a stock truck boosts to 16 psi. im not sure who said the 7.3 only wants 12 psi on stock inejctors.
He was very active on a number of diesel sites (just not here) up until about mid-2010.
If you are interested in the "why" behind how stuff works, Google his name on a 7.3 topic that interests you.
As a former engineer, he had a very analytical (and mathematical) approach. I don't always agree with his conclusions, but his math is impeccable.
38r is another story, it can handle up to small hybrids (238/100) with no issues with backpressure.
I'm not sure what you mean here... If you are saying that the 38R doesn't suffer bearing wear/failure due to side loading at high pressures, then I am inclined to agree.
If you are saying the exhaust side of the 38R breathes freely enough to not develop backpressure, then I strongly disagree. Even with moderately-hard driving, I regularly see my back-pressures peg the guage. I thought the 1.0 A/R Exhaust housing was going to solve that problem, but it didn't. What is actually needed is a larger turbine, and the correspondingly larger hole for it.
The van turbo has a 69.85mm exducer, as opposed SD 38 & 38R which both share the same 67.69mm turbine. 2.16mm doesn't sound like much, but after accounting for the center-shaft volume, it is almost a 20% enlargement in the hole exhaust gasses have to escape through.
I've considered many times obtaining a spare 1.0 A/R Exhaust housing and boring it out to 70mm and see if the truck would still run...
And to clarify, by "run" I mean RUN (like a scalded ape).
01 Excursion Limited, GTP38R, 4" Down & Exhaust, Programmed, Custom Dayco 1100 RPM TC, Harpoon, ZooDad, 3-way Headlights, fog-light only / fog-light with high-beam mod, F250 rear springs w/ Bags, 30mm Rear Sway Bar, AIH Delete, IH Water Pump, 205° Thermostat, E99 (all metal) IC, 6.0 (31 Row) Trans Cooler, Nippondenso Starter, Odyssey 65-PC1750T Batteries, Motorcraft GL-360 215A Alternator
Last edited by LurkerX; 07-02-2015 at 05:43 PM.