Originally Posted by MuSh
Per the owners's manual, it says to let your engine idle for specific amounts of time ( depending on distance and time traveled.) Does anyone follow this? If it is important, why wouldn't they make it to where you can let it idle and just shut off on its own..like a reverse remote start. Maybe it is just me, but when I get to my destination, I want to get out, not sit in the vehicle for 3 minutes or however long.
The primary purpose of an aftermarket turbo timer is to allow your engine to idle unattended by a user a specified amount of time. This would allow your engine, specifically the turbo, to return from elevated temperature levels to normal temperature levels prior to the engine being turned off. This can prevent oil coking in turbochargers that are cooling by engine oil.
The only time turbo timers were used were when you ran your car hard and intended to stop right away. Even so, it was only certain forms of racing, mainly the parking lot autocross type events, which demanded that you retreat to a safe zone after your run. I agree that engines should sometimes be cooled under load - they do it in Formula One and I do it in my Subaru after a long run at more than half throttle / track day / excessive driving at high rpm. There is no reason to use turbo timers or idle unnecessarily under normal operations, at least on the modern 10 year old Subaru engine.
I agree someone should cool under load (by slowing down) or keep the engine idling several minutes after towing a load, driving off-road, driving up a mountain (Mt. Evans / Pikes Peak type drives) or eco-diesel racing on the highway access ramps, but I cannot fathom having to do so for "regular" driving. Such cool-down practices should not be limited to turbo vehicles either.