Haltech F10 - Manual (Page 54)

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Method 3
M ethod 3 requires you to access the Fuel Set-up page and adjust two fields: “Barometric
Lock” and “Barometric Pressure Lock at”.
- Barometric Lock should be set to enabled, this tells the F10 that you are
going to lock a particular value in as the measure barometric pressure.
- Barometric Pressure Lock at allows you to set a particular barometric
pressure value. This value should be the average barometric pressure in
which the engine will be operated.
Set the Barometric Pressure Lock at xxxx mBars, where xxxx is the pressure you require, for
example 1000mBars. This setting will force the F10 to assume that the environment always
operates at 1000mBars barometric pressure and will compensate the fuel for 1000mbar
regardless of the actual barometric pressure.
Note: that barometric pressure changes regularly and that M ethod 3 is only a
basic approach at barometric compensation.
Method 2
Note: M ethod 2 is used with engines that are using a M AP sensor to measure
load.
M ethod 2 uses a constant barometric pressure value which is measured by the M AP sensor
before the engine is started. As previously mentioned, the ECU switches the fuel pump on at
start up (fuel pump prime). If the engine is not started, the fuel pump will be switched off. At
this time, if the throttle position exceeds 96%, the measured manifold pressure is stored as
barometric pressure since the manifold pressure in an engine that is not running with the
throttle wide open is the same as the atmosphere. If at start up the engine is cranked before
the fuel pump prime has finished the ECU cannot read the barometric pressure from the M AP
sensor as the engine will create a vacuum in the intake manifold. In this case, the F10 will use
the pressure value as set in M ethod 3. If you have not adjusted it from factory settings, this
will be 1013 mBars.
To complete M ethod 2 follow these steps:
1. Set the Barometric Lock in the Fuel Set-up page to “disabled”.
2. M ake sure the throttle position sensor is properly calibrated. It must exceed 96%
throttle for this to work. Also make sure that the M AP Sensor is set correctly in the
M ain Set-up.
3. Switch the ignition off.
4. Apply full throttle.
5. Switch the ignition on but DO NOT crank the engine.
6. Wait till the fuel pump prime finishes (about 5 seconds) then release the throttle.
The current barometric pressure as read by the MAP Sensor will be programmed