So my car seems to be running lean then goes to rich. Specifically lean 1.0 to then .69 rich. Does anyone have any insight on what this number should be around and what could be causing it to do what it's doing? 2010 sho non pp. roughly 45k miles. Completely stock. No check engine lights. Just reading numbers and getting a baseline before tuning. But as of now the tunes are on hold. Thanks in advance for the help. No warranty and whatever work is to be done will be by me. Just thought I'd come here first to see what kind of help I can get!
Probably normal for bone stock. OEM tunes do run richer at heavy throttle than aftermarket tunes, one way to combat engine kaboom tendencies perhaps. This makes the stock SHO somewhat of a portly racer compared to the lean speed racers that result from aftermarket tunes.
Let me check my logs, but I recall these cars running stupid rich stock under load... I recall seeing .6X...
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It just seems odd how it goes from 1.0 to .69 doesn't that seem like a far fluctuation?
Need a datalog ....not good to look at max and min values from a drive session....there are times of runout and tip ins where you can be very rich or lean for a split second....best to look at specific areas when evaluating things and not just the mins and max...have you logged a wot pull?
Not sure if you are logging with SCT or not.. but here is a stock datalog... in second gear under WOT I am seeing .68 lambda... and I start at 1.02 before mashing the pedal...
Purple is gear, gold is RPM, and red is lambda(AFR)...
I seem to recall the stock lambda target being somewhere in the .7x so definitely could see going to .69 on a hard tip in event. And it always will lean out when there is no pedal input/on tip out for emissions and fuel economy reasons.
Typically you should expect to see somewhere between .82-.87 once tuned for your lambda target.
Post a log up!
Quote from: derfdog15 on January 30, 2017, 08:52:15 PM
I seem to recall the stock lambda target being somewhere in the .7x so definitely could see going to .69 on a hard tip in event. And it always will lean out when there is no pedal input/on tip out for emissions and fuel economy reasons.
Typically you should expect to see somewhere between .82-.87 once tuned for your lambda target.
Post a log up!
Depending on year maybe? My lambse WOT at the end of second into third is .68... I have a 2010...
.82-.87 is probably accurate if your tuned for E20... .80 is what I see most guys running tuned at least in the SCT tuned world...
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Quote from: StealBlueSho on January 30, 2017, 09:06:39 PM
Quote from: derfdog15 on January 30, 2017, 08:52:15 PM
I seem to recall the stock lambda target being somewhere in the .7x so definitely could see going to .69 on a hard tip in event. And it always will lean out when there is no pedal input/on tip out for emissions and fuel economy reasons.
Typically you should expect to see somewhere between .82-.87 once tuned for your lambda target.
Post a log up!
Depending on year maybe? My lambse WOT at the end of second into third is .68... I have a 2010...
.82-.87 is probably accurate if your tuned for E20... .80 is what I see most guys running tuned at least in the SCT tuned world...
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You may be correct, I just looked at my one stock log (I am amazed AJPTurbo had the patience to look through it) and my rang was .7 to 1.05 on stock logic and 93 octane.
My last Rev of 93 (rev6) range was from .79 to 1.01.
Most recent E20 rev (rev21), .79 to 1.05 and I believe my target is .85 while WOT.
Logs attached. Enjoy!
Desired Lambda at WOT for a 2010
Desired Lambda at WOT 2015
Those are for open loop basically....All other times at closed loop it will be 1.0
Quote from: AJP turbo on January 30, 2017, 10:22:28 PM
Desired Lambda at WOT 2015
Those are for open loop basically....All other times at closed loop it will be 1.0
What's the X axis referencing?
Definitely different though, I wonder what drove that change.
Quote from: derfdog15 on January 30, 2017, 10:25:19 PM
Quote from: AJP turbo on January 30, 2017, 10:22:28 PM
Desired Lambda at WOT 2015
Those are for open loop basically....All other times at closed loop it will be 1.0
What's the X axis referencing?
Definitely different though, I wonder what drove that change.
coolant temp
Quote from: AJP turbo on January 30, 2017, 10:22:28 PM
Desired Lambda at WOT 2015
Those are for open loop basically....All other times at closed loop it will be 1.0
God i wish you'd post more screenshots like that just to give an idea of what the tuning tables look like. That one is almost surprisingly simple! . . i'm sure i'm being naive though
Okay here is the log from the sct x4. Run is a second gear pull 2k rpms to 6500, wot. The gold line is rpms the red is afr bank 2 the green is afr bank 1. The car is on the oem tune with 93 octane. Outside air temperature was about 55 degrees.
