Mine cools down pretty quick, and even more so when I pulled the muffler and put on the BHAF. After a good run of towing my Jeep (~14K gross) she'll take 2-3 minutes to cool off.

 

ya normal driving on highway for an hour it takes prob 45 seconds to hit 350 and then i shut her off. i think thats prob fine esp 300 takes forever to get too

 

Unless you are towing or hot rodding, by the time it gets parked, its cool enough to shut down. Turbo timers are totally unnecessary. When was the last time you heard of a turbo failing ? And 99% of people don't idle these trucks before shutting them down.

 

Cooldown isn't all that necessary anymore. Towing is the only time I'd really bother with it.

Then again, I use mostly syn oils.

 

Okay let me add to the question. I have a 48RE 2006. I "heard" that you should let it cool down in neutral so the transmission fluid would continue to circulate. Any truth to that. Or is putting it in park and letting cool down the same.

Thanks for you help
Strea

 

The tranny won't circulate fluid in park so that's why some say to leave in neutral while idling after working the truck so the tranny will cool properly. That's just what I heard. I don't own auto trannies though.

 

heres a link to a module that is used w/ the isspro pyrometer. it goes by temp and not time. looks like a really nice product and im soon going to be installing one in my ride.

http://www.dieselmanor.com/isspro/ttm.asp

as far as the trans temp. i was talking to a guy from Goerends and he said that while in neutral it isnt helping w/ cooling. idk? but i do know if i throw mine in neutral at a stop light sometimes is contiues to climb a bit. i guess cause no air is going through the trans cooler.

 

I have an 06 and have installed a Howards timer. It works great.

 

Here is a trick to cool down your EGT a little quicker. It worked very well on my Fords that had Pyros and I dont have one yet on my Dodge but it should work the same. When you know youre going to kill the engine get your RPM's up in the highest gear your can let off the throttle and down shift the engine each time it hits about 2300 RPM without touching the throttle. Normally I match the RPM's when downshifting but to cool the turbo it works better not to or to just barely blip the throttle. If you have an Automatic just do the same by downshifting the auto. If someone has a Pyro try this trick and report back please. It is amazing how much all of that cool exhaust cools down the turbo. On the Fords, they do not inject any fuel into the cylinders above 1100 RPM when the engine is spooling down. Again, I am not sure of the Cummins is the same!

I am not sure if this trick would work with the exhaust brake or not.

Joe

 

Skyharborcowboy...your idea of downshifting does work. I have used it before pulling our 17K fiver on the interstates. I start downshifting to slow down when I pull into a rest area. If you keep the RPMs up like you say by constantly downshifting, I have been able to shut the truck off as soon as I come to a stop. No idle necessary. If I plan far enough ahead and don't need the Jacobs to get slowed down, it works like a charm. If I use the Jacobs, it still works, just not as good. There will still be some cool down idle time if I use the Jacobs very much getting slowed down.

Hope this is what you were looking for.

Steve

 

so is it not hard on an auto tranny to down shift it like that all the time??? it seems like it could'nt be the best but then again what do i know

 

Turn the A/C off a couple minutes before stopping. At least turn it off as soon as you do stop to minimize the wait time.

Putting the tranny in neutral will help cool the tranny fluid but won't help cool the turbo.

 

With the new hi idle feature enabled would idling it no load at the intial 1100 rpm speed up the cooling after towing for a while? I pull an almost 10K 5th wheel but have yet to go camping since the hi idle was enabled and have no egt sensor.

 

Sorry for the confusion Zac. I have a 6 spd manual NV5600. (see my sig on my original post.) I thought we were talking about manual trannies. Sorry if I confused anyone.

Steve