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quickieafsetup [2009/10/29 05:06] twdorris |
quickieafsetup [2010/02/01 09:01] twdorris |
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====== Quickie A/F Setup ====== | ====== Quickie A/F Setup ====== | ||
I was asked to store this post away somewhere for future reference. For now, I'll just dump it in here as is and maybe come back later and edit/expand upon it. It's really just documentation of my personal process for running through a "quickie" setup with a new car using DSMLink. It's intended to help the user get a handle on whether fuel delivery and airflow metering all make sense. | I was asked to store this post away somewhere for future reference. For now, I'll just dump it in here as is and maybe come back later and edit/expand upon it. It's really just documentation of my personal process for running through a "quickie" setup with a new car using DSMLink. It's intended to help the user get a handle on whether fuel delivery and airflow metering all make sense. | ||
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====== Process ====== | ====== Process ====== | ||
- | First, if you don't already know what fuel trims are or how they're used by the ECU, then I would strongly recommend you start by reading through [[FuelTrimUpdatePoints|Fuel-trims: What They Are and How They Work]]. Knowledge of this fundamental concept is key to understanding everything else below. | + | First, if you don't already know what fuel trims are or how they're used by the ECU, then I would strongly recommend you start by reading through [[FuelTrimUpdatePoints|Fuel-trims: What They Are and How They Work]]. Knowledge of this fundamental concept is __**key**__ to understanding everything else below. |
- | I generally monitor ''CombinedFT'' and ''AirflowPerRev'' at idle. I want to see ''CombinedFT'' cycling around +/- 5% or so. You'd expect to see 0.24-0.26 g/rev for ''AirflowPerRev'' at idle ((Automatics and 2.3L engines will generally have a slightly higher AirflowPerRev value at idle.)), but I don't get too caught up on that if the fuel trims are inline with global fuel settings that make sense for my injectors. | + | I generally monitor ''CombinedFT'' and ''AirflowPerRev'' at idle. I want to see ''CombinedFT'' cycling around +/- 8% or so. You'd expect to see 0.24-0.28 g/rev for ''AirflowPerRev'' at idle ((Automatics and 2.3L engines will generally have a slightly higher AirflowPerRev value at idle.)), but I don't get too caught up on that if the fuel trim is inline and you have global fuel settings that make sense for my injectors. |
If fuel trims at idle are not where I want them, 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 trims at idle are not where I want them, 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. | ||
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Next I do some cruising around, again watching ''CombinedFT'' to see where it likes to hang out. I don't really have a good airflow figure to watch for at cruise because it depends much more on throttle position and road inclination than idle airflow does. So it's hard to pick a value there. I just watch ''CombinedFT'' and try to adjust airflow sliders or fuel settings (primarily deadtime and/or global fuel sliders) accordingly. I would consider airflow slider adjustments if I know I have reason to suspect airflow to be off a bit (maybe I'm dialing in a hacked MAF or something). I would focus on fuel settings more if ''LTFT'' were off for both idle and cruise. | Next I do some cruising around, again watching ''CombinedFT'' to see where it likes to hang out. I don't really have a good airflow figure to watch for at cruise because it depends much more on throttle position and road inclination than idle airflow does. So it's hard to pick a value there. I just watch ''CombinedFT'' and try to adjust airflow sliders or fuel settings (primarily deadtime and/or global fuel sliders) accordingly. I would consider airflow slider adjustments if I know I have reason to suspect airflow to be off a bit (maybe I'm dialing in a hacked MAF or something). I would focus on fuel settings more if ''LTFT'' were off for both idle and cruise. | ||
- | **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]]. | + | **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]]. |
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. |