boost issue

[jbeaton9292]

Ok so im trying to get my car dialed in and i have only 9psi on a e3 16g and it boosts good (for only 9psi) but around 4500rpm it will backfire and fall on its face and i get out fast and its fine again i have currently a wally 255 rewired aeromotive a1000 afpr set around 42psi and just stock 450s im on stock ecu and stock motor upper and lower i cant figure it out please help

Idk if this will make a differance when i bought the car the ecu was shot from bad caps but was repaired by previous owner with the resistor and all that bs but idk how good he did could a crappy fix on there cause this problem maybe

By the way my car is awd 5 speed if it matters

 

[jbeaton9292]

Ok do a boost leak test, and any picks of the ecu job some people do a poor job on replacing those caps.

Lol man ## the only person ever responding to peoples questions anymore and yeah the guy i bought the car from was pretty shady would that ecu problem cause what im having ### i have link on the way to me and im gonna tune the car myself but im not gonna wanna tune for power when i cant get anywhere with it you know

 

[callmesaj]

Boost leak test and a little soapy water. Check the injector insulator seals.

 

[ReivaXVrai]

Possibly blowing out the spark or a fuel cut?

 

[crimsondragon]

Do you have a wideband?