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!
Looking at AFR numbers
- Thread starter Shmike281
- Start date
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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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)...
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!
Typically you should expect to see somewhere between .82-.87 once tuned for your lambda target.
Post a log up!
derfdog15 said:
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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StealBlueSho said:
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!
Looks like mine if I were to do a second gear only pull.
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AJP turbo said:
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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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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