Shorter plumbing buys urgency. In V8-powered Mercedes-AMG GT models, the turbochargers sit between the cylinder banks, where inward-facing exhaust ports feed them through compact manifolds rather than sending exhaust around the engine's outer sides. Packaging serves the accelerator. This arrangement, called a hot V, puts the turbines close to the source of their driving energy.
Distance exacts a penalty. When the driver requests more torque and exhaust flow rises, a shorter manifold leaves less gas volume to pressurize before turbine power increases, while its reduced surface area can limit heat loss. Heat does useful work. Retaining exhaust enthalpy, the energy carried by the flowing gas, helps the turbine extract power as exhaust expands through it, accelerating the compressor on the same shaft. Boost then builds sooner. The gain is not chiefly that a pressure wave has fewer inches to travel; it is that the exhaust system has less volume to fill and can deliver energy more directly.
The bargain runs hot. Concentrating turbochargers and exhaust hardware inside the V demands careful shielding, cooling and material selection, while the resulting package also helps keep the engine compact. Lag still survives here. Turbine inertia, compressor sizing, engine speed and boost-control calibration still govern the delay, so a hot V improves transient response without making a turbocharged engine respond exactly like a naturally aspirated one. Geometry cannot abolish waiting. Beneath the bonnet, two turbines occupy the space between the banks, a small architectural concession to the driver's impatience.
