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Title: Possible to disable LTFTs for long term fueling tuning? Post by: nyet 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? Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: phila_dot on August 25, 2011, 05:27:58 PM CFRA?
Edit : NOLRA might be a better fit. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: nyet on August 25, 2011, 05:40:37 PM Thanks, ill check it out.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: Snow Trooper 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. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: 240sxpooter 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. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: gremlin 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 Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: nyet on September 01, 2011, 04:09:57 PM Gremlin: THANKS, just what I was looking for.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: julex 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. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: Snow Trooper on September 02, 2011, 12:31:18 PM Ha, now I understand why I don't have LTFTs anymore... No evap.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: nyet 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}and some idle ones too Code: rkat2_w ;{AdaptationIdleBank2} ; {additive Gemischkorrektur (pro Zeit) der Gemischadaption Bank 2 (Word)}Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: julex 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. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: professor 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? Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: phila_dot on April 24, 2012, 11:39:11 AM You need to disable rkaz too.
NOLRA can individually disable each range. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: s5fourdoor on April 24, 2012, 12:19:49 PM Are you referring to these? Code: fra2_w ;{AdaptationPartialBank2} ; {multiplikative Gemischkorrektur der Gemischadaption (Word) Bank 2}and some idle ones too Code: rkat2_w ;{AdaptationIdleBank2} ; {additive Gemischkorrektur (pro Zeit) der Gemischadaption Bank 2 (Word)}nyet, have you tested all of these? i tried some and they were rejected... i'll try again this evening after work. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: nyet on April 24, 2012, 12:36:33 PM yea, they all work for me.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: professor on April 24, 2012, 01:43:42 PM You need to disable rkaz too. CDKVS == 0 no adaptive control is active (B_gaefra and B_gaeing are set to FALSE), cause RKAM (= RKAT resp. RKAZ) is never stabilized.NOLRA can individually disable each range. Correct or not? Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: professor on April 25, 2012, 12:09:34 PM My work so far:
tried N0 == 0 (rkat_w == 0), CDKVS == 0, NOLRA == 0 or 2 (rkaz reset) or 5 None of the above, even with some combinations ( NOLRA == 2 && N0 == 0 or CDKVS == 0 && NOLRA == 5), disable LTFT's. I unplug evap solenoid and LTFT's are working. I am open to any usefull advise or route to examine ;D Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: masterj on May 26, 2012, 04:22:30 PM So, anyone found working solution on how to disable LTFT? ;D
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: professor on May 27, 2012, 01:40:51 AM NOLRA == 5 to me without any other changes.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: s5fourdoor on May 27, 2012, 04:43:06 PM NOLRA == 5 to me without any other changes. Nothing else and its good to go? Great find man! Can anyone verify this on their m-box setup? I'll try if I get a moment this evening. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: @lq! on May 27, 2012, 11:03:11 PM Is there a way to turn off the m 3.8x or m 5.9.2 ?
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: @lq! on May 30, 2012, 11:32:36 AM any think ?
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: sander82 on September 23, 2013, 01:45:14 AM Hi,
I have a seat ibiza cupra 1,8 turbo 180hp and I need to disable LTFTs for long term fueling but I don't know the parameter "NOLRA". I chipped this car with Alientech kit but I can't disable this...can you help me?? Thankssss!!! Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: ddillenger on September 23, 2013, 09:46:47 AM Pull your SAI relay out.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: sander82 on September 23, 2013, 12:15:22 PM Pull your SAI relay out. Thanks! Today I found the norla parameter. In origin is set to 4, I can set it to 5 and zero but after flash the ecu the O2reg in 099 group is On and the ltft, after many km is -7. When arrived -24 the mil is on with low boost pressure...can you help me?Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: technic on September 23, 2013, 12:27:17 PM I'd be careful disabling LTFT if I had -24 corr and limp...
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: sander82 on September 23, 2013, 01:19:00 PM I'd be careful disabling LTFT if I had -24 corr and limp... You sure!!! But..can I disable LTFT?? I put NORLA=5 and zero but LTFT is on :(Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: marian_gbg on May 30, 2016, 02:26:53 PM Hi,
can someone tell me how I can enable LTFTs with VCDS if disablet ? Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: FlyboyS4 on September 27, 2017, 03:48:27 PM VCDS -> 099 -> switch basic settings ON -> LR off -> LTFT off I take it there are a few other selections taking place between VCDS -> 099 to disable LTFT. Could someone fill in the other steps. Looking at VCDS I am not seeing how this is performed. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: Lost on September 29, 2017, 02:36:23 AM Engine/basic settings - ch99
As soon you enter 99 Lambda regulation turns off. This is simple way to check if injectors are setup properly at idle. Needs wb02. Cheers. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: FlyboyS4 on September 29, 2017, 06:33:47 PM Thanks I will give that a try.
Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: FlyboyS4 on September 30, 2017, 10:50:13 AM Tried using 099 but it didn't give the result I was anticipating. It did show O2-Reg.OFF but when I switched to the measuring blocks to log STFT after a couple of minutes the LTFT started incrementing as normally after clearing DTC's.
I put 099 into the measuring blocks page to monitor the value and it only remained disabled for about 10 seconds before switching back to O2-Reg.ON. Title: Re: Possible to disable LTFTs for long term fueling tuning? Post by: Lost on September 30, 2017, 11:44:35 PM Yeah, it is active only while you are in Basic settings and ch99 is activ.
It stops as soon you enter another ch. It is good only to get en idea if you have tuned idle well. Ie, you choose ch99 in Basic settings, have the car ideling and wb02 ON. If your fueling is perfect it should hold around 14.7. If not, it will go either way. Turn off, go back, adjust needed fueling maps. Do all over again. This is just a check up if you dont have real time tuning tools Cheers. |