up50lut3
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« on: July 22, 2018, 02:12:44 PM »
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hey all,
simple question( may not be such a simple answer) but i have been playing with e85 recently and basically have come down to the conclusion of ( in this one area of topic) krkte for fuel instead of anything else( like fkkvs for example, which is atm set to all 1's)
as of right now i just used lemmeiwinks to add some fueling(+ 14. % in the primary channel) and now have my STFT and LTFT's at -1.6 and -2.3 respectably( with around .81 to .83 lambda at WOT to redline ( without lemmewinks adjustment about +15 on both)
so i was wondering if anyone had any insight as to how to go about adjusting krkte for the change? is there a given formula? i understand how to calculate krkte as a base to get started with injector change, but not much as far as adjusting for so much added fueling.
any insight would be much appreciated thank you!
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nyet
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« Reply #1 on: July 22, 2018, 07:02:13 PM »
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Never use lemmi
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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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woj
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« Reply #2 on: July 23, 2018, 04:34:19 AM »
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My KRKTE scaler (you just multiply) for E85 is 1.403. This is under the assumption that the ECU was originally tuned for E5, which is the norm in Europe, not sure about the rest of the world.
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overspeed
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« Reply #3 on: July 23, 2018, 10:00:58 AM »
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A little formula, adapted from FR
KRKTE [ms/%] = Airdensity x Vhzyl / (0,00167 x AFR x Kfuel xQstat)
airDensity = 1.293 g/dmˆ3 Air density (0 °C and 1013hPa)
Vhzyl [dmˆ3] Piston displacement of a cylinder in dmˆ3
Qstat [g/min] Valve constant for n-heptane
Kfuel = density correction for gasoline/ exotic fuel based on n-Heptane
AFR = Air/Fuel constant at combustion for Lambda = 1.0
Normmk = 0.001667 min/ms Adaptation of units
Note that you must calculate Kfuel from density relaed to n-Heptane.
I use it with sucess in Brazil when tunin E100, E05, etc.
In the past VW calebrated FKKVS to avoid changing KRKTE when Brazil changed to E22 (now it is E27 on regular fuel)
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up50lut3
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« Reply #4 on: July 24, 2018, 07:22:41 AM »
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thanks
let me ask this a different way..... SIMply, how do i adjust krkte based on LTFT's?
just that simple part... dont worry about fuels or anything...thanks!
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nyet
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« Reply #5 on: July 24, 2018, 07:30:34 AM »
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Just follow it exactly (assuming your TVUB is correct).
Add or remove x% from KRTKE depending on LTFT.
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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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lepatron972
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« Reply #6 on: July 25, 2018, 04:31:28 AM »
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Just follow it exactly (assuming your TVUB is correct).
Add or remove x% from KRTKE depending on LTFT.
Hi, just admit that we have changed the injectors, we calculate krkte, but how to find tuvb, I did not have when buying the injectors Envoyé de mon iPhone en utilisant Tapatalk Pro |
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lepatron972
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nyet
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« Reply #7 on: July 25, 2018, 07:48:30 AM »
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If you do not know the correct TVUB you're in trouble.
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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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lepatron972
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« Reply #8 on: July 25, 2018, 07:52:21 AM »
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If you do not know the correct TVUB you're in trouble.
no I do not have it, for cons I have the flow for 2.5ms so I calculated for 1g of fuel at 12.4V Do you think I'm far from it with this method? Envoyé de mon iPhone en utilisant Tapatalk Pro |
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lepatron972
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up50lut3
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« Reply #9 on: July 27, 2018, 06:12:00 PM »
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Just follow it exactly (assuming your TVUB is correct).
Add or remove x% from KRTKE depending on LTFT.
Thank You! im pretty sure it is. cars been within 3% total( stft and ltft) deviation from zero fro about 1 yr now on 93 octane.. just changed to e85 and been making adjustments accordingy just never new how to adjust krkte without using the gueesing game after the ballpark values |
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up50lut3
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« Reply #10 on: July 30, 2018, 12:33:23 AM »
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no I do not have it, for cons I have the flow for 2.5ms
so I calculated for 1g of fuel at 12.4V
Do you think I'm far from it with this method?
tvub is something that you can( base off) get from the datasheets on your injectors.
its not something you can "ballpark" really
Envoyé de mon iPhone en utilisant Tapatalk Pro
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lepatron972
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« Reply #11 on: July 30, 2018, 12:42:10 AM »
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TUVB is the reference time for 1g of fuel if I am not mistaken, I say this because we have the value TIMIN which corresponds to the minimum quantity for lambda 1
Envoyé de mon iPhone en utilisant Tapatalk Pro
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lepatron972
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nyet
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« Reply #12 on: July 30, 2018, 08:11:24 AM »
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TUVB is the reference time for 1g of fuel if I am not mistaken, I say this because we have the value TIMIN which corresponds to the minimum quantity for lambda 1
Envoyé de mon iPhone en utilisant Tapatalk Pro
no TUVB is injector latency. And your definition of TIMIN is wrong as well. |
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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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lepatron972
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« Reply #13 on: July 30, 2018, 08:19:43 AM »
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no TUVB is injector latency.
And your definition of TIMIN is wrong as well.
this can be computed an example it is in french but I found this     Envoyé de mon iPhone en utilisant Tapatalk Pro |
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lepatron972
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nyet
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« Reply #14 on: July 30, 2018, 08:28:53 AM »
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Also it is TVUB not TUVB.
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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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