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Hey Guys,
I have a 2014 Sierra with a 5.3 and 72mm turbo with about 8PSI, cast pistons, and crank.
I am having trouble with the fuel rail pressure never really getting to the "Desired pressure", as the RPM rises it gets worse till it misfires and falls on it face.
Any thoughts on how much I can turn up the settings on the Fuel pressure tab? or maybe I am missing something completely.
Any help would be appreciated.
ThanksAttachment 92017
Sounds like your out of fuel.. what’s injector MS, around 7 or higher?
It seems to be out of fuel at relatively low rpm though, I figured that would only happen nearing WOT
I posted the log above
Out of fuel. Time for injectors and a bigger pump. Increasing fuel pressure under fuel pressure tab will only cause more problems than it solves. It throws everything out of whack and you will have to retune it, and eventually you will need new injectors and pump anyway.
I have read LT4 injectors and LT4 pump will help even if I use the same cam. Any advice on that?
The FIRST thing you need is an upgraded LOW SIDE pump. Then you can look at LT4 high side parts as well.