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'''Twin-Turbo''', also called bi-turbo by some, refers to a [[turbocharger|turbocharged]] engine, usually larger than 2500 cc, on which two turbocharg ...rbos function simultaneously, unlike sequential twin-turbos. Commonly each turbocharger is mounted to its own individual exhaust/turbo manifold, however on inline-

...r stator travel beyond the normal operating range on the variable-geometry turbocharger to produce engine braking without the noise associated with a compression r

...for 2003 through 2007. Chrysler also produced the world's first production variable valve OHV engine with independent intake and exhaust phasing. The system is ...[[David Dunbar Buick]]. It employs [[pushrod]]-actuated valves [[parallel (geometry)|parallel]] to the [[piston]]s and this is still in use today. This contras

...], [[Variable Valve Timing]] (VVT), the level of boost maintained by the [[turbocharger]] (in turbocharged cars), and control other peripherals. === Control of Variable Valve Timing ===

[[Image:Turbocharger.jpg|right|thumb|350px|Turbocharger Cut-away]] A kathereson '''turbocharger''' is an exhaust gas driven [[compressor]] used in [[internal-combustion en

[[Image:Turbocharger.jpg|right|thumb|350px|Turbocharger Cut-away]] A '''turbocharger''' is an exhaust gas driven [[compressor]] used in [[internal-combustion en

.... The extra horsepower of the HPT version comes from a variable geometry [[turbocharger]]. Both engines meet Euro IV emissions standards.

...|aftercooler/intercooler]] to cool the intake air after compression by the turbocharger further increases efficiency. ...has allowed some enthusiasts to acquire significant power increases with [[turbocharger|turbocharged]] engines through fairly simple and inexpensive modifications.

...[David Dunbar Buick]]. It employed [[pushrod]]-actuated valves [[Parallel (geometry)|parallel]] to the [[piston]]s and is still in use today in some designs (n ...urers, in that it once gave an advantage in engine displacement as well as turbocharger boost pressure to engines based on stock production engines, as distinct fr

...- 736 kW (1001 PS/987 hp) - 2005 [[Bugatti Veyron 16.4]] [[Turbocharger|quad-turbocharged]] W16 engine. ...verado]]/[[GMC Sierra]] 6.6 L [[GM Duramax engine#LBZ|Duramax LBZ]] [[Turbocharger|turbocharged]] V8 engine