08-18-2022, 10:23 AM | #23 |
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Forgive my ignorance and questions, but I don't quite understand what stft and ltft are and I would like to learn, I know that bank 1 and bank 2 have to be within a percentage of difference, but where are those values taken from? what is the sensor that measures it and where is it? what is bank 1 and bank 2? is the amount of fuel managed by the injection ramp? Could someone explain to me how this works?
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08-18-2022, 11:48 AM | #24 | |
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stft is short term fuel trim - this is the immediate fuel trim rich or lean represented by a positive or neg ltft is long term fuel trim - this is a learned value over time bank is normally referred to on four 02 sensor engines like a true twin turbo N54 and each bank would have an upstream (front of converter) and downsstream (behind the converter) sensor... the front sensor is used for fuel/trim and the rear 02 is used to monitor the converter... if they are mirroring each other you either have no cat or not enough cat... that's enough from me, do some research starting with the log review thread, you'll pick up a lot information...............
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08-18-2022, 12:49 PM | #25 | |
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I rely on the Google translator because my English is very bad and it is difficult for me to understand certain things I understand then, that those values come from the pre-catalyst and post-catalyst lambda probe, but in my case I have a downpipe installed, with a spacer with a mini-catalyst for the post-catalyst probe to eliminate the cel, the signal that the probe picks up post catalyst would not be falsified? |
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08-18-2022, 03:37 PM | #26 |
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that would be so great to have a thread/post with all the logging parameters explained.. so hard to find informations on some sensors/values
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08-18-2022, 04:59 PM | #27 | |
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08-22-2022, 10:58 AM | #29 | |
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08-22-2022, 11:01 AM | #30 | |
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sensor 1 and sensor 2 are before and after the cat. only sensor 1 measures afr. you will not see sensor 2 as a direct reading in logs but some data indicates it has an effect on fuel trims. sorry if that made it more confusing. |
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08-22-2022, 11:02 AM | #31 | |
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https://f30.bimmerpost.com/forums/sh....php?t=1648722 |
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08-22-2022, 11:26 AM | #32 |
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If it got that bad, it wouldn't really do this, it would rather produce more intense pops, burbles, and misfires detected off the crankshaft sensors. At fault injectors and boost usually shutdown shortly as safeties.
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08-22-2022, 12:20 PM | #33 |
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So lets say you're on OEM burbles tuned and on catless downpipes. Sometimes you get some nice loud pops here and there when down shifting but I assume you mean your normal burble settings turn more into like pops and bangs/flames?
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08-22-2022, 11:23 PM | #34 |
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I have my burbles turned off and I still get short burbles when down-shifting only in sport mode or even letting off the pedal in sport mode. I have a cat-less dp, AWE mid pipe, and the MPE so I'm assuming its part of the MPE nature with no resonated mid pipe which makes it more audible. If anyone knows a fix to this please chime in lol. I remember back in 2018 I still had minor burbles with just a cat-less dp and the MPE with stock mid-pipe running a JB4 only.
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08-23-2022, 07:38 AM | #35 | |
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08-23-2022, 08:17 AM | #36 |
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If its a slight leak then you may not notice it as much as its usually one injector but as it get worse where the quantity of fuel leaked gets to the point where you are now not burning gas completely in the piston your burbles and pops in the headers, turbo, and downpipe get pronounced and you may even get loud bangs and that is why boost is usually shutdown by the ecu at a certain point.
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08-23-2022, 01:05 PM | #37 | |
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08-23-2022, 05:10 PM | #38 | |
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08-23-2022, 07:18 PM | #39 | |
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08-23-2022, 07:54 PM | #40 |
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B58 injectors are fairly cheap. You can always buy 6 of them and have them sitting around or just swap them out for a peace of mind. I rather spend $1,000 on injectors and swap them out at home than have to drop money on a new motor. The B58 is delicate when it comes to leaking injectors. I had 2 scored up cylinder walls. The N54's are notorious for leaking injectors, but they are more forgiving and those injectors now cost $3,000 for a 6 pack so lets hope the B58 doesn't creep up in pricing.
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08-24-2022, 04:26 AM | #41 | |
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I can't see any evidence of leaking injector (please experts, correct me if I'm wrong). actual AFT match pretty nicely target AFR. STFT is from 0.92 to 1. On the first log, when you lift accel pedal, we can see AFR going up immediately. If one injector was leaking, AFR should take a bit of time to go up I just noticed some dips in hpfp when shifting, but it may be normal. I don't know If someone things this logs can show leaking injector, please explain. I really need to understand where. |
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08-24-2022, 06:22 AM | #42 | |
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08-24-2022, 01:08 PM | #43 |
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Alright for sure. I've at 47k miles and I got the car at 28k miles so I was just thinking once I up the boost with PI that it would be good preventative maintenance.
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08-24-2022, 01:15 PM | #44 | |
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One is in 4th https://www.bootmod3.net/log?id=6306...90c624de5241cd this is 5th https://www.bootmod3.net/log?id=6306...729b57a4e400e1 |
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