Duramax Diesels Forum Truck of the Week
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Old 10-19-2017, 08:08 PM
77cruiser 77cruiser is offline
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Default Something I've noticed

I've noticed a lot of people pull in after running down the Interstate pulling a big trailer & just turn it off like a gasser.
I'd guess they're flirting with turbo failure down the road.
How many give it a few minutes to cool down?
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Old 10-19-2017, 08:27 PM
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I sure do ! I'm sure most of the tuner guys are smart enough to do the same, regular driving I let it cool off at idle three minutes

Pulling a heavy load off the highway let it cool off 5 to 10 minutes
And I always hit the idle switch when I let mine cool down so the cylinders don't get washed out overtime


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Old 10-19-2017, 08:51 PM
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I don't worry about it with my new truck but on my lml with fixed vane charger I tried to let it cool before shut down..
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Old 10-19-2017, 09:02 PM
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I have a turbo timer that's hooked up to my cts. I can set it for a certain time or a certain egt temp.
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Old 10-19-2017, 09:18 PM
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By the time Im coming to a stop anywhere, even a rest stop, the egts have dropped to 350-400* and it aint an issue. If I leave it running, its to keep the dog cool in the truck lol.

Ihi was rebuilt about 20k ago and Russ said he didnt see anything worrying. 215k on the truck now. So I am that guy but its not a problem if gauges show things are already cool
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Old 10-20-2017, 04:10 AM
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Quote:
Originally Posted by Chevy1925 View Post
By the time Im coming to a stop anywhere, even a rest stop, the egts have dropped to 350-400* and it aint an issue. If I leave it running, its to keep the dog cool in the truck lol.

Ihi was rebuilt about 20k ago and Russ said he didnt see anything worrying. 215k on the truck now. So I am that guy but its not a problem if gauges show things are already cool
Same here.

By the time I'm ready to get out and shut it off the egts are usually below 400 anyways
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Old 10-20-2017, 05:26 AM
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Quote:
Originally Posted by lutzjk913 View Post
Same here.

By the time I'm ready to get out and shut it off the egts are usually below 400 anyways
Same, as long as my egt's are below 400 i shut it down. If they aren't it's only a few seconds to get there.
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Old 10-20-2017, 05:46 AM
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The real question is who let's there trucks warm up
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Old 10-20-2017, 05:51 AM
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Same here. About 10 seconds is enough.

I usually let it warm up a little bit then keep it under 2k until its warmed up


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Old 10-20-2017, 05:52 AM
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Quote:
Originally Posted by 77cruiser View Post
I've noticed a lot of people pull in after running down the Interstate pulling a big trailer & just turn it off like a gasser.
I'd guess they're flirting with turbo failure down the road.
How many give it a few minutes to cool down?
Water cooled turbos dont need cool down time to prevent oil coking.

Quote:
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The real question is who let's there trucks warm up
I have to in the winter. Not having a vvt makes getting up to temp take longer than normal.
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Old 10-20-2017, 06:24 AM
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Mine warms up 10-20 minutes unless I’m in a hurry, hate a cold vehicle, as far as cooling down, I don’t run gauges and I don’t worry about it, usually isn’t an issue.
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Old 10-20-2017, 06:31 AM
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My LMM with a stock turbo I turn it off when I stop (if it was that big of an issue GM would have put a turbo timer in from factory). My LB7 with the 69sxe, by the time I stop it's at 400 like everyone else has said. I let the LMM idle for about 2-3 min then get in it and drive when it's cold out.
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  #13  
Old 10-20-2017, 06:50 AM
77cruiser 77cruiser is offline
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I take it 400 deg. exhaust temp is a good number.
Is the turbo on a LB7 water cooled?
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Old 10-20-2017, 07:16 AM
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Quote:
Originally Posted by Hambone View Post
The real question is who let's there trucks warm up
if its 60* or colder out, you are damn right but just cause i want the heater going. 60* is cold for an arizonian

Quote:
Originally Posted by 77cruiser View Post
I take it 400 deg. exhaust temp is a good number.
Is the turbo on a LB7 water cooled?
400* and cooler is a good number to go by. generally idle is around 300-350* at the coolest no matter how long it idles. yes, the stock IHI is water cooled, all factory GM duramax turbos are water cooled.
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back from the dead 7:04pm 4/9/2012

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Old 10-20-2017, 07:35 AM
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Unless you just got done running the truck very hard and shut it down your not going to cook the oil. I don't know that I trust the EGR gauge to go by. The turbo could easily be hotter.

We have a lot of idiots that work for us and they shut down hot equipment all the time. They don't even wait for the engine to idle down. So it going from hot and WOT to off and we're not having turbo issues.

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