Auto stop-start feature BAD for turbo

I’m trying to wrap my head around this auto Stop-start feature on the new 4th gen engines. Stopping the engine constantly can’t be good for the life of the turbo. I was always under the impression turbo vehicles should be left to idle for a few min after driving the vehicle before shutting it down. What’s your guys thoughts on this?

 

If it is a problem, then Toyota should delay the auto off until the engine can safely turn off without cooking the turbo. I'd guess they thought of that, and either it isn't a problem or they have countermeasures in the software auto on/off control.

 

You’d really hope they did

 

In any case if it is like the new Tundras the feature is sensitive to the pressure on the brake pedal. It is very easy to keep the engine from shutting off by not pushing the brake pedal too hard. The Tundra pops up a message to remind you that if you want the engine to stop to press the pedal harder. Of course, you can also turn the feature off via a switch. But there is no need to do that. Just be mindful of the pressure on the brake pedal once you are stopped.

 

Yeah that’s true our Toyota Corolla cross is like that. But sometimes just can’t help it and push the pedal to hard. It’s a non turbo engine though so I don’t mind it as much

 

Sure, but that's not the end of the world or anything. ;-)

 

I just think the gain/loss of constantly turning the engine off is completely unnecessary. Saving a tablespoon of fuel and putting extra wear on the engine

 

I didn't do this, but have been tempted to fit a disabler to our 2022 Corolla Cross ...
https://www.aliexpress.us/item/3256801895012105.html

 

I’d be Leary of installing an aftermarket System like that

 

Someone better alert the engineers who definitely didn’t think of this

 

Engineers aren’t perfect bud. Look at the hundreds of issues vehicles have accross many manufacturers . Most those issues are bad engineering. To top it off, the engineers are being forced to do things for the epa and emission standards regardless if its a good idea long term or not

 

I’m going to guess that they know about turbo coking. Hence why it’s a water cooled turbo and not just oil cooled.

since they know about that, I’m also sure they know about the start/stop feature.

 

I’ll agree and maybe there is an electric type of pump that keeps coolant circulating through the turbo once the engine turns off. Maybe a person with more knowledge of the engineering will chime in for us

 

There is not an electric water pump. Thermal siphoning is probably what keeps water moving

 

I don’t think turbo cooling is a thing anymore. They have cooling systems built in that keep circulating after shutdown.

Toyota first used auto start/stop back in 1974 and has had it on the Prius since 1997 and other ICE engines since 2009. I’m sure they’ve learned a thing or two in those two decades about turbo cooling, starter life cycles, alternator output, and whatever else keeps people up at night.

 

The unintended consequence of AS/S will be people sutting still with not enough pressure on the brakes makeing it easier to roll. That's going to be great when you get rear ended sitting at a light, and you get pushed into the vehicles in front. Auto start/stop is hust one example of how silly the world has become.

 

I thought the turbo was not water cooled on the 2.4t?

 

You could always, you know… press the brake pedal hard enough. That engine is going to come back on. It’s seamless and damn near immediate. Noting bad is going to happen. You guys are inventing things to be worried about. This feature has been around a very long time.

 

In a world of electronically distracted drivers, having vehicles that shut off when stopped isn't going to do anyone on the road any favors.

 

But if I'm holding the brake pedal really hard and somebody rear ends me then the rubber on the bottom of my tires will get rubbed off on the pavement as I slide forward. So that isn't good either ..