Selecting of injectors
To determine required injector’s flow rate, you should know the engine's BSFC. BSFC (brake
specific fuel consumption) is the amount of fuel needed to generate 1 horsepower per hour. For
naturally aspirated engines this value is about 5,25cm
3
/min, while for turbo engines about
6cm
3
/min. We select injectors' flow rate to achieve the expected power with 80% duty cycle (DC).
Fuel injector duty cycle is a term used to describe the length of time each individual fuel injector
remains open relative to the amount of time that it is closed and is expressed in %.
Injectors flow rate = (Horsepower * BSFC) / (number of injectors * max. DC)
For example, for 4 cylinder naturally aspirated engine with 150KM power
Injectors flow Rate = (150 * 5,25) / (4 * 0,8) = 246 cm
3
/min
Page 54
EMU
G7
G15
G23
G6
G17
G24
B24
+12V
4 Lo-Z injectors wiring example
15A
4R7 50W
4R7 50W
4R7 50W
4R7 50W
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