Question on engine with a turbo...idle time?

[Drew99GT]

This is a little dramatic, but it shows that the turbo is really "working", ie producing boost pressure, when you really give the engine a lot of throttle under load. But it's still gonna be spinning when off the throttle, or at idle, just not very fast.

http://www.youtube.com/watch?v=W_6OG4xQEjQ&feature=related

At idle, it would be something like this:

http://www.youtube.com/watch?v=KF2hhtb-IsE&feature=related

 

[02zx9r]

nice mustang

 

[swalve]

I thought the newer cars had a deal where it would keep the engine running even after you "shut it off" if it needed to cool down the turbo?

 

[Drew99GT]

Originally Posted By: swalve
I thought the newer cars had a deal where it would keep the engine running even after you "shut it off" if it needed to cool down the turbo?


I've never heard of them being installed at the factory, but you can buy aftermarket turbotimers. And depending on how they are setup and for how long they run, it makes it super easy for someone to steal your car!

 

[rjundi]

My other thing to add is the fear and scare of turbo failure dates back to the mid-80's. Turbo's used to fail quickly due to the fact they only had oil cooling. Somewhere in the 80's and definitely 90's ALL turbo's went to water and oil cooling.

The idea of turbo cool down in normal driving is old advice from gramps.

I have own(ed) 4 turbo vehicles using dino(3-4k OCI) and rarely ever idled down thinking about. No turbo failure.

 

[H2GURU]

Actually,the wait or cooldown downtime does 2 functions.
1.Older designs turned at very fast speeds and coking of the engine oil resulted in turbo's oil galley but newer ones are cooled with engine coolant as well avoiding frying the oil.
2. Once you introduce more oxygen (nitrous anyone?) by either a supercharger or a turbocharger to an engine, you raise combustion temps. by quite a bit. The post run 3 minute wait is more to let the temperature even out in the heads of the engine to extend head gasket life and avoid warping. There is no "free lunch".

 

[ikeepmychevytoo]

good motorists warms up and down slowly

If hot, I don't suddenly shut down my plain iron block v6!

 

[BrianWC]

On a newer factory water-cooled turbo car cool down is pretty much a non issue. Sure there are extreme cases where it may help....

I had 168k miles on my 1997 SAAB 900 turbo wen I wrecked it. I kept the turbo after parting everything else out. Looks and spins like new.