PHEV Turbo leaving running when hot?

Burtenr · Oct 25th, 2021, 14:22

I have an XC60 T8 Recharge on order to replace a current BMW X3 20D. (I suspect I have a long wait for delivery)

To protect the turbo on the X3 20D, I leave the engine running for a short while to allow the turbo to cool down when the turbo is hot.

I assume that as the Petrol ICE in the T8 Recharge has a turbo it should also not be stopped when hot.

How does this work on a Volvo PHEV when the car shuts the ICE down when no longer required, but it could still be hot whilst towing?

As a consequence, are turbo failures common on Volvo PHEVs?

sk546 · Oct 25th, 2021, 15:29

Most modern turbo chargers have very intricate and effective cooling systems that mean they don't need to be treated as delicately as older turbo charged cars did. In addition, modern oil used in turbo charged engines are much more capable of dealing with heat before carbon buildup happens.
These two combined means that with the modern PHEV, the engine can be utilised and switched off almost immediately with no detrimental effect on items such as turbo's and superchargers.
Volvo, I'm sure, would have looked closely into this during the development of the PHEV drivetrain and have installed components to mitigate any of these kind of issues, just like they have a pre-warming system for the engine that prevents any excessive cold wear from happening when the engine is called for but hasn't been run previously.

Chudy85 · Oct 26th, 2021, 09:22

i would like to find if my D4 have some sort of system to protect turbo. I still keep my engine running for little while to cool it down

OldEngineer · Oct 26th, 2021, 09:43

An interesting question.

First and foremost, the cooling system has an electric pump which runs independently from the engine. In Engine mode it will run after the engine has been switched off.
But there are two cooling systems which add some functionality for keeping the battery pack at the right temperature and the rear motor cooled.

What I don't know is how the turbo might be additionally cooled by oil flow.

In any case, after a motorway run, it makes sense to park up after a slow approach to the stop point.

Oct 25th, 2021, 14:22	#1
Burtenr New Member Last Online: Dec 30th, 2021 08:47 Join Date: Oct 2021 Location: Waterlooville	PHEV Turbo leaving running when hot? I have an XC60 T8 Recharge on order to replace a current BMW X3 20D. (I suspect I have a long wait for delivery) To protect the turbo on the X3 20D, I leave the engine running for a short while to allow the turbo to cool down when the turbo is hot. I assume that as the Petrol ICE in the T8 Recharge has a turbo it should also not be stopped when hot. How does this work on a Volvo PHEV when the car shuts the ICE down when no longer required, but it could still be hot whilst towing? As a consequence, are turbo failures common on Volvo PHEVs?

Oct 25th, 2021, 15:29	#2
sk546 Master Member Last Online: Yesterday 20:55 Join Date: Feb 2019 Location: Norwich	Most modern turbo chargers have very intricate and effective cooling systems that mean they don't need to be treated as delicately as older turbo charged cars did. In addition, modern oil used in turbo charged engines are much more capable of dealing with heat before carbon buildup happens. These two combined means that with the modern PHEV, the engine can be utilised and switched off almost immediately with no detrimental effect on items such as turbo's and superchargers. Volvo, I'm sure, would have looked closely into this during the development of the PHEV drivetrain and have installed components to mitigate any of these kind of issues, just like they have a pre-warming system for the engine that prevents any excessive cold wear from happening when the engine is called for but hasn't been run previously. __________________ MY22.5 XC60 Polestar Engineered (455) - Thunder Grey - AAOS [360 Camera\|Tow Bar\|Ohlins\|Akebono] Previous - MY20 XC60 T8 Polestar Engineered - Onyx Black - Sensus

Oct 26th, 2021, 09:22	#3
Chudy85 Volvo family member Last Online: Today 06:41 Join Date: Apr 2021 Location: Peterborough View Photos By: Chudy85	i would like to find if my D4 have some sort of system to protect turbo. I still keep my engine running for little while to cool it down __________________ MY20 V90 Inscription Plus D4, Mussel Blue, Tinted Windows, Towbar ----------------------------------------------------------------------------

Oct 26th, 2021, 09:43	#4
OldEngineer Senior Member Last Online: Apr 15th, 2024 12:30 Join Date: Jul 2018 Location: Esher	An interesting question. First and foremost, the cooling system has an electric pump which runs independently from the engine. In Engine mode it will run after the engine has been switched off. But there are two cooling systems which add some functionality for keeping the battery pack at the right temperature and the rear motor cooled. What I don't know is how the turbo might be additionally cooled by oil flow. In any case, after a motorway run, it makes sense to park up after a slow approach to the stop point. __________________ V90 in Savile Grey with Blond Leather

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