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sn00k
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« on: October 16, 2012, 12:10:35 PM »
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So.. logging lambda i find these dips down to approx lambda 0.8 right after i release the trottle and decelerate.. for a brief moment.. and every time i let go of the thottle this happens. im assuming this is the "wall-wetting" function, correct? since im running alcohol i doubt this function would be of any use to me, other then wasting precious fuel, and so i want to disable it, how do i do this? looking in funktionsrahmen i find maps FWFN and WFRL to be the ones to alterd.. now my WFRL map looks very strange with the definition im using, and so, i do not know what the conversion should be, or how to alter it.. ..any input? someone alterd this function?  |
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ABCD
Full Member
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« Reply #1 on: October 16, 2012, 10:16:48 PM »
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So.. logging lambda i find these dips down to approx lambda 0.8 right after i release the trottle and decelerate.. for a brief moment.. and every time i let go of the thottle this happens. im assuming this is the "wall-wetting" function, correct? since im running alcohol i doubt this function would be of any use to me, other then wasting precious fuel, and so i want to disable it, how do i do this? looking in funktionsrahmen i find maps FWFN and WFRL to be the ones to alterd.. now my WFRL map looks very strange with the definition im using, and so, i do not know what the conversion should be, or how to alter it.. ..any input? someone alterd this function? If u want to disable it, just put WFRL map 0 throughout. |
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Bische
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« Reply #2 on: October 16, 2012, 10:35:48 PM »
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Is it requesting .8 or is it just actual that dips down to .8?
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sn00k
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« Reply #3 on: October 17, 2012, 03:18:16 AM »
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If u want to disable it, just put WFRL map 0 throughout. i dont know if i have the right definition of this map.. i think i have the location tho.. can someone specify the specifics of the map? (8/16bit, conversion etc) im also not sure if zeroing it out will disable it completely, since it seems to ADD FWFN * nmot_w to the equation.. thoughts? Is it requesting .8 or is it just actual that dips down to .8?
both requested and actual dips to .8 |
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professor
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« Reply #4 on: October 17, 2012, 03:47:44 AM »
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WFRL (%):
16bit LoHi 31*1 (onedimensional)
Offset: 0.09375
Precision: 3
X-Axis:
8bit Decimal
Offset: 6
precision: 4
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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©
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sn00k
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« Reply #5 on: October 17, 2012, 08:55:25 AM »
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thanks professor, that matched my definition.. =)
so.. i must have the wrong adress.. you have a picture of how the map is supposed to look like in 2d?
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professor
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« Reply #6 on: October 17, 2012, 09:21:23 AM »
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thanks professor, that matched my definition.. =)
so.. i must have the wrong adress.. you have a picture of how the map is supposed to look like in 2d?
What ecu is it perhaps to find it for you. |
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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©
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sn00k
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« Reply #7 on: October 17, 2012, 11:09:24 AM »
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06A906032HN
the attached bin..
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professor
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« Reply #8 on: October 17, 2012, 11:41:01 AM »
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WFRL loc @ 1559A.
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« Last Edit: October 17, 2012, 11:48:06 AM by professor »
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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©
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sn00k
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« Reply #9 on: October 17, 2012, 01:57:18 PM »
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WFRL loc @ 1559A.
awesome professor, now i can dig further into disabling this.. thank you  |
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professor
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« Reply #10 on: October 17, 2012, 02:15:41 PM »
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awesome professor, now i can dig further into disabling this.. thank you More than welcome dear sn00k |
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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©
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Instigater
Newbie
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« Reply #11 on: February 29, 2016, 11:50:42 AM »
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I have an 2.7bit Audi engine equiped with LPG gaseous fuel system. Engine jerks a brief moment during liftoff and switching gears is very unpleasant. I nulled WFRL in hope that it will be OK during warmup phase while engine still runs on gasoline and perfect on LPG. In first seconds I noticed that it will not be possible to use this approach on particular engine while it runs on gasoline - there is no issue on liftoff but pressing accelerator is accompanied with very noticeable judder, lag and a bang under the bonnet. Is there a way to disable wall wetting calculation on liftoff and still it be active on acceleration? What values should I target in KFAVAK?
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« Last Edit: February 29, 2016, 12:13:16 PM by Instigater »
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phila_dot
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« Reply #12 on: February 29, 2016, 12:19:53 PM »
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Misguided thread.
This function is to account for the wall-film or lack thereof in order to always maintain target lambda.
It does not adjust target lambda nor is it intended to enrich on decel.
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Instigater
Newbie
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« Reply #13 on: February 29, 2016, 01:18:43 PM »
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I'm not going to enrich it. I presume that jerk is because there is no gasoline film in LPG mode yet ECU is still accounting for ir to contribute some fuel. This brings lambda so high that LPG is not igniteable and I get lean missfire. Another noticed effect on LPG is that right after medium acceleration and lifting accelerator to steady speed position initialy yields lower power than needed for steady state - lambda high but no lean missfire.
prj in another thread stated that wall-wetting compensation should be disabled alltogether on gaseous fuels. As I'm on dual fuel, I want some sacrifices - compensation on acceleration for safe petrol operation during warmup and disabled on deceleration.
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« Last Edit: February 29, 2016, 01:20:46 PM by Instigater »
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phila_dot
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« Reply #14 on: February 29, 2016, 01:39:36 PM »
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Wasn't really directed at you.
Look at KFBAKL and KFVAKL
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