up, not leans out.
Personally I think the AFR sways with LTFT are a bit too sensitive. I know Tephra is (might be?) working on ways to either turn this off (so it acts like Evo 8's and 9's) or just reduce the sensitivity.
- Bryan
I had a 10 on the dyno last night with DW 1000cc injectors. I've tuned a bunch of them at this point, they work well.
Anyway. I was messing around with how much AFR change I would see with LTFT changes.
Car was set for 11.0 AFR at 0.3212 whatever LTFT
with a 2.0 LTFT it ran 10.7 AFR
with a 2.4 LTFT it ran 10.6 AFR
with a -1.5 LTFT it ran 11.2 AFR
Just some data, I also always error on the additive LTFT side if anything so it richens up, not leans out.
Personally I think the AFR sways with LTFT are a bit too sensitive. I know Tephra is (might be?) working on ways to either turn this off (so it acts like Evo 8's and 9's) or just reduce the sensitivity.
- Bryan
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