for that method you must go through couple of cycles of adjusting long term low range and high range LTFTs followed by TVUB to get idle in checks.

Then repeat it.

The problem is that TVUB affects idle the most but it also is a natural component of injection time for any load range albeit the longer the injector is open (higher load and maf flow), the less % wise TVUB affects it.

At idle, if the injector has to open for 0.5ms with TVUB of 0.7ms, the tvub is actually larger then required pulse width of injector to reac proper mixture. If TVUB is off by 10%, it will inbalance the mixture by 0.7/0.5 = 1.4, which gives 1.4 * 10% = 14% off the proper mixture.

At higher load when the injector needs to open for 10ms, the total open time wold be 10 + 0.7 = 10.7 which gives 0.7/10 = 0.07, which gives 0.07 * 10% = 0.7% off the proper mixture.

That's why you want to get the KRKTE by riding the car hard and once you have KRTE honed down to within couple of %, you switch you attention to idle and use tony's method. Eventually you will get it right however not the way you think.

You don't add just 0.01ms across the board since adding 0.01 to 0.01 means upping it 100% while adding 0.01 to 1.00 means upping it 1%.

Instead, you need to divide intended bump (0.01 in your case) by the TVUB value at the voltage you normally operate (14v or so) and get what part of the injection time it is in % at that voltage.

For example, you want to add 0.01 to say value 3 from your example.

0.01 / 3 = 0.00333

Now you want to multiply each TVUB value by 1.000333 and you will get TVUB scaled up by 0.000333 across all value EVENLY.

To properly interpolate TVUB you need to have reliable TVUB specs from injector manufacturer. And remember, TVUB values are always given for 3bar of fule pressure. Audis usually run 4bar FPR which means the injector needs to overcome more resistance and its TVUB needs to be multiplied by some value, usually ~16% for 3 to 4 bar bump but it might vary.

I hope I didn't bore you to death.

Are these the values you used

6 = 5.202
8= 2.184
10= 1.435
11= 1.210
12= 1.041
13= 0.907
14= 0.789
15= 0.699

I've got a question, looking for some verification on units from the example in the OP.  So KRKTE is in (ms/%), and you're multiplying it by the idle LTFT (in %) to come up with a value in ms.  In the example in the OP, KRKTE was 1.0 and LTFT idle was -1%. Is it correct to multiply 1.0 * (1), or 1.0 * (.01) to come up with the value?  Examples I've seen in other threads show the former, but the example here in the OP shows the latter, so I'm a little confused on the proper units (they're both technically the percentage).

I missed out on the latin lesson when my engineering professors talked about percentages

I understand that in general, what threw me off, or rather made me question it, is the "dynamic_krkte_tvub" calculator excel spreadsheet in the other thread I just bumped.  If you look at cell E18, for example, it is multiplying the fuel trims in full percentage form (ie multiplying KRKTE by one percent by literally taking the KRKTE*(1)).  There's conflicting info, and I am just trying to figure out which is correct.  With load being units of percentage as well, I thought maybe there was some funky units thing going on for the calculations inside ME7.  Thanks for the clarification

that spreadsheet i coded desperately needs repair.  no debate from me, i promise.
please give me any calculation corrections and i'll repair it.

Hi everyone,

have few doubts regarding LTFT & STFT.

Is LTFT = fra_w (multiplicative)
   STFT = rka_w (additive)

Leave TVUB alone. 1.3 percent is within the acceptable range of deviation.