quickieafsetup
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quickieafsetup [2010/02/08 08:19] twdorris |
quickieafsetup [2024/03/15 11:16] (current) |
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| Knowledge of this fundamental concept is __**key**__ to understanding everything else below. | Knowledge of this fundamental concept is __**key**__ to understanding everything else below. | ||
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| ===== Idle ===== | ===== Idle ===== | ||
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| If fuel trim at idle is not where I want it, I either use the lower airflow sliders (log ''MAFRaw'' to see where to make adjustments) or I use deadtime to tweak things. If I'm running SD, I'll use the SD VE table instead of the airflow sliders. | If fuel trim at idle is not where I want it, I either use the lower airflow sliders (log ''MAFRaw'' to see where to make adjustments) or I use deadtime to tweak things. If I'm running SD, I'll use the SD VE table instead of the airflow sliders. | ||
| - | Whether I make changes to airflow/VE or deadtime usually depends on whether ''AirflowPerRev'' is inline or not. If ''AirflowPerRev'' is off from the expected value in the opposite direction from ''CombinedFT'', then I adjust the lower airflow sliders more than deadtime. If ''AirflowPerRev'' is around what I'd expect, I might focus on deadtime instead for idle fuel trim adjustments. Just keep an ear out for little misfires at idle that can sometimes be introduced with deadtime adjustments, particularly if the injectors are not well matched at low pulsewidth. | + | Whether I make changes to airflow or deadtime usually depends on whether ''AirflowPerRev'' is inline or not. If ''AirflowPerRev'' is off from the expected value in the opposite direction from ''CombinedFT'', then I adjust the lower airflow sliders more than deadtime. |
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| + | If ''AirflowPerRev'' is around what I'd expect, I might focus on deadtime instead for idle fuel trim adjustments. Just keep an ear out for little misfires at idle that can sometimes be introduced with deadtime adjustments, particularly if the injectors are not well matched at low pulsewidth. | ||
| ===== Cruise ===== | ===== Cruise ===== | ||
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| ===== Automated adjustments ===== | ===== Automated adjustments ===== | ||
| **NOTE:** With the release of V3, we've added a more "automated" method of doing the above idle/cruise dialing. Be sure to read about it on our [[v3mafadjcombft|MAF Adjust page]]. Or, if you're running SD, read the [[sdveadjcomft|SD Adjust page]] or the [[sdveadjsdratio|SDRatio Adjust page]]. | **NOTE:** With the release of V3, we've added a more "automated" method of doing the above idle/cruise dialing. Be sure to read about it on our [[v3mafadjcombft|MAF Adjust page]]. Or, if you're running SD, read the [[sdveadjcomft|SD Adjust page]] or the [[sdveadjsdratio|SDRatio Adjust page]]. | ||
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| ===== WOT ===== | ===== WOT ===== | ||
| - | Then I do a few pulls and look at ''BoostEst'' around 5500-6000 RPM to make sure it matches with what the gauge was reading. Some deviation is expected, especially as revs increase. But more than a psi or two and I feel like I want to tweak the airflow sliders some more. | + | Then I do a few pulls and look at ''BoostEst'' around 5500-6000 RPM to make sure it matches with what the gauge was reading. Some deviation is expected, especially as revs increase. But more than a psi or two and I feel like I want to tweak the airflow sliders some more. You can calculate the amount to move the sliders if you understand absolute pressure and how to calculate scale factors. Otherwise, just lower the MAFComp sliders if BoostEst is above measured boost or raise MAFComp is BoostEst is lower than measured boost. |
| - | At that point, I'm usually pretty happy with the setup and can start tuning. | + | Once that's done, I'm usually pretty happy with the setup and can start tuning. |
| ===== Other checks ===== | ===== Other checks ===== | ||
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| In all cases, I constantly do cross checks. For example, if ''CombinedFT'' at idle is positive by a good bit (significantly more than 5%) yet ''AirflowPerRev'' is also higher than expected (0.24-0.26) and my deadtime has already been increased a good bit from where I'd expect it, then I have to question what's going on because the numbers don't add up. Maybe fuel pressure at idle is lower than what I assumed it was, for example. | In all cases, I constantly do cross checks. For example, if ''CombinedFT'' at idle is positive by a good bit (significantly more than 5%) yet ''AirflowPerRev'' is also higher than expected (0.24-0.26) and my deadtime has already been increased a good bit from where I'd expect it, then I have to question what's going on because the numbers don't add up. Maybe fuel pressure at idle is lower than what I assumed it was, for example. | ||
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quickieafsetup.1265635142.txt.gz · Last modified: 2010/02/08 08:19 by twdorris
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