2004 truck cos3 help !

[Trevor81]

Hi all I have a 5.3 with a front mount t-3 t-4 turbo 38mm wastgate 30mm blowoff 3" exhaust , boost ref fpr , ls6 cam and springs. it runs good but hits a wall at 5000 and takes for ever to get to 5800 . any ideas ???

[nevinsb]

Do you have a wide band installed? How much knock retard is there while you are driving?

[joecar]

Check exhaust for blockage.

[Trevor81]

I have an lc-1 . it says 12.25 ish no knock exhaust open . timing at 15~16 ? made it fatter to 11.8 ish still no knock timing at 14 ~15 ??? thanks for the help ? this is a truck so what is the intake good to ??

[Trevor81]

1012210123


this was on the way to work today .