NefMoto

Has anyone calibrated these injectors?
(http://www.boschdealer.com/specsheets/0280155968cs.jpg)

KRKTE: 0.075
TVUB: 2,1203   1,3335   0,9254   0,6748   0,4907 (using 3 bar fpr)
fkkvs,kflf, kfkhfm lets say stock or ones prior fine tuning.


Do i miss something or looks ok?

BUMP  ;D

They are not linear, fkkvs will need a lot of work.

Flow for me has been 450cc at 3 bar.

Ok prj i will focus on that. Thanks.

noob question ,but if FKKVS is correctly tuned ,why whould KFKHFM needs to be corrected if we have no changes in MAF ?

KFKHFM is for tuning the MAF.
If you change the intake for example and the airflow readings go off.

Yes I understand and I know that. I am asking because the OP mentioned about tuning KFKHFM to an injection rescaling thread so I thought I was missing somethinf :)

Back again.
Trimming FKKVS a lot, krkte and tvub (12 & 14v) manage to get ltfts/stfts close to -2.
But i see weird behavior on idle.
B_tabgbts is always active although the trigger is over 700°c.

FRM_W close to 1 with 1-2% variations, but on idle goes to~0.92 and lambda readings on Vcds are -15 to -20. Maf goes from 2.5-5.5gr/s and 680-880rpms and ofc ignition retard.
Wot and cruising all fine.
Cant say for leaks atm, although it mirrors such issue.
From SW perspective where do i look now?
temin stock. Kfkhfm stock with 0.93 on idling rpms.
Was thinking to lower tvub 12v value perhaps kflf or kfkhfm too.
Your suggestions pls.

You should not touch kflf nor kfkhfm for injectors ever.

What would kflf be used for in this case?

IMO KFLF is just a relic left over from old times. It has no use in ME7.

Ever looked at KFLF in RS4 K-box?

Have you ever looked at KFKHFM on RS4 K-box?

There are plenty of examples where KFLF is used in OEM applications.
In the end the ECU is just a calculator, garbage in, garbage out.

Does not change the fact that it is a relic from old times when the ECU did not have a strong concept of fuel request - only correction maps.

same ones I used in my v8 supercharger conversion all I changed was tvub and krkte fuel trims normal..... didnt touch anything else

http://nefariousmotorsports.com/forum/index.php?topic=3469.msg38763#msg38763

I see. Was sceptical of touching those maps for injector calibration, but this issue is bizzare and was looking for bizzare solution.
On the other side, touching only krkte and tvub gave me paranormal fuel trims but stable idle.
Touching the FKKVS as was looking for +2 - -2% fuel trims, and now i ve got this idle issue only.
Perhaps the TVUB is bit high (0.94 12v - 0.75 14v) or air leak are what i can think atm.

Tuning the car without pressure testing is a waste of time.
If you are sure your TVUB is correct, then rescale axis on FKKVS to allocate more sites to the problem areas.
Remember that input to fkkvs is te, not ti.

You should be able to have sub 2% fuel trims if everything is linearized correctly.
Usually I just do a ton of logging with different loads, and then plot the lambda correction against the FKKVS map as a matrix.

Necrobump.

I've been having fun with these lately as well. Firstly, I tried modifying my TVUB according to the spec sheet (http://i226.photobucket.com/albums/dd202/airtite/0280155968cs_zps3134ae0a.jpg). Idle STFTs went to ~-25%. That didn't look right (KRKTE is more or less correct), so I went to read around and found out that there are multiple reports about these injectors being highly non-linear. But since they come stock on some ME7-equipped volvos, I decided to just look at stock volvo TVUB first.

One of those volvos is S60R with B5254T4 engine. Its "working" fuel pressure is also 4 bar, which is perfect for my application. Here (http://nefariousmotorsports.com/forum/index.php?topic=4530.0) are stock bins, for example (thanks, guitar24t (http://nefariousmotorsports.com/forum/index.php?action=profile;u=5332)!) I took the bin from the first post, for AT car, and started looking.

Found TVUB at 0x23790, confirmed by disassembly. Factor for voltage looks funny (0.01 vs 0.0704 for audis), but here's the data:

8V	1.8144
10V	1.2
12V	0.7648
14V	0.4992
16V	0.3808

I used 0.032 as a factor for latency itself, it appears correct for the CPU used.
Also, a good "sanity check" for latency factor is "ms" axis in FKKVS map. It uses the same one and if the axis looks funny - your factor is most likely wrong.

Anyway, FKKVS is at 0x23520. I won't post it here, but it's not THAT non-linear and ranges from -2% to +6% across the board.

EDIT:
These TVUB values along with correct KRKTE (0.07448 for 4.2 V8 engine - this will be different for other displacement and/or cylinder amount!) and completely flat (1.000) FKKVS brought me -1 to -1.5% idle and spot on ( 0 to -0.8 ) cruse LTFTs. Therefore, TVUB for these injectors seems to be completely different from the data circulating around on that spec sheet.

Remember the Volvo uses a DECOS fuel system ;)

Hello ! had the same problem with the nozzles, there is already someone who has set them?
values are now! pours gasoline.

I bought those injectors and couldn't find the right specs for them. Right now Im calculating the krkte for 450cc flow, krkte 0.07271 (stock krkte is 0.10301 for 1.8T AUQ 317cc).
I got close to zero on idle trim and ltft, but the numbers keep changing as I run with it, but always stay under -7% and zero for both.
can someone confirm the right flow and tvub for them?

These injectors are not linear in response at middle pulsewidths.
They will need quite significant adjustments in fkkvs compared to EV14's, which are super easy.

thank you for your reply!
would the fkkvs be different for each setup (different cars) or just based on the injectors non linearity?

Yes.

can you confirm the right tvub table for them? I managed to get idle and ltft pretty close to zero on e100, but with stock tvub. I couldn't find the right tvub for them.

could someone please confirm the right tvub for those injectors? need to figure that out first in order to start fixing fkkvs. would be great if someone can tell the right tvub table for them.

I think I posted the stock Volvo TVUB for these injectors a few posts ago?

I thought since was told that volvos use a DECOS fuel system and the factor for the tvub was different to the audi one, that those values were wrong for our use. Am I right?

No.

Here you go.

is this one right? 0280155"8"68 instead of 0280155"9"68? also I read here that those spec sheets are way of. Im sorry if I may sound ironic or complaining, just want to point it out.

Just try the parameters I listed above. They worked perfectly for me. Along with correct KRKTE and 4 bar FPR, my trims were almost spot-on after a couple of FKKVS fixer passes.