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Message: <blockquote data-quote="Shocker98GT" data-source="post: 172007" data-attributes="member: 9697">Couple of reasons really.1: A Roots blower is the only blower that the class allows, twinscrews aren't allowed nor are turbos.2: Nitromethane releases it's own oxygen when burned. The cars aren't starved as much for air (for the power delivered, I mean) as they are fuel, opposed to a gas motor. Running lean is a huge problem, and they cram so much of the fuel mixture into the cylinders that they are just on the verge of the hydraulic lock, they run a 1.7:1 air/fuel ratio (which is stoichiometric for nitromethane). Running lean=burnt metal, running rich=hydrolocking, the tuning is the most important part of a successful run because nitromethane is so touchy. A roots blower has a predictable boost curve. Turbo? Now that'd be nearly impossible or at least VERY hard to get right just due to the nature of a turbo's boost curve. Consistency and predictability is key. Aside from that, the flame front for burned nitromethane is around 7050 degrees F. Turbo system, even one built of super-exotic materials, wouldn't be reliable AT ALL and would be very lucky to make it through the run, probably through staging realistically. Top Fuel cars have enough issues as-is. 3: The exhaust of a top fuel dragster is actually designed to produce downforce, around 800lbs or so, that's why the pipes are turned upwards. Having one turbo exhaust outlet vs 4 exhaust outlets on each bank would complicate this, aside from the turbo being a huge exhaust restriction in itself especially in this scenario. A car making 8000hp can't afford such an exhaust restriction compared to something like a street motor.4: Turbo plumbing, BOV, turbo itself (it would take a MASSIVE turbo to provide that much oxygen) equals more weight, a big consideration for a car that only weighs ~1200lbs.5: Chassis is only rated to 330mph by the NHRA anyway6: Engine of the cars are broken down after every single pass. The tons of piping used to turbo such as car would obviously severely complicate such a matter.That obviously isn't every reason, but some of the more compelling ones IMO..</blockquote>