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Turbocharger cooldown
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=38376		 Page 1 of 1
Author:  liberty2.8 [ Fri Dec 19, 2008 12:22 pm ]
Post subject:  Turbocharger cooldown
Reading my owners manual the other day, there was a section dealing with idleing the engine before shutdown. Does anybody really practice this out there? Depending on the type of driving, there is a 1-5 minute recommended idle time before stopping the engine. What are the advanteges/disadvantages of doing this?
Author:  BlackLibertyCRD [ Fri Dec 19, 2008 12:38 pm ]
Post subject: 
If you are just putting around, not needed, but should do it off the high speed interstate to shopping enter. If it takes a couple minutes to fine a parking space then you don't need to cool it because it has cooled in that time.
Author:  dirtmover [ Fri Dec 19, 2008 1:17 pm ]
Post subject: 
Agreed, I usually do it only after towing or coming straight off the highway for a break. For refuelling I just leave it running.
Author:  geordi [ Fri Dec 19, 2008 3:54 pm ]
Post subject: 
I hardly ever shut it off when refueling, but if I'm towing, then I make sure to leave it running while I'm in the store.

I have both an extra key (no chip) for locking the door, and the remote-starter. Sometimes I will shut it down for just a moment to remove the key, then restart with the remote. That will run it for 15 minutes if I let it go the full time.
Author:  nursecosmo [ Fri Dec 19, 2008 4:11 pm ]
Post subject: 
Absolutely, it is the life of the turbo. I however am seldom in a situation when I park it where it has not had the opportunity to cool down by the time I get to the parking spot. When I get home I have already been driving down a long slow road and decelerate for a long time before getting to my driveway. Same goes for work. Really the only time that I need to do it is when I exit off of the highway for a pit stop or I have been driving downtown in a lot of heavy traffic.
Author:  dgeist [ Fri Dec 19, 2008 4:47 pm ]
Post subject:  Yes, definitely.
After driving the 30-45 seconds down my street, I always leave it idling an extra 30 seconds or so in park once I'm up the driveway.
Author:  warp2diesel [ Fri Dec 19, 2008 11:39 pm ]
Post subject:  Turbo cool down routine
Having an EGT gauge puts reality into perspective. For most of us we live off the highway and have to travel through traffic or along secondary roads to get to our stopping points. I have observed when I tow my trailer, by the time I get off the expressway and into the rest area or fuel station, the EGT has dropped to safe enough level (400F) to shut off the engine. If it is at 900F, I will idle until it drops to 400F before I shut it down.
When I swap out the stock muffler for the Magnaflow I just got, I will keep a close eye on my EGT.
Gauges are a good investment!
Author:  blake1827 [ Mon Dec 22, 2008 6:26 pm ]
Post subject: 
yeah I always let it idle down at least 30 seconds if just arround town. straight off the intersate I give it a minute or two.
Author:  KJ Ash [ Mon Dec 22, 2008 7:27 pm ]
Post subject: 
I always take it easy prior to my destination and if i'm just idling there I will turn off but NEVER shut it off without cool down after a good freeway run.
Author:  Ukraine Train [ Tue Dec 23, 2008 6:33 pm ]
Post subject: 
Anyone running a turbo timer? I knew a guy with a 3000GT that had one, it was pretty slick.
Author:  CATCRD [ Tue Dec 23, 2008 11:29 pm ]
Post subject: 
Ukraine Train wrote:
Anyone running a turbo timer? I knew a guy with a 3000GT that had one, it was pretty slick.


