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Author Topic: Opinions: using KFLBTS vs LAMFA for fuel all the time?  (Read 341432 times)
s5fourdoor
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« Reply #285 on: March 11, 2012, 12:30:37 PM »

OK, great work.  Here's the map pack with the most recent torque maps, dynamic KR fueling, and nls/als + misc code-words discussed in recent months.  [obviously an assembly modified bin is required to have the nls/als]  [old news]

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nyet
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« Reply #286 on: March 31, 2012, 11:08:36 AM »

Updated wiki to reflect KR and LAMFA based fueling

http://s4wiki.com/wiki/Tuning#Open_loop_AFR

comments welcome!
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nyet
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« Reply #287 on: March 31, 2012, 11:36:55 AM »

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

Ok, thats retarded.

Using my basic algebra I skills,

1-(1-x) =  x

So isn't this equivalent to

(KFLAMKRL+DLAMTANS) * KFLAMKR?

[edited to fix stupid algebra error Smiley]
« Last Edit: March 31, 2012, 01:51:29 PM by nyet » Logged

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phila_dot
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« Reply #288 on: March 31, 2012, 12:55:52 PM »

Ok, thats retarded.

Using my basic algebra I skills,

1-(1-x) = 1 + x

So isn't this equivalent to

1 + (KFLAMKRL+DLAMTANS) * KFLAMKR

There's obviously a sign missing some place, because aren't both KFLAMKRL and KFLAMKR positive?

Given ...
KFLAMKRL = 11.7
DLAMTANS = 0
KFLAMKR   = 1

1 - (1- ((11.7 + 0) * 1))

1 - (1 - 11.7)

1 -  (-10.7)

11.7
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nyet
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« Reply #289 on: March 31, 2012, 01:33:52 PM »

that makes no sense Sad KFLAMKRL is in delta lambda not delta AFR
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phila_dot
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« Reply #290 on: March 31, 2012, 01:42:44 PM »

that makes no sense Sad KFLAMKRL is in delta lambda not delta AFR

Ok... plug in .85

1 - (( 1 - ( .85 + 0 )) * 1)

1 - ( .15 )

.85

Adding DLAMTANS makes it more clear

1 - (( 1 - ( .85 + -.03 )) * 1 )

1 - (( 1 - .82 ) * 1 )

1 - ( .18 * 1 )

1 - ( .18 )

.82

Edit : The correct formula is 1 - (( 1 - (KFLAMKRL + DLAMTANS)) * KFLAMKR), so if you choose to offset for IAT then DLAMTANS needs to be negative.
« Last Edit: April 01, 2012, 12:43:25 AM by phila_dot » Logged
nyet
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« Reply #291 on: March 31, 2012, 01:49:34 PM »

Oh, i'm stupid

1-(1-x) is x lol.

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jibberjive
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« Reply #292 on: March 31, 2012, 03:31:19 PM »

LAMFAWKR, did anyone else find this variable funny?
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julex
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« Reply #293 on: April 02, 2012, 01:35:09 PM »

Inevitable happened today. After getting a tank of 93 octane fuel I proceed to floor it on the highway and all of the sudden I dip to 10.3:1 AFR during all out WOT... that's with meth squirting...

On a normal car it wouldn't be anything alarming unless of course this would be a result of bad misfires, but on my car it is indicative of severe KR fueling intervention. I quickly logged the car and I clock -8.5 corrections which is what I would normally get if I run out of meth on 93, but meth is squirting as verified by running pump on manual and the fact that the level dropped during next run.

This only means that either I dozed off and pumped 87 octane or something, not likely, or the assholes at gas station are cheating badly on fuel.

Conclusion is that if I had fixed BTS fueling I would had much heavier corrections at a target AFR with possibility of maxxing them out altogether and pinging he engine..



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phila_dot
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« Reply #294 on: April 02, 2012, 01:50:33 PM »

Conclusion is that if I had fixed BTS fueling I would had much heavier corrections at a target AFR with possibility of maxxing them out altogether and pinging he engine..

Can you clarify the above statement? I don't understand what you mean by "fixed" BTS.

Scary shit though...
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julex
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« Reply #295 on: April 02, 2012, 01:55:28 PM »

KR enrichens more and more the higher correction factors are used.
BTS is effectively fixed in that respect. You'll run the same AFR regardless of knock.
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phila_dot
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« Reply #296 on: April 02, 2012, 02:39:37 PM »

KR enrichens more and more the higher correction factors are used.

Personally, I don't enrich via KFLAMKRL beyond my zero row until ~-8 because of DZWWL's influence. On a typical pull, DZWWL will offset dzlamfaw by -1.5 to -3.

BTS is effectively fixed in that respect. You'll run the same AFR regardless of knock.

Only true if you have disabled LAMBTSZW via DLBTS and KFFDLBTS.
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nyet
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« Reply #297 on: April 02, 2012, 02:52:54 PM »

Personally, I don't enrich via KFLAMKRL beyond my zero row until ~-8 because of DZWWL's influence. On a typical pull, DZWWL will offset dzlamfaw by -1.5 to -3.

I thought dzwwl typically offets dzlamfaw the OTHER direction (hence setting CWLAMFAW bit 0 to 0)
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phila_dot
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« Reply #298 on: April 02, 2012, 03:07:30 PM »

I thought dzwwl typically offets dzlamfaw the OTHER direction (hence setting CWLAMFAW bit 0 to 0)

If load is greater than ~60 and IAT is greater than ~39* c, DZWWL will be negative.

http://nefariousmotorsports.com/forum/index.php?topic=141.msg15921#msg15921
« Last Edit: April 02, 2012, 03:09:03 PM by phila_dot » Logged
nyet
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« Reply #299 on: April 02, 2012, 05:36:14 PM »

Any suggestions for wording describing that for the s4wiki?
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
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