Turbo shaft lubrication in auto start/stop systems

[yagciogullari]

In a vehicle which has a turbo and an auto start/stop system, how is the turbo shaft kept lubricated when the system shuts off the engine? (since the turbo will keep spinning after the engine is shut off) Is there an electric motor that keeps the oil pump running?

 

[Passport1]

The fix is simply to classify the turbo as a normal wear item just like brakes, wiper blades, tires etc.

 

[ARCOgraphite]

NO. It it will shut down hot after say getting off a highway with no lube and it will cook. But I think there should be a water jacket around the brearing to keep it somewhat cool and that pump can be electric on a separate circuit.

I know S/S has engine killer written all over it. I was shutting mine off at every start, but now I play a fun game of rolling to lights slowly so I don't have to stop. Also slow roll through stop signs in small town.

 

[RooflessVW]

There is oil in the bearing. It behaves just as it would during any other start or stop.

It ain't the 80s anymore.

 

[RooflessVW]

I Inow S/S has engine killer written all over it.

Where are all these dead engines?

 

[ARCOgraphite]

They are coming!

 

[tcp71]

Considering twin turbo engines make up the majority of F150 engines these days, and they are the most sold vehicles in North America as well as having start/stop functions for years now, it’s a non issue. The oils doesn’t disappear from the bearing as soon as the engine shuts off. Turbos have been liquid cooled for years now. No coking or lubrication issues occur.

 

[4WD]

NO. It it will shut down hot after say getting off a highway with no lube and it will cook. But I think there should be a water jacket around the brearing to keep it somewhat cool and that pump can be electric on a separate circuit.

I know S/S has engine killer written all over it. I was shutting mine off at every start, but now I play a fun game of rolling to lights slowly so I don't have to stop. Also slow roll through stop signs in small town.

Not only that … after purchase, I find out the Jeep has a second hidden battery to support this garbage they call technology … (at least we can shut it off) …
Maybe this fall I will start pulling things out of engine bay and find the battery …

 

[RamFan]

They are coming!

Jinkies! Better call Europe and warn them that their 30+ year old engine tech is going to cause mass engine failures.

 

[circuitsmith]

With a little software code added the computer could temporarily disable the S/S when the engine has been recently under high load.

 

[benjy]

even more concerning is the oil supporting the crank!! + if its typical watery xxw20 its even worse IMO. although may owners trade asap after the warranty xpires + the stealers love that $$$$. my 2001 audi TT has an after run water pump to keep oil cooler + running a REAL synthetic ESTER oil like Redline is a smart choice IMO

 

[Zaedock]

even more concerning is the oil supporting the crank!! + if its typical watery xxw20 its even worse IMO. although may owners trade asap after the warranty xpires + the stealers love that $$$$.

This is total nonsense. 20 weights have been supporting cranks since cranks have been around without issue.

 

[meep]

My f150 has a tiny little electric water pump which spins during SS and initially after shutdown. About the size of a hockey puck or large cpu cooler pump

 

[KGMtech]

To be reasonable, in start stop mode, the turbo's aren't spinning at 300k rpms. Any oil that is spec'd for a turbo application with s/s should tolerate the heat for the minutes of no flow seen in s/s situations.

 

[PimTac]

even more concerning is the oil supporting the crank!! + if its typical watery xxw20 its even worse IMO. although may owners trade asap after the warranty xpires + the stealers love that $$$$. my 2001 audi TT has an after run water pump to keep oil cooler + running a REAL synthetic ESTER oil like Redline is a smart choice IMO

What a bunch of nonsense. Do you ever post anything constructive?

 

[Jetronic]

Considering twin turbo engines make up the majority of F150 engines these days, and they are the most sold vehicles in North America as well as having start/stop functions for years now, it’s a non issue. The oils doesn’t disappear from the bearing as soon as the engine shuts off. Turbos have been liquid cooled for years now. No coking or lubrication issues occur.

Diesel turbos are generally not liquid cooled.

 

[honeeagle]

start stop never engages from wot ,there is always a few seconds of idle.
I bet it won't enable if any of a few dozen parameters are not met.

 

[ARCOgraphite]

Not only that … after purchase, I find out the Jeep has a second hidden battery to support this garbage they call technology … (at least we can shut it off) …
Maybe this fall I will start pulling things out of engine bay and find the battery …

My lil' Ecosport has a giant battery and a killer starter - the main benefit of this "tech" /
Then you hit the key in the Winter, that thing winds up like top!

 

[meep]

Not only that … after purchase, I find out the Jeep has a second hidden battery to support this garbage they call technology … (at least we can shut it off) …
Maybe this fall I will start pulling things out of engine bay and find the battery …

you have eTorque? Don’t pull it, you won’t like the results. that sucker integrates with off-the-line launch and performs braking mid-shift instead of using AT clutches. For a soft hybrid they did a remarkable job sorting it out. I believe the motor/alt is also your only alternator. You have a traditional starter and battery for initial and failure-mode (I think) starting.

in the rams, it’s behind the back seat, maybe the size of a large laptop bag.

 

[4WD]

you have eTorque? Don’t pull it, you won’t like the results. that sucker integrates with off-the-line launch and performs braking mid-shift instead of using AT clutches. For a soft hybrid they did a remarkable job sorting it out. I believe the motor/alt is also your only alternator. You have a traditional starter and battery for initial and failure-mode (I think) starting.

in the rams, it’s behind the back seat, maybe the size of a large laptop bag.

Not eTorque, just S/S … I’m not wanting to pull the battery … just check it …