These rules have included the banning of such ideas as the "wing car" (ground effect) in 1983; the turbocharger in 1989 (these were reintroduced for 2014); active suspension and ABS in 1994; slick tyres (these were reintroduced for 2009); smaller front and rear wings and a reduction in engine capacity from 3.5 to 3.0 litres in 1995; reducing the width of the cars from over 2 metres to around 1.8 metres in 1998; again a reduction in engine capacity from 3.0 to 2.4 litres in 2006; traction control in 1994, and again in 2008 alongside launch control and engine braking after electronic aids were reintroduced in 2001. Yet despite these changes, constructors continued to extract performance gains by increasing power and aerodynamic efficiency. As a result, the pole position speed at many circuits in comparable weather conditions dropped between 1.5 and 3 seconds in 2004 over the prior year's times. The aerodynamic restrictions introduced in 2005 were meant to reduce downforce by about 30%, however, most teams were able to successfully reduce this to a mere 5 to 10% downforce loss. In 2006 the engine power was reduced from by shifting from the 3.0L V10s, used for over a decade, to 2.4L V8s. Some of these new engines were capable of achieving 20,000 rpm during 2006, though for the 2007 season engine development was frozen and the FIA limited all engines to 19,000 rpm to increase reliability and control at increasing engine speeds.