> Newer turbo cars have water cooled turbo housings which don't get as hot
> and will circulate water after the engine is stopped to continue cooling
> the hot parts. So they are less likely to cook the oil in the turbo.
What you don't want to do with a turbo is to wing the gas before you
shut down the engine. Just let it idle for a few seconds before you
shut down. When you shut off the engine you are killing the oil feed to
the turbo, and you want to make sure the turbo spool is spinning as
slowly as possible at that point.
A much bigger factor in turbo life these days seems to be pre-cats
needed to meet the US cold-start smog standards, Scoobies that have a
cat between the engine and the turbo (!) and some Audis and maybe others
that wedge the cats right up against the turbo housings, the heat from
the cats (and sometimes bits of disintegrating cat in the case of the
Scoobies) will eventually take out the turbo.
IMO turbo-timers are bling. If you wanted to do something useful you'd
plumb in a pump or pressurized accumulator that'd feed oil to the turbo
for 30sec after engine shutdown.
John.
_______________________________________________
Shop-talk@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $12.96
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|