Stop/start and turbos

Stallingrad

I've always been a believer in letting a turbo engine idle for a while before switching off the engine, but now have stop/start on the new car which can be great in traffic, but I keep an eye on it and override it when I feel that switching the engine off would do more harm than good.

I have no faith in manufacturers making anything to last longer than 3/5 years anymore so wonder long term will we see a lot more failing turbos, never mind knackered starter motors, as a result of this technology?

cadaliac

Turbos are cooled independently as far as I know.

Thatnastyboy

Its not all about cooling,

The oil pressure drops when the engine is switched off, the turbo may still be spinning at 50,000+ rpm, and getting no proper lubrication,

Agree with the op, I always give a minute or two of idling before knocking off a turbo'd engine

Same when starting up, I just give it a chance to get some lube going while i roll a smoke

Leonard Hofstadter

I think on some of them the car will not shut down if the turbo is too hot, but I agree with your concern - it certainly is good practice to leave the engine run for at least 30 seconds after a hard drive in order to prolong the life of a turbo.

Jimbob 83

No turbo timer = no need imo, unless you have been silly enough to rag it for the last 15 minutes home and then just switch it off

Joe 90

Reminds me of when the Guarda special branch got some R18 turbos back in the 80s. Story was that they wrecked quite a few turbos, probably due to not letting them idle for a minute before shutting down after a hard run.