My old stock fuel pump died on me and I replaced it w a Walbro 255. I'm running a stock P73 ECU w factory ITR FPR. I was wondering w the added amount of Fuel pressure, how would that change my F to Air ratio. Anyone had experience maybe on the dyno or atleast w a wide band O2 that could tell me the changes it made.. Thanks!

 

No change required. The 255 pump will just ensure that the fuel is there when needed, the fpr regulates the amount of fuel pressure and the injectors controls the amount of fuel going into the engine. Stock b series injectors flow at 240 or 260 i cant remeber but that is the flow rate, the can't flow more than that so you dont have to worry about changing fuel maps.

p.s. Steve is the man.