OTS 2.05 Stage 2 UEL 91 Map - Need help to understand this log
 

I just got the Open Flash Tablet and loaded it with the latest 2.05 Stage 2 UEL 91 OTS map. This log was created right after I flashed it. I have no idea what I am looking for. From the little that I know, I think it has knock issues. Can someone please comment on this. Also please tell me if my MAF scale looks correct, I did adjust those values to the ones perrin provided

Mods:
JDL UEL Headers
Nameless Catted Downpipe
Ark DT-S Exhaust
Perrin 2.5" Intake with Perrin Inlet hose

*Currently using Shell 91

Any help on this would be appreciated

http://www.datazap.me/u/ssyed/205-st...&data=1-8-9-12

Yes low end maf scale looks off causing high fuel trims -18 once you over 2500rpm it looks ok under load but it a bit hard to see as your not logging throttle

you have enough knock -2.3 or so midrange rpm which is dropping your iam.

to fix the fuel trims your going to have to do your own maf scale see links below.

where your getting knock is not due to fuel trims, i would try some different brands of fuel first, if no joy then its octane booster or you will need to pull some timing out of ignition map see links below.

you should be able to find a different brand of fuel that may help

also do a 2000 rpm to redline run in 3rd and log that

he did a log right after he flashed it. he may need to drive it some for the ecu to learn the new settings. maybe thatll help settle the fuel trims

The ecu learns much quicker than most people think especially where the engine spends most of it time in idle to 3500. after a reset fuel trims are reset , its actually learnt the -18.

I,ll put a dollar down the low end fuel trims wont change much, he has perrin intake as well as intake tube , the maf scaling is off down low or he has a leak intake at maf or downstream or turbulance or exhaust near O2 sensors :D

I have a spacer in the secondary o2 sensor to avoid CEL before I got the tune. Could that be causing it? Do I need to remove it?

I'll adjust my maf scaling tonight as well. Thank you guys so much for helping me out here

The LTFT's are huge, and interestingly... all negative. Something is causing the sensor to read rich. Is it possible this is all caused by the intake? Those trims are big enough it seems something else might be at play, some kind of leak. but I've never personally analyzed what kind of fuel trim deltas you can get due to different intakes.

I've checked multiple times for leaks. However, I can check again if there is a leak at the header connection to the nameless pipe. I know for sure there is no leak anywhere else.

If there was a leak before the O2 sensor I'd think you be getting positive fuel trim as it should be leaning out the o2 reading during idle and low rpm operation. Doesn't hurt to check all the connections intake/exhaust and that the o2 sensors are torqued down properly.

I donr believe the second O2 sensor will cause fuel trim issues, that the primary sensor before the cat that used for fueling. The secondary one is for cat efficiency monitoring and probably some other functions. I just read that rear 02 is used for closed loop fueling in conjunction with the front sensor so it might be worth removing the O2 spacer just in case, but its doubtfull it will be the issue

agree with @solidONE re fuel trims usually go positive with exhaust leak as it get fresh air in between exhaust pulses near O2 sensor then ecu adds fuel.

hopefully its just maf scaling, but check the gasket at maf sensor is not creased or damaged if you run an oiled filter might be woth cleaning maf sensor with maf cleaner solvent.

I would still remove the spacer on the rear O2, and just disable the CEL through RomRaider.

As for the MAF scale, why did you use the Perrin provided scale? That's for the 3" big MAF intake, not the 2.5". The 2.5" shouldn't need the MAF rescaled to be close.

I don't know, I just thought it would be a good idea. Anyway, I just flashed the unscaled version of the map and nothing seems different. Well except for the fact that I have a solid 1 for Adv. Multiplier, hopefully no knocks? I did fill it up with different gas

I logged the car again with more values. I tried scaling the MAF, but I just dont get it lol. jeez I've spent 5 hours trying to figure it out still no avail

heres the most recent log with just the Stage 2 UEL 91 Flash with no maf scaling

http://www.datazap.me/u/ssyed/205-st...g=0&data=1-6-7

Dude... did you forget to plug in your MAF sensor? Go check it right now 'cause your maf voltage is flatline in that log.

Although in your first log, the MAF looked fine... How does it idle? rough?

There is provided scales for both 3" and 2.75" they are attached to end of "MAF SCALING" thread links below. Correct you would not want to use the 3" scale on the 2.75" intake :D

direct link here
http://www.ft86club.com/forums/showthread.php?t=64790

It might be worth just running the tune with the standard maf scale supplied in tune and see what that looks like.

If you were running the 3" maf scale definitly change to the 2.75 version supplied by perrin see end of this post

http://www.ft86club.com/forums/showthread.php?t=64790

If that no good try using the scale that comes with tune.

Did you use the "VGI MAF Scale Utility" to scale MAF (don't use Yikes it will do your head in at first)