fuelsettingshelp
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fuelsettingshelp [2011/05/01 06:32] twdorris |
fuelsettingshelp [2024/03/15 11:16] (current) |
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| This page describes the basic usage of the Fuel tab in the ECU Config section of the ECMLink application. This page is just a dump and reformat of the same information provided in the help file with the ECMLink application. | This page describes the basic usage of the Fuel tab in the ECU Config section of the ECMLink application. This page is just a dump and reformat of the same information provided in the help file with the ECMLink application. | ||
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| Real adj = -5% * (1.0 - 0.8) / (1.6 - 0.8) = -1.25% | Real adj = -5% * (1.0 - 0.8) / (1.6 - 0.8) = -1.25% | ||
| - | Multiple contiguous fuel adjustment points may be selected by holding the Shift key and using the mouse or the left/right arrow keys, and adjusted simultaneously in equal increments using the up/down arrow keys. | + | Multiple contiguous fuel adjustment points may be selected by holding the Shift key and using the mouse or the left/right arrow keys, and adjusted simultaneously in equal increments using the up/down arrow keys or dragging with the mouse up/down. |
| ===== Settings ===== | ===== Settings ===== | ||
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| - | The **Global fuel** and **Deadtime** adjustments are intended to be used mainly to compensate for injectors and fuel pressure that differ from stock. They are applied at all times. | ||
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| + | The **Global fuel** and **Deadtime** adjustments are intended to be used mainly to compensate for injector flow rate and fuel pressure that differ from stock. They are applied at all times. There is also a secondary fuel scale and deadtime adjustment conditionally applied with Full V3 (see the ECU Config->AuxMaps tab). But you have to go out of your way to enable that, so it's not something we'll cover here. | ||
| ==== Global fuel ==== | ==== Global fuel ==== | ||
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| ==== Deadtime ==== | ==== Deadtime ==== | ||
| - | The ECU assumes a nominal 700 microseconds of injector deadtime (for stock injectors). The Deadtime adjustment value is the number of microseconds added to that to compensate for injectors that react more slowly than stock injectors. Typically, the larger the injector or the higher the fuel pressure, the greater the injector's deadtime. | ||
| - | The **Deadtime** adjustment value usually needs some tweaking to get actual air/fuel ratios to match what the ECU intends. Since the **Deadtime** adjustment value is added to the injector pulsewidth, altering it tends to change the actual air/fuel ratio mostly at idle and very little at wide-open throttle. | + | ECMLink provides access to the factory deadtime adjustment table in the DirectAccess tab. The line item is called "**InjBatteryAdj**". This is a table of injector offsets to apply based on battery voltage. The global deadtime field on the ECU Config→Fuel tab is simply added to whatever value is derived from that **InjBatteryAdj ** field. Typically, the larger the injector or the higher the fuel pressure, the greater the injector's deadtime. |
| + | The **Deadtime ** adjustment value usually needs some tweaking to get actual air/fuel ratios to match what the ECU intends. Since the **Deadtime ** adjustment value is added to the injector pulsewidth, altering it tends to change the actual air/fuel ratio mostly at idle where the base injector pulsewidth is small and the deadtime adjustment is relatively large. Deadtime adjustment has very little effect at wide open throttle where injector pulsewidth is already considerably larger. | ||
fuelsettingshelp.1304245948.txt.gz · Last modified: 2011/05/01 06:32 by twdorris
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