Turbo Noise

[Ol_Mate]

G'day all

might sound like a stupid question, but is it normal to be able to hear the turbo spinning down after you shutdown the engine? It goes for a good 20 seconds or so, never heard it on the stock turbo.

i'm a little worried as i have just fitted a new turbo and i'm hoping that I haven't stuffed up the oil feed....

Cheers

[The Mafia]

mine takes about 60 seconds or more to spin down after you turn the engine off.

As long as you drive steady before you shut the car off, this is normal.

Don't rev hard it and turn it of straight away, not a good idea.

[bradsm87]

Sounds like u need a turbo timer. If u want the turbo to last as long as possible, you need to leave the car idling so that oil keeps pumping through the turbo while it spins down then turn the car off.

[Ol_Mate]

sweet, thanks man.

theres a thread about it i just found from 2004, some blokes turbos are still spinning after a minute from shutdown.

[The Mafia]

Sounds like u need a turbo timer. If u want the turbo to last as long as possible, you need to leave the car idling so that oil keeps pumping through the turbo while it spins down then turn the car off.

sorry mate but this is incorrect.

Our Thread starter obviously has made a wise move and bought a Ball bearing turbo. Ball bearing turbos take forever to spin down, and you can hear them especially if you have a 4 inch bell mouth straight to a pod filter.

Bush bearing turbos only take 10 seconds or so to stop spinning.

Mine, even if its only been idling, takes over a minute. Those bearings laced with oil spin very very free, hence the long spin down.

[Wheezy]

Turbo timers are used so that when a car is turned off the turbo isnt really really hot, as this will lead to the oil stuck in the turbo to shear. With oil and water cooled turbochargers this isnt as impreative. But you would be silly to shut off a car you just went for a big thrash in. It does potentially reduce tuirbo life. But the idea as far as Im lead to believe is that in the good ol days of oil cooled bushies being the norm for most snails it lead to serious oil shearing and therefore gunk in the turbo and engine reducing oil flow and lubrication, thus cooling capacity also = dead snail.

well thats what i think anyway