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maftcalibrationbywbo2 [2008/01/23 08:09] 76.100.119.159 |
maftcalibrationbywbo2 [2010/05/13 10:45] dmertz |
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- | ====== History ====== | + | ====== MAFT Calibration by Logged WBO2 ====== |
- | The following has been copied from the DSMLink forums. The original (courtesy of Ron Francis) may be found at in this [[http://www.dsmlink.com/forums/showthread.php?t=3529|user support forum thread]]. The text below has been updated to include 1g-specific info, as well as other minor edits. | + | The following has been copied from the DSMLink forums. The original (courtesy of Ron Francis) may be found at in this [[http://www.dsmlink.com/forums/showthread.php?t=3529|user support forum thread]] (registered DSMLink users only). The text below has been updated to include 1g-specific info, as well as other minor edits. |
====== Assumptions ====== | ====== Assumptions ====== | ||
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Example: If the fuel trim is at a constant +7%, add +7% to the 250 Hz slider in the airflow table. Repeat until you are happy. | Example: If the fuel trim is at a constant +7%, add +7% to the 250 Hz slider in the airflow table. Repeat until you are happy. | ||
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====== WOT Tuning (A/F Ratio, WBO2, & MAFRaw) 400hz, 800hz, 1200hz, 1600hz, 2000hz, 2400hz ====== | ====== WOT Tuning (A/F Ratio, WBO2, & MAFRaw) 400hz, 800hz, 1200hz, 1600hz, 2000hz, 2400hz ====== | ||
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* When A/F Ratio is leaner than WBO2 subtract airflow. OR when A/F Ratio is above WBO2 on the graph, subtract airflow to move A/F Ratio down. OR when you want less fuel, subtract airflow. | * When A/F Ratio is leaner than WBO2 subtract airflow. OR when A/F Ratio is above WBO2 on the graph, subtract airflow to move A/F Ratio down. OR when you want less fuel, subtract airflow. | ||
* For each 0.10 A/F Ratio is off, adjust by 1% airflow. | * For each 0.10 A/F Ratio is off, adjust by 1% airflow. | ||
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Example: You make a pull and you get the following results: | Example: You make a pull and you get the following results: | ||
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| WBO2 | 11.0| 12.0| 10.7| 9.6| 9.6| 9.4| | | WBO2 | 11.0| 12.0| 10.7| 9.6| 9.6| 9.4| | ||
| Adjustment | +17%| +25%| +13%| +4%| +3%| -1%| | | Adjustment | +17%| +25%| +13%| +4%| +3%| -1%| | ||
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+ | **Note:** The following calculation method provides a crude approximation of the needed adjustment and depends on the estimated and measured A/F ratio values being somewhere near 10:1. Use ECMLink's correctly calculated WBFactor value instead. | ||
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+ | A simple formula for calculating this is:<code> | ||
+ | (est a/f - WB02) * (-10) = airflow adjustment amount. | ||
+ | |||
+ | Example: | ||
+ | MAFRaw (hz) 800 | ||
+ | A/F Ratio 9.5 | ||
+ | WBO2 12.0 | ||
+ | Adjustment + 25% | ||
+ | |||
+ | (9.5 - 12.0) * (- 10) | ||
+ | (-2.5) * (- 10) | ||
+ | = 25% | ||
+ | |||
+ | (submitted by Omar R. "DSMmaniac_Big_O") </code> | ||
====== Notes ====== | ====== Notes ====== |