Long term fuel trim - Revision history

Nyet at 04:20, 13 July 2007

2007-07-13T04:20:57Z

← Older revision		Revision as of 04:20, 13 July 2007
Line 9:		Line 9:

	The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).		The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).

			==Notes==
			[[LTFT]]s can be monitored via [[VAG-COM]] channel 32.

	[[Category:Fueling]]		[[Category:Fueling]]

Pansgor at 16:30, 10 October 2006

2006-10-10T16:30:47Z

← Older revision		Revision as of 16:30, 10 October 2006
Line 1:		Line 1:
	This is the control of Injection Pulse Time Open (ti) (also called Injection Pulse Width) over the entire range		This is the control of Injection Pulse Time Open (ti) (also called Injection Pulse Width) over the entire range of engine operation. It is primarily calculated at idle or low load mid range engine operation and is averaged
			over time. In these idle/low load conditions the amount of fuel variation is small due to the relatively small amount of air input. The computer monitors the O2 sensor and adds or subtracts approximately 0.001 msec to the injection pulse time (ti) in order to maintain a Lambda = 1. This amount of increase or decrease of the injection pulse width is known as the Adaptation Value. This is the value output by the ECU when reading the live data stream.
	of engine operation. It is primarily calculated at idle or low load mid range engine operation and is averaged
	over time.
	In these idle/low load conditions the amount of fuel variation is small due to the relatively small amount of air
	input. The computer monitors the O2 sensor and ADDS or SUBTRACTS approximately 0.001msec to the
	injection pulse time (ti) in order to maintain a Lambda = 1. This amount of increase or decrease of the
	injection pulse width is known as the Adaptation Value. This is the value output by the ECU when reading
	the live data stream.

	For example: An LTFT of 1 is the factory spec for a new injector's injection pulse width (time open). This		For example: An LTFT of 1 is the factory spec for a new injector's injection pulse width (time open). This corresponds to an LTFT Adaptation Value of 0.0.

	corresponds to an LTFT Adaptation Value of 0.0.
	An LTFT Adaption Value of 0.100 would indicate a wider injection pulse width. This corresponds to a LTFT		An LTFT Adaption Value of 0.100 would indicate a wider injection pulse width. This corresponds to a LTFT of 1.100.

	of 1.100.
	An LTFT Adaption Value of -0.020 would indicate a narrower injection pulse width. This corresponds to a		An LTFT Adaption Value of -0.020 would indicate a narrower injection pulse width. This corresponds to a LTFT of 0.980.
	LTFT of 0.980.

	The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).		The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).

Pansgor at 16:29, 10 October 2006

2006-10-10T16:29:37Z

← Older revision		Revision as of 16:29, 10 October 2006
Line 7:		Line 7:
	injection pulse width is known as the Adaptation Value. This is the value output by the ECU when reading		injection pulse width is known as the Adaptation Value. This is the value output by the ECU when reading
	the live data stream.		the live data stream.

	For example: An LTFT of 1 is the factory spec for a new injector's injection pulse width (time open). This		For example: An LTFT of 1 is the factory spec for a new injector's injection pulse width (time open). This
	corresponds to an LTFT Adaptation Value of 0.0.		corresponds to an LTFT Adaptation Value of 0.0.
Line 13:		Line 14:
	An LTFT Adaption Value of -0.020 would indicate a narrower injection pulse width. This corresponds to a		An LTFT Adaption Value of -0.020 would indicate a narrower injection pulse width. This corresponds to a
	LTFT of 0.980.		LTFT of 0.980.

	The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).		The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).

Nyet at 20:43, 3 September 2006

2006-09-03T20:43:27Z

← Older revision		Revision as of 20:43, 3 September 2006
Line 15:		Line 15:
	The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).		The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).

	[[Category:~~Tuning~~]]		[[Category:Fueling]]

Nyet at 00:30, 2 September 2006

2006-09-02T00:30:28Z

← Older revision		Revision as of 00:30, 2 September 2006
Line 14:		Line 14:
	LTFT of 0.980.		LTFT of 0.980.
	The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).		The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).

			[[Category:Tuning]]

Nyet: Long Term Fuel Trim moved to Long term fuel trim

2006-08-30T00:36:47Z

Long Term Fuel Trim moved to Long term fuel trim

← Older revision		Revision as of 00:36, 30 August 2006
(No difference)

Pansgor at 00:29, 30 August 2006

2006-08-30T00:29:13Z

New page

This is the control of Injection Pulse Time Open (ti) (also called Injection Pulse Width) over the entire range
of engine operation. It is primarily calculated at idle or low load mid range engine operation and is averaged
over time.
In these idle/low load conditions the amount of fuel variation is small due to the relatively small amount of air
input. The computer monitors the O2 sensor and ADDS or SUBTRACTS approximately 0.001msec to the
injection pulse time (ti) in order to maintain a Lambda = 1. This amount of increase or decrease of the
injection pulse width is known as the Adaptation Value. This is the value output by the ECU when reading
the live data stream.
For example: An LTFT of 1 is the factory spec for a new injector's injection pulse width (time open). This
corresponds to an LTFT Adaptation Value of 0.0.
An LTFT Adaption Value of 0.100 would indicate a wider injection pulse width. This corresponds to a LTFT
of 1.100.
An LTFT Adaption Value of -0.020 would indicate a narrower injection pulse width. This corresponds to a
LTFT of 0.980.
The LTFT is also influenced by the [[Short Term Fuel Trim]] (STFT).