A 6.9 at 3750 rpm is moving 387.37CFM n/a, to get 20 psi we need 914 cfm. My Cummins at 3200 rpm will push 34 psi(Stock Intercooled H1C.) At 3200 rpm, if n/a it would only be moving 282.54 cfm, at 34 psi of boost it's moving 936 CFM, feeding that 936 CFM into a 6.9 would give us around 20.75 psi at 3750 rpm.
im not a real big fan of water cooled turbos, oil in water is bad and a seal in a turbo can go without notice. In extreme application water cooled is a must but, at that stage you are tearing everything down after a run. I havent seen a street application yet that strained the limits of oil cooling in a turbo, atleast in a proper setup that is.
I think you forgot a key calculation of the expansion of the hot exhaust gases
I'm referring to compressor sizing only, hot side calcs are completely unrelated when it comes to that, changing the size of the turbine housing changes the rate at which the compressor increases speed and creates more flow(spool time,) but, it does not affect what the compressor is actually capable of flowing.
I was just making a basic comparison to show that a turbo that is capable of making 34 psi on engine A, while flowing the exact same amount of air may not make that same pressure on engine B
im going to get a hold of a 99 model PSD Garrett turbo and the up pipes and thinking of having a muffler shop bend some pipes to attach to the collector on the exhaust manifold and if need be bend the up pipe to curve along the back of the motor like the psd and have it all welded together. but i am going to make a mount behind the intake to be able to mount the pedestal and have it drain to the valley pan and then go from there.............or would it be better to go for a smaller psd turbo ?
I have not seen a Banks kit or the other T4 kits up close, but I have delbt with the HX, H1C and HY turbo's quite a bit in the past. For those with the T4 flange style turbo kits how hard would it be to bolt one directly up? I have an HX35 and HY35 on my workbench would it help if I posted up some dimentions? My consern is the down pipe. THe compressor housing is larger and won't likely work with the intake hat, but I'm thinking it would be best to go with an intercooler in the long run anyway
If I didn't have the worthless ATS slip coupler up pipe I'd probably be trying to make something work but right now I have nothing to go by except for the turbo itself
the vband is also the same diameter but the hx35 has a thinner lip on the vband. the compressor is bigger for sure but not by a ton.