Haltech F10 Bedienungsanleitung PDF herunterladen (Seite 51)

CHAPTER 7 COLD STARTING AND RUNNING

The Haltech F10 has features to modify fuel delivery to aid in starting and running a cold

engine. The Cold Start Prime map giv es a cold en gin e an initial burst of fuel just as the

engine begins cranking. The Coolant Correction Map modifies the normal fuel injection until

the engine reaches normal op erating temperatures.

7.1 Cold Cranking

At cold crank the air speed at the inlet manifold is very low. As a result a lot of fuel that

would normally travel in the air, sticks to the manifold walls and doesn't enter the engine. The

cylinder chamber temp eratures are also low which leads to p oor combustion. To overcome

these inefficiencies, it is necessary to prime the engin e with a lon g p ulse of the injectors at the

start of cranking to ensure that the en gine has enou gh fu el in the cylinder to fir e. The F10

ECU has a “Fuel Prime M ap” to perform this function.

To access the Fuel Prime M ap p ress Alt – M to op en the M aps menu then scroll to the Fuel

Prime menu item and press enter.

The fuel prime is adjustable at all engine temperatures. This allows the duration of the prime

pulse to be optimised for crankin g across all temperatures. The cold p rime map specifies an

injection time based on engine coolant temperature. The heights of the bars define the time

that the injectors are op en.

Over priming the engine will cause it to flood and not start. To clear a flooded engine, open

the throttle fully and continuously crank the engine. Do not pump the throttle as this will only

worsen the problem.

7.2 Cold Engine Operation

Once started, an engine requires more fuel when it is cold than when it is hot. This is a result

of low manifold and combustion chamber temperatures where fuel sticks to the walls and

doesn't burn properly. The Haltech system corrects for this by using the Fuel Coolant M ap to

supply the extra fuel required at differ ent temp eratures. The F10 will automatically reduce

the amount of coolant correction applied to the engine as the throttle is opened and air speed

increases. The Fuel Coolant M ap should not be adjusted until the Fuel M aps are correctly

tuned at op erating temp erature.

To access the Coolant M ap p ress Alt – M to op en the M aps menu then scroll to the Coolant

Map menu item and press enter.

Access the Fuel Coolant M ap from the Fuel Maps and Set-up M enu. The map defines the

percentage increase in fuel at any given engine temp erature. The F10 is sup p lied with a

default coolant map which may not need to be mod ified. Start the cold engine and adjust the

Fuel Coolant M ap so that the engine idles evenly. You should not touch the throttle while

adjusting this map. Follow the arrow as the engine warms to provide good running mixtures

up to operating temperature, where there should be zero coolant correction.

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Haltech F10 Bedienungsanleitung Seite 51

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