SAFC issues help! Going really lean after install (long post)

I mean if 750s was too much fuel and even s2s is too much fuel. Why did the car feel so much better at the same boost with the 750s than it did with the s2s? Thats what made me think it was the injectors but if the 750s went lean at 4500 again then it can't be. It was only 10% pulled across the board. Idk I'm just talking now lol

 

See if you can borrow a Scangauge from someone. Monitor the fuel trims to see what happens at around the 4500 rpm range when the vehicle does go lean.

Is your wga on or off pcm controlled boost?

Also if you do so happen to borrow a Scangauge, check ignition advance and knock retard.

Upper O2 Sensor (Upstream) maybe needs to be replaced and is getting false readings. Its located on the O2 housing.

I would also check for exhaust leaks.

 

borrowing a scan gauge is the hardest part so when I can i will check those fuel trims. The drb read the knock and if the boost is the problem I am sure I am getting some, I didn't check, was keeping my eye on the afrs. My wga is off pcm controlled boost, although touching that line could have screwed it up especially since we cranked it and the boost didnt change. If my upper 02 was bad than why would I be getting similar lean readings on a good 2nd 02 from an after market wideband? I am boost leak testing Wednesday, will double check all the possible leaks

I've had numerous people say that I am not on stock boost level, because cranking the wga does nothing, I am going lean, my piggy back is tricking the ecu by bypassing the MAP which plays a role in my boost pressure and only showing stock boost. I am going to crank that all the way back down, and redo all the lines and check for leaks. I just had money to buy a wideband so I will buy a scangauge next paycheck hopefully. We'll see. Hopefully that works