Looks like mine if I were to do a second gear only pull.
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Quote from: AJP turbo on January 30, 2017, 10:19:04 PM
Desired Lambda at WOT for a 2010
Interesting, I could post my log, but under WOT, stock, my desired lambda is .68 in second gear along with most of third. This is significantly richer than the table you posted.
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Quote from: Shmike281 on January 31, 2017, 12:21:21 AM
Okay here is the log from the sct x4. Run is a second gear pull 2k rpms to 6500, wot. The gold line is rpms the red is afr bank 2 the green is afr bank 1. The car is on the oem tune with 93 octane. Outside air temperature was about 55 degrees.
I would be more worried if AFR1 deviated significantly from AFR2, in general terms. Your data shows very minor blips, nothing to be concerned about.
Quote from: StealBlueSho on January 31, 2017, 05:11:17 AM
Quote from: AJP turbo on January 30, 2017, 10:19:04 PM
Desired Lambda at WOT for a 2010
Interesting, I could post my log, but under WOT, stock, my desired lambda is .68 in second gear along with most of third. This is significantly richer than the table you posted.
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There are modifiers also
But OP the screenshot looks normal...enrichment doesnt happen until really late and then goes really rich
To the OP, if both banks agree on AFR, and we can say that you AFRs look normal, then I wouldn't be worried about a tune.
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If you log LAMBSE you will see what the target afr should be...then just check that against measured lambda.
Now its time for boost and a tune sir
Quote from: AJP turbo on January 31, 2017, 09:39:29 AM
Now its time for boost and a tune sir
Then you can officially join the AJP Turbo "Nut-Huggers" convention, as @Colorado-SHOBro so eloquently dubbed it!
http://www.ecoboostperformanceforum.com/index.php/topic,7369.msg112287.html#msg112287 (http://www.ecoboostperformanceforum.com/index.php/topic,7369.msg112287.html#msg112287)
Careful....im not sure if you are allowed to say nut hugger on this fine forum...might be too strong of language....im afraid to say the word damn or hell without fear of retribution ...moderators will pounce
Not a bad practice though in case 3 year olds learn to read
I think you give 3 year olds too little credit.
Quote from: AJP turbo on January 31, 2017, 10:03:54 AM
Careful....im not sure if you are allowed to say nut hugger on this fine forum...might be too strong of language....im afraid to say the word damn or hell without fear of retribution ...moderators will pounce
Not a bad practice though in case 3 year olds learn to read
It does keep the forum discussions on track... not bad IMHO..
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Quote from: AJP turbo on January 31, 2017, 10:03:54 AM
Careful....im not sure if you are allowed to say nut hugger on this fine forum...might be too strong of language....im afraid to say the word damn or hell without fear of retribution ...moderators will pounce
Not a bad practice though in case 3 year olds learn to read
(http://i.imgur.com/HHPNxln.gif)
Quote from: ZSHO on January 31, 2017, 04:56:57 PM
Quote from: AJP turbo on January 31, 2017, 10:03:54 AM
Careful....im not sure if you are allowed to say nut hugger on this fine forum...might be too strong of language....im afraid to say the word damn or hell without fear of retribution ...moderators will pounce
Not a bad practice though in case 3 year olds learn to read
(http://i.imgur.com/HHPNxln.gif)
Wait wait wait.... we go from nut huggers to Z asking for a hug? So, is Z a nut? #Askingtherealquestions
Quote from: derfdog15 on January 31, 2017, 05:03:40 PM
Quote from: ZSHO on January 31, 2017, 04:56:57 PM
Quote from: AJP turbo on January 31, 2017, 10:03:54 AM
Careful....im not sure if you are allowed to say nut hugger on this fine forum...might be too strong of language....im afraid to say the word damn or hell without fear of retribution ...moderators will pounce
Not a bad practice though in case 3 year olds learn to read
(http://i.imgur.com/HHPNxln.gif)
Wait wait wait.... we go from nut huggers to Z asking for a hug? So, is Z a nut? #Askingtherealquestions
No nut hugger here but an all out but hugger.lol. Z
(http://i.imgur.com/BomLr7Bh.jpg)