However, it stands to reason that with more and more BMWs being turbocharged with the new models that this "problem", if it existed, has been nullified, otherwise the handbook would warn you of dire consequences if you didn't idle the engine and of course it doesn't. Furthermore, BMW would be anxiously awaiting warranty claims from drivers who didn't do this and damaged the bearings.
But it simply won't happen as the idling "requirement" is bollocks. Still, do what yo want to do. Originally Posted by Reggie-g Lieutenant General. I'm perfectly well aware that the turbo isn't cooled by airflow, my statement concerned the loss of motion induced airflow around the engine, its component parts and through oil and coolant radiators. A gradual coast-down after a hard drive has a far greater cooling and stabilising effect, than a stationary idle.
Exactly Pete, unless you live or work at the end of a runway, you will have to slow down before you park up, possibly do some low speed manouvring to park etc. Even from idle speeds as the N54 boosts at idle , the turbo will stop almost instantly when the exhaust gases stop, as it has so little mass. All times are GMT The time now is PM. User Name. Mark Forums Read. Page 1 of 2. Thread Tools. Turbo cool down time Please can somebody tell me how long I need to keep the engine running to allow the turbos to cool down?
Appreciate 0 Tweet. Find More Posts by Bozi. Find More Posts by xenon. Find More Posts by briers. Find More Posts by iLondon.
Find More Posts by DavS1. Find More Posts by Reggie-g Find More Posts by m1bjr. Quote: Originally Posted by m1bjr The bearing is water cooled so, even with no oil flow post shutdown, temperatures in the bearings are controlled and rise very little above normal operating temperatures. Originally Posted by m1bjr Xenon - not sure the Mistubishi turbos in the i are ceramic bearing?
Find More Posts by AlwynMike. I read somewhere about the 4g engine having the water lines setup so the heat would circulate the coolant, with no real need to turbotime it. Like the feed comes from a lower area than the discharge, so thermal dynamics would make it circulate after then engine is off. Just don't beat on your car while your looking for a parking spot.
DSMopar Proven Member. Seriously doubt that's the original belt I use my alarm as a TT. I set a time for the car to continue running, when the timer completes- it goes off. Since i have to drive 25mph for about 3 min to get to my house, i turn it off as soon as i get there since i figured that i was driving at like 2k rpm so it should be cool. I don't really think a TT is neccary unless your at the drag strip making hard pulls right before shut off.
But to those that want one for function and not looks, Omega makes a cheap one that gets the job done. Forget the price but I think AMS sells them. And you gotta think thats an old original turbo from the 80's which is not nearly as efficient as today's or even the orginal dsm turbo's of the 90's.
In the dark ages of turbocharging, all turbos were cooled by oil only. Without a water jacket cooling the turbo, the oil would get hot and "coke" up the bearings. Somewhere around the mid 80's manufacturers started adding water cooling to their turbos. In just about any condition you can think of while street driving, the water cooling keeps the turbo from ever reaching temperatures that will cause the oil to coke, especially if you're running good oil. You must log in or register to reply here.
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Question Bad idle after partial cool down. Remember the engine is cooled by the cooling system. The Turbo on the other hand is not cooled as such. The turbo is designed to be part of the hot exhaust system and so is very durable to heat. Lisa RAY: When the dealer told you to run it for 15 seconds, I think he meant you should only drive it for 15 seconds. That would be the best way to preserve the turbo. TOM: What we have here is another anti-turbo argument.
Don't you feel stupid trying to look busy for 15 seconds while the turbo cools down
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