Turbo Cool Down???

prairiedog · **Joined:** Sun Mar 11, 2007 2:35 pm **Posts:** 15

Was thumbing through my owners manual today and came across the section on Turbo Cool Down..It seems I am supposed to be letting my CRD idle for 2 minutes after highway driving to cool down the turbo..Does anyone here actually do this? I never have. Can someone here tell me if I am hurting this engine by not doing this?

midwest · **Joined:** Tue Apr 25, 2006 12:03 am **Posts:** 173

If I am coming off the interstate I will usually take my time getting to the fuel station or wherever I am going, ease up to the pump and let it idle a minute or so. Driving through my subdivision at slow speed will cool it down too. However, i'd never pull straight off the interstate and shut it down.

TDI4BY · **Joined:** Sun Apr 02, 2006 11:56 pm **Posts:** 644

Most of the time driving through your town or neighborhood will be plenty of cooldown IMO, shoot even a long freeway offramp and then sitting at the stoplight/sign will add to the cooldown. You are fine.

Emos Way · **Posted:** Mon Mar 19, 2007 12:29 pm

TDI4BY wrote:

Most of the time driving through your town or neighborhood will be plenty of cooldown IMO, shoot even a long freeway offramp and then sitting at the stoplight/sign will add to the cooldown. You are fine.

I agree.. after some city driving I let it idle for about 20-30 seconds then turn it off, as for highway driving, unless your drive-way is attached to the off-ramp you should have lots of cool-down time just getting home.

KJbob · **Posted:** Mon Mar 19, 2007 12:53 pm

Emos Way wrote:

TDI4BY wrote:

Most of the time driving through your town or neighborhood will be plenty of cooldown IMO, shoot even a long freeway offramp and then sitting at the stoplight/sign will add to the cooldown. You are fine.

I agree.. after some city driving I let it idle for about 20-30 seconds then turn it off, as for highway driving, unless your drive-way is attached to the off-ramp you should have lots of cool-down time just getting home.

Same here...after I get off the highway I drive about thrre or four blocks in the city. Then when I pull in to park I'll let it idle for maybe 15-30 sec.

BVCRD · **Posted:** Mon Mar 19, 2007 12:55 pm

I sure do. After coming home through town, (25 mph) I let it idle in the garage for about 1 minute. Fresh off the highway stopping for gas is a full 2 minutes+.

CATCRD · **Posted:** Mon Mar 19, 2007 3:21 pm

BVCRD wrote:

I sure do. After coming home through town, (25 mph) I let it idle in the garage for about 1 minute. Fresh off the highway stopping for gas is a full 2 minutes+.

Me too. Every time.

Universeman · **Posted:** Mon Mar 19, 2007 3:33 pm

I wish I had an EGT gauge tho, or a turbo timer theres been talk about them around here as well. I tend to only be semi concious of the whole cooldown thing as well but I don't think I'm abusing my turbo either.

prairiedog · **Joined:** Sun Mar 11, 2007 2:35 pm **Posts:** 15

Universeman wrote:

I wish I had an EGT gauge tho, or a turbo timer theres been talk about them around here as well. I tend to only be semi concious of the whole cooldown thing as well but I don't think I'm abusing my turbo either.

I drive off the highway onto a 50mph road..then right into my driveway..and imediatly turn off the jeep...what am i harming exactly..anyone know?

BVCRD · **Posted:** Mon Mar 19, 2007 4:10 pm

Oil in the turbo bearings is burned (Coked).

BiodieselJeep.com · **Posted:** Mon Mar 19, 2007 8:17 pm

Consider the ORM (unpluggin the MAF). Drastically impoves cool-down (see thread).

prairiedog · **Joined:** Sun Mar 11, 2007 2:35 pm **Posts:** 15

BiodieselJeep.com wrote:

Consider the ORM (unpluggin the MAF). Drastically impoves cool-down (see thread).

what thread?

