Care to elaborate a bit more on why? Seems like boost is boost to me...
"Cam Tech - CHP How It Works
Tweet | Turbo Cams
Chris Mays: Turbo cars act very differently than supercharged or nitrous applications. For any given power level, a turbo motor doesn’t need much duration at all. Compared to a nitrous or blower car, the camshafts in turbo motors are much smaller. Since turbos operate off exhaust pressures, the main objective is to minimize overlap to prevent disrupting the exhaust pulses going to the turbo. If you go from blower to turbo but don’t change cam, the engine would have so much overlap that it couldn’t build boost like it needs to. In an effort to reduce turbo lag in street cars, we often use single-pattern or reverse-split cams that have 3-4 degrees less duration on the exhaust side than on the intake side. That’s because you don’t need much intake duration to fill the cylinder, but if you don’t have enough exhaust duration, the turbo will hit a wall at a certain rpm and run out of steam. What we’re doing is changing the exhaust duration to control the rpm range of the engine. Exhaust duration tremendously affects the operating rpm range of a turbo motor. Let’s say you have a mild turbo combo that turns 7,000 rpm with twin 67mm turbos, but then decide to get more aggressive with better heads, twin 88mm turbos, and a 9,200-rpm peak engine speed. To adjust the powerband, you would leave the intake duration the same while increasing exhaust duration."
