NefMoto

Hey guys,

I have been reading and reading for quite some time and I am getting hung up a bit on the first step in tuning ME7.  I am just looking for some guidance, as I'm sure my question is fairly easy to answer for some of the regulars on here.  There are some truly inspiring individuals posting on here and I really appreciate the wealth of knowledge on this forum.

That being said, here goes.  The car:

2002 Audi S4 6MT
JHM RS6-r turbos
ER SMIC's
Siemens Deka 870cc @ stock 4bar (1000cc)
Stock maf (waiting to scale in the injectors prior to installed the 034 85mm maf housing)
034 3" catless downpipes
034 3.5" exhaust system
Innovate LM2 wideband

So, I used the basic KRKTE calculation to arrive at .03397 (34.125/1000) which actually put my STFT's within 2%.  I adjusted TVUB per the injector spec sheet seen here: http://siemensdeka.com/specsheets/FI114992cs.jpg .  Using FNPW_OFFSET * FNPW_OFFCOMP (for 4bar base pressure).  Stock scaling for the stock MAF.

Here is where I am confused, or better yet, this is where I need clarification.  In my logs I am seeing that my desired AFR is very close to my calculated AFR which is what I am looking for per the S4 tuning wiki (if I am interpreting it correct).  The values showing up in the logs DO NOT match the wideband's readings.  The wideband is reading what from my understanding of tuning is correct and the logs are reading on average 2 AFR's richer (wideband reads 11.5, logs read 9.5).  I have ECUxPlot's fueling adjusted to 1000cc injectors, everything else untouched.  Am I aiming to get the logs to match what the wideband is reading?  Do I accomplish this by scaling the MLHFM?  KRKTE? Something else?  OR is this not actually a concern?

Sorry if this is a very trivial and basic concept, I am really trying to get this figured out.

Side note, another pain with this setup is that the wastegates don't seem to follow the normal K03/RS4K04 PID settings for controlling boost so I had to pull KFLDRL way down to a fixed value to control the boost properly.  It's fixed at ~14psi until I get the fueling questions figured out.

Thank you in advance!
Nick

If i am reading this right you are using ECUx plots calculated afr values.  These are not important, you should be looking at your wideband actual AFR, which should be close to what you are requesting.

Regarding PID, yes with RS6 turbos and different wastegate preload the std values will not work.

Rick

Thanks for responding Rick.

My AFR desired is about 1-1.25 AFR richer then actual as measured on the wideband.

I assumed that the RS6 turbo's would be trickier.  I haven't seen any files on here for them to base off of so there will be a learning curve there for me.  At least now I have to boost nice and flat to figure out my fueling.  I'll worry about upping the boost afterwords.

Nick

Start with moderate boost, get fuel trims nice and low, the rest should then fall into place.

First, as Rick said, do not even consider calculated AFR's. The wideband actual AFR is what matters.

I don't really follow what you are saying though.

You said the wideband reads 11.5 AFR but your target AFR is 10 - 10.5? By target AFR you are referring to lamsbg_w?

Is your wideband calibrated correctly?

Why is your target AFR so rich? To avoid lean conditions based on what the wideband is telling you?

How are your LTFT?

Following this as I have RS6-R's too.

Ok, so I will disregard calculated AFR and I know that the actual wideband is all that really matter.

Yes, the wideband reads in the 11.2-11.5 range.  I believe what I'm looking at is lamsbg_w.
I did not calibrate the wideband prior to the runs, wish I had now.

I'm not sure why the target AFR is so rich, to be honest.  Unless for some reason I ecuxplot is scaled incorrectly.

LTFT's are within 2-3%.

Log.

Stop right here. Don't go any further until you know EXACTLY how to set target AFR. If you can't get that right, nothing else you do means a damn thing.

Exactly the reasoning for this post.  I know the car is at a safe AFR to run properly, I just don't know why/how to get the target AFR to match what my wideband is reading.

I am also going to re-calibrate the wideband to make sure that's correct.

*Also, if you're asking about how to set my target AFR, I do get that.  LAMBTS/LAMFA/LAMFAWKR.  These runs, all of them are stock M-box values as I wanted to make sure lamsbg_w matches the wideband readout, and it does not.

To be honest, the very first thing I would do, especially since you're looking to flow as much as 1000cc, is swap out the deka's for Bosch ev14's. I hear nothing but universal praise from people that swap, most saying they wish they had done so sooner.

I run the same Deka's in my 200 and absolutely love them. Granted it's running standalone and not ME7, not sure if its just an ME7 thing.

Run them if you like them, I've just never heard anybody who swaps say anything other than it's the best thing they've ever done.  And it's easier to swap now, before you're dialed in for a specific injector, then to have to do it twice (if you were to decide to swap in the future).  Do whatever you feel best about though, just sharing my opinion :)

I do really appreciate the input man and had I known I would have been better off starting with some EV14's I would have went that route.  If I find that getting them perfect is impossible then I'll think about switching them.  The only reason I went so big is because I plan to run E85 come next summer.

Side note, what does a set of similarly sized EV's run?

Price-wise? Shoot me an email and I can hook you up if you're interested.  I think you'll be surprised that they're not all too spendy.  And I didn't suggest EV14's just because I sell them lol (I wouldn't have even mentioned it if you didn't ask for a price).

Are you serious with that email address ? lol.

I just lost the presidency, let me at least enjoy being an engineer now ;D

BTW, AMD is the best, I actually did have a typo in my email addy, so if you sent one previously, it wouldn't have gotten through.

LMAO..  ;)