Carsy

I believe it is sensible to idle a turbo engine for a brief period instead of turning it off immediately after running at highway speeds or towing a heavy load. It at least gives the turbo a little time to run down with the bearing oil supply present & for the cooler exhaust gas to normalise the metal temperatures. I do not think it is necessary when idling around town at 60 Km unless you are accelerating like an 18 year old.

Untertürkheim

I always have on all my cars, especially the turbos, since I live at the top of the hill, they get a bit heated on the way home.

cybertechc300

i have turbo cars and i always set my turbo timer to 30 seconds after i run it hard or easy..always good to cool down the turbo and the motor.

GDawgC220

Always a good idea to let a turbo cool down after running it hard/spirited up to your destination. Shutting it off immediately could result in oil cooking on your turbo, leading it to it's death slowly.

Even when I'm easy on my car up to when I park, I give it 10 seconds to cool down. But if I've been in boost, I'll let it run for a minute (or longer, depending on how hard I ran it) before shutting her down.

AMGTestDriverNJ

Similar situation for SC engines? I can't say I always let a cool down period before shutting off...maybe I shoud....

joebenz

you should always let it cool down. i'd recommend a turbo timer if you dont want to sit in your car

AMGTestDriverNJ

haha theres no way I'd put anything aftermarket like a turbo timer in my car. I'd rather sit and wait but I'm sure I wont

joebenz

i wasn't aiming that at you specifically :o

my response was a more general turbo response

in your case, superchargers generally don't have to be cooled. In most applications, the SC has its own oil supply.

Also, the internal bearings don't see nearly as much heat transferred through the intake manifold as a turbo will via the exhaust mani.

trial0r

i used to let it cool after driving really hard but not for regular freeway driving or anything.

451/443=EW

Even on new cars? I know people said to cool down the turbo's yrs ago but I was under the impression that the new cars dont need it any more

GDawgC220

Turbos even on new cars today still need a cool down if driven hard up to your destination or long periods of time. If you run your car hard up to before you stop and it's a oil cooled turbo, by shutting it off immediately the oil will "coke" the turbo aka, "coking your turbo". The extreme high temps will cook that oil that's sitting there (since you've stopped the engine, no flow of oil to cool it down) and cause bearing failure.

By letting it run for a minute or few minutes, the oil cools down the turbo so that when you turn it off after that, the turbo is cool and won't cook the oil. Btw, there is a turbo cool down section in my owners manual.

white_glass_top

he is not talking about an aftermarket turbo, he has the european version of the car C200 CDI, it comes wit a factory turbo, Germans call (Kompressor)