Engine and turbo setup:

Closed deck H22, Golden Eagle sleeved
89mm 9:1 CP pistons
Eagle rods
Skunk2 Pro1 cams
Supertech flat-faced valves
ID1000's
Walbro 255HP
Old-school DRAG top mount tubular manifold
Tial MVR 44mm
Comp twin disc + quaife diff

Running a PTE 3431e journal bearing, .63 a/r exhaust. Looking to hit 450whp, wondering if thats reasonable on this turbo. I've heard they tend to max out in that range on b-series, not sure how an H would fare since we're kinda the black sheep of boosted honda motors and I cant seem to find anyone running a similar 57 trim. Looking for a fun street car with a lot of torque and minimal lag, and I think I've got something here that will meet that. Thoughts?

 

Its airflow based, not engine based. you're maxxed out at 430whp with that turbocharger, and even then, that's with a larger turbine housing than your .63A/R

 

ok, thats where I get a little confused. For example, 18psi with this turbo will make different power on a GSR motor, vs my H22, which leads me to believe that psi is also not related to airflow in this case. Yet people tend to say turbos get maxed out at a certain boost pressure. Maybe some truth to both sides?

How much boost would I need to run to hit that? I'm just looking to break 400. I'm planning on just running it off the wastegate so I'd rather buy one spring and be done with it

 

Turbos max out at the same power level, with different boost pressure levels. What takes a Subaru 25psi to max out 430whp, may take a honda only 21psi to do the same thing, based upon the efficiency of the engine itself.

57trim for 400whp could range from 20-23psi to reach. That's where you have to dyno to do it.