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nyet
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« Reply #45 on: September 22, 2011, 10:10:07 AM »
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Rick, thank you for your explanation. I will be adding it to the tuning wiki.
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Tony@NefMoto
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2001.5 Audi S4 Stage 3
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« Reply #46 on: September 22, 2011, 01:21:56 PM »
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Thanks for posting the explanation Rick. I would have opened the assembly code up again to post more info, but my laptop decided to die. Now I just have to wait a couple of weeks for a new one.  |
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berTTos
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« Reply #47 on: September 22, 2011, 01:28:53 PM »
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The purpose of LAMFA is extra torque when requested by the driver. It allows the enrichment of the mixture depending on pedal position/req load.
From the factory it is disabled by setting it to lambda 1 everywhere
holy crap. big mystery solved for me. |
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nyet
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« Reply #48 on: September 22, 2011, 02:36:28 PM »
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New wording in AFR section of s4 wiki http://s4wiki.com/wiki/Tuning#Desired_AFRYou can use the combination of both LAMFA and BTS to tailor your AFR. In particular, pre-emptive rich fueling at low actual loads (but high requested load) may inhibit knock sooner than the BTS only approach, unless you have BTS activate at very low actual loads (and/or calculated EGTs). The latter may be undesirable for fuel economy reasons; it is more fuel efficient to have BTS activate later, and let LAMFA handle high load request (but low actual load) enrichment. |
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Rick
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« Reply #49 on: September 23, 2011, 06:53:38 AM »
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Looks good Nyet  Rick |
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phila_dot
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« Reply #50 on: September 23, 2011, 07:16:04 AM »
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I am not convinced I have the proper conversion for the mrfa_w axis in lamfa.
What conversion are you guys using in your definition files for this?
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rob.mwpropane
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« Reply #51 on: September 23, 2011, 07:18:28 AM »
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Hello, great discussion. I've been following intently. In MY 2001 A4 bin, I notice lamfa is on as per x axis. I'm assuming this is because 1.8t are fitted with wideband? Which would lead me to my next question; if S4 are fitted with narrowband 02, why use lamfa at all? How acurate can lamfa be? Lamfa is requested AFR correct? How can ME7.1 accurately measure afr? (I know most of you have wideband...i hope.) I may be way off, if I am, its my lack of experience shining through. I'd didn't see any way of finding this answer without asking. Thank you.
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This has nothing to do with cars but you can see my glorifying job at, www.MWPropane.com |
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Rick
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« Reply #52 on: September 23, 2011, 07:54:25 AM »
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Phil,
I'd have to check - but from memory it's 0.03 something.
Rob - lambda is calculated, not measured.
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rob.mwpropane
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« Reply #53 on: September 23, 2011, 08:11:18 AM »
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Rob - lambda is calculated, not measured.
Doh, thank you for clarifying Rick, makes more sense now. Still not sure why x axis on 1.8t is above 1%? |
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This has nothing to do with cars but you can see my glorifying job at, www.MWPropane.com |
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Rick
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« Reply #54 on: September 23, 2011, 08:32:57 AM »
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The axis vary between ECU's but LAMFA is always disabled in anything i have seen with all table entries being 1.
Rick
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nyet
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« Reply #55 on: September 23, 2011, 10:41:16 AM »
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I am not convinced I have the proper conversion for the mrfa_w axis in lamfa.
What conversion are you guys using in your definition files for this?
My map pack has LoHi, .003052 Setzi's logger has the same for mrfa_w: mrfa_w , {DriverRequestedRelTorque} , 0x3827AA, 2, 0x0000, {%} , 0, 0, 0.00305176, 0, {Relatives Fahrerwunschmoment aus FGR und Pedal} |
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Rick
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« Reply #56 on: September 23, 2011, 11:05:50 AM »
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Yes, spot on.
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phila_dot
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« Reply #57 on: September 23, 2011, 11:26:54 AM »
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I am not convinced I have the proper conversion for the mrfa_w axis in lamfa.
What conversion are you guys using in your definition files for this?
My map pack has LoHi, .003052 Setzi's logger has the same for mrfa_w: mrfa_w , {DriverRequestedRelTorque} , 0x3827AA, 2, 0x0000, {%} , 0, 0, 0.00305176, 0, {Relatives Fahrerwunschmoment aus FGR und Pedal} Thanks Nyet and thank you Rick for shedding some light on this. I'm gonna have to log mrfa_w and see what kind of values I'm seeing. I have seen some enrichment in lamfa_w, but it must be coming from the overboost map. Does anyone know exactly what triggers the overboost condition? |
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nyet
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« Reply #58 on: September 23, 2011, 11:50:16 AM »
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As far as I know, ME7.1 mbox overboost is never active
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cam
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« Reply #59 on: September 23, 2011, 03:25:31 PM »
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Sharing my tuning process for others: KFLBTS is little richer (few percent) KFFDLBTS is all 0,25 (before 0,5) DLBTS is stock (for ignition eta keeping) engine runs better and have more power than before (KFFDLBTS 0,5 Will try to set KFFDLBTS to 0,15 ... |
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