why do the turbo's do this
 

well i noticed that the PSI doesnt stay solid all the way to redline, it bleeds off. why is this?

what does it go down too? does it go down by alot?you may have a boost leak ?

mine fd does this, i notice alot is based on how cold or warm the outside temp. is, colder it is better it boosts, i think when i get a fmic maybe it will sort the problem out.
mine only drops a little tho second turbo peaks to 0.8 then holds 0.7 (or under sometimes)



ShaQ

It's a mechanical system - it's not closed loop.


-Ted

well it doesnt go down alot. maybe by 1 or 2psi by 7grand i guess it just depends on the weather

the amount of air used by the engine goes up with load
the turbo is sized to keep up with load up to the med/high rpms range, so at high rpms, it just cant keep up all the way

thats why a bigger turbo at the same PSI will make more power

edit:cold air is denser and easier to keep the engine fed with