Pages: [1]
Author Topic: Help me get LTFT right, ME7.5.10  (Read 392 times)
markus2900
Newbie
*

Karma: +0/-0
Offline Offline

Posts: 10



« on: September 11, 2025, 09:32:16 AM »

Hello, I recently started a project on my VW Golf 1.4 16v BCA, where i changed the intake, changed injectors for bigger ones and now i'm trying to scale KRTKE and TVUB right but i can't seem to zero out.

Biggest problem is i can't find any values on these injectors online. I only know something about the old ones, just not much about the new... - big problem.
What I changed:
KRKTE - original 0.1963 - to 0.1280

TVUB original 6,97   8,026   9,997   11,968   14,01 V
                    2,0864   1,5072   0,9184   0,608   0,4096 ms
NEW VALUES  3,1617  2,2840     1,3917     0,9214     0,6207 ms
TEMIN 0.4992 to 0.3296

All these values were based off a calculation i did with a spreadsheet for calculating KRKTE.. I tried it with stock TVUB and with the TVUB suggested by the spreadsheet  - i have to because i can't get TVUB of the bigger injectors.

The injectors i had in my car 036906031G - they are magnetti marelli IWP... a bosch equivalent has 90g/min - which would be around 125cc/min - KVB in my XDF file says 131cc/min tho.
I put in injectors from 1.6 16v 036906031T - also magnetti and bosch equivalent of these has 137g/min - which would be 190.3cc/min
So i scaled everything off these values. And what i got is 5%+ LTFT with rough idle - sounds like it's too rich on idle.
Someone suggested here that i should try KRKTE 0.1643 which apparently works well with stock tvub.. well that got me -14% LTFT and very very bad idle.. so i tried with a calculator.

Unfortunately due to my ECU having like 6 definitions in ME7Logger i can't basically log anything using it. So I'm stuck using VCDS logging. - I was thinking if theres a way to extract locations to me7logger from the VCDS label file.

I'm kind of stuck at this because i don't know if i should scale TVUB or KRKTE, or something else.
Also - the change wasnt done on the stock file. Because my car already has a stage1 - faster throttle body responce and only slight changes to lamfa, kfzwop, kflbts etc.. but these changes are in a 2-3% margin and i don't think they are the culprit of affecting my LFTF - BUT IM NOT SURE.
During the intake swap i had to change to a magnetti marelli MAP sensor instead of bosch one i had but they should show the same values. they are for the same car. I noticed tho one maxxes out on 980mbar and one on 950mbar.. MY CAR DOESNT HAVE MAF.

Can i get some suggestions... you can yell at me how badly i did this or what i am doing wrong.... i'm still trying to learn tunes on NA engines. Thanks for anything.
I will attach my log file of group 032, 033 and 02.
Also some other log files if i find.


Logged
markus2900
Newbie
*

Karma: +0/-0
Offline Offline

Posts: 10



« Reply #1 on: September 11, 2025, 12:00:57 PM »

I did some more logging now with little higher krkte. LTFT dropped to -1,6% after 50km.
Logged
Pages: [1]
  Print  
 
Jump to:  

Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Page created in 0.011 seconds with 14 queries. (Pretty URLs adds 0s, 0q)