Help somethink wrong

[SCR34M3R]

well i got car tuned on monday and it was going really well they said my o2 sensor was stuffed, woke up next day and over 10psi it just doesnt pull. but it just screems, so i replaced the o2 sensor thinking it was that but still same thing. its a R33 GTS-T with power fc

Cheers

[blind_elk]

The O2 sensor is useless when you are at full throttle, so the tuner was having an enormous lend of you. O2 sensors really only work on cruise.

As for the lack of performance > 10psi, was the PFC tuned for that boost level?

[SCR34M3R]

yer how it is now is how it was tuned

the day i got it was going awesome never drove better

then next day nothing over 10psi its not missing either just dont go ne where

[netrati]

Give us a few more details on your car.

[SCR34M3R]

high flow turbo, injectors, 040 pump, power fc, cams, cooler

[netrati]

Did it always scream? Maybe you have an exhaust leak before the turbine.

[SCR34M3R]

well it just revs as it normally would, or sounds

[netrati]

Do you have the commander? Might wanna see what the inj timing is, MAF voltage, inj duty, knock, etc.

[PHATGTR]

well it just revs as it normally would, or sounds

Does it still run 10psi up top or does boost drop off all together?

If it is only reaching 10psi and staying there all the way to redline then it could be any number of things but I would suggest you have a wastegate actuator problem.

[SCR34M3R]

nah it goes to 15psi and stays there

but just doesnt pull as hard as it did monday after then tune, the knock sensor on pfc is only sayng 7

unless im just used to the power now lol