I personally would suggest to go with larger tubing. Larger tubing does take a bit longer to fill, but pre-boost throttle response actually gets better. A good example would be with the old Buick Grand Nationals. You could get a kit that had a larger tube that went from the intercooler to the throttle body, and an over sized weld on elbow for the turbo side of the intercooler. It made a great improvement in the pre-boost power. Any extra time it may have taken to fill the tubing/ intercooler was more than made up for in throttle response pre-boost.
What's the 'how' behind this, interested to know. Wasn't the conventional wisdom in Corky's book to use the smallest tubing that wouldn't result in Mach 1 speeds in the intake tract?
Picture a part throttle condition, MAP is below baro, but between compressor and throttle is more or less close to baro, minus any inlet restriction dP. When you go to WOT, the larger volume will take longer to deplete before the pressure drops, whereas the smaller volume will deplete quickly. By the time this volume is depleted, the turbo should be spooled.
Of course with that logic, every car/motor combination would have its own "sweet Spot", based on many things, including driving style, track layout, ratios, etc, if I understand the principle proposed, which on face value, makes sense.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
