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Author Topic: Possible to disable LTFTs for long term fueling tuning?  (Read 15662 times)
nyet
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« on: August 25, 2011, 04:58:24 PM »

While doing long term tuning, sometimes I wish there was a way to disable LTFTs so I can tweak fueling appropriately, w/o worrying about what is going on behind the scenes.

Does anybody know an easy way to disable LTFTs?
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phila_dot
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« Reply #1 on: August 25, 2011, 05:27:58 PM »

CFRA?

Edit : NOLRA might be a better fit.
« Last Edit: August 25, 2011, 05:36:49 PM by phila_dot » Logged
nyet
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« Reply #2 on: August 25, 2011, 05:40:37 PM »

Thanks, ill check it out.
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« Reply #3 on: August 25, 2011, 06:54:24 PM »

it is for sure non functional on this file.

swap mlhfm and mlofs for m-box stuff and just try it.
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240sxpooter
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« Reply #4 on: September 01, 2011, 05:39:40 AM »

While doing long term tuning, sometimes I wish there was a way to disable LTFTs so I can tweak fueling appropriately, w/o worrying about what is going on behind the scenes.

Does anybody know an easy way to disable LTFTs?

 I just unplug the Evap solenoid.
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gremlin
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« Reply #5 on: September 01, 2011, 04:08:55 PM »

Does anybody know an easy way to disable LTFTs?

VCDS -> 099 -> switch basic settings ON -> LR off -> LTFT off
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nyet
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« Reply #6 on: September 01, 2011, 04:09:57 PM »

Gremlin: THANKS, just what I was looking for.
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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.
julex
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« Reply #7 on: September 02, 2011, 08:01:44 AM »

it is a minor annoyance of mine as well. But I am wondering if completely disabling LTFTs is really worth it... I wish there was a way of doing this easily for WOT conditions only.

Anybody knows if LTFT load thresholds are in some map or is it in the code?

What I mean by that is that I know for a fact there are at least 4 different sets of LTFTs values that can can show in block 032 partial load depending on current engine load. While I am ok with LTFTs being active for lambda=1 condition, the ECU also extrapolates WOT (full load) LTFT value from lesser load LTFTs and uses it when WOTing affecting AFRs. This results in annoying situation where you tune your car for perfect WOT AFRs and then weeks later the AFRs drift off from target and you find LTFTs while WOT not being "0" but some other value.

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Snow Trooper
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« Reply #8 on: September 02, 2011, 12:31:18 PM »

Ha, now I understand why I don't have LTFTs anymore... No evap.
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nyet
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« Reply #9 on: September 02, 2011, 01:06:52 PM »

What I mean by that is that I know for a fact there are at least 4 different sets of LTFTs values that can can show in block 032 partial load depending on current engine load.

Are you referring to these?

Code:
fra2_w            ;{AdaptationPartialBank2}           ; {multiplikative Gemischkorrektur der Gemischadaption (Word) Bank 2}
fra_w             ;{AdaptationPartial}                ; {multiplikative Gemischkorrektur der Gemischadaption (Word)}
frao2_w           ;{}                                 ; {multiplikativer Gemischadaptionsfaktor oberer Lastbereich (Word) Bank 2}
frao_w            ;{}                                 ; {multiplikativer Gemischadaptionsfaktor oberer Lastbereich (Word)}
frau2_w           ;{}                                 ; {multiplikativer Gemischadaptionsfaktor unterer mult. Bereich (Word) Bank 2}
frau_w            ;{}                                 ; {multiplikativer Gemischadaptionsfaktor unterer mult. Bereich (Word)}

and some idle ones too

Code:
rkat2_w           ;{AdaptationIdleBank2}              ; {additive Gemischkorrektur (pro Zeit) der Gemischadaption Bank 2 (Word)}
rkat_w            ;{AdaptationIdle}                   ; {additive Gemischkorrektur (pro Zeit) der Gemischdaption (Word)}
rkaz2_w           ;{}                                 ; {additive Gemischkorrektur (pro Z�ndung) der Gemischadaption Bank2 (Word)}
rkaz_w            ;{}                                 ; {additive Gemischkorrektur (pro Z�ndung) der Gemischadaption}
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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.
julex
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« Reply #10 on: September 08, 2011, 09:57:37 AM »

Are you referring to these?

Probably. For proper AFRs at WOT it would be a good idea to disable LTFTs for that load range.
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professor
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« Reply #11 on: April 24, 2012, 10:53:03 AM »

NOLRA does not disable ltft's on ME7.5.

According to documentation:
The additive correction per time rkat_w calculated by the subfunction INTRKAT is multiplied by the factor N0/nmot (value
N0=640 rpm) and added to the additive correction per injection calculated by the subfunction INTRKAZ and then it is passed on
to the injection calculation (see mixture check %GK) as additive correction rka_w.


So i assume that by changing N0 == 0,  rkat_w == 0 so LFTF's are disabled.

What do your think of that? Do i miss something?
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phila_dot
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« Reply #12 on: April 24, 2012, 11:39:11 AM »

You need to disable rkaz too.

NOLRA can individually disable each range.
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nehalem
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« Reply #13 on: April 24, 2012, 12:19:49 PM »

Are you referring to these?

Code:
fra2_w            ;{AdaptationPartialBank2}           ; {multiplikative Gemischkorrektur der Gemischadaption (Word) Bank 2}
fra_w             ;{AdaptationPartial}                ; {multiplikative Gemischkorrektur der Gemischadaption (Word)}
frao2_w           ;{}                                 ; {multiplikativer Gemischadaptionsfaktor oberer Lastbereich (Word) Bank 2}
frao_w            ;{}                                 ; {multiplikativer Gemischadaptionsfaktor oberer Lastbereich (Word)}
frau2_w           ;{}                                 ; {multiplikativer Gemischadaptionsfaktor unterer mult. Bereich (Word) Bank 2}
frau_w            ;{}                                 ; {multiplikativer Gemischadaptionsfaktor unterer mult. Bereich (Word)}

and some idle ones too

Code:
rkat2_w           ;{AdaptationIdleBank2}              ; {additive Gemischkorrektur (pro Zeit) der Gemischadaption Bank 2 (Word)}
rkat_w            ;{AdaptationIdle}                   ; {additive Gemischkorrektur (pro Zeit) der Gemischdaption (Word)}
rkaz2_w           ;{}                                 ; {additive Gemischkorrektur (pro Z�ndung) der Gemischadaption Bank2 (Word)}
rkaz_w            ;{}                                 ; {additive Gemischkorrektur (pro Z�ndung) der Gemischadaption}




nyet, have you tested all of these?  i tried some and they were rejected...  i'll try again this evening after work.
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nyet
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« Reply #14 on: April 24, 2012, 12:36:33 PM »

yea, they all work for me.
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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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