and a hell of a oil cooler because the piston squirters are going to be doing alot of work to try to cool the pistons and at 400WHP i bet those pistons swell so tight in the bore essentially siezing the motor and it shatters rods from that issue our pistons for our motors swell alot because of the compression and well ricardo cup design aka IDI our pistons get hot fast and literally melt or swell and sieze in the bore shattering rings or making rods shoot out the side of motor 400whp is insane for a tow rig for our motors. The point is would take a ton of money and a ton of 1 off custom made parts to allow this I tackled alot of it including custom made steal top pistons with wrist pin raised 13 or 15 thousands cannot remember exactly and they came out well over $500 a piston and custom ring grooves which were also a upgrade. I used larger rings with more tension and more modern alloy designed more for durability / longevity / better sealing and custom performance power stroke rods modified to my use and power stroke crank and rod bearings along with alot more and I never got near the 400whp. I got 325WHP / 720ftlb of torgue and that was with a custom HX50 pushing 28psi PSI is not everything CFM / density is very important as gale banks says the turbo is out to lunch. I spent alot of time / money designing and building that motor still have it and it runs like a beast but I would not dare trust it for towing and that motors has well over $10k in it so he needs to rethink his goals
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The HX50 can make more air density with less charge heating issues than a HX35/40 can meaning less PSI is needed the HX35/40 even with crazy intercooling had to run much higher boost pressures to deliver 1/2 of what it took for the HX50 again I maxxed out 28psi on the HX50 to get much better density / CFM than a HX40 at 35psi+ could deliver. the fact is got more density / CFM at 23psi with the HX50 than the HX40 did at 33psi. So yes the HX50 took a bit longer to spool but that was easily compensated by adding more fuel aka HEAT to light off the HX50 earlier yeah she was coal rolling for 10 seconds but it cleaned out quick and let me tell you when the HX50 hit you better hang on beacause either tires were spinning all of them dually 4x4 or it shattered the rear end / drive shaft. I played that game several times in fact my rear dif exploded on the dyno ( dana 80 4.10 gears ) when I hit the 325WHP / 720ftlb of torgue ( numbers were likely higher but the dif exploded and couldn't take it ) so I can say I played with these motors and found theyre limits and the limit in which I would spend money on them to get stupid results.
when the HX 50 came on it was violent I have to say it rivals nitrous shots on our IDI's yes I did that also and propane injection along with water **** injection I did alot of crazy stuff years ago there is a reason why I have several of these trucks / motors and a barn full of just parts from my sacrificed motors
I found many of theyre limits the hard way and expensive way. I sacrificed like 15+ of these engines just experimenting and finding theyre limits and I also then designed and fabricated ways around them with a few other people.