Rubberknees

Rubberknees

Well-Known Member
Full Member
Right thoughts on this please on stopping my P38 and previous turbo diesels I have always let the engine tick over for about 5 to 10 seconds to let the turbo spool down. A mate of mine on seeing me do this said what a waste of time. Am I wrong or doesn't this prevent unnecessary wear to the turbo thus saving expense in the long run. Cheers fellas
 
personally I would too. the rotational speed of a turbo is high so letting it wind down and move oil through it cant do any harm. 5-10 of spinning is a moot point on wear at the rotational speed of a turbine
 
Rubberknees said:
Right thoughts on this please on stopping my P38 and previous turbo diesels I have always let the engine tick over for about 5 to 10 seconds to let the turbo spool down. A mate of mine on seeing me do this said what a waste of time. Am I wrong or doesn't this prevent unnecessary wear to the turbo thus saving expense in the long run. Cheers fellas
Click to expand...

I do the same on the assumption it lets it cool down a bit.
 
What I've been told..
If you stop from high speed when the turbo has been working hard and immediately turn your engine off, the oil flow to your very hot turbo stops. The hot oil can then overheat and leave a residue on the bits is supposed to lubricate, eventually burning on and leading to a world of turbo pain
 
kermit_rr said:
What I've been told..
If you stop from high speed when the turbo has been working hard and immediately turn your engine off, the oil flow to your very hot turbo stops. The hot oil can then overheat and leave a residue on the bits is supposed to lubricate, eventually burning on and leading to a world of turbo pain
Click to expand...
same thing I believed , my mate wont have it. Glad we know better . Cheers
 
I'm sure you won't do much harm of you've just pootled to the shops, just when you've given the turbo a good thrashing!
Equally, it doesn't harm to let it cool for a few seconds either
 
Rubberknees said:
Right thoughts on this please on stopping my P38 and previous turbo diesels I have always let the engine tick over for about 5 to 10 seconds to let the turbo spool down. A mate of mine on seeing me do this said what a waste of time. Am I wrong or doesn't this prevent unnecessary wear to the turbo thus saving expense in the long run. Cheers fellas
Click to expand...
You carry on he will want a new turbo before you do, I always switch every thing off, seat belt off before engine off, couple of years ago chap down the road asked to borrow some tools got to remove turbo from his lads audi because the shaft had sheared he reckoned, my reply was no problem with the tools but I think you will find turbo is knackered, the old boy use to come helling down the road pull up at his dads and switch off, turbo still going full chat and no oil !
 
despite having a heavy right foot i never wind the rpm up until the engine is up to operating temp either.

Keep it below 3000 rpm till warmed up and 'exercising' the engine, transmission and running gear... and a pootle for the last mile or so before shutting down.
 
I always let it wind down and cool for at least a minute, you can actually buy Turbo timers that keep the engine running for 60 seconds after you switch off.
Heat is the killer.
 
vehicles fitted with DPF run very high turbo temps during a regen cycle - cooldown times are even more important when a regen has occurred
 
On a decent engine just let it idle for a few seconds then switch off, turbo will stop before oil pressure drops.
 
I was lead to believe it's not about lack of lubrication on a spinning bearing, more the oil over heating once the flow stops
 
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