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--- fuelsettingshelp [2014/10/27 07:08]
twdorris [Settings]
+++ fuelsettingshelp [2014/10/27 07:19]
twdorris [Deadtime]
@@ Line 36: / Line 36: @@
 ==== 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.

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