So I know the hx35 isn't recommended to be run above 35ish psi. I'm at 34 maxxed out right now, with 3/16" of timing. I'm looking to install cooler tubz, as well as a 7.3 IC. Both of these will lower boost numbers. If they lower to, lets say, 30, and I was to get injectors and go back upto 35.. Would this be running it out of its efficiency range or overspeeding it due to it pushing more air at the same boost levels?

 

I don't see whats wrong with 35psi.

 

If I remember reading correctly, past 35 is out of thefficiency range and is just blowing hot air.

 

It is always blowing hot air, anytime you compress air it heats up. Thus the intercooler to transfer heat from the charge air lowering intake temps, egt temp but more importantly a more dense amount of air. The only limit I know of is for the head gasket, at 45.

 

Yes but turbos have an efficiency range, push out of that and it's pushing superheated air that the IC can't cool well enough, plus risk of overspeeding. I thought the hx35's efficiency range "limit" as such is about 35 psi. Head gasket limits can vary as well, and have more to do with drive pressure than boost.