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Title: Factory KFLBTS, why so lean pre-boost? Post by: ohhello on January 17, 2013, 07:53:05 AM I know KFLBTS is activated with respect to the EGT model but why so lean just ahead of what I'm seeing is boost onset?
EGT's are already high if this map is active so what's the deal? I've seen this before on other ME7.x versions with other manufacturers but never really understood why? After the initial lean section it get's properly rich as you would expect a lambda protection map to.... Attached screen shot is from ME7.5 Jetta 1.8L 180hp stock file. Thanks in advance for any input :) Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: RaraK on January 17, 2013, 09:43:27 AM It would be deactivated in those spots.
Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: ohhello on January 17, 2013, 09:57:09 AM I suppose that makes sense, but then why have it default so lean? Some factory KFLBTS maps I've seen were all lambda 1 in those areas and did not trend lean like the image I attached.
Additionally I've seen tune files from medium sized tuning houses like BC consulting actually increase the lean bump in certain areas... feel like there's something I'm missing ??? Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: Rabbid on January 17, 2013, 10:08:58 AM Are you sure the map is correctly defined?
Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: ohhello on January 17, 2013, 10:40:50 AM Pretty sure, I have the damos for it and I've seen more than a few stock maps this way including the professionally tuned files I've seen.
It's also reflected going back as far as Motronic V3 as you can see the main fueling maps do the same thing (to lesser degree) just before boost onset and the enrichment of the mixture. Initially I though it might be to help put some heat into the exhaust for catalyst warm up or turbo spooling but that just doesn't add up, especially when you consider KFLBTS is only used when EGT model activates it. Lamfa on these maps is at 1.0 across the board except at low load, high rpm which makes sense. Maybe I just need to read more ;D Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: prj on January 17, 2013, 12:57:52 PM First of all, it won't run leaner than Lambda 1.
Secondly, the BTS fueling is not just one map. Look at the FR. Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: IamwhoIam on January 17, 2013, 02:37:17 PM First of all, it won't run leaner than Lambda 1. Secondly, the BTS fueling is not just one map. Look at the FR. He has the damos he said :D Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: prj on January 17, 2013, 03:00:28 PM Lamfa on these maps is at 1.0 across the board except at low load, high rpm which makes sense. Maybe I just need to read more ;D Damos is wrong. Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: professor on January 17, 2013, 03:55:03 PM Damos is wrong. By one byte exactly.Title: Re: Factory KFLBTS, why so lean pre-boost? Post by: ohhello on January 18, 2013, 10:57:02 PM I know KFLBTS is only one enrichment map for lambda protection and there's additional enrichment maps from drivers input or ignition degredation but my interest is in why some KFLBTS have 1.0 lamba at max value and some go above 1.0 lamba just before boost.
If Damos is off I'm open to input but the 'pro tuner' file I have must then also be off because they line up identically... Of course I could be misreading it :-\ |