NefMoto

So I bought a bigger aluminum maf housing and am using the original maf sensor.  I cannot for the life of me get my fuel trims and idle to be correct.  I believe I have a halfway decent KRKTE of 3-3.2 depending on what maf settings im using, and the correct tvub values.  Can someone help me out here pleaseeeeeeeeee

870cc injectors at 3 bar, have a 4 bar regulator

Orginal maf housing size= stock 60mm

New maf housing size= 95mm

Attachments

The first file is an original tune for an ATW engine code car (aka the maf sensor I have)

Second is my current tune.

And third is my maf transfer function file, derived from the stock atw file.

Here are the map packs for both files that I've been using.

Forgot to add this, but I have switched from the stock narrowband me7.5 (018P) to a wideband me7.5 (018CH). 

I'm thinking that maybe they have different maf offset values, so I'm currently searching for those maps.  Maybe I have a bad maf sensor? 

Replaced maf sensor with the correct awm version.  Used the scaling program. Still getting lean idle, negative fuel trims under cruise, positive under load.  Also have a kfmirl that is equal to the boost pressure i'm currently running at fuel throttle.

Nobody has ideas?

mmm personally I would get the injectors dialed in first then do the maf? Or maybe you did this already?  I have to tackle the same issue soon enough with 830cc and vr6 maf. Did you look at FKKVS or KFKHFM possibly this is what I was told should be dealt with also with bigger injectors and maf

Yes i'm aware of those maps but I'm unsure which one is the correct fix.  I'm leaning more towards kfkhfm because my intake setup is a bit funky.  Now I'm trying to figure out what to actually log to fine tune my maf readings.

Anyone have input here?

I'm thinking of logging msdk_w (mass air flow over throttle plate), which I believe is a calculated value in the computer, and mshfm_w, the actual measured value.  Then making changes according to how far off they are in mlhfm.  Is this correct?  Or should I leave my mlhfm table normal and make changes in kfkhfm?

Here's a log of a third gear pull almost to readline, I think I've logged enough variables to have something useful.  There's also a graph of what I proposed in the last post.

I'm not sure why I have so many views and only one reply, have I done something to make people mad?

Any advice here would be much appreciated

IMO it is difficult to talk someone through this process.

My advice is to use a logical process and use the maps/parameters as intended.

FKKVS is to correct error at specific on times. This should be below the knee and before the minimum pulsewidth.

Isolate what you are tuning as best as possible.

The more I read the more I kick myself for not doing this.  To set it back to stock my two options are to a. stick the old maf on the new intake tract setup or b. throw the old injectors back in. 

The problem with option a is obviously the intake tract is far far different from stock.  The problem with option b is the stock injectors max out fairly quickly.

So should I stick the stock maf on and hope that it's close enough?

Or run much less boost and try to dial in the new maf housing?

Which is the lesser of two evils?

Nyet made a post but deleted it I guess?  And said to "Compare req to wideband readings".

This graph is what he means correct?

(https://lh3.googleusercontent.com/-rpsLUjrpt90/U-uefRuWIKI/AAAAAAAAGUE/oJ1ulXzmtVA/w1278-h719-no/AFRvsGsec.jpg)

i didn't see that you converted from nb to wideband

in that case, you can simply tune MLHFM by short term trim.

I would do stock injectors and tune MAF for idle and part throttle, then swap in your injectors and tune them at idle/part throttle. Finally, finish tuning the MAF.

I agree. Get the MAF dialed in right first.

Ok that's definitely doable, but how to you guys figure out what changes you need?  Like what percentage to scale by, more than just oh this looks high ill bring it down some.  Using excel and ECUxplot I wasn't able to figure out a way to get my logged values and mlhfm to line up correctly.  Only a polynomial trend line.  Take the derivative possibly? 

I also have matlab but don't have too too much experience with it, besides some basic engineering examples.

Ballpark will be fine. Just do a lot of logging and generate 3d heatmap of load vs rpm vs mean trim to adjust KFKHFM

should be close enough.

If you see a simple linear trend you can fix in MLHFM or KRKTE, do it there first, then relog.

How do you plot the data as a 3d heat map?  I've looked online and no one seems to have any info on it.

I've attached a .csv with a lot of data, and about half way down I have some data pulled to the side which I'm pretty sure is relevant. 

Anyone have a data sheet I could use or something like that?

I made a bunch of custom scripts a while back send it to gnuplot... I assume there is an easier way to do it in excel but i'm no Excel expert :/

I'd love to add it to ECUxPlot but the plotting library I am using doesn't have heatmaps.

Oops replied to the wrong post, and didn't attach anything haha

Hmm stop the presses, maybe I can rig something up

http://stackoverflow.com/questions/10739422/heatmaps-with-jfreechart

So you have these scripts for gnuplot your saying?  I'm open to use any program if I can find one that is...

Ah stackoverflow, used this for my programming class for help but most of the time there functions and explanations are a bit over my head haha

Can't find them anymore... i really need to add it to ecuxplot at some point.

That would be great.  What do you recommend to analyze the data now?  Because most available graphs to me don't really make sense of anything

Any news on this?

And also I can't seem to get my ltft's to turn off.  Not sure how to find NOLRA in my file being that its a single number and also have heard conflicting info on if changing it really does anything in the ME7.5 ecus.  Also have heard to pull the sai relay which I believe I did but this didn't work either, got the check engine light for it but still the ltft's are on.  Ideas/help?

You did a wideband conversion to CH ecu but uploaded your old P file?

I downloaded a stock CH with your SW version from here: http://nefariousmotorsports.com/forum/index.php?topic=5251.msg50026#msg50026

and scaled it, using a-maZers :D tool and your given 60 95 inner diameter.

outcome is the attached file. This file and your stock injectors/stock pressure should give good fuel trims.

The message body was left empty.   ;)

Starting from this you will be able to change your fueling:
what is your stock injector size and fuel pressure?