Auto Shut-off with a turbo

[racer12306]

I learned that turbos should be given a chance to cool off a bit before shutting down. Doesn’t have to be extravagant, such as just pulling into your neighborhood where there’s low load is fine. Don’t shut it off straight from a highway run.

Our 2.0T Wrangler has auto shut-off which seems very short sighted using the logic above. Or am I completely stuck in the past with my logic because these turbos are tiny, water cooled, spec oil that is more geared towards turbo usage compared to in the past?

 

[Pew]

It helps with the general population who probably don't think to such extents. Oddly, my cx5 does it and there's no turbo either but my previous focus did. Evo did not.

 

[andrew_j]

Modern turbos are designed to last a few hundred thousand miles if you change oil regularly . Just drive and enjoy the vehicle.

Where exactly did you learn this from?

My experience from turbos comes from third vehicle all run over 200k with no replacements or issues. Also no special treatment.

 

[OneLonelyBurrito]

Should turbo be given time to cool off if you are pushing the engine to max horsepower and torque for a sustained period of time, yes probably. But in stop-and-go traffic the turbo isn't gonna get hot enough for it to really matter. Plus turbos are all water cooled now, the idea that turbos need to cool down is from when turbos were only oil cooled and oil wasn't as good.

 

[andrew_j]

How often do you have engine screaming top rpm and immediately pull into a parking spot?

Even on highway your engine loafs…..

 

[CKN]

I learned that turbos should be given a chance to cool off a bit before shutting down. Doesn’t have to be extravagant, such as just pulling into your neighborhood where there’s low load is fine. Don’t shut it off straight from a highway run.

Our 2.0T Wrangler has auto shut-off which seems very short sighted using the logic above. Or am I completely stuck in the past with my logic because these turbos are tiny, water cooled, spec oil that is more geared towards turbo usage compared to in the past?

Seeing how turbos have been around since the invention of the internal combustion motor-and are very reliable, yes you are stuck in the past.
Welcome to that club.....you are not the only member of it on here.

 

[racer12306]

Where exactly did you learn this from?

Probably car groups but turbos used to be oil cooled, turn off the engine and stop the cooling and lubrication.

Should turbo be given time to cool off if you are pushing the engine to max horsepower and torque for a sustained period of time, yes probably. But in stop-and-go traffic the turbo isn't gonna get hot enough for it to really matter. Plus turbos are all water cooled now, the idea that turbos need to cool down is from when turbos were only oil cooled and oil wasn't as good.

Makes sense.

 

[Al]

Should turbo be given time to cool off if you are pushing the engine to max horsepower and torque for a sustained period of time, yes probably. But in stop-and-go traffic the turbo isn't gonna get hot enough for it to really matter. Plus turbos are all water cooled now, the idea that turbos need to cool down is from when turbos were only oil cooled and oil wasn't as good.

This. Even on highway, at 70 mph mine may use 1# boost. A few if going up a hill. Does the OP have a boost gauge?

 

[D60]

How often do you have engine screaming top rpm and immediately pull into a parking spot?

Even on highway your engine loafs…..

Every driver every day in New Mexico....

 

[SubieRubyRoo]

This. Even on highway, at 70 mph mine may use 1# boost. A few if going up a hill. Does the OP have a boost gauge?

I’ve seen a hair over 23# on my E30 tune, about 19.7# on 87 octane. All I’ve ever done is pull in, park, and give it 30-60 seconds while I grab my phone and check for work emails. May help that the last ~42k has been using HPL, but my turbos are still in great shape. Most highway driving (by foot, not cruise) never exceeds 1-1.5# even going 70.

In normal use there’s no worries from just pulling in wherever you are and shutting it off.

 

[thescreensavers]

Aren't most OEM turbos setup these days passively cooled? So when you shut down they still are cooling somewhat.

 

[SubieRubyRoo]

Aren't most OEM turbos setup these days passively cooled? So when you shut down they still are cooling somewhat.

If that’s your definition of passively cooled, every turbo ever made is passively cooled.

As long as oil temp is below say 220*F at the bearings/bushings, you should never have an issue.

 

[awguy]

On some cars coolant is pumped through the turbo for about 10 minutes AFTER you shut the engine off.

 

[CKN]

On some cars coolant is pumped through the turbo for about 10 minutes AFTER you shut the engine off.

Ford's EocBoost motors are not blowing turbos. And how many do they sell? The turbo cools after you shut off the motor.

 

[meep]

I learned that turbos should be given a chance to cool off a bit before shutting down. Doesn’t have to be extravagant, such as just pulling into your neighborhood where there’s low load is fine. Don’t shut it off straight from a highway run.

Our 2.0T Wrangler has auto shut-off which seems very short sighted using the logic above. Or am I completely stuck in the past with my logic because these turbos are tiny, water cooled, spec oil that is more geared towards turbo usage compared to in the past?

Different tools are employed to protect the turbos. I have read that some manufactures are able to work designs so that the convection of the coolant keeps it naturally flowing. I don’t know if this is true or who does it. I do know that in my ford, there is a very small electric water pump which kicks in during AS/S to keep fluid moving a little bit. It’s not a lot, like a CPU cooler, but is indeed there and does its thing.

 

[demarpaint]

Turbo or not I'd disable the system. If I had a turbo vehicle I would be even more concerned. Flame suit on.

 

[vavavroom]

Older turbo engines often came with a turbo timer that would keep the engine idling for some time. I believe most modern turbo engines have auxiliary coolant pumps that keep running after the engine has been shut down. After a hard run I let the engine idle for 30 seconds before shutting it off, whether it's a normally aspirated or a turbo engine. I have not yet had a turbo fail.

 

[nomas]

I've never owned a vehicle with a turbo so I thought it was a legit question .

 

[andrew_j]

Turbo or not I'd disable the system. If I had a turbo vehicle I would be even more concerned. Flame suit on.

You cannot disable a turbo in a modern engine. It’s part of engine design , tuning , programming etc . It’s not an afterthought…

 

[demarpaint]

You cannot disable a turbo in a modern engine. It’s part of engine design , tuning , programming etc . It’s not an afterthought…

The OP is referring to stop/start, he called it auto shut off. I'm not saying I'd disable the turbo, I'd disable the stop start system, in a Turbo engine, DI or FI. Especially in a Turbo engine. And a flame suit on in anticipation of some push back and static.