NefMoto

Hi,
so i finally got a tune that's working well (sort of), but i have an odd issue and i can't tell if it's hardware or my tune.

Problem:
Car runs well in all conditions less than or equal to 15psi of boost.  anything over that (unless i'm going to down hill) i get what feels like a misfire.  THe car feels generalyl like crap, stutters a bit, holds boost well, but feels like it has no power.  It's very strange.  THere is no knock retard, 0 misfire count, and maf reading seems to be ok.

Things i've tried:
-Adding more fuel with tune
-decreasing ignition timing with tune
-took apart cracked coil pack wiring and taped all wires up
-replaced 2 coils.  i also moved them around to see if i got any codes or anything (i didn't)
-disconnected map and drove car -- it ran the same

Ideas/concerns
-I really can't tell what's going on with AFR.  i think maybe ECUxplot is calculating the actual AFR wrong or something?  It shows veyr lean.  I looked at wideband O2 voltage, and i think it's spot on where it should be.  Maybe someone can verify?  is the correct calculator Voltage *2 + 1 ? or is it maybe Voltage * 2 + .96?  not sure what the sensor on this car is.
-bad maf?  i don't think it is as it ran the same when disconnected
-still bad coil wiring -- i don't really buy this.  the updated wiring is only $70 so i might just grab it.. but the swap is kinda a PITA.

Anyway -- i really appreciate any help.  The log is kinda useless, but i attached it anyway.

Tune and XDF are attached for reference.  The attached file might have slightly different LDRXN and KFLDIMX than what was logged, but the car is running exactly the same with this file.

sorry forgot the log

stock FPR still?


I ask because you said you changed fueling around. I took a look and your TVUB looks funny to me. it doesn't show the voltage values for its axis?

I think if it's not software you need to up the fuel pressure to get the injectors out of max DC. you can see in xPlot that @ 5500 rpm the injector DC is maxed out but your AFR is only 16/1 when the BTS map shows AFR should be way lower than that assuming it is being used at the time. Even LAMFA shows AFR should be lower than that so I assume because of the rising lean AFR through the rpm range you are getting high EGT's so the BTS fueling map would be used so that makes matters seem worse. If you've already changed out the restrictive stock FPR for atleast a 4bar OEM unit with this inj DC and AFR, the pump is either worn out or unable to maintain required fuel pressure.

somebody else should look at your WGDC. Is that normal? i guess its just trying to regulate "the taper down" of the boost?
 

Yes, it's still a stock FPR, no i haven't touched TVUB, and yes i saw the max DC issue at 5500rpm, but that's not where i'm having the issue.  It's definitely concerning.  I was under the impression stock fueling hardware could handle a tune like this (this is just a stock engine with stock K03s).  I can certainly dial back the boost a bit at high rpms. What's really odd though is that long before 5500RPM, the afr in xPlot shows it going way lean compared to requested AFR even though inj duty cycle is nowhere near max... I'm really confused as to whether or not i'm logging the right thing there.  The O2 voltage seems to disagree with the graphed AFR.  I'm wondering if maybe i have a bad wideband and that's causing some of this? 

who made this file ?    :o

He will have to read the Wiki over and over again...

Thanks for the useless post. I made it. I'm definitely still learning. Is there something specific you don't like about it?

Can someone please verify if I'm logging the right thing for AFR or not?  If the car really is leaning out as bad as that graph shows, i will start looking at the fuel system.

Useless ? don´t think so... it´s VERY clear: who made (you) will have to read wiki over and over again (becase many concepts were bad undestood or aplied).

Just to begin
KFMIRL too high (requesting much more than turbo can reach)
KFMIOP wrong (raised)
LDRXN to high
LAMFA too much rich in mid range

there are other things that I consider wrong or bad modified...

KFMIRL -- yes, the last axis is much higher than what the turbo can handle.  This will never get touched though, as LDRXN will be used.  Don't see your point here or how this could be affecting my problem.  Unless your saying somehow torque intervention or something is happening (but i don't think that's what's happening)

KFMIOP - definitely not wrong to raise the last row in this map.  The original values are around 82% which was artificially limiting request.  This was proven in a separate thread by myself and another user experiencing what seemed like artificial boost limitations.

