hellotbone

Whats your average cool down time? Mine only takes like 10 seconds at the most when I stop. It really seems to cool quite quickly. ;D

rharveysr

That also depends on how hard I have pushed the truck. If we have been towing for a couple of hours...it takes a couple of minutes..But if I have been running empty..most of the time its well below 300* by the time I idle thru the parking lot at work or into the subdivision where I live...<br><br>Rick

BigK

'Bout the same as above. Not really very long at all. I let it cool to 275, because in the 30 sec-1min after shutdown, temps climb to near 300. This is reading post-turbo.

DieselDaze

I use my truck as a daily driver. <br>It doesnt get worked like some of our members trucks.<br><br>A day in the life of my truck would consist of parked, city streets, freeway, city streets, and parked.<br>However, parking at work or in my driveway, I still give it one to two minutes to idle.<br>I do this for two reasons:<br>1) Let the turbo spool down (even though I know it really hasnt been worked on a drive to work/home).<br>2) Let the tranny fluid circulate a while and cool before I place it in park and shutdown.<br><br>Of course, if Ive just come in from a long freeway trip or some other activity as such, then I let it cool longer.<br><br>Rich.

ridofpwrstroke

I have heard that it is good to have it around 300 degrees. That's what my pyro says. Mine usually only takes 5 secs to get there.

wannadiesel

The work truck (not a Dodge, see signature) takes from 5 to 8 minutes to cool down. The probe is in the backpressure test port on the PacBrake.

NAIL BENDER

My cool downs take awhile. When I installed my 4&quot; I put exhaust wrap on the down pipe. Do you think that in trying to keep the exhaust temps out of the underhood, I am keeping my egt's from cooling down? Has anyone else done this and what is your finding?<br>

Stamey

My cool down takes anywhere from 1-3 minutes, depending on ambient temperature outside. Sometimes I idle up the engine to about 1200 to move out the heat and drop the temps faster.<br><br>Chris

HC

Jamie,<br>Look at a map, it's COLD where you live! <br><br>Seriously, my times in summer, temps of 85 F or above, can be several minutes unless I just coasted down a hill in gear.<br><br>In winter, when temps are below 45 F, less than 1 minute. Below 32 F / O C, 10 seconds sounds normal to me, too. <br><br>

drafalske

<br><br>Exhaust/header wrap is used *mainly* in racing situatons for a dual effect of lowering underhood temps (thus providing nice cool air for the intake charge), and retaining heat in the header or collectors, which improves scavenging and speed exhaust flow. Personally, I am all for it, but I suppose the longer cool downs are one small side effect. I have used this on my Camaro, but have not tried it on the truck yet. <br>Dave

Monty

It usually takes mine under a minute to coold down to 300. Whats interesting is that Banks says that turbo cool down time is not needed and that it is an old myth. : Regardless, I still let it cool down.

From the Banks Website:
MYTH #7
You have to let a turbo-diesel idle for two minutes before you shut it off.


FACT
This is a current myth that has a basis of fact stemming from many years ago. It also has a kernel of truth regarding today’s turbocharged gasoline engines that operate at higher peak exhaust temperatures than turbo-diesels. In the early days of turbochargers, the turbo shaft was supported by a babbitt bearing that could seize, or even melt, if the engine was shut off immediately after sustained boost conditions where the turbocharger would “heat soak”. A two minute cool down at idle allowed the turbocharger to dissipate any remaining spinning inertia, and the oil circulation cooled the bearing and prevented oil “coking” in the bearing area. Turbochargers haven’t used babbitt bearings for over 30 years, and today’s oils resist coking. Synthetic oils won’t coke, period. With a turbocharged gas engine, it’s still good insurance to let the engine idle for 30 seconds to a minute to allow the turbo(s) to dissipate any inertia and to cool the bearing area to prevent oil coking, especially if the engine has been worked hard just prior to shut-down. Of course, using quality synthetic oil eliminates this potential coking problem.

Today’s turbo-diesels are a different story. There is really no reason to “cool down” a turbo-diesel these days, but you won’t hurt anything by doing it either. You can still find people who swear you have to do it, but the myth is fading. Maybe they just like to sit and listen to the radio.

SjLingenfelter

It shouldnt matter if its babbitt bearing or what it still has bearings it still has HOT oil running through and your still gonna burn the bearings out if you dont let it cool down. I think that &quot;FACT&quot; from banks is [censored]! &gt;<br>SD03

TxDieselKid

takes a couple minutes to cool mine down to 300(PRE TURBO), but the tempetures down here are high, and so is the humidity.

Don't fool yourself though, cooldown time is important. Banks may say one thing, but Piers, KwikKurt, and LOTS of others say otherwise.

Andrew

BigBlue

I let mine cool down to 330-350* post turbo. Depending on how had I run it, anywhere between 30 secs-2 mins.

HC

Usually, the engineers who write owner's manuals don't like to put in things that impose on the driver and make their design seem &quot;less robust&quot; than the competition's. If Chevy says 7500 mile oil changes, you can bet Dodge and Ford don't want to tell you that their trucks require a change every 5000 miles, that would give an &quot;advantage&quot; of lower maintenance to the competition.<br><br>So if turbo cool down was purely myth, and made unnecessary by current designs, the manufacturers would be rushing to remove this requirement from the manual, and would probably replace it with a paragraph stating why their &quot;superior design&quot; made this cool-down unnecessary in their &quot;modern truck&quot;.<br><br>I will believe the Banks statement to the extent that we have eliminated catastrophic failure on a single hot-shutdown. That's very good to know. And I will worry less about those rare occassions when untrained drivers might shut my rig down hot when I'm not there to see it. But I will continue to believe that turbo life and oil life will be maximized by the Cummins/Dodge recommended cool-down, or in my case, bringing EGT's down before turning off the key. Call me stubborn.