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Old 04-23-2016, 11:56 AM   #31
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Some useful information on here. Thanks for the hints and tips.
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Old 04-23-2016, 12:11 PM   #32
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Anyone who is telling you not to do a turbo idle cooldown is plain flat WRONG and don't listen to them. The only possible exception is if the vehicle you own has a turbo that is water cooled. Water cooled turbos continue cooling the bearings via convection flow after engine is shut off.

The only way to for sure to know if the drive off the main road to your camping site was good enough to cool the turbo down is with an exhaust gas temperature gauge. If EGTs is below 300 deg F then go ahead and shut her down immediately. If you don't have an EGT than follow the Ford diesel supplement instructions with a 3-5 minute cooldown.

My other diesel's owner manual says almost the same thing that the Ford diesel owner supplement manual says which is:
30 second warm up in warm weather
1 minute warm up in cold weather
30 second to 1 minute turbo idle cooldown in normal driving
1 minute to 3 minute turbo idle cooldown in highspeed highway driving
5 minute cooldown when towing.

Is idling your rig 5 minutes after towing going to kill your pocket book or ruin your day with time wasted? NOPE. Having to replace a turbo prematurely will though!

Just follow the instructions in the DIESEL SUPPLEMENT and you'll be ok.
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Old 04-23-2016, 12:42 PM   #33
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Originally Posted by TonyD View Post
Anyone who is telling you not to do a turbo idle cooldown is plain flat WRONG and don't listen to them. The only possible exception is if the vehicle you own has a turbo that is water cooled. Water cooled turbos continue cooling the bearings via convection flow after engine is shut off.

The only way to for sure to know if the drive off the main road to your camping site was good enough to cool the turbo down is with an exhaust gas temperature gauge. If EGTs is below 300 deg F then go ahead and shut her down immediately. If you don't have an EGT than follow the Ford diesel supplement instructions with a 3-5 minute cooldown.

My other diesel's owner manual says almost the same thing that the Ford diesel owner supplement manual says which is:
30 second warm up in warm weather
1 minute warm up in cold weather
30 second to 1 minute turbo idle cooldown in normal driving
1 minute to 3 minute turbo idle cooldown in highspeed highway driving
5 minute cooldown when towing.

Is idling your rig 5 minutes after towing going to kill your pocket book or ruin your day with time wasted? NOPE. Having to replace a turbo prematurely will though!

Just follow the instructions in the DIESEL SUPPLEMENT and you'll be ok.
I monitor all 4 EGT temps, my oil temp and my coolant temp. All temps are in check when I get off the highway and cruise through the city/town streets to whatever campground I get to.

There are so many PIDS you can monitor to know how your truck is doing.

So although I appreciate your comments, unless you are monitoring everything, you can't say that I am wrong about not doing any more of a cool down when towing unless you are pulling immediately into a rest stop from highway driving.

And lastly, with all this emissions BS that are on our trucks, it is no good for the motors to idle. Any chance you have to shut down is far better then idling so IF you don't have to do a cool down, then don't.

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Old 04-23-2016, 01:03 PM   #34
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I am NOT a gear head. Let me say that up front.

But......everything I read in manual and on Duramax forum says that the LML Duramax does not have a true engine brake at all.........just a transmission brake. The manual simply says both EB and TH can be engaged separately to enhance each other. The guys on the forum say that the EB (exhaust brake, not engine brake) downshifts, and the TH mode 'make the downshifting more aggressive'........which is all I could imagine it was doing.........

That may be enough, and it may be noticeable.........just haven't tried it under heavy load yet (don't have my trailer yet).

And I fear I've 'hijacked' a Ford discussion thread..........and I'm sorry. I thought it was a universal discussion but apparently it's not. My bad.

I'll try to clear things up for you this best I can.

T/H changes shift points and pressures in the transmission. It also locks the torque converter up in all gears after 2nd gear.

Engine brakes are not on our engines. But they are available for the Cummins in the aftermarket world. An engine brake (Jake Brake) uses solenoids to open the exhaust valve during the compression stroke.