BiodieselJeep.com · **Posted:** Tue Mar 20, 2007 10:12 am

Only the BEST thread EVER on this forum!

http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=13299

skip around and search (it is VERY long). Basically, unplugging the MAF closes the EGR and cuts the cool-down time in half or so. Among other, wonderful things..like closing the EGR and giving you a seriously nice power boost!.

:twisted:

Go ahead, young skywalker, unplug the MAF and feel the unlimited power coursing through you...

yes...yes....

prairiedog · **Joined:** Sun Mar 11, 2007 2:35 pm **Posts:** 15

BiodieselJeep.com wrote:

Only the BEST thread EVER on this forum!

http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=13299

skip around and search (it is VERY long). Basically, unplugging the MAF closes the EGR and cuts the cool-down time in half or so. Among other, wonderful things..like closing the EGR and giving you a seriously nice power boost!.

:twisted:

Go ahead, young skywalker, unplug the MAF and feel the unlimited power coursing through you...

yes...yes....

Yes I unplugged the MAF 2 weeks ago and love how the jeep performs...learned that trick in the "Official Kill the EGR Thread" that has since been deleted ..too bad ..lots of good imformation in that one..I'll read the one you suggested also...thanks

BiodieselJeep.com · **Posted:** Wed Mar 21, 2007 1:01 pm

Yes, that thread was deleted because de-activating the EGR is not legal for on-road use. However, the Official Off Road Mod thread looks suspicously like the original theadand contains some of the cool-down info....

You can learn the darnedest thangs on the internets...

barnez224 · **Joined:** Fri Jan 19, 2007 11:28 am **Posts:** 130

In the winter I let it cool about 30 seconds, if that, since it's getting fed cold air anyway but in the summer I follow the OM pretty religiously because the engine is working in more extreme conditions.

oldnavy · **Posted:** Wed Mar 21, 2007 11:49 pm

barnez224 wrote:

In the winter I let it cool about 30 seconds, if that, since it's getting fed cold air anyway but in the summer I follow the OM pretty religiously because the engine is working in more extreme conditions.

And just how much cooler is the exhuast in the winter? :roll:

Outside air temp has little to do with turbo cool down my friend, as a EGT would show you. Well maybe if yiu are north of the Artic Circle in winter. :wink:

chadhargis · **Posted:** Fri Apr 13, 2007 11:25 pm

If you are supposed to "cool" the turbo, then why in the world doesn't the Liberty have a turbo temp gauge? How in the world am I supposed to know if the turbo is hot, warm, or cold? How am I supposed to know when it has cooled off?

Am I expected to pull in my driveway and just sit there for 2 or 3 minutes. My wife would think I'm crazy. Same thing going to work. If I'm running late, do I just sit there and wait, or risk cooking the turbo?

I've read about delayed shutoff devices. Are these worth the money? How do they work?

Cowpie1 · **Posted:** Sat Apr 14, 2007 1:42 am

I have been using turbo diesels for several decades. I do like most here, I just moderate my power application over a short distance to the house then shut it off.

I have posted this before, but it seems to get missed. Check this out, especially Myth #7.

http://www.bankspower.com/tech_TD-fact-Fiction.cfm

If not cooling down for a minute or two after stopping caused all kinds of problems, then why did my last Cummins 435 go 1.4 Million miles before I got rid of it and NEVER had a turbo problem. And I rarely let it sit and cool for a couple of minutes before shutting it down. Only in cold weather when I was using the engine to warm the cab and sleeper did it idle. I have 240K miles on my present 475 cummins and do the same thing... just let it cool down on the descent from highway speed and moderate power to my stopping point then shut it off.

Of course, there are those here that will disagree. That's ok. When they get the decades of experience I have driving Turbo Diesels from the Rio Grande to above the Arctic Circle, They might learn a thing or two.

chadhargis · **Posted:** Sat Apr 14, 2007 9:02 am

Thanks for the information on the cool down.

So if I'm just commuting from work, and not acclerating hard or doing sustained high speeds, then I really don't need to cool down at all?

If I'm towing a trailer in the mountians, I should drive slow the last few miles to allow the turbo to cool.

I will be running synthetic oil, which according to the info you posted, doesn't "coke".

Turbo Cool Down???

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