I definately agree with King here. Boost is addicting and you'll want more, then turn it up to 8-10 psi, drive it around like that, something breaks, you end up upgrading your pistons/rods/building custom IM/bigger injectors/MS or standalone... And that is before you get to start your fun with gearbox problems. I obviously haven't gotten that far yet, I've had 10psi on T4 turbo on stock internals with custom IM and extra injectors. This setup did net me 290whp and burnt valves after some time of having fun. That is when my setup started to come more as a work than hobby.4-5 psi Id say is the good safe, long term daily driving bet.
Go up higher and you start breaking stuff and having problems.
also this right here make no absolute sense to me.Pressure is pressure, you have a given cylinder size, and a given pressure, your going to make X amount of force which is then converted to horsepower.
The CFM of the turbo is just going to litigate how soon you get to the magic number.
Of course a t25 isnt going to make 300 whp on a KLDE, because its never going to reach 10psi. It simply cannot flow enough CFM to reach that point before the valves on the heads open.
Your comparing Honda 4 cyl motors to Mazda 6 cyl motors, Apples to oranges
if the turbo can spool the same power band, but all things considered the turbo wont have the parasitic loss of an engine trying to drive a supercharger.Would 7psi on a supercharger setup make the same peak power as a turbo running at 7psi? Considering the motors are in the same shape and all other mods are identical.