I'm a noobi here, but I'm getting ready to order a QC HO 6-sp. I spent some time on the 'other' site, till the stuff they were going thru with the new engine scared me away....<br><br>One thing they had was an &quot;AIC&quot;, Automatic Idle Control. It could be set to shut down the engine AFTER you turned off the key &amp; locked the door, once the temps got to where they were supposed to be.<br><br>Does DC have anything like that, or is it not necessary??<br><br>Thnks for any info!

 

Not necessary, IMHO.<br><br>Cummins has a 'fast idle' feature built in to its engine controller that ups the idle when the engine gets too cool. It can also be programmed (I understand) to run on fast idle on three cylinders to speed warm up.<br><br>I didn't know that the Ford AIC was a shut down device, too. Anyway, I consider that unnecessary. Unless you pull right off the interstate after running 80 mph, the turbo will be cooled down enough to shut it off as soon as you park.

 

Thanks, cp; on the Ford site, they talk about the AIC allowing the turbo to cool enough not to fry the thing before the engine actually shuts off.<br><br>Everything I read here makes me happier &amp; happier to have decided to go Cummins...<br><br>

 

<br><br>I'd be careful assuming that EGT's are cool enough to shut down without sufficient time to cool. The only time my EGT's are low enough to shut the truck off immediately upon stopping is if I idle through my neighborhood for about 1/2 mile and this is not towing a load. If you're going to be towing a medium/heavy load you're going to want to idle your truck for at least a minute or two unless you have a pyro to be sure the temperatures are low enough. Most people I've talked to have suggested that 300 degrees is the highest temperature you would want to consistently shut down your truck. I would say that, without a load, 30 seconds of idling has the temps down to 300 or less.

 

[quote author=parshal link=board=20;threadid=12404;start=0#119994 date=1048549120]<br><br><br>I'd be careful assuming that EGT's are cool enough to shut down without sufficient time to cool. The only time my EGT's are low enough to shut the truck off immediately upon stopping is if I idle through my neighborhood for about 1/2 mile and this is not towing a load. If you're going to be towing a medium/heavy load you're going to want to idle your truck for at least a minute or two unless you have a pyro to be sure the temperatures are low enough. Most people I've talked to have suggested that 300 degrees is the highest temperature you would want to consistently shut down your truck. I would say that, without a load, 30 seconds of idling has the temps down to 300 or less.<br>[/quote]<br><br>Where did the 300 degree figure come from? If that's true, UPS ought to go through turbos faster than Opra going through pork chops. Any UPS mechanics here that can state what their turbo failure rate is? <br><br>I've owned diesels since 1972 and have never babied them like that and have never had a turbo failure from it. (I have had one fail from foreign object damage, but never bearing failure.) The only time I give it time to cool down is, as I said, if I've been running WOT on the interstate and pull directly off into a parking area.<br><br>This may have been more of a problem in the old days before good oil.<br><br>

 

CP the 300F comes from the upper limit of non-synthetic lubricating oil before it starts to literally decompose from heat. The engines turbo when shut down no longer is fed cooled oil to its bearings causing coking. Coking is the result of burned oil by heat from the exhaust manifold/turbo housing being above the upper limit of the oil around the turbo shaft and bearings. Coking can be a one time thing or multiple hot shutdowns, UPS may be using reseve surge oil tanks to prevent this. PK

 

While I do let my turbo diesels idle a few minutes after highway driving, I had a '87 F*rd Ranger turbo diesel and the big joke with that truck (company truck) was to goose the throttle just as you shut it down. The turbo would continue to spin and howl for quite a while. Beat the crap outa that truck, puts tons of miles on it, and never had a turbo failure. It hardly got any cool down after driving, and would idle all day if we needed the air compressors.

 

Gadgets, I too almost bought a Ford/PSD. The AIC option was useful in idling the engine up to keep her warm to help avoid wet-stacking (winter AND summer); and if you had a PTO device attached to the engine and needed more power than idle. In the 7.3's, the AIC didn't have a feature to shutdown the engine based in Turbo Inlet temps. I didn't think it was a feature for the 6.0 either. That auto shutdown feature is available aftermarket. Some guys like to use their AIC's in the summer to elevate the rpm's to both keep the engine warm and permit the AC system to perform better if the truck will be sitting for a bit.

You can purchase an aftermarket electronic &quot;AIC&quot; for our trucks. A stick works too (my method).

