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Title: Overrun Fueling using KFLBTS? Post by: rzyao on November 18, 2024, 07:39:18 AM I'm immature and want flames out of my exhaust. I've already played with KFTVSA, KFZWMN (and the other timing maps), and KFLF, and I can get some good loud noises, but I'd rather have a quieter noise with a big flame out the back. How can I add more fuel in low load? It looks like the only option to adjust low load fueling is KFLBTS, but being the temperature-triggered map it seems like I should be using something else to richen the mixture. KFLF doesn't seem like the right way to go, and LAMFA only appears to be load 80 and up (but my definition has broken axes).
I'm also not sure if there's a way to trigger open-loop fueling on overrun that anyone knows of. If anyone else knows how to get those huge flames (like red and billowing, not the jet-like ones you get on a really powerful bang), I'd like to know since I'm also not sure how to ignite it other than the hot turbo. Yes, I know this probably isn't great for the car. ECU is 4b0906018P, 2000 A4 1.8t ATW Title: Re: Overrun Fueling using KFLBTS? Post by: rzyao on November 18, 2024, 07:40:23 AM Yes, I know this has been asked a billion times, but I haven't found a solid answer in my hours of digging
Title: Re: Overrun Fueling using KFLBTS? Post by: fknbrkn on November 18, 2024, 08:18:34 AM Check for LASOAB
Title: Re: Overrun Fueling using KFLBTS? Post by: rzyao on November 18, 2024, 09:29:27 AM I can't find it in my definition, and I'm having a little trouble understanding what it does. Does it just set the target lambda at a given load/rpm? If it does, what else overrides it? All I can see is that it supposedly takes priority over KFLBTS, but I can't tell when. I'm not sure if it's in my ECU and since it seems like a map that's hardly touched, I can't find an address for it.
Title: Re: Overrun Fueling using KFLBTS? Post by: gremlin on November 18, 2024, 12:20:22 PM I can't find it in my definition LASOAB is single 8-bit value. Factor = 0,0078125 Address depends on firmware version you using 0x15358 in fw 352750 (4B0906018P 0006) 0x15347 in fw 396635 (4B0906018P 0009) Title: Re: Overrun Fueling using KFLBTS? Post by: rzyao on November 18, 2024, 05:21:37 PM LASOAB is single 8-bit value. Factor = 0,0078125 Thank you! One more question, what exactly does this value affect? Is it just open-loop target lambda during overrun? If so, what exact conditions trigger it? If my understanding is correct, to target 10 AFR, I would set the raw value to 87. Stock is 1.03 (133 raw value) Title: Re: Overrun Fueling using KFLBTS? Post by: rzyao on November 19, 2024, 09:05:00 AM It looks like LASOAB is controlled by AEVAB, which I understand to be injector cutoff? So, if I'm following, when the car shuts off the injectors, it targets a slightly lean AFR to avoid damaging the catalyst. Does this target AFR also affect overrun (after letting off throttle, during the injector shutoff delay set by KFTVSA)?
If so, as I understand it, letting off the throttle will immediately make the ECU target LASOAB using the MAF sensor readings in open loop, and then once the time delay set by KFTVSA ends, it will cut ignition entirely? |