Yes, I have a generic turbo timer I bought from a former member here. Select 1, 3, or 5 minutes. It's nice when you want to run inside a store without leaving the key in it running.
Author:  liberty2.8 [ Sat Dec 27, 2008 9:44 am ]
Post subject: 
Thanks for the info. That is what I thought... that the time in traffic up to my driveway or most other destinations was sufficient for cooldown. Most of us don't drive 70-0 and just kill the engine.
Author:  gmctd [ Sat Dec 27, 2008 12:51 pm ]
Post subject: 
An Exhaust Gas Temperature guage, or pyrometer, the most critical and important upgrade to a Diesel engine, is only ~100bucks, and will easily settle this perennial 'to be, or not to be' question in Diesel noob's minds

- tc cool-down is highly important where the cartridge is not liquid-cooled, and where the cast-iron mass of the exhaust manifold, exhaust elbow, snail, and cartridge is large, as in an 18-wheeler turbo - cooling is not very efficient due to the large ratio of mass to surface-area, which limits convection air cooling

- tc cool-down is important where a 5000lb trailer has just been towed up a 6-mile 6% grade, Engine Coolant Temperature is high, and Boost is required to get the load parked in the parking area - the KJ manifold and tc mass-to-sa ratio is small, allowing quicker natural cool-down, but extenuating circumstances will require cool-down period - an EGT guage eliminates guessing, while increasing over-all fuel economy - cool-down is 0mpg, just like cold-weather warmup

ECT can be a good indicator of higher EGT's, tho burning the AC on a hot day in slow traffic will raise ECT's without raising EGT's

Normal idle EGT is >300* - normal traffic EGT is ~450* - working can be ~650* to ~1200* EGT
- Diesel-rated oil is formulated to survive turbocharger temperatures, and synthetics are even higher-temp rated - gasser (patooie!) oils are not, tho, in recent years, premium oils for those engines have been uprated for turbo service but not nearly to the extent of Diesel-rated oils
- watching the Boost guage ramp up frequently indicates higher EGT's, making the Boost guage equally important for monitoring the life-pulse of a turbocharged Diesel engine

EGT and Boost guages are the most important upgrade you can install to extend driveability, reliability, and longevity of your turbocharged Diesel engine - running Diesel-rated oils, preferably synthetics, is not an option
Author:  JDaPP [ Sat Dec 27, 2008 12:59 pm ]
Post subject: 
CATCRD wrote:
Ukraine Train wrote:
Anyone running a turbo timer? I knew a guy with a 3000GT that had one, it was pretty slick.


Yes, I have a generic turbo timer I bought from a former member here. Select 1, 3, or 5 minutes. It's nice when you want to run inside a store without leaving the key in it running.



What timers are available,how hard are they to install, and what has been the goods and bads of having the timer? My wife is doing most of the driving and she is rather impatient
Author:  05crd [ Thu Jan 01, 2009 5:21 pm ]
Post subject: 
We always allow for a cool down and after following gmctd's advice and installing a EGT it makes it easy to see when it is cool enough. And now instead of guessing we can measure it. Anyone know of a turbo cooldown unit that works off temp rather than time?
Author:  mackruss [ Fri Jan 02, 2009 4:12 am ]
Post subject: 
Can you guys with the fancy guages post some pics of where you have mounted them and how you installed them.
Author:  aandlwoods [ Fri Jan 02, 2009 9:01 am ]
Post subject: 
I dont have them but there are A-pillar gauge pods. I think they may delete the sissy bar though.
Author:  KeighJeigh [ Mon Jan 05, 2009 2:14 am ]
Post subject: 
Never.

My wife loves her CRD but is already bothered by all its rather extensive idiosyncrasies and problems that I am constantly chasing. (engine light went on again yesterday) She is also one of those people in constant motion. (Me too) There is no way she will sit in the driveway tapping her fingers idling the engine waiting for it to cool down - even though we have a steep long driveway and perhaps should during the summer. (although I'm not sure how much it actually engages the turbo when we only drive it 10-20 MPH)
I might be more willing to do such a thing but I am very forgetful and usually in deep thought about something so never remember to do it. I'm one of those people who forget where he parked the car when walking out of the store.

I put top-grade synthetic in them and change twice per year....just because it makes me feel good.
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