mickp

iTrader: (1)

Had my 05 WRX for a month now and here different stories about letting the turbo cool down after heavy use ?.

Not sure whether this is right or an old wifes tale. Is it neccessary ?

corradoboy

AFAIK it's not required on new-age cars. Of course, all engines benfit from letting the oil temp and pressure settle after hard running though.

New_scooby_04

iTrader: (4)

It's most definately NOT an old wifes tale, it's mechanical sympathy!

After heavy use you should always let a turbo car idle for a short while to let the oil dissipate the heat build up in the turbo, just as you should always warm the car up before extending it.

Gentle driving for the last few miles is as good as a cool down, but I always let mine idle for a minute or two, anyway. What's a minute of your time worth?

Regards,

NS04

dazc

I would have thought this was common sense really. Let it cool down properly.

I always drive the last 2-3 miles off boost and let it tick over for a min or 2. Otherwise no oil is circulating around a red hot (literally!) turbo. Not good mate.
Daz

speedy1

The principle is really for ANY turbo car (including diesels).

Tone Loc

iTrader: (1)

I'm at a loss as to why new age cars are different . The turbos are still cooled via the same design of oil and coolant feeds and the turbo runs similar bearings.

After hard use either drive off boost for the last few miles or let it idle for a minute or so. Personally i do both just to be on the safe side. By the time i've parked up, taken the phone out of its holder, taken the stereo out and put the steering lock on its been idling for a minute anyway.

Tony.

corradoboy

Only quoting what I've read on here. As I stated it is advised to let temps & pressures settle after hard running, and I do do this myself. It has been said on here that the turbo's on the newer cars have modified cooling and lubrication negating the need for such precautionary measures, but I'm no expert. That's why I read stuff on here, you gotta learn somewhere

Tone Loc

iTrader: (1)

Personally i'd ignore that little Jem . Last new age car i drove still have the little warining sticker in the car about letting it cool too.

Oil pressure will settle within seconds (within reason), temps will just rise in conjuction with coolant temp.... so not really the point of the excersise.

Tony.

mickp

iTrader: (1)

Cheers guys. Ill try and take it easy during the last couple of miles

jc scoob

your turbo is above No4 piston and gets very hot in turn melts No4 piston so cooling is a must get a timer asap. it's piece of mind

Abbylad

iTrader: (4)

so the heat of the turbo is what melts piston no.4? are you REALLY REALLY sure?

Pavlo

Actually it's not required to the level people think. Scoobs have water cooled turbos, so that keeps the core cooler for a start, then the turbo is intalled so that the heated water acts as a thermosiphon and drawns a contunous flow of water through the turbo.

If you have given it HARD use then it will benefit the turbo to let the engine idle or cruise for a minute or so to minmise boiling of the coolant (it will boil a little anyway when you stop), but it's very rare that you will be pushing that hard and need to stop sudden.

If it were an oil only cooled turbo then it's a different story, as you need to use the oil flow to help cool the core.

paul

jc scoob

50/50 m8 it maybe also be coz its last in line for fuel ??

scoobfan

Oh dear !

jc scoob

please tell all as would like to no the real teky reason for cooling

Abbylad

iTrader: (4)

so what you mean is, you haven`t got a clue, right?
wish people wouldn`t post like they are experts on a particular thing when it seems that they aren`t. some people are easily led on here, so if you`re gonna post stuff like what you`ve said above at least make sure that you can qualify your statements please

jc scoob

lets here it then expert. and no im not a expert far from it mate im just a daft joiner and just saying wot iv heard. so its not heat soak in piston No4 then!!

Moray

**** on it

Abbylad

iTrader: (4)

i didn`t say i knew, or that i was an expert, but i dont post stuff like you posted, so i dont have to be.

Moray

bearings will overheat and turbo will be fuked sooner, hence oil cools on idle prior to switch off. I dont bother unless high speed driving, anway when i am near my house I am doing slow speeds anyway below 1,500 rpm which is better cool down than idle.

jc scoob

at least some cu#t no's sound

Abbylad

iTrader: (4)

erm, yeah! good one. in english please?

i`m guessing you`re getting out of your pram

jc scoob

no english

Pavlo

that is good, but if you listen to the turbo after you switch it off, you will hear it gurgle as the water in it boils lightly. it will continue to draw water through it for over 10 minutes, giving much better protection than you could get if using an oil only turbo combined with a turbo timer or similar.

I find a turbo timer is most useful when starting the engine as I can warm it up without keys in!

Paul