You can't. Its computer controlled
The 2009 Toyota Camry's engine produces 158 hp @ 6000 rpm.
The 2009 Toyota Camry's engine produces 161 ft-lbs. @ 4000 rpm.
The 2009 Toyota Camry-Hybrid's engine produces 187 hp @ 6000 rpm.
The 2009 Toyota Camry-Hybrid's engine produces 138 ft-lbs. @ 4400 rpm.
diagram of rpm in trooper
The 2009 Toyota Camry has 16 valves.
The trip button is integrated in the instrumental panel (where speed is shown, rpm etc). You can activate by pressing on plastic cylinder sticking out of the panel.
The 2010 Toyota Camry's engine produces 169 hp @ 6000 rpm.
The 2003 Toyota Camry's engine produces 157 hp @ 5600 rpm.
The 2013 Toyota Camry's engine produces 178 hp @ 6000 rpm.
The 2014 Toyota Camry's engine produces 178 hp @ 6000 rpm.
The 2007 Toyota Camry's engine produces 158 hp @ 6000 rpm.