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Title: high LTFT after injectors changed Post by: tao13 on March 11, 2018, 11:36:30 AM Hi all.
I have a 1.8t AUQ with stage 1. I changed injectors with bigger from audi tt 1.8t 225hp with k04-023. I made this because in few days will put on my car the k04-023 but first i went to know if car works ok with new injectors. I made maps modification in my file on with audi tt values in : KRKTE TVUB TEMIN KVB After these my car starts ok , but LTFT is higher in few minutes after start (with old injectors after 5 month from stage 1 was -8.5 and now is -11.8) and the car lose some power it is not agresive like in the past it works more smoth.Lambda works ok between 13-15 and AFR is 0.8-1 What can be? Must mofidy KRKTE? THANKS Title: Re: high LTFT after injectors changed Post by: corradovolksb on March 11, 2018, 01:39:42 PM Since you copied the values from 225tt file to Krkte, tvub, temin, kvb that’s good but also make sure to copy over fkkvs. The other thing that will affect ltft is a slight boost leak so make sure to pressure test you system. A dirty maf will also affect your trims.
Sent from my iPhone using Tapatalk Title: Re: high LTFT after injectors changed Post by: gt-innovation on March 11, 2018, 01:49:49 PM Hi all. I have a 1.8t AUQ with stage 1. I changed injectors with bigger from audi tt 1.8t 225hp with k04-023. I made this because in few days will put on my car the k04-023 but first i went to know if car works ok with new injectors. I made maps modification in my file on with audi tt values in : KRKTE TVUB TEMIN KVB After these my car starts ok , but LTFT is higher in few minutes after start (with old injectors after 5 month from stage 1 was -8.5 and now is -11.8) and the car lose some power it is not agresive like in the past it works more smoth.Lambda works ok between 13-15 and AFR is 0.8-1 What can be? Must mofidy KRKTE? THANKS Do not Just copy FKKVS. Tune it properly with datalogs. You can also find the fkkvs fixer script here .Make sure that your maf and lambda sensors are healthy. Title: Re: high LTFT after injectors changed Post by: corradovolksb on March 11, 2018, 02:14:34 PM Yah good call using fkkvs fixer
Sent from my iPhone using Tapatalk Title: Re: high LTFT after injectors changed Post by: tao13 on March 12, 2018, 12:24:45 AM Thanks. SO is better to use fixer on copied fkkvs or mine?I dont changed the Maf it is 70mm maf from my auq.
the krkte is from audii file but i think it is calculated for MAF 80mm. Correct? So i must modify the krkte value too? About fkkvs fixer i mult log only 3 variables: nmot_w,te_w,fr_w and nolra=7? How long time and in witch gear must i make the logs? Many thanks again Title: Re: high LTFT after injectors changed Post by: KasperH on March 12, 2018, 09:08:47 PM KRKTE should stay the same if MAF is calibrated correctly.
Meaning that KRKTE shouldn't change if you scaled for a bigger MAF on the same injectors. Title: Re: high LTFT after injectors changed Post by: tao13 on March 12, 2018, 10:18:45 PM Understand this for the next modification with bigger maf.
But no i have my little maf 70mm from AUQ but injectors are from BAM and the krkte has value from BAM file , and i think the krkte is calculated for bigger maf and bigger injectors! Correct? Title: Re: high LTFT after injectors changed Post by: tao13 on March 23, 2018, 12:55:24 PM After 500km LTFT stopped to maximum -11.7.
I have a big problem with cold start with this big injectors. In the night was -10 degree and when i try to start the car was -2 degree. First key try car turn one tour and stop without sound to burn fuel. Second key car turn one tour and stop without sound to burn fuel. Waiting 5 seconds and tried 3rd and car start but few seconds not good running. Can you tell me if i must modify some maps for cold start because i don't think it is necessary if i calibrate the new injectors in software. Many thanks in advance. Title: Re: high LTFT after injectors changed Post by: nyet on March 23, 2018, 04:07:12 PM After 500km LTFT stopped to maximum -11.7. You either screwed something up or you have a leak. Quote Understand this for the next modification with bigger maf. But no i have my little maf 70mm from AUQ but injectors are from BAM and the krkte has value from BAM file , and i think the krkte is calculated for bigger maf and bigger injectors! Correct? krkte is injector dependent only, not MAF. MLHFM and KFKHFM are for MAF. Please reread the wiki. Title: Re: high LTFT after injectors changed Post by: tao13 on May 05, 2018, 12:32:15 AM Hi all
From 2 day i changed next items 1. replace k03s with K04-023 2. bigger MAF from audi tt engine code BAM ( bam injectors was mounted 3 month ago and was calibrated with maps). 3. wastegate kinugawa with 0.8bars spring and with 3 compleate turn adjustment (aprioximatly 2mm). I left my old stage 1 file who works ok before except LTFT. I changed my old stage 1 file with BAM maps : FKKVS - from bam and the ltft stay maximum -3.1 KFLDHBN - LDR altitude limitation (maximum pressure ratio) MLHFM - Linearization of MAF voltage MLOFS - Linearization of MAF voltage minus MLOFS KFMLDMN - ML: threshod for B_minflr diagnosis HFM/HLM MLMAX - Maximaler Luftfluß für die Lastberechnung nach SAE J1979 KFMLDMX - ML: threshold for B_maxflr diagnosis HFM/HLM KFKHFM - Correction map for MAF Car start and works ok but if i want to run after 3000 rpm it make higher boost 1.4-1.5 bars I made a log in 3rd gear (maybe log started with 2 gear ). PLEASE waiting your advice. Many thanks in advance. Title: Re: high LTFT after injectors changed Post by: KasperH on May 05, 2018, 06:04:45 AM Did you change any of the boost PID maps?
Title: Re: high LTFT after injectors changed Post by: tao13 on May 05, 2018, 08:20:15 AM NO
must i change it? if the answer is yes how must i change? i read this forum many times and the wiki too but i don't know what must i change from now with bigger turbo Title: Re: high LTFT after injectors changed Post by: KasperH on May 05, 2018, 08:34:35 AM You can't just slap a different turbo on and expect the ECU to know what to do with it, it only knows what to do with stock turbo on stock wastegate.
You need to calibrate boost PID to account for bigger turbo and stronger actuator. Ways to do that is also found on this forum. Title: Re: high LTFT after injectors changed Post by: nyet on May 05, 2018, 09:58:45 AM He ALSO needs to work out his LTFT issues.
Something is clearly amiss if he's hitting the trim limit (regardless of the fact that he didn't bother to tune for different turbos and wastegates).. The whole thing is kind of a mess right now. Title: Re: high LTFT after injectors changed Post by: tao13 on May 05, 2018, 01:28:30 PM NYET , sorry but now the LTFT WORKS GREATE NOW with FKKVS adjusted.
I have -0.8 after 300km. I think it is ok right now.Before with stage 1 and bigger injectors the ltft works bad with -11 -> 14 but now i ok. |