Joined: Jun 2010
Location: Deerfield Beach
Everyone has opinions about this subject. Mine follows. For street applications, turbos and positive displacement superchargers are the best.
A centrifugal supercharger for the street suffers worse lag than a turbo system. Typical street turbo systems can make max boost at 4k and up, while centrifugal SCs need over 5k to make their max boost.
Positive displacement SCs can make their max boost at a much lower RPM and hold it up to redline. Twin-screw designs tend to be much more efficient than roots style, especially when boosting to higher levels. A twin-screw can give you the benefits of quicker max boost and boosting to higher levels.
I personally prefer turbo systems. However, a turbo system is much more complex in plumbing, operation and tuning. Proper sizing is key, allowing you to balance the power capability of the turbo and spool time. Larger turbos can make more power efficiently, but require more energy and time to spool, increasing lag. Also, tuning the wastegate is key to making quick, consistent power. Turbos also have the advantage of "free" HP. All the power made from a turbo comes from waste heat and kinetic energy in the exhaust. If you didn't use it to drive a turbo, it'd just flow out the tailpipe. SCs require power from the crankshaft to run, and can rob 30-50 HP from the wheels. If a SC system and turbo system had the same efficiency and boost levels, a turbo system would outpower a SC system by the level required to drive the SC.
2011 GT Premium
Black/Black w/400A package
GT500 Front Fascia w/BMC Extreme Customs carbon fiber Black Mamba Hood
3.73s, manual, HIDs, Brembos
FRPP/Whipple 624 HP kit, Whipple 123mm Crusher Cold-Air, Kooks LT Headers w/Off-Road Connector
565 WHP / 465 WTQ Mustang Dyno
583 WHP / 480 WTQ DynoJet