Does the new LC require a turbo-timer to be installed? I know the wastegate is vacuum-operated, but how is the bearing cooled after the engine shuts down? We added a turbo-timer in old-school engines, but I have not read anyone discussing this yet.
Turbo Timer
- Thread starter jambo
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This is a great question. I had one on my MKIV Supra and my TSi AWD Talon --- although I must say I haven't seen many people using them in years. I'm not sure my GTR had one either. In for the info.
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That is a good question. Had one on my TA years ago. It is a good practice to keep the oil changed and after hard running, like heavy towing, to allow the engine to run at idle for a few minutes to allow the coolant and oil to circulate. I would think under normal driving it won't be an issue.
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Yeah you maybe right. Just thinking if this is a low end torque engine and peak torque is achieved at low rim, that makes me think turbo comes on pretty early and turbine wheel is spinning very fast. Might be a good idea to install one as a precaution for mental peace. Unless these new engines have some fancy electric driven oil pump with a bypass to supply oil to the bearing after shut-down. Theoretically possible but I doubt it will be in the new LC. I am old school thinking can't help. Lol
This interview with the tacoma lead engineer (same engine) sounds like there isn't as much of a worry about cooling down
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Sweet. Thank you this post.
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I'm thinking the electric motor will take care of the low end torque
Hello, am new to this forum, and been around turbo engines forever. That Toyota engineer seems to give a sweet sounding answer that almost makes me want to go to sleep, yet seems to not consider Toyota's start/stop mechanism that shuts down the engine at every traffic light?
Fact is small turbos spin up to 35,000 to 40,000 rpm and their life depends on a constant cooling oil flow to remove the insane heat load. It escapes me how removing the cooling oil circulation for a glowing hot turbo, by stopping the engine abruptly at every traffic light because of start/stop logic, could have the turbo last more that just for a bit? In addition every time oil circulation is resumed, the "Thermal cracked" and broken down oil from the turbo circuit, is sent to lubricate critical engine components like main bearings... Unless Toyota can confirm there is a continuous cooling oil circuit supplied by a separate electrical pump powered from the battery, this seems another costly train wreck waiting to happen. Turbo repairs are costly and run in the thousands of dollars... not pennies.
Good news is there is a simple workaround; select tow/haul mode, and the cooling oil flow does not get interrupted, because the engine idles like a charm.
Fact is small turbos spin up to 35,000 to 40,000 rpm and their life depends on a constant cooling oil flow to remove the insane heat load. It escapes me how removing the cooling oil circulation for a glowing hot turbo, by stopping the engine abruptly at every traffic light because of start/stop logic, could have the turbo last more that just for a bit? In addition every time oil circulation is resumed, the "Thermal cracked" and broken down oil from the turbo circuit, is sent to lubricate critical engine components like main bearings... Unless Toyota can confirm there is a continuous cooling oil circuit supplied by a separate electrical pump powered from the battery, this seems another costly train wreck waiting to happen. Turbo repairs are costly and run in the thousands of dollars... not pennies.
Good news is there is a simple workaround; select tow/haul mode, and the cooling oil flow does not get interrupted, because the engine idles like a charm.
