NefMoto

Been working on a tune for some time now and I'm trying to work out a fueling issue in the higher rpms.  As you can see in the graph below, suddenly around 4200 rpm, the ecu begins dumping fuel.  The desired AFR even drops so low that it bottoms out the actual AFR.  Can anyone provide some assistance with troubleshooting this problem with me?

I haven't toyed too much with the fueling yet other than KRKTE, which I've zero'd out my trims with.  But I've borrowed the following maps from the TT225 since I'm running TT225 injectors (Bosch 386cc) and the TT225 MAF:
-TVUB
-MLHFM
-KFMLDMN
-KFKHFM
-FKKVS

Hardware:
K04-001 turbo
TT225 MAF
TT225 386cc injectors
Eurojet 'race' FMIC
Forge 007 Diverter Valve
2.5" Magnaflow DP+Catback Exhaust
N249 Delete
SAI Delete

(http://i.imgur.com/4ymDF.png)

Also attached my WinOLS file.

I dont see egt's logged maybe egts are exceeding 950degreeC and the ecu is dumping fuel too cool egt's?

your fueling is completly wrong like I said here .

->http://nefariousmotorsports.com/forum/index.php?topic=1272.msg11967#msg11967 (http://nefariousmotorsports.com/forum/index.php?topic=1272.msg11967#msg11967)

Correct me if I'm wrong, but the VW 1.8T does not carry any EGT sensors.  Are we somehow substituting real EGT information using the rear O2 cat temperature?

My LAMFA is stock.  I expected to tweak it a bit, but I'm trying to understand the cause of the sharp drop into rich territory before I do so.

EGT for BTS is modeled, not actual reading from EGT sensor. What do your BTS tables look like? How are your CF's?

I believe all of my BTS maps are untouched, stock.  Are there any particular ones I should focus on first?  I am going to read up on this in the funktionsrahmen.

Now that you mention CF's... they're rather high. -3, -6, -3, -8.25  and then they lowered to -2.25, -5.25, -5.25, -6.75 after the richness kicked in.  Next on my list was to tune KFZW and KFZW2, however, I'm surprised to see that under the stock timing map, I would still see high CFs.  I was under the impression that the stock timing map was pretty conservative.

http://s4wiki.com/wiki/Tuning#Fueling

:P

Yup.  I think I know that section of your wiki by heart now.  I think only now it's starting to make a little sense.  Sorry, I'm a bit of a fueling newbie at the moment.

Here's the same log, but also including CFs.  Looks like it's possible that the CFs are causing BTS to correct fueling.  What table controls this?

(http://i.imgur.com/uIcQl.png)

[KF]DLBTS and KFFDLBTS

IMO you should prevent the real issue by getting your CF's in check instead adjusting these maps.

It sounds like you have alot of work to do regarding fueling and timing.

How much load are you running?  I'm assuming its considerably higher than stock.  If that is the case then the load axis on the stock timing map only goes up to say 140% load.  If you don't modify the timing maps then you're trying to use the same ign advance at all loads greater than 140%.  The stock value at 140% load, 4500 rpm is too high for 190% load 4500 rpm unless you've got awesome fuel.

You're absolutely right.  I just set up a new KFZW(2) with a taller load axis and configured the values appropriately.  I'll log this on the way to work in the morning.  Hope there's no traffic for my 3rd gear pull. :)

any chance you can post what your modified KFZW looks like?

It's essentially the KFZW(2) from the TT225.  I'm using this as a starting point since my engine is fairly identical at this point.  The load axis goes up to 185.

8N0906018CB

You will have to start from scratch as the CR on the AMK/BAM engines is lower than the AUQ and can cope with higher advance and boost.  Your best bet is log your timing, CF, rpm and load and work on the stock timing maps and pull the advance out where its pulling and add it where you needed it.  a quick way to see what going on and to get and idea of how much timning you need to pull out is via unisettings/lemmiwinks.

Its hard to run a lot of timimg from the k04-001 with stock manifold, you really need to port the collector and runner number 3 to help with flow first.

Your fine running the stock maf with just KTKTE corrected.

With WMI, ported exhaust manifold, forge actuator with blue spring and the compressor wheel from the k04-023 the k04-001 will flow enough for 290bhp, I ran this set up with 75hp of nos and managed a 12.5s at santa pod last summer.

I also fitted the K03s cold side to the 001 and managed 275bhp 334lbft.. ;)

The k04-001 maxed out will flow 213gs around 265bhp 13.89s 1/4 mile, but you need to have the timing bang on and the exhaust flow the best you can

Thanks.  This is really useful information.  Where did you source your parts (ie. the compressor wheel and cold side)?

Alright, so I got my CFs under control by building a reasonable KFZW(2).  I also tweaked LAMFA at 100% driver request to produce an AFR in the 12's.

As you can see, I am still experiencing the same problem, but the sharp drop into rich territory is happening much later in the band.

Is there any way I can tell what criteria is causing BTS engagement, or perhaps which BTS map to look at?  I logged my cat temps, which seem to range from 550 to 700 degC.  Unfortunately I'm still trying to locate TABGBTS in my file. 

(http://i.imgur.com/Bu0tr.png)

Have you modified KFLBTS? IIRC it is extremely rich up top.

I have not.  But if I understand correctly, a BTS table is engaged for component protection.  Wouldn't the switch from LAMFA to KFLBTS indicate that something is exceeding a threshold?  And if so, wouldn't leaning out KFLBTS basically undermine the correction that was intended?  I am fully open to the fact that I could be looking at this wrong.

I think I'm coming to the realization that I really need to locate TABGBTS in my definition.  I have been able to find hundreds of maps, but this one eludes me.  It is not relative to it's location in similar 06A 1.8T ECUs.

In ME7.1 Lambda will follow kflbts when ATM exceeds 500* c and lambts is the richest input. This is well below a critical temperature and there is no reason for it to enrich beyond 0.8 IMO.

Do you have ATR (EGT sensors)?

I have not lowered TABGBTS and don't think it is necessary of you are using lambts to supplement lamfa.

Agreed. If LAMFA is generally providing your lambda target, dont mess with the BTS threshold

Thanks guys.  Modified KFLBTS as follows and I'm going to take it for a whirl on the way home from work.

(http://i.imgur.com/FojFM.png)

Personally, I like to enrich beyond LAMFA earlier to run more advanced timing.

Ahh.. so much better.  Thanks a lot for the guidance, fellas.

(http://i.imgur.com/ngN87.png)

How soon do you reach full enrichment?  Right before full boost?  By full enrichment, I mean the richest value throughout the pull.