Turbos and cooling down

ScoobyDoo69 · 14 Mar 2011 at 16:40

Do you actually boot it after 2min?

Basher · 14 Mar 2011 at 16:41

ScoobyDoo69 said:
Do you actually boot it after 2min?

I have in the past, yes.

Matt82 · 14 Mar 2011 at 16:57

my cars a liar. when the water temp gauge shows 90* i know its only actually 60* but dont know how long it is until its actually up to temp

ScoobyDoo69 · 14 Mar 2011 at 17:10

Water temperature is not a good indicator of car temperature..

DAIR · 14 Mar 2011 at 22:01

Basher said:
Ok. I normally wait a minute or two before booting it but never bother waiting before turning it off. It's under warranty so rather not waste my time.

Best to be on the safe side imo!!

Whos going to warrant abusive behavior?

Matt82 · 15 Mar 2011 at 07:54

ScoobyDoo69 said:
Water temperature is not a good indicator of car temperature..

and there is no oil temp so its pure guess

Basher · 15 Mar 2011 at 08:25

DAIR said:
Whos going to warrant abusive behavior?

Who's going to know it was abusive behaviour that caused the warranty claim?

DAIR · 15 Mar 2011 at 09:27

Basher said:
Who's going to know it was abusive behaviour that caused the warranty claim?

There are ways of finding out!

Matthew.M · 15 Mar 2011 at 13:23

I can be hooning as hard as I can in my 2.0TDi VAG lump and the engine will still stop/start whenever I pull up at the next set of lights. If the engineers designing it didn't feel the need for any cool down time I'm not going to worry.

Jonnycoupe · 15 Mar 2011 at 13:30

Matthew.M said:
I can be hooning as hard as I can in my 2.0TDi VAG lump and the engine will still stop/start whenever I pull up at the next set of lights. If the engineers designing it didn't feel the need for any cool down time I'm not going to worry.

They designed it as requested by the product strategy board required attributes which in turn was guided by marketing and their desire for a low as possible NEDC CO2 score. This make the car more attractive to company car users NIK tax bands and personal drivers VED band and quotable MPG actually....

Matthew.M · 15 Mar 2011 at 14:14

Jonnycoupe said:
They designed it as requested by the product strategy board required attributes which in turn was guided by marketing and their desire for a low as possible NEDC CO2 score. This make the car more attractive to company car users NIK tax bands and personal drivers VED band and quotable MPG actually....

In which case I'm glad it is a company car on a 2 year lease, and I'm still not going to worry. But interesting nonetheless. Strange though as it monitors so many other attributes that keeps the engine on - cabin temp too high/low, engine temp, reverse gear, battery charge, if the cat is in a regen cycle, surely time since last full boost wouldn't have been hard to implement if it would extend the life of the turbo and also wouldn't affect combined cycle mpg tests? They're not going to thrash it surely?

Anyway after about 20 stop start cycles (minimum!) every journey I'm glad I'm not stuck with one of these cars once the warranty runs out.

Jonnycoupe · 15 Mar 2011 at 14:28

Matthew.M said:
In which case I'm glad it is a company car on a 2 year lease, and I'm still not going to worry. But interesting nonetheless. Strange though as it monitors so many other attributes that keeps the engine on - cabin temp too high/low, engine temp, reverse gear, battery charge, if the cat is in a regen cycle, surely time since last full boost wouldn't have been hard to implement if it would extend the life of the turbo and also wouldn't affect combined cycle mpg tests? They're not going to thrash it surely?

I agree they probably could look at pre stop loading to reduce start stop, but the engineered start stop equipped cars will have a water pump electrically driven to keep the heater matrix warm for stop to maintain cabin heat. If you have a water cooled turbo then that will allow the cooling of the turbo whilst not burning fuel and reduce heat soak into the bearings/oil line and return where oil coking can occur.

Of course most are quick add ons for current products to drop NEDC with no extra pump and hence they prevent start stop at low ambients. Battery charge is one worth monitering aswell otherwise it becomes a reliability issues and potentially a warrenty cost.

Dangerous Dave · 15 Mar 2011 at 14:33

The VAG turbos are water cooled with a pump that runs when the engine is off to keep the coolant flowing they had this before the stop/start cars. My friend's 2001 Ibiza Cupra has one so they have been about for a while.

Jonnycoupe · 15 Mar 2011 at 14:35

Dangerous Dave said:
The VAG turbos are water cooled with a pump that runs when the engine is off to keep the coolant flowing they had this before the stop/start cars. My friend's 2001 Ibiza Cupra has one so they have been about for a while.

Good point. I know the 1.8T has this, quite rare though.

Not sure about the diesels though.

Matt82 · 15 Mar 2011 at 16:21

My S4 had it.

it doesnt turn your turbo into Chuck Norris whatsoever

ScoobyDoo69 · 15 Mar 2011 at 16:34

Matt82 said:
and there is no oil temp so its pure guess

That is why I would say wait a good 10 minutes of normal driving before booting it. Oil takes a very long time to get up to it's full operating temperature.

MikeHiow · 15 Mar 2011 at 16:57

ScoobyDoo69 said:
That is why I would say wait a good 10 minutes of normal driving before booting it. Oil takes a very long time to get up to it's full operating temperature.

That all depends on the car, oil, ambient temperature and how you drive it for those first few minutes.

My ST would reach a decent oil temp within a mile or two of driving, and that is when it would get a thrashing.

ScoobyDoo69 · 15 Mar 2011 at 16:59

What do you regard to be a decent oil temperature?

MikeHiow · 15 Mar 2011 at 17:08

~70c is enough for me.

Jonnycoupe · 15 Mar 2011 at 17:14

Popcorn.