Exhaust brakes on our trucks are also called a turbo brake and a VGT brake. They use the turbo veins to create exhaust back pressure to slow the engine down.

The exhaust brake and T/H mode are separate systems, but when they are both engaged they do work together. The exhaust brake slows the engine down, which causes the transmission to down shift more. And the more it down shifts, the higher the engine RPM's are. And the higher the engine RPM's are, the better the exhaust brake holds back.

As far as the OP.

The reason for letting the engine idle after running it hard is because the turbo is doing thousands of RPM's, and when you shut the truck off, it's not circulating oil anymore. Under full boost the turbo is spinning up to 30,000 RPM's. Bearings don't last very long at that speed with no oil circulation.

My truck doesn't have an exhaust brake switch. Mine is achieved through EFI Live tuning. Whenever the T/H is engaged and I have my tuning on the tow tune, it turns the exhaust brake on. The only time I don't like it is when I am in heavy traffic. If I could turn it off in heavy traffic, I would. The turbo has a lag going from closed veins to open. All other times it works great!
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Old 04-23-2016, 04:46 PM   #35
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Hi Blwnsmoke. Nice readout. What are you using to get that?
Thanks, Paul
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Old 04-23-2016, 04:51 PM   #36
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Thanks!

FYI, I have to turn T/H on in order to see Transmission Temp on my driver display panel. Otherwise, that slot shows volts. That is on the steering wheel lever. EB is a toggle below the Info readout, along with other toggles.

I appreciate the explanation. I will make sure I know how it all works when I can get it hooked up.
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Old 04-23-2016, 09:45 PM   #37
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I have a 2016 F350 and I always used Tow Haul mode when towing but I have a superstar button for EB which I only turn on when towing works well but only at speeds lower then 30mph.

I usually warm the truck up for a minute or so all the time, when I am towing I will let it idle for a few minutes to cool down. In the warmer weather while towing I will let it cools down when I am backing the trailer in and getting it level. In winter I will warm it up for 1-3 minutes before taking off.

I have always used this method and it works, got 250,000 on my Toyota 4Runner Engine, and it was still going strong when I sold it. The warm up in any weather seems to be critical so oil gets through the engine.

I think there are a lot of opinions out there but the info I have learned here is great, I want to use some common sense as well as some ideas I learned here, all great info and absolutely love my 6.7 PowerStroke Ford Diesel, truck is awesome and I am glad I bought it now instead of waiting. Next year we will be selling our Hybrid for the 5th wheel and can't wait.


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Old 04-23-2016, 10:03 PM   #38
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I think I'll try reading the manual.
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Old 04-23-2016, 11:37 PM   #39
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This just came up on the local news. No details other than it was at the I-65 S AL Welcome Center/rest stop at Ardmore, AL.

I could say say something about not letting his turbo cool down before shutting it off, but this looks like some serious s--t happened and I hope everyone involved is OK. The truck and trailer can be replaced.
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Old 04-24-2016, 12:34 AM   #40
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Originally Posted by blwnsmoke View Post
I monitor all 4 EGT temps, my oil temp and my coolant temp. All temps are in check when I get off the highway and cruise through the city/town streets to whatever campground I get to.

There are so many PIDS you can monitor to know how your truck is doing.

So although I appreciate your comments, unless you are monitoring everything, you can't say that I am wrong about not doing any more of a cool down when towing unless you are pulling immediately into a rest stop from highway driving.

And lastly, with all this emissions BS that are on our trucks, it is no good for the motors to idle. Any chance you have to shut down is far better then idling so IF you don't have to do a cool down, then don't.

If you have monitors of EGT temps and it is below 300 deg F then go ahead and skip the idle cooldown. NOT EVERYONE is monitoring their EGTs temps to include me and so a 3-5 minute cooldown after towing is added safety. Idling a diesel engine for 3-5 minutes won't hurt it one bit even with modern emission systems.

What monitor are you using? I like it and want one. Thanks!
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