SC vs. HEMI - Let the TRASH talk begin!

[UselessPickles]

Reading up on the hot side of the turbos and pipes as well as the future problems of the prodigy though, I'm more swayed towards RIPP with a high boost pulley.

Generalizations about hot pipes on turbo systems may not apply to the Prodigy system. The turbo is intentionally over-sized a bit for various reasons, so that it ends up not spooling much during typical cruising conditions. When the turbo is not spooled up and producing much boost, it's also not producing much waste heat beyond what a plain exhaust pipe would already do. If you're concerned about under-hood heat, then get the pipes ceramic coated. Also definitely put a turbo blanket on the hot-side of the turbo. The turbo kit also removes two sources of heat from under the hood: the catalytic converters. A new high-flow catalytic converter is included with the kit, and it's located about under the driver-side seat, underneath the vehicle (not in the engine compartment).

Off-road driving also does not spool up the turbo much in my experience. When I'm off road, I make use of gearing (4LO, low transmission gears) to keep RPMs up a bit in the mid-range area when I'm climbing stuff, which makes use of all the torque multiplication to keep engine load low, and throttle response good. Low engine load means low exhaust flow, which means minimal turbo spooling, and minimal extra heat from the turbo. The turbo itself, the wastegate, and some of the exhaust pipes are conveniently right behind the radiator fans and in airflow for cooling.


What "future problems" are you referring to?

Pickles, the 6.4L and 5.7L hemis since 2012 use the original trans. I have the same WA580E/NAG-1 that was bolted to my Pentastar. So your assumptions should be pretty good if you're figuring in the original trans dynamics.

Unfortunately, that still doesn't help me, because that's the stock automatic transmission. I currently have no way to model the behavior of an automatic, especially the torque multiplication of the torque converter whenever the converter is not locked up (which will especially affect the initial launch). I can only model behavior a manual transmission, so I'm limited to modeling a theoretical 6.4 Hemi with the Jeep's 6-speed manual (is that even a possible combination?). At least it's consistent for comparison to the rest of the power mods, which can definitely coexist with the stock manual transmission.

I know we're focused here on power but if Pickles has any spare computing time can we get a chart showing where the dollars go for these mods as they relate to power? ... Assume daily driving with a typical commute and weekend trail time.

Not quote sure what you're asking for here. Could you be more specific?

I also still plan to make some more charts illustrating how each option can accelerate in more normal driving situations - not in the best transmission gear for max acceleration. This will allow you to compare, for example, how much acceleration potential is there at 50 mph in 5th gear, and how many gears would less powerful options need to downshift to get equivalent acceleration at the same speed. I can already tell you without any doubt that the Hemi will be the indisputable winner here, and will cause the Hemi to generally "feel" much more powerful in daily driving that all other options (including Prodigy), even if Prodigy's turbo actually makes more power and is capable of faster full-throttle acceleration.