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Title: How to fix high short term fuel trim under boost. Post by: bombis on March 21, 2024, 07:55:08 AM Bosch 550cc, garrett gt28rs
Hi. This is my first modded bin. Adjusted krkte(fuel) up 3% and kfkhfm(maf correction) to 1 Made a logfile, see new post Title: Re: AFR current higher than requested Post by: _nameless on March 21, 2024, 08:28:27 AM EngineSpeed BoostPressureActual LambdaControlAvg AirFuelRatioDesired AirFuelRatioCurrent Here we go again............. No data logs, and posted in the wrong section. Running that lean you will melt something quick, I wouldn't continue to hammer on it. Now that I got that out of the way...... It could be a million things from poorly calibrated injectors, shitty quality fake china knock off injectors that will lockup with a rising rate fuel system, plugged fuel filter, weak fuel pump would be my starting point. Changing calibrations before vetting hardware is never a good idea. 3360 2208.55 1.02301 0.825929 0.983644 3440 2247.34 1.12677 0.829347 0.897706 PartNumber = 4B0906018DC Bosch 550cc, garret gt28rs Hi. This is my first modded bin. I can see current AFR is highter than requested afr. Do i need to adjust some maps to make them more similar? Title: Re: AFR current higher than requested Post by: bombis on March 21, 2024, 09:49:37 AM . Title: Re: AFR current higher than requested Post by: bombis on March 21, 2024, 11:20:10 AM Here we go again............. No data logs, and posted in the wrong section. Running that lean you will melt something quick, I wouldn't continue to hammer on it. Now that I got that out of the way...... It could be a million things from poorly calibrated injectors, shitty quality fake china knock off injectors that will lockup with a rising rate fuel system, plugged fuel filter, weak fuel pump would be my starting point. Changing calibrations before vetting hardware is never a good idea. Got brand new Bosch 550cc original injectorsFuel filter 2-3 years old Walbro gss 341 fuelpump Original atw fuel pressure regulator wideband lambda from innovate LC-1. Not sure if its ok to use this one temporary i vent DV to atm krkte 0.05153 KFKHFM original; idle 1.01, hi rpm 1.08 I want to set this map to 1. Thats richer right? And/Or set krkte highter Title: Re: AFR current higher than requested Post by: bombis on March 22, 2024, 04:56:01 AM short term fuel trim looks ok with low boost
Title: Re: Updated bin with logfile Post by: bombis on March 22, 2024, 11:28:50 AM Frm_w short term fuel trim, gets high under boost.
How to adjust? Title: Re: How to fix high short term fuel trim under boost. Post by: James1 on March 22, 2024, 01:32:25 PM You need to add more fuel in that area - what determines the amount of fuel injected, and what corrects it? These are very basic fundamentals, you must know them before you can start tuning.
Title: Re: How to fix high short term fuel trim under boost. Post by: bombis on March 22, 2024, 02:24:23 PM You need to add more fuel in that area - what determines the amount of fuel injected, and what corrects it? These are very basic fundamentals, you must know them before you can start tuning. KRKTE is very important. This will add fuel everywhere, but i only want it on hi rpm/load i havent tried KFLF, but I will try tomorrow :) Title: Re: How to fix high short term fuel trim under boost. Post by: prj on March 22, 2024, 02:30:03 PM I only know KFKHFM for adjustments within a range. Is that ok, or do you have other maps in mind? KFKHFM adjusts load not fuel. Start by reading the wiki instead of posting. Title: Re: How to fix high short term fuel trim under boost. Post by: Jozua on March 23, 2024, 12:00:51 AM Also had similar problem arent you burning some oil how oil consumption
Title: Re: How to fix high short term fuel trim under boost. Post by: bombis on March 23, 2024, 08:56:44 AM Also had similar problem arent you burning some oil how oil consumption Haven't noticed any oil consumptionTitle: Re: How to fix high short term fuel trim under boost. Post by: bombis on March 23, 2024, 09:00:23 AM KFKHFM adjusts load not fuel. I adjusted KFLF map up to 1.3x at high load. Runs so much better now :DStart by reading the wiki instead of posting. Title: Re: How to fix high short term fuel trim under boost. Post by: ratosluaf on March 23, 2024, 03:50:23 PM you fucked up something really bad if you need to correct your fuel by 130%
Title: Re: How to fix high short term fuel trim under boost. Post by: _nameless on March 23, 2024, 08:50:29 PM you fucked up something really bad if you need to correct your fuel by 130% That would be a 30% change 1= no change, more than 1 is more fuel. 2.3 would be 130%.Title: Re: How to fix high short term fuel trim under boost. Post by: bombis on March 31, 2024, 02:49:37 AM you fucked up something really bad if you need to correct your fuel by 130% Yeah you're right, it was too much. I¨ve spent the weekend adjusting KFLF. 1.15 or +15% runs very well :DMAF stops at 222g/s at 4800 rpm Is it ok to go at higher rpms as long as fuel/knock is ok? I¨ve ordered bigger MAF housing to get better flow/readings :D |