[AndyR]

Hi,
does anyone have any info on whether the 335i has any automated turbo protection?. What I mean by this is from having owned previous vehicles with turbos it was recommended that you let the engine idle for a couple of minutes after a spirited drive or long motorway driving. Not sure if this is still the case with the 335i?.

I have a work friend with a megane r26, and that keeps the oil pump to the turbo circulating until the temperature drops to a specified temperature even if the ignition is turned off and the car locked.

Cheers

[JLR1969]

Used to have to do that on my Fiesta RS Turbo in the mid 90s, not sure about modern cars though.

Speak with Birds Automotive in Iver near Heathrow

http://www.birdsauto.com/

[Dubbedoutbimmer]

pretty sure during some reading that the BMW has an electric pump the continues to circulate even after engine shut down

[xenon]

This was more relevant on older cars where mineral oil was the norm. The oil (if not circulated) could break down in the turbo bearings and cause premature wear. With modern synthetic oils and ceramic bearings it's less of an issue although idling the engine a little to allow the turbos to spool down won't do any harm.

[Jay6t9]

Hi,

Found this http://www.e90post.com/forums/showthread.php?t=38856 article on the N54. Look under the "exhaust gas turbocharging" section where it states, electric coolant pump can operate after engine is off to dissapate residual heat and prevent lube oil in the bearing housing from overheating.

Cheers

James

[creepy coupe]

I hear my cars running most of the time, even when I've just backed it out of the garage.

It's common on new cars, my GTi had one.

[doughboy]

That sound about right, the N54 (and most other newish cars these days) has only an electric water pump, but a normal engine driven oil pump.

Reducing engine auxiliary loads to reduce CO2 is the main driver for the leccy pump as it only runs when needed. An oil pump however muct ALWAYS run to maintain bearing pressure, so a mechanical drive is more reliable.

The water coolant, which is pumped throught the turbo casings, will cool the turbos, and the rest of the engine, after a hot stop. This is also important for engines with aluminium cylinder blocks / heads which can warp if they overheat after running.

If you stop after a hard drive, you can here the water pump buzzing away for a while after you stop, its usually drowned out by the engine or the fuel pump buzzing which sound similar.

Although a bit of mechanical sympathy would say just keep it idling for a minute to let the hotspots settle down a bit.

[AndyR]

Originally Posted by Jay6t9

Hi,

Found this http://www.e90post.com/forums/showthread.php?t=38856 article on the N54. Look under the "exhaust gas turbocharging" section where it states, electric coolant pump can operate after engine is off to dissapate residual heat and prevent lube oil in the bearing housing from overheating.

Cheers

James

Thanks very much- exactly what I was looking for!

[dxb335d]

Originally Posted by JLR1969

Used to have to do that on my Fiesta RS Turbo in the mid 90s, not sure about modern cars though.

Speak with Birds Automotive in Iver near Heathrow

http://www.birdsauto.com/

One of these you mean?!