help me understand turbo temp for safe shutdown - Chevy and GMC Duramax Diesel Forum
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post #1 of 6 (permalink) Old 01-23-2020, 02:36 PM Thread Starter
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help me understand turbo temp for safe shutdown

I have a 2019 Dmax with a Banks i-Dash.

I know from the owners manual and from the forums that I should not shut the truck down when the turbocharger is "too hot", say at the top of a long hard hill pulling a trailer. I think I read that the 2020's come with a feature that won't let the truck shut down until the target temp is achieved.

1. WHICH PID ARE YOU USING TO MEASURE "TURBO" TEMPERATURE? I have EGT which I understand to be exhaust temperature into the turbo, and I have EGT1 which looks to be the exit side of the Turbo. Is EGT1 the right temperature to use to indicate turbo temperature for safe shut down?


2. And, HOW LOW DOES THAT TEMPERATURE NEED TO BE TO SAFELY SHUT DOWN? I'm using Mobile Delvac oil that (supposedly) comes in it from the factory.

I've seen some discussion on the forum on target temperature, but am confused mostly on WHICH temperature I need to look at. I have 6 different exhaust system temperatures available on my gauge = EGT + EGT1-5

Thanks.

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post #2 of 6 (permalink) Old 01-23-2020, 06:25 PM
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All the other models of HDs were coolant cooled turbos....so none of that shut down thing mattered.

Different turbo on the L5P, is it not coolant cooled like all of the others (Garrett) have been?

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post #3 of 6 (permalink) Old 01-23-2020, 11:02 PM Thread Starter
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No idea....

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post #4 of 6 (permalink) Old 01-24-2020, 04:44 AM
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Best bet is to let EGT stabilize. I typically let the EGT on my truck stabilize below 400F so it does not cook the oil in the bearings. Turbo cores are oil, water or both cooled units.

Unless you pull a long hill at 1000f plus temps and come to an abrupt stop at the top shutting the truck down with elevated output pressure, the turbo starts cooling immediately after the pull. I have monitored mine and usually notice even after hard driving, it takes less than 1 minute after parking to stabilize below 400F.

If you are concerned, watch EOT along with EGT. EOT while driving will be 20-30F above ECT (flat driving pulling trailer), when you stop, EOT's usually drop below ECT's. Watch EGT, EOT, and ECT to see when they stabilize. Once the stabilize, wait 30 - 60 seconds before shutting the truck off.

I think the extended run feature has to do with the regen cycle. If it does not complete a regen within X number of shutdowns, it will restart and finish the cycle.

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post #5 of 6 (permalink) Old 01-24-2020, 08:58 AM Thread Starter
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Pardon the dumb question, but what is "EOT"?

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post #6 of 6 (permalink) Old 01-24-2020, 09:18 AM
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engine oil temp EOT vs engine coolant temp ECT

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2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

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