Cooling turbos down ?

[J4CKO]

I know conceived wisdom with turbos is to let them cool down before switching off, I remember reading that this was to allow the oil to circulate whilst the turbo, sometimes glowing red can cool down a bit so when the oil stops being pumped around it doesnt carbonise in the bearings.

Is this still as critical ? given that a lot of turbos are now water cooled and most use synthetic oil, does this still carbonise ? do diesel turbos get as hot as petrol ones, my thinking is that you wouldnt want to stick your tongue on it but they dont get quite as hot as diesels tend to run a bit cooler (or do they ?) , but the heat may be more a function of masses of compressed air and than combustion.

I suppose it is good practice to err on the side of caution, but is this advice still valid ? does anyone still use a Turbo Timer outisde of massively boosted jap imports ?

[J4CKO]

Willy Nilly said:

Car engines don't have to work hat hard normally and they are designed to be driven my people that don't know how they work. Normally if you just slow the last mile of you journey down to a gentle canter that should be enough. It is not as though cars are run under full load of hours at a time.

Yeah was thinking your acerage Renault Scenic diesel driver isnt getting the turbo glowing like the one on a 1980's F1 car, thinking more enthusiastically driver modern stuff.

[J4CKO]

Slow said:

My turbo glows red after trying to keep up with a scooby.

Your car is from that era, how did the keeping up with Scoobies go by the way ?

[J4CKO]

TheHeretic said:

V8 Disco said:

I have one on the Skyline; but can't bring myself to walk away from a locked, running car so don't use it.

I just cruise gently for the last few mins to let the turbo cool a bit.

That's what I used to do on the Mr2. Seldom see the point in driving in 'loon mode' right up to your destination.

Yes, it is, for most enfoced by resedential areas being generally 30 mph limits.