You're supposed to let them idle for 30 seconds or so before turning them off, right? (Obviously combined with gentle off-boost driving the minute or two before).
But if you've literally started the engine and simply moved the van about
20-30 metres, not going above, say around 1500rpm at the most, am I right in thinking that the turbo will barely have spun up at all, and you'd be fairly safe just to leave it 2-3 seconds and turn it off almost straight away?What about if you've just started it and literally let it run, idling, for about 5 seconds or so? The revs won't have even changed from tickover - would it be ok to just turn it straight off? As surely it won't have spun up at all beyond the amount it spins at idle speed, and the potential problem of oil supply being cut short won't be a problem as that's only really an issue when the oil is nice and hot, and/or when the turbo's spun up to full boost (around 20-30k rpm or whatever it is they spin at), won't it?
Stupid questions maybe, but please no stupid answers :-)
Peter
-- "The truth is working in television is not very glamorous at all. I just go home on my own at night and sit alone and eat crisps."