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Originally Posted by dinar  The part of a High pressure pump used to pressurize the rail is correct. The multiple injection are used to reduce the noise created by DI engine due to fuel exploding, they are called pre injection [used to ignite the fuel slowly ] so the noise is reduced,thats why the new peizo injectors are used on High end cars[they have low response time] and are good for upto 5 injection per cycle. The firmware is deigned so that they only required fuel is brunt including the preinjection.
The peggy back systems are designed mostly to fool the ECM in thinking the pressure in the rail has dropped and so it tends modify the signals to maintain the pressure in the rail, this inturn adds little more fuel in the cylinders.some are designed to modify the signal from the ecm to the injectors itself and vary the injection pulses. |
I was about to suggest the same thing that a piggyback can do the job of injecting more fuel or a remap might do the same but ofcourse that would be limited to the max amount that the injectors can inject fuel plus more fuel means a better fuel pump to maintain a better pressure.