300F is also a figure I've heard when shutting down the engine. I'm not running any guages so I let her idle a minute or so for cooldown, up to about 5 minutes if I need to stop for fuel on the turnpike when pulling the boat. Its mentioned in the owners manual I think.

UPS trucks around here that I've seen were gas. I remember working there in the late 70's putting myself through college when the new policy came out back then on shutting them down during stops to save gas. We thought that we'd be replacing starters left and right. Didn't amount to any difference.

BTW, I love my Dodge RAM CTD!

 

[quote author=P Kennedy link=board=20;threadid=12404;start=0#120042 date=1048559417]<br>... Coking is the result of burned oil by heat from the exhaust manifold/turbo housing being above the upper limit of the oil around the turbo shaft and bearings. Coking can be a one time thing or multiple hot shutdowns, UPS may be using reseve surge oil tanks to prevent this. PK<br>[/quote]<br><br>Has anyone seen coked turbo bearings? I've flogged my diesel cars and trucks for 30 years (never observing the shutdown rule unless, except as I stated earlier) and have never had a turbo problem, nor have I known anyone who has. I'm not saying it can't happen, just that I never have seen one and if it is as important as we are lead to believe, either it would a.) be a commonplace problem, or b.) I'm the only person who doesn't observe the shutdown rule and have just been lucky. Somehow, I gotta think there's at least one other bozo out there who, like me, doesn't idle his engine for X minutes before shutdown and hasn't had any problems.

 

<br><br>Yup. Guess you didn't learn to flog them properly like we did in the Navy. ;D <br><br>#2 EDG (Emergency Diesel Generator) 12 cyl DD lunched one of its turbo's during an OPPE (Operational Propulsion Plant Examination). A show stopper; a nightmare if you were the Engineering Officer. I worked for him as Auxialliaries Officers. Funny thing is, that diesel was never worked hard - it was impossible to load that generator more than 50% w/o doing some major reconfiguration of the electrical plant. Trend analysis required 80%. The inspectors weren't even off the ship and I had a Chief &quot;borrowing&quot; a turbo off a sister ship moored a couple of piers away in San Diego. The following day the inspectors did peel away some of the lagging off the subject turbo and noted that it &quot;appeared&quot; to have changed color during the night, but more importantly, noted that it performed well. Even better: A-Gang had liberty that night; the BT's and MM's never left. {Hey Pistolwhipt, things don't change much do they .....}<br><br>That was the only time I that ever had a problem. I also had 4 Detroits in 3 boats that worked great. Boats were always a PIA to maintain.

 

Bulabula,<br> LONG LIVE THE FRESH AIR SNIPES !!!<br><br> The last time I saw that deisel, it was tore down to parade rest for the INSURV inspectors to look at. They had a couple whiz-bang enginemen that slapped her back together overnight and she was purring like a kitten the next afternoon. .. at least until the s/w cooling line blew filling the space w/about 6 inches of water. <br><br>(sorry about the sidetrack ... can't resist a good sea-story)<br><br>PISTOL

 

Pistol, were there any stories left about Jesse James? He was incredible, you wanted him on our side. That being said, I saw him get get Command Advanced all the way to E-6; then get &quot;Command Advanced&quot; back down to E-3. Those were the days! <br><br>My apologies for getting off thread here. Those Fresh Air Snipes hold a special place for me.

 

I had an old FxxD 6.9er with an aftermarket turbo that I ran especially HARD one day, climbed the hill from the colorado river up directly to Flagstaff. Towing over 10 grand in trailer and loaded for moving, had over 1000 pounds in the box and truck full of kids and dogs. It was 110 degrees at the river and 85 or so in Flagstaff. Never took the foot out of it, never let it below 1000 nor over 1250 degrees during the whole long climb, it had to be over 2 hours at that temp that turbo had never worked so hard. I pulled off the road into a rest area. At this point I was worried about the temperature thing. I idled for maybe 3 minutes and it was under 140 when I shut down, therefore they cool fairly quickly by my experience. <br><br>Note:Half throttle with the HO is more power than the 6.9er ever had. I think 3 minutes should do well. Looking forward to the EGT gauge on my HO though.

 

Thanks to all who replied!!<br><br>Lots of good info here; I guess common sense should prevail - idle a bit after a heavy pull; less is no load.<br><br>Makes sense.<br><br>Now, we'll just have to go order that bad boy to test this out!<br><br> ;D

 

:My Jacobs Exhaust Brake allows for a faster warmup, and will open up at idle when temp(water) gets to normal. I would like to know about the pyro gas temp probe/guage? I am new to this and like to make it last?