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sn00k
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« on: April 29, 2013, 04:31:33 AM »
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ECU 8N0906018F, 512kb narrowband motronic 7.5.
never played with underscaling before, but i think this car is a candidate for it.
currently at 1.35bar boost, and i noticed im hitting 191 load, and capping out.. from what i can tell this seem to affect the airflow when logging as the MAF signal starts to swing up and down.. (probably due to throttle or timing interventions etc)
what is the smartest way to underscale this so i wont cap out the load?
i wont be boosting over 1.55bar, and preferrably i would want the load to remain the same up to ~160ish or so, that way i wont have to remodel timing etc too much.
ive seen KFKHFM and KFLF mentioned.. but how to do it? other ways?
i remember someone mentioned there was a variable that could be altered to change the whole conversion of the load, in some KISRM discoussion thread..
any advice appreciated =)
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prj
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« Reply #1 on: April 29, 2013, 05:05:39 AM »
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Log ps_w.
Also rl_w does not max out at 191, only rl does, so just log rl_w.
Pretty sure there's just something wrong with your tune, as mshfm is not affected by load.
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sn00k
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« Reply #2 on: April 29, 2013, 05:31:28 AM »
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hmm.. ok, so there is NO point in underscaling this?
i could basically just up ldrxn and request load above 191, only i wont see this in VCDS? (no me7logger used in this car..)
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prj
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« Reply #3 on: April 29, 2013, 06:47:54 AM »
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You are not hitting problems with maxed ps_w at 1.3 bar that's for sure, so yes you don't need to underscale anything. VCDS is waste of time. Have fun tuning blind  |
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nyet
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« Reply #4 on: April 29, 2013, 09:33:38 AM »
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Agree with prj on all counts.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease 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 ex
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sn00k
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« Reply #5 on: April 29, 2013, 10:52:33 AM »
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You are not hitting problems with maxed ps_w at 1.3 bar that's for sure, so yes you don't need to underscale anything. VCDS is waste of time. Have fun tuning blind haha, well.. the cluster/gateway refuses communication with the ecu.. and I myself refuse to hook up a direct k-line to it.. so yes, i might be tuning blind atm, not like its the first time..  first time ive seen the load column maxed out tho, and requested boost dont seem to raise even if requesting higher then 191 load, which is why i asked here about underscaling.. =) how would i raise the requested boost further? car is an 1.8t 150hp engine, stock internals, fitted into a VW Lupo, k04 turbo, 1.3bar boost at 27deg timing.. airflow ~215g/sec atm.. this little green thingy is QUICK, the tune is spot on up to 1.3bar boost.. but we want to boost MORE..! =D theres more flow to extract from this k04..  |
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« Last Edit: April 29, 2013, 11:02:31 AM by sn00k »
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prj
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« Reply #6 on: April 29, 2013, 10:55:37 AM »
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As I said before, your problem is not ps_w or load limit.
And you won't find out what it is by going blind.
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sn00k
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« Reply #7 on: April 29, 2013, 11:03:50 AM »
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As I said before, your problem is not ps_w or load limit.
And you won't find out what it is by going blind.
ok, thanks for clarifying that prj =) ill get to the bottom with this.. hmm.. i just noticed 215g/s is ~4.36v on the MAF, perhaps the maf have difficulties reading higher? or will it operate all the way up to 5v? any limitations in this that needs to be lifted? |
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nyet
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« Reply #8 on: April 29, 2013, 11:06:40 AM »
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ok, thanks for clarifying that prj =)
ill get to the bottom with this..
hmm.. i just noticed 215g/s is ~4.36v on the MAF, perhaps the maf have difficulties reading higher? or will it operate all the way up to 5v? any limitations in this that needs to be lifted?
Just about 5v, KFMLDMX and MLMAX notwithstanding. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease 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 ex
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sn00k
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« Reply #9 on: April 29, 2013, 11:17:29 AM »
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Just about 5v, KFMLDMX and MLMAX notwithstanding.
KFMLDMX is allready corrected.. MLMAX, does it really affect? i know i read a discoussion about this earlier.. http://nefariousmotorsports.com/forum/index.php?topic=769.msg6689#msg6689why im asking is, its set to 152g/s atm, or 550kg/h, and as mentioned we are allready way above that without any problems at all. |
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« Last Edit: April 29, 2013, 11:23:41 AM by sn00k »
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nyet
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« Reply #10 on: April 29, 2013, 11:24:36 AM »
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From looking at the FR again, I can't tell if MLMAX affects anything. Good find. Perhaps prj can comment and confirm?
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease 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 ex
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prj
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« Reply #11 on: April 29, 2013, 11:45:23 AM »
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Just diagnostics from what I can see.
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sn00k
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« Reply #12 on: April 29, 2013, 11:52:21 AM »
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hmm.. ive found something.. my KFMIOP load axis ends at 195.. can this cause the boost to not rise any further?
KFMIRL is requesting 204, and LDRXN allows 204.. alltho from ~191 and up i cannot really see any noticable differences in requested boost.
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ddillenger
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« Reply #13 on: April 29, 2013, 12:03:02 PM »
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It'll go higher, using the last values in KFMIOP for any load >195
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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!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
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nyet
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« Reply #14 on: April 29, 2013, 12:03:54 PM »
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Please. Log. Stop guessing.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease 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 ex
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