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Old 08-17-2018, 04:48 PM   #43
tomm.brz
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I don't do it because I drive my car in the summer and in the winter.


The UK got neither. Only rain. *cough*

that doesnt make sense. there are other compensations applied against temperature and pressure and if you disable ltft in open loop and scale well the maf, you get a matched afr in summer and in winter and with storm and with hot sun
with ltft enabled? you get random afr every f*cking day : )
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Old 08-17-2018, 04:50 PM   #44
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just disable ltft in open loop and you dont have to care about ltft in 3v area
just scale the maf in open loop and you will always have a perfect afr for a given fuel,without worrying of ltft applied
For me it's purely educational since I want to get deeper into ECU calibration. I understand that there are other methods.
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Old 08-17-2018, 04:55 PM   #45
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Based on your spreadsheet and the data you used what's the point of all of this if your calculated MAF points below 3V are exactly the same as the VGI generated scale? Am I missing something?
Control. If the final fuel-trim is thrown off, all it takes is to adjust one CAL-value left and right of the 3V cell to bring it back in line.

That's one out of many possible ways to do it.



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just disable ltft in open loop and you dont have to care about ltft in 3v area
just scale the maf in open loop and you will always have a perfect afr for a given fuel,without worrying of ltft applied
Wait. You mean the ECU still compensates for ambience temperature?
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Old 08-17-2018, 04:58 PM   #46
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ltft works very good.. for different fuels use and for tunes that need to work off-the-shelf for a large amount of similar cars
if you spent time and resources in scaling the maf the best you can, ltft in open loop become useless to my point of view, just disable it and scale well the maf and afr will always be matched with the target afr
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Old 08-17-2018, 05:09 PM   #47
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ltft works very good.. for different fuels use and for tunes that need to work off-the-shelf for a large amount of similar cars
if you spent time and resources in scaling the maf the best you can, ltft in open loop become useless to my point of view, just disable it and scale well the maf and afr will always be matched with the target afr

Well always thought that the ecu stops compensating for oxygen density as well. Again something learned, thank you! I think I'll give it a try next weekend.
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Old 08-17-2018, 07:35 PM   #48
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can t remember in romraider how it s called, but in ecutek look for the map "airtemp vs airflow compensation"

that s enough to compensate for IAT variations during open loop


in closed loop stft and ltft still work
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Old 08-20-2018, 01:18 AM   #49
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Flashed and went for a drive last weekend. Disabling LTFT in OL was one of the best things to do.
Now the next thing to do is installing the wideband sensor, which is lying on my desk for about 2 weeks now.
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Old 08-20-2018, 09:53 AM   #50
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Flashed and went for a drive last weekend. Disabling LTFT in OL was one of the best things to do.
Now the next thing to do is installing the wideband sensor, which is lying on my desk for about 2 weeks now.
What's the name of the table?

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Old 08-20-2018, 11:35 AM   #51
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For Brzedit, it's Long fuel trim maximum A&B + Long fuel trim minimum A&B

For Romraider I'm just guessing: AF learning #1 limits




Probably a bad idea to zero these tables out on a non-flex-fuel ethanol tune.

Last edited by freerunner; 08-20-2018 at 11:38 AM. Reason: disclaimer added
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Old 08-20-2018, 12:38 PM   #52
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right, you should disable ltft in open loop only if you scape perfectly the maf and use always petrol E0
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