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Author Topic: Opinions: using KFLBTS vs LAMFA for fuel all the time?  (Read 352142 times)
julex
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« Reply #345 on: April 13, 2012, 07:37:38 AM »

I think we all understand LAMKR. I believe elray's point was about map resolution and nyet was referring to actual knock regulation dwkrz etc.

Why set BTS so high basically duplicating ATR?

I want to BTS to kick in just before ATR to hopefully prevent ATR from engaging. ATR kicks in at 950c physical. I went through great pains to ensure that my fueling and MAF scaling is as close to real value (not underscaled) and actually logged BTS vs ATR while torturing my engine. In my tune, there was only 10c difference when temps entered ATR reaction zone.

Otherwise I don't want the BTS interfering with anything.
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Snow Trooper
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« Reply #346 on: April 13, 2012, 12:21:06 PM »

I feel like we are all talking and working in circles here...

Julex and I are obviously on the same page.

I feel like my fuel strategy post got over looked by a few because if they would have read it and grasp the concepts involved the last page or so wouldn't have happened.

Not to tooth my own horn since its all based off what I learned here other than my standard knowledge of VE, AFR and boosted engines in general but I just gave you guys a bitchin way to use the capabilities within our ecus, go freaking try it.   Wink

Remember our systems follow the lowest AFR request being imputed by a number of different maps, you need to picture it all in 3d / realtime. Resolution is not something to get caught up on.
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elRey
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« Reply #347 on: April 13, 2012, 01:33:59 PM »

Resolution is not something to get caught up on.

Would you be happy if your timing map had same resolution as your LAMKR map?
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Snow Trooper
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« Reply #348 on: April 13, 2012, 01:52:09 PM »

You need to log it in process and see the resolution that is added to the maps as they work together.  Think of it as a sum of all parts.  You get the resolution from our sophisticated, redundant inputs and outputs.

Tune all the maps to compliment each other.  my strategy was cooked up in my head, flashed, driven 2 or 3 different occasions to find holes, fixed those holes and even in a non fine tuned form it is flawlessly smooth in all aspects.
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sn00k
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« Reply #349 on: April 13, 2012, 02:31:48 PM »

So basically.. to sum things up.. (in my head, after reading countless of pages..)

i can use KFLAMKRL as "main" fueling path.. at column "0 degrees", and this map is lambda value, with actual engine load% as the other axis?(this axis wont go over 100%, right?)

..then i add more fuel at higher "degree" columns if knock activity raises and more timing is pulled..

i can then use LAMFA, which is rpm and requested torque based, to add preemptive fuel at spots where i know the engine is prone to detonation.. ie att the tq peak.. leaving the rest of the map at lambda 1 (for the KFLAMKRL to override as primary).

i then have BTS kick in at high calculated EGT(850-900ish) to cool things down if pushed too hard, i.e long pulls at the track.

ATR is actual EGT-sensors and regarding those maps?


have i understood things correctly? or are there more maps i need to fiddle with regarding the KR based fueling?

i have been following this interesting thred for quite some time now, thumbs up for all the time spent looking into this, keep up the good work guys  Smiley
« Last Edit: April 13, 2012, 02:35:30 PM by sn00k » Logged
s5fourdoor
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« Reply #350 on: April 13, 2012, 03:40:42 PM »

correct, precisely said:

KFLAMKR/L - new main fueling map governed my 0 knock row...

LAMFA - slow-responding afr-driver's request, nice to have targets for pre-fueling effect

BTS - TABGBTS is model temp toggle switch between LAMFA and KFLBTS for component protection, set to 850/900/950 as fueling safety

ATR - actual EGT, goverened by TABGSS / TABGSS2, set to 1100 to turn off + turn off egt dtc's
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phila_dot
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« Reply #351 on: April 14, 2012, 07:39:16 PM »

i can use KFLAMKRL as "main" fueling path.. at column "0 degrees", and this map is lambda value, with actual engine load% as the other axis?(this axis wont go over 100%, right?)
rl_w will exceed 100.
mrfa_w in LAMFA will not exceed 100%.

..then i add more fuel at higher "degree" columns if knock activity raises and more timing is pulled..
Yes, just remember that this axis is not considering only knock regulation. It is also includes dzwwl which will offset wkrma a few degrees.

i then have BTS kick in at high calculated EGT(850-900ish) to cool things down if pushed too hard, i.e long pulls at the track.

Personally, I have tabgbts set to 650 and plan to adjust it accordingly from logs.

have i understood things correctly? or are there more maps i need to fiddle with regarding the KR based fueling?

KFLAMKR - multiplier for lambda in KFLMAKRL
KFLAMKRL - target lambda values
DLAMTANS (optional) - offset lambda for IAT
CWLAMFAW - clear bit 0 to disallow positve offset from DZWWL
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Bische
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« Reply #352 on: April 15, 2012, 04:39:07 AM »

My CWLAMFAW is 36 in decimal, if I put 36 in calc and hit binary, the first number(bit?) from right is 0.

Does this mean my CWLAMFAW bit is set to 0?(as we want it to be for using KR fueling?)
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sn00k
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« Reply #353 on: April 15, 2012, 05:23:59 AM »

rl_w will exceed 100.

ok, thank you for clarifying, and this is actual load?
why im asking is my axis in a me7.5 032HN box looks like this:

20.25
39.75
60.00
69.75
80.25
90.00

which is totally useless then for this KR-based fueling method..
and you would think this would go beyond 100 even in the stock tune.. yet it doesnt..
is there a reason why it looks like this? which other relevant MAPS share this axis? (if i am to modify it..)


DLAMTANS, can this one be tuned to i.e add extra fuel at IATs higher then +50c? (originally it seem to be configured for extreme cold conditions)
« Last Edit: April 15, 2012, 05:26:03 AM by sn00k » Logged
marcellus
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« Reply #354 on: April 25, 2012, 09:49:08 PM »

I was trying to say KFLAMKRL is useless with stock KFLAMKR.

lamfawkr_w = 1-(1 - (KFLAMKRL + DLAMTANS) * KFLAMKR)



How did you change the column header on the DLAMTANS?
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phila_dot
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« Reply #355 on: April 25, 2012, 09:59:43 PM »

How did you change the column header on the DLAMTANS?

Column units
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marcellus
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« Reply #356 on: April 25, 2012, 11:52:28 PM »

I guess I asked the wrong question.  Mine reads 8.25, -48., -48, 50.25.   How do you change those values?
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julex
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« Reply #357 on: April 26, 2012, 01:02:56 PM »

I guess I asked the wrong question.  Mine reads 8.25, -48., -48, 50.25.   How do you change those values?

Either axis address is bad or an option called "Step" in the table definition is set to default -4 or whatever tunerpro likes to do. my TunerPro likes to reset these on some of my maps for no reason resulting in weird looking axes.
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phila_dot
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« Reply #358 on: April 26, 2012, 07:54:36 PM »

Either axis address is bad or an option called "Step" in the table definition is set to default -4 or whatever tunerpro likes to do. my TunerPro likes to reset these on some of my maps for no reason resulting in weird looking axes.

The address step for DLAMTANS axis should be 1 as it is 8 bit.

Address step is 1 for 8 bit values and 2 for 16 bit values. If you set it to 0 it will revert to -4 and not display correctly.
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marcellus
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« Reply #359 on: April 27, 2012, 08:57:10 AM »

THank you!  Its fixed now.

Here's what I had to do for future reference:
 I had to change the label source to "internal pure".  This allowed to to edit the address step.  I then changed the address step to 1 in both rows and columns.  it was at -4.
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