Safe EGT shutdown temps?

[Radshooter]

I know everyone says to shut down at 300 or below, but is that pre or post temps? My pyro is pre turbo, and sometimes it takes a long time to get down to 300. If I use the "add 300" rule, or "subtract 300" (depending on which way you go), does that mean it is safe to shut down at 400 or 500 pre turbo and still be OK? I've been waiting until the pre-turbo is down to 300 because I know the air coming out of the turbo cannot be hotter than the air going into the turbo. So if the air going in is only 300, then the air coming out is 300 or less. Eventually I would like to add a post turbo pyro, but for now, I have the basics, and we have other bills that need to be paid!



Thanks for your help

 

[rbattelle]

Post-turbo standard shutdown is 300. I generally wait until 250 or less for 2 reasons:



-it takes no time at all to get below 300

-I want to run some fresh, cool oil through the bearings before shutdown.



If you're waiting until 300 pre-turbo, then you're fine.

 

[JWillms]

I have my probe pre turbo and its closer to the celinder then the turbo so I usually wate tell it gets below 400, when I have been running her hard Ill wate tell around 300 or less just depends on how I have been driving for me.

Justin<><

 

[jimnance]

I think some people worry too much with shut down temps. I'm on my fifth CTD and never had a problem with coking the turbo bearings. I put over 100,000 miles on each of the previous trucks.



My procedure. Around town I turn it off pretty much as soon as I stop. When getting off the freeway when driving empty I give it 30 seconds or so at the service station. When towing I give it a minute unless I've just pulled over after a big pull. Then I give it three or four minutes.



My . 02.

 

[4xquadrod]

Oil

I talked to a turbo shop about the turbo on my sand car. They said that I should wait until the system cools off enough that the turbo does not spin longer then 10 seconds after I turn it off. Their theory was that any oil that was going through the bearing would be through by then and it would be spinning dry. If you are running a good synthetic oil the bearing is not subject to coking near as much as a conventional oil. I know I turn off my sand car way too soon and I have still never coked a bearing. I use Mobil 1 in the car. I always wait till 400 to turn off the truck.



But Don't Quote Me I'm just an average Joe

 

[curatchko]

My 99 with it's pyro gauge, had a very slow responding thermocouple. It would take about 1 - 1. 5 minutes for it to drop from 450 to under 400 to maybe 350... I didn't like shutting it down at 450. . I'm a little nutty about waiting... I get wierd looks from the passengers all the time sitting there looking at the pyro...



The Dipricols in my 04, came with what they are calling a 'New Style' thermocouple, that they say is more responsive. When I pull into a parking space, I'm down from 450 to about 300 in a matter of seconds... . and I idle it there for about 30 seconds or so... max.

 

[Radshooter]

Thanks guys... I appreciate your comebacks. It seems to take about 1 minute to get down from 400 to 300. Sounds like I am in the ballpark with everyone else.



Thanks.