Nice, I actually watched an older Engine Masters episode on the Gen 3 hemi (2017 stock truck motor). The hemi sure does love a bigger cam, except for the loss of bottom end torque.
They showed how the truck intake affects power as well as the VVT operation.
I watched that too. First Hemi they tested, and they still bashed it at the end, saying a small block Chevy does the same for less money. Huh? Then why did Richard Petty win all those races, and competitors accused the Hemi of cheating? Talk about bias!
I bought it for as much low end torque as I can get from a gas motor, for truck application. Because diesels have become too expensive and complex with HPCR, EGR, VVT (variable vane turbo), piezo injectors, and a chemical factory for an exhaust system. Of course the Hemi architecture is most beneficial at higher rpms, since the whole design is for crosshead low flow breathing. There is still some benefit at low rpm, however, and a flatter torque curve than Chevy and Ford showed it.
They also showed exhaust restriction reduction makes no difference in power output. I suppose because the % change is less due to the high pressure compared to the induction air intake? They did show long tube headers boost torque ~ 10%, but this isn't due to restriction reduction - it is due to reduction of cylinder pumping losses.....scavenging exhaust gases and pulling air into the cylinder via exhaust pulses.
www.youtube.com
