Auto stop-start feature BAD for turbo

All wrong unfortunately

 

Just quoting another guess from someone on here.

 

My 2013 BMW has turbo and auto/off/start but it has a button to disable it, which I disable it with. The car does not run after you turn it off. Ever, no matter if I have it disabled or not.

 

Huh?

 

Maybe I misunderstood. But it sounded like you guys were saying after the vehicle is turned off it would keep circulating coolant to the turbo to keep it from going bad. Did I not read it correctly?

 

I was confused. I get what you are saying now. Sorry.

I think the notion that the turbo is going to be damaged by anyone is overblown.

 

See that is why I find it funny that the Tundra manual mentions about the turbo cooldown and start stop but the Tacoma does not. I know these are different engines but what I am wondering if with the changes they made to the 2.4 to harden it for truck use then will those allow for better cooling of the turbo so the start stop function does not effect it?

 

The Tacoma manual does have that, but it’s written differently. Page 192

 

My biggest concern on start stop is the ability of the truck air conditioning to keep the inside cool, at a stop light, in 100+ F temps. If the Toyota engineers have it programmed so that the engine doesn’t turn off in high temps, I would have no other concerns.

I tested BMW’s implementation on the X5. That day it was 110F.

 

Climate control is a setting....it may turn off but will turn the engine back on if needed to keep the cold air flowing

 

Can’t wait for someone to test it in Phoenix next summer.

 

That is contrary to the post excerpting the Tundra user manual.

 

IMO, the auto-start feature is a deal-breaker if it cannot be disabled.
One might *assume* the starter motor duty cycle is beefed up for this huge increase in duty cycle... but I doubt it.
I saw the price and labor costs for a starter replacement on a Tundra... it was staggering.

After a stop light shut down, the engine is NOT at full oil pressure.
One can *assume* this isn't a true "dry start" but for absolute certain, the oil galleys are not up to pressure.

Crank and rod bearings are not roller types which are somewhat more forgiving of lack of oil pressure.
Babbit-type flat bearings ride on a cushion of oil (pressure) that is absent when those parts first start moving.

What Toyota should have done is engineer an electric auxiliary oil pump to maintain galley oil pressure at stop light shutdowns.

IMO, this is gov't mandated baloney for some myopic view of increase fuel economy, at the expense of engine and turbo life.
A deal breaker.

 

It can be disabled.

 

If AC is on start stop won’t activate in my 2023 tundra. I’d assume the Tacoma will be the same. The motor needs to turn the AC compressor, so if it’s off it’s kinda hard to do that.

also I don’t get the speed thing in the manual for letting the turbo cool. If you’re at 100km/hr the rpm’s are very low and turbos spin directly proportionate to engine rpm’s. Once again there is an electric pump that circulates coolant(separate tank from radiator coolant) through the turbos to cool them if need be after truck is shut down. Again I would assume the Tacoma gets the same system.

 

modern cars with watercooled turbos dont need to be run after shutoff, turbo timer etc. There are 100s of 1000s if not millions of F150 turbos with auto start/stop running just fine including mine

https://www.garrettmotion.com/racin...t actually,of the turbocharger after shutdown.

"Water cooling’s main benefit actually occurs after the engine has been shut down. Heat stored in the turbine housing and exhaust manifold “soaks back” into the center section of the turbocharger after shutdown."

 

I wonder how much fuel is wasted shipping oil around the world due to sanctions limiting the amout of oil a carrier can haul, or which path of travel they are allowed to take?

 

Turbos spool based on engine load; not just RPM.

 

Toyota uses a VGT turbo. It won't spool 100% all the time based on engine load to increase turbo longevity. Only will spool 100% when required.

 

The starters are built for the duty cycle (note no widespread starter motor failures) and the millions of cars on the road with as/s systems haven’t had Babbitt bearing failures.