The Greddy Full Auto Turbo Timer was designed to prolong the life of your turbocharger, while adding connivance. GReddy Full Auto Turbo Timers allow a vehicle to idle the engine for a timed period, with the ignition key removed. This conveniently allows the engine oil and turbo center cartridge to cool down properly and prolong turbo and oil life. This can be done by two standard programmable count down presets (P-1, P-2), or the GReddy Full Auto Timer can use it''s two auto timer modes (A-L, A-H). The modes estimate the driving RPM according to the vehicle''s alternator signal and then recommend a count down time.