Quote:
Originally Posted by 2-jaffacake-tone
Changing the pump won't affect the map as the fuel pressure is regulated.
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We had this discussion on P1WOC previously...
Pressure doesn't equate to flow, and on boost the walbro pump can deliver a lot more fuel into the same pressure. In practice the Walbro has little effect off boost since the ecu runs closed loop, but on boost the pump will cause more fuel to be fed into the engine due to the fact that the oem pressure reg cannot flow the same amount away from the rails that the pump delivers hence the pressure actualy does rise a bit. Its not a "problem" as such since the reason for fitting the pump should be that the performance is going to be hiked, the std pump is fine if the ecu is std.