Commanded AFR unusually high.... Log and File Inside

[Texas_AT]

C6Z, built ls7, turbo, cam. 2 bar custom OS (maf less) car was brought here after being built/tuned elsewhere. THIS IS NOT MY TUNE.

It's got some rough afr swings, looks like ltft's are disabled, and it has a bad o2 sensor. I replaced the bad O2 and it immediately straightened out some of the issues and steadied both sides. Car makes okay power, but it can definitly use some VE tuning. Has a permanently installed wideband in the car, disabled closed loop, and reset fuel trims, hooked up and started scanning. My VE errors are 50+ % off. I have the scanner and histrograms setup correctly, labels are correct, etc. The car seems to be commanding 18+ afr all the time.

Wonder if this is super scaled

[Texas_AT]

Log is just a short quickie

[Bill@HPTuners]

YOu might consider taking a look at the stoich AFR table

[Texas_AT]

YOu might consider taking a look at the stoich AFR table

lol see, told you something silly. I spent about 10 minutes looking at this tune, made a quickie log and went home. I actually just saw their injector settings. I know it has siemens deka 80 lb injectors, but the values look completely wrong.... I'm going to just start over clean.... I dont have a stock file from this car to start from. Also just saw the timing tables steps, ouch, like a cliff 1200+ For what this car is, it's not very responsive down low. With the stoich table set that high, I dont even know how it's idling as is... With it not having a flex fuel sensor at e5-10 at the pump I suppose a 14.4 value across the board would be okay, correct the injector settings, correct the timing maps, and get the ve nailed down.

*edit* Upon further investigation, it looks like they tried to make it happen with a maf and had the whole tune scaled at one time. Than gave up and went custom OS.

[Texas_AT]

Also appears PE is disabled with the enable at 256 KPA. And all enrichment was being done in the VE table. Awesome
EQ Ratio and BE Ratio was all zero'd out, I knocked it up to 1.33 to just get started.

[Texas_AT]

a/c settings are whacky, disables at 200% throttle, and according to datalog, max throttle is 98%. , I feel better about really making this guy happy. He also "thought" it never drove correctly.

[2xLS1]

YOu might consider taking a look at the stoich AFR table

Didn't look at the tune but maybe they did this.


http://www.hptuners.com/forum/showthread.php?t=37766

[Texas_AT]

Didn't look at the tune but maybe they did this.


http://www.hptuners.com/forum/showthread.php?t=37766

haha, same car. That must be the old tuner, and looking at his past posts, looks like he learned how to tune an e38 here a couple months ago, on this car

[Bill@HPTuners]

Didn't look at the tune but maybe they did this.


http://www.hptuners.com/forum/showthread.php?t=37766

Thanks, When it comes to questions about weird afr readings the first thing I look at is the scanner log which in this case I could see the 28:1 afr being commanded, made me scratch my head for a sec so I looked at the pe table in the tune file, nothing looked wacky there so directly to the stoich table next where I did one of these

I didn't even get into it any further than that ie IFR, etc.

[DSteck]

FYI, the AC settings are stock.



Doubling the stoich AFR and cutting injector flow rate in half is a common and easy way to scale for large injectors that surpass the injector flow rate limit.