What are these? (pic included)
Dec 22, 2011, 05:53 PM
#1
What are these? (pic included)
Does anyone know what the item is on the bottom right of this bracket that bolts to the firewall? Also need to know if it grounds on that bracket or not. And what the relay above that is for?
Thanks in advance.
Thanks in advance.
Last edited by badev0; Dec 22, 2011 at 05:56 PM.
Dec 22, 2011, 07:23 PM
#3
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Might help :
if you increase the voltage to the fuel pump with better and more direct wiring, it will flow more. Mitsubishi is doing the same thing here. When demand is low, they run the fuel pump voltage through a resistor. When fuel demand is higher, the ECU triggers a relay to run voltage straight to the pump instead of through the relay.
This same circuitry allows the use of much larger upgrade pumps with out adversely affecting idle and part throttle air fuel ratios. On DSMs, when guys would run a Supra or Walbro 255 lph pump on, they would run too rich at low fuel demand times. They would have to run an aftermarket higher flowing fuel pressure regulator. EVOs seem to get away with out needing this and this additional circuitry seems to be why.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
A relay circuit has been added in order to supply the power for actuating the fuel pump directly from the battery. This system is the same as the one used on the 2.0L engine (4G94) of the Lancer.
• A control function has been added to change the fuel discharge volume of the fuel pump in two stages in accordance with the engine load. When the load on the engine is low if the fuel consumption volume is also low, this control actuates the fuel pump at a lower speed. As a result, the fuel return volume decreases, reducing the discharge of fuel vapors
if you increase the voltage to the fuel pump with better and more direct wiring, it will flow more. Mitsubishi is doing the same thing here. When demand is low, they run the fuel pump voltage through a resistor. When fuel demand is higher, the ECU triggers a relay to run voltage straight to the pump instead of through the relay.
This same circuitry allows the use of much larger upgrade pumps with out adversely affecting idle and part throttle air fuel ratios. On DSMs, when guys would run a Supra or Walbro 255 lph pump on, they would run too rich at low fuel demand times. They would have to run an aftermarket higher flowing fuel pressure regulator. EVOs seem to get away with out needing this and this additional circuitry seems to be why.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
A relay circuit has been added in order to supply the power for actuating the fuel pump directly from the battery. This system is the same as the one used on the 2.0L engine (4G94) of the Lancer.
• A control function has been added to change the fuel discharge volume of the fuel pump in two stages in accordance with the engine load. When the load on the engine is low if the fuel consumption volume is also low, this control actuates the fuel pump at a lower speed. As a result, the fuel return volume decreases, reducing the discharge of fuel vapors
