running lean after maf and injector install

[scherger_16]

s13 sr20det black top. i sent my ecu up to get it tuned for tomei 555cc injectors and z32 maf with out the car. i put injectors in and maf and car is running lean got wideband aem air fuel and while im at about 15inch vacume till i hit full boost witch is a couple seconds or couple thousand rpm i am getting 16.5 to about 18 or more air to fuel. once i hit boost it will run around 12.2 air to fuel. what could be problem. running stock turbo 10 psi and got walbro 255lph fuel pump recently new fuel filter. what could be my problem

[scherger_16]

is it just a bad tune and need to get retuned or can you do anything to fix this

[jetroy240]

At idle, the ideal A/F ratio is 14.7 that is they call it stoichometric, perfect! W/ modifications like yours, all u can do is to get it rich at idle rpm band, a fuel management is needed or u can increase fuel pressure if u have an adjustable fuel pressure regulator, w/ walbro 255 fuel pump & stock FPR, usually pressure is still at stock levels, 35 psi at idle & 40 psi at WOT (wide open throttle) try 43 psi @ WOT or send the ecu for retune of idle rpm band, if u reduce boost to stock levels @7 psi, I'm sure it will go down below 16-18 but your WOT will go rich more, it's a give & take.

[liquid_cool]

you need sumpin like an (E-ManageBlue ) that lets you add fuel..not take away...per 1000 rpm levels...how it works is by holding the injector open just a tad longer at the targeted rpm ranges..this (in combination) with your fuel pressure regulator will let you tune the fuel map down rite acuratly...allso...that air fuel gauge will fluctuate allot!...dont trust it for detailed tuning...only use it as a warning system for when your crusing ..if it drops to nothing and you hear the fuel pump go..then you know what to do from there..its only a refrence..hope this helped ya.

[scherger_16]

alright im going to take it back and get them to retune the ecu and add a fpr i already have the walbro pump and ill see what happens from there