5 psi boost? S4
 

Did a turbo swap and I'm only getting 5 at boost just started trouble shooting just don't know were to start got an s4 88 American motor all stock

turbo swap into what car? what are the supporting mods?

if everything is stock then boost should be 5.5psi

88 rx7 vert I though when I said s4 it's self explained (88 turbo) and when I said all stock it means all stock turbo parts( tdi map maf upgraded to walboro hp fuel filter

the title says "5 psi boost? S4" so origionaly thought you swaped an s4 engine into something, possibly an S4 car. Then you said "got an s4 88 american motor all stock" meaning that the s4 engine is an 88 but still didnt say what car. Could be swapped into a ford ranger for all we knew :) but yes stock boost is right at 5.5psi.