Yes. They took a beating on the dyno for sure. If you watch the vid, you can see them struggling lol.
These eat up 40rwhp give or take compared to a street tire so it’s making steam for sure.
I meant the turbocharger compressor wheels
But from the pic of the video, your intake tube looks, shall we say, suboptimal in its cross-section. A fatter tube will lose less boost when the air is made to turn corners, etc. That energy to redirect the air comes from somewhere. Let's assume just 1 bar of boost. 1200hp is around 2000cfm (before compression,) and this is very ballpark-ish. a 3" cross-section tube will have an 85fps velocity, whereas a 6" tube will have a 21.25 fps velocity, with less energy consumed in turns.
I know it works, and is proven, etc. I am not debating that. I notice all the time how tubing size is ignored in gasoline turbo engines. Gradual transitions (not the face-slam of most turbo tubing-to-compressor transitions) can lead to reduced thermal stress and greater efficiency.
Every erg I could save, I would do so. I know space limitations exist, but so do CAD/CAM programs that can literally fill a space with every last cubic inch being packed with ducting.
I refer to nature for this, and notice the structure of natural fluid passages tends to be organic, smooth, and large, with NO abrupt transitions.
I do not know the effect, in how much control one would have over airflow, but a truly massive throttle butterfly strikes me as being something that is free horsepower due to reduced resistance to flow. Carburetors of old NEEDED a small butterfly due to small venturi size intentionally designed for massive pressure drop to suck fuel into engine, but we don't NEED any small diameter conduits due to the fact that we do not WANT a pressure drop. The ideal system would have ZERO pressure drop right to piston face. We compromise in the intake runners and ports to gain a certain resonance-bracketed cross section, but everywhere else other than the exhaust primary tubes benefits from a truly massive cross section.
One thing that got me on this trail as a kid was Popular Hot Rodding magazine noticed their blown Project X was choking for lack of fuel, and they had to put in larger fuel lines to the carburetors. From an engineering standpoint, larger ducts save ergs.
Besides, fatter air ducts just look sexier.