I'm stumped!!
 

Recently my evo 9 has been running lean tuning did nothing,,, no matter what we did,,,So I replace new injectors new walbro 255 with new filter and regulator.... Still running lean,,,Im stumped,,,, What else can I check,,,
My mod's are
1000cc RC
HKS,272 EVO_9
WALBRO 255
3" Turboback
Injen UICP with Injen intake with HKS open filter...Stock LICP

DAMN! thats a big turboback! ( sorry i had too )

Maybe those injectors are too big? Im not to great with this but are they scaled properly?

Good Luck

vacuum leak?

maf and/or map, tps sensors, oxygensor sensor too. any cels?

bad gas could do it too, maybe you tune is for race gas or something

injector too big?

Yeah I had them scaled by Scott @ RR. Reason for the 1000cc's was because the stockers where @ 100% Scott said upgrade to the 1000's which I did, now these are @ 100%. Something is wrong.......

Tuned for 91 Octane, on 91 Octane.

hahaha took me a while to figure out what u were joking abuot haha then realized it was a foot marker not an inch marker haha

Stock Mitsu regulator, or an adjustable aftermarket job?

check your throttle body gasket vacuum leaks and butterfly gasket those are really common to be bad from factory.....

Maybe it needs to be retuned. They say 1000cc inj. r hard to tune properly with sotck ecu's.

even with my stock injectors running lean!!! No VAC leaks ehter,, car idles fine,,,
It's just @WOT it lean out,,

Was your tune messed with prior to this? Sounds like it isn't going into closed loop at fuel throttle and is reading the fuel scaling from a map it shouldn't be. But I'm also confused that your 1000cc injectors are going static, but yet the car is running lean. Is it knocking? Maybe you need a new wideband O2.

I also had a simliar issue in my subaru when a coil pack went bad. It was reading lean because the gas from that cylinder wasn't burning and was raw gas, therefore the O2 wasn't reading it. Said lean when it wasn't.

lmao!