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defender9

Member Since: 12 Mar 2016
Location: Fylde Coast
Posts: 1629

2015 Defender 90 Puma 2.2 SW Keswick Green

Turbo spooling down

I was speaking to a guy the other day after he had pulled up next to me at Cholmondely Castle. He pulled up in an almost new Defender and immediately switched off the engine. I asked him how far he had travelled and said around 70 miles. I said do you not let the engine idle for a short while to let the Turbo spool down, he said "No he never has done".

I was always taught to let the turbo spool down especially after a long run. I wonder how many other folks just switch off after doing a long hot run?

12th Jun 2016 10:21am

Welshsurferdude

Member Since: 23 Feb 2012
Location: Newport
Posts: 2489

I let it spool down after a 60 mile commute every day, specially if its been on the limiter!

2011 Santorini Black USW XS.

2015 Discovery 4.5 Black pack Firenze red XS

12th Jun 2016 10:49am

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6346

2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey

If I were doing 70mph down the motorway and then did an emergency stop I reckon it would be worth waiting.

had I just slowed down, parked up etc then no as I suspect it's pretty much down to speed anyway.

As I don't do 70mph on the motorway I won't be worrying too much.

12th Jun 2016 11:26am

Clive

Member Since: 21 Mar 2014
Location: Littleborough
Posts: 467

2004 Defender 90 Td5 X-Tech LE Zambezi Silver

I have never felt the need and hence never bothered, I've never had a problem with a turbo over a good many years of turbo diesel vehicles.

The fact is that pretty much all modern small vehicle turbos have a very low rotating mass and when trying to create pressure in the system, the mechanical inertia is lost very quickly once the exhaust gas stops flowing and the outlet pressure path is effectively closed off.

12th Jun 2016 11:44am

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5108

2016 Defender 110 Puma 2.2 XS CSW Scotia Grey

Apparently as long as its had a few moments not spinning like a crazy thing, there is no need.

So if you pull up and reverse in or slow down and position yourself in a space, its ok to switch off and walk out.

If you had been hooning it around, did 70 stopped straight away, then yes give it a few seconds. Mike

12th Jun 2016 12:06pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

It's not spooling down that's the problem, it's cooling. Always let them run for a minute or two after a drive to let it cool. Otherwise what happens is oil gets toasted onto the spindle and bearing. Bad news. High temperature shutdowns are the biggest killer of turbos

12th Jun 2016 12:32pm

Hufflepuff

Member Since: 25 Oct 2014
Location: Hampshire
Posts: 727

Its more important in petrol turbo cars which have much hotter exhaust gasses. If the heat is not allowed to reduce, you can cook the oil in the turbo, which can cause it to block the oil paths.

12th Jun 2016 12:45pm

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1782

I make a habit of driving gently and mostly off boost for the last few minutes of a journey.

If I've been hooning around then I'll let it sit a few minutes

12th Jun 2016 12:45pm

Screbble

Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2272

2004 Defender 90 Td5 XS CSW Zambezi Silver

I always let it slow/cool down. Just a habit really, and not a bad one.

It's not a big deal for me to hang on a minute or two whilst I engage the handbrake, put it in gear, close the flaps and switch everything else off.

12th Jun 2016 1:12pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 654

turbo or both I always drive steady at the beginning and end of every journey, I've had several petrol turbo charged audi's each with over 180k miles on them and a few turbo diesels. I've never had a problem.
I only leave them running if I've been towing or had them under load and the turbo has been spooling up.

I've never had a new turbo or turbo related problems in 20 yrs of driving 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

12th Jun 2016 1:48pm

Mash

Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674

I always let the turbo warm up before any harsh acceleration and always let it spoil/cool down with a few mins at idle

90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............

12th Jun 2016 2:42pm

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

so clearing a fault by turning the engine off and on again whilst driving along the motorway isn't good then?

I have to say I do usually let it sit for a little before turning off, not ages but so the turbo isn't running.

12th Jun 2016 7:42pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

No not good

and the turbos always spinning if the engines running.

12th Jun 2016 8:04pm

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