LDRXN - might be a bit high in the high RPMs -- i'll give you that, but that's not affecting this problem (which occurs in mid-range when the turbo can actualyl product over 15psi)

LAMFA -- yes, it's too rich.  I kept it incredibly safe to try to rule out all issues with knock retard or anything like that.

NOW -- do you have any ideas related to why this problem might be happening?  Note: this isn't a rate my tune post.

Also, your first post WAS completely useless and offered absolutely 0 helpful information.  Most people on this forum offer a lot of great advice, so i hate seeing posts like that.

You have 1 of 2 things going on. You're misfiring causing a lean condition, or your lean condition is causing misfires. You need to figure that out. Is misfire detection enabled? Check blocks 15 and 16 (just 15 if you have a 4 cylinder) during the run, see if it says ENABLED or not next to the block.

thanks man.  so am i hearing that i AM in fact logging the correct thing for AFR, and it is, in fact, running very lean as soon as boost builds?  Does the O2 voltage seem to match up with the AFR in the graph?  the wideband O2 voltage seems to hover right at 1.5V for almost the entire pull (until the very end where it goes to almost 1.8 -- very lean).  Is 1.5V 13:1 or 12.6:1 -- or is my math way off?

Thanks again!

ok -- so that was very helpful!!! it turns out misfire detection switches on and off when i'm experiencing the problem.  I will research now why this is happening, but maybe you can shed some light on what can disable misfire detection?

either  way -- once i figure out if that lean reading is accurate it will really help point me in teh right direction.  I'm guessing it will probably just need a set of coils and new coil wiring harness.

Thanks again man -- i've said it before, but your info always really helps me!

Need logs!

There is a log in the second post. Should I do another one?  Do u want me to log wether misfire detection is enabled or disabled?

No. Your fuel system is so inadequate it's a miracle you haven't damaged something.

What turbo? What injectors? FPR? Fuel pump? Other supporting mods?

Everything is completely stock. K03s. Just down pipe no cat and FMIC. Sounds like I need a fuel pump or FPR.

I'll do a pressure test tommorow. Thsnks again!

Make sure the line going to your FPR is intact.

Ya, it is, but for about a month after I did the engine swap the vacum line was cracked off. I'm wondering if maybe it somehow got stuck during that time. I guess only real way to tell is a pressure test. I think they call for 58psi at idle with vac connected.

My AWP 1.8t GTI calls for 2.7bar @ idle according to my Bentley repair manual. I did check this a long time ago after I installed a FPG and put the stock FPR back in. The engine idled with the needle @ about 39.5 psi, so prettymuch right on.

If you look at NOTORIOUS VR's log you can see he is even having an issue with fueling using a 4bar reg with stock injectors and pump. He is running less boost but a k04 turbo has been installed. AWP 1.8t in a Jetta GLI http://nefariousmotorsports.com/forum/index.php?action=dlattach;topic=4919.0;attach=7600

well -- good news.  so i pulled teh FPR on a hunch this morning before work and it just so happens the lower o-ring had a tear!  I replaced with one i had laying around and seems to be fixed!! I haven't logged anything yet, but seat of the pants it seems to have worked.  I think i'll still grab a 4 bar FPR which will have the correct o-ring and obviously be a smart upgrade anyway.

I was not rating your tune.... you asked what I dislike in it and I just said.

You can achieve good power and more be more safe with less requested boost, LDRXN and everything I said before... but like I said YOU asked what I didn´t like...

besides the fact fuel here have 25% etanol I can easily reach 215~220cv in these 100% OEM cars making like I said to you...

with 3" downpipe, upgrade exaust, 4bar FPR, inlet and upgraded SMIC I made some cars about 237~240cv.

And with E100 about 250~253cv...

But I see you don´t need my help at all...  good to know you find what was your problem, my best wishes.