Cooling down the turbo

[Ptothej]

To get to my house, you need to travel up hill at 60k/hr for about 10 mins.. thats after you've driven up the highway to bypass town, or climb columbia street through town (both decent grades). When I get close to my house I travel in 3rd gear at 40k/hr, just babying it, yet I find myself sitting at my house in the driveway for about 2 mins, just to get it down to 400 degrees (the probe is after the turbo), I see when I am moving, decelerating downhill espeically, that exhaust cools right down. My question is.. how can I speed the process of cooling the turbo down? We havent even hit close to what the summers are here, and Im frusrated at the time spent cooling it down when Ive basically idled it home for the last little bit.. and thats me driving within speed limits to that point. Any ideas?

[Richie O]

On an empty truck I never cool a turbo. If its loaded or I am really getting on it I will cool it. I just pull in and let it spool down good and click it off.

[gobigorgohome]

not sayin anyone is wrong but the turbos that we have now days in our trucks spin at over 60,000 rpms so in my opinion it would be a really wise idea to let them cool down a bit so you odnt ruin them too soon. and that 60,000 is on the big detroit series 60 engines that only spin 2000 rpms engine speed so i cant imagine the speed of our turbos. somethin to keep in mind anyway

[RumbleFish]

move the pyrometer to the manifold. this will give you a more accurate temp reading. if you dont want to sit around waiting for the turbo to cool down, you might look into a turbo timer. with that said, i usually only cool the turbo after working it. if i just putt home from work i dont worry about it, or ill idle it up the alley to my drive and its plenty cool by then.

[IowaCummins]

Viper 5000 remote start and alarm. has turbo cool down time. can program to let cool for 30 sec 1 min 3 min and like 5 min, then has valet mode where it will run for 30 min unattended. has grid heater delay so when you remote start it it allows grids to cycle, then start. i always let mine cool to around 300. i had the stock turbo kick out the thrust bearings and im not going to have it happen on this one. so i cool her down everytime. just as extra precaution

[Ptothej]

So basically theres no option other then to wait it out When some of you guys were saying just turn it off after putting around, thats what I do whe I hit work, because its downhill and I dont like to puch my truck cold.. it barely even warms up (all downhill, 10 min drive). But I suppose I should definetly let it cool down, because technically loaded or not and takin it easy, I think its working to an extent to get up the hill to my house, unless my pyro is out, but I doubt it, being an autometer, and not even a year old!

[cougar]

How hot does it get? My EGT is post turbo also and I don't worry about it under 800°. If it really bothers you, you can louver the hood over the turbo to get some air cooling.

[PToombs]

800* post turbo? That's like 1200 pre-turbo! I hope you typed something wrong, because most of us worry when it's that hot, even driving!

[SNOOT]

I have a cool down timer that I bought years ago. Works great offers a 2 minute 4 minute and 6 minute delay shut down.

[Ptothej]

I thought about a vented hood idea, but am worried how gay that might look on my truck for what I use it, and the look I have going for it. 800 post turbo for me heading up the highway at 90-100km/h, Shut off at 400.. sounds like a turbo timer would be a great idea for me.. I assume fairly easy to install?

[cougar]

800* post turbo? That's like 1200 pre-turbo! I hope you typed something wrong, because most of us worry when it's that hot, even driving!

800=1200, I doubt it. If that were true I should have melted my turbo a decade ago! Pulling a big trailer through the mountains seeing 1100-1200° for long stretches was not unusual. As long as my water temp stays normal I don't worry about it. People get too paranoid about EGTs because they don't understand the thermal dynamics behind the whole thing. Yes there is a thermal limit that the vanes can take, but what is it really, are you looking at all the factors, and are you getting a true reading. Want a different reading? Move your probe. Been playing this game with pilots for decades on aircraft. My final decision on if it is running too hot is what the parts look like.

[TWorline]

"A buddy with an '03 just dropped a valve in his while on trip.. shop had put the EGT probe behind turbo/ex brake.. turns out reading were about 400F off.. and he hauls 15-17K lbs regularly.. (it did this for a year)"

Excerpt from an eMail that a customer sent me recently. I too like to look at parts that have failed in other peoples machines, not so much mine.

[SNOOT]

Here are some pictures. His web site in no longer good. You may be able to e-mail him about them. Mine works great and its simple to hook up.

All you do is put the truck in park apply the e-brake select 2,4,6 minutes turn the truck off and walk away. If some one gets in the truck to drive away the unit shuts the truck off if the e-brake is released.

Back of unit.



Front


Side

[KD93]

My final decision on if it is running too hot is what the parts look like.

Which is great if you want to be pulling apart stuff all the time. But for day-to-day operation, that doesn't really help, does it?
The reason it takes so long for your engine to cool down is because you're standing still. You need air flow over it to cool down faster. Maybe have a big ol' fan at the top of your drive?! I think Ritchie and the others are right, let it settle to a nice idle and switch her off.

[BC847]

Y'all are forgetting about the heat in the bearing cartridge "Coking" the oil.

Shutting the engine down without allowing sufficient time for the turbo (entering EGTs) to cool invites issues with the oil cooking (coking) thus leaving heavy deposits that can lead to accelerated bearing wear/failure.

Check the specs of the engine lube oil you run and be sure to allow the EGTs to cool to below the max operating temp of your oil (assuming pre-turbo EGTs).

. . . . . ask me how I know.