I can see more rear PTO HP giving me the ability to run a bigger wood chipper, and maybe more torque for the PHD, and being able to pull a bigger load like a wider box blade and such, and maybe pushing more snow. Can't see it doing something like increaseg the spreading width for my PTO driven fertilizer spreader, since the rear PTO RPM would still be 540, or am I wrong?
Being pretty unschooled in hydraulics, will the increase in engine HP translate to any increased FEL and 3-point lifting capacities?
You're correct- It'll give more muscle to a PHD and wood chipper. To accurately answer the spreader question - unfortunately it's not that simple. If the load on the spreader (material being spread & parasitic drivetrain loss) is enough to slow the spreader rpm down, then yes, it'll potentially have the power needed to maintain the rpm that is lost, creating more spreading power... However if the spreader is currently (stock) running at PTO 540, and no matter what quantity of material being broadcast doesn't change this, no, the additional power won't increase the spread.
Hydraulics on a 1R are really limited more by the PRV (pressure relief valve). Pressure = muscle & flow = speed. Not modifying the PRV setting (1Rs are usually around 2100PSI) will not make them lift more. The RPMs on the motor aren't going to increase with this change, nor is the volume of them steering/implement hydraulic pump (currently), so this won't improve that.
This increase in power will improve performance when the motor is getting pulled down by load. For example, when I mow with MCS on - even in L, with the 60DMMM running, I'll lose several hundred engine RPM (exceeding available HP) going up my septic sand mound. This addition would likely add the needed power to minimize if not eliminate any RPM loss from this. Keep in mind, this is trying to drive a ~3300lb tractor up a 35-40° slope while still using PTO power to run the deck. If the deck is using 15HP, that leaves ~9HP to drive the tractor (numbers estimated- actual division of load values unknown). Lets assume this turbo adds 10HP to the engine - Same situation: The PTO still gets its 15HP and now the drive gets 19HP to get up the hill, which it might only need 15HP to get up the hill. 😁