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Old 03-14-2003, 05:42 PM   #29
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Diesel upgrades

Chas,
Sounds like tinkering with the PSD got you where you wanted. The used F250 I drove was either a '99 or '00 ext. cab short bed black with gold two tone paint. Sharp looking truck and that is what made me test drive it. Other than no get-up-and-go, the back seat was a fold down that resembled our stiff gym mats at work. Whoever rides back there has sore buns in short order. The '01 V-10 ext. cab had a nice rear seat with more room.

I would say that GM will tinker with the Duramax as far as programmer or bigger turbo to increase performance so that they can keep up with the other automakers.
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Old 03-14-2003, 07:31 PM   #30
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Hmmmmmmmmm diesels run cooler? My 6.5 heats up everytime it sees a hill. Have all kinds of work done to get it fixed. I realized that this overheating is probably unique to the 6.5.

I am planning to trade this one off for an 8.1 in the next couple of weeks.

The other thing I'm looking forward to is not having to sit in my Surburban while the turbo cools.

To me the diesel is nice if you do lots of long distance driving, Diesels like to run but as an in-town vehicle it's a pain.

I've also thought about replacing my motor if it ever came to that and its cost $6,700 just for the motor. In understand that a replacement duramax if $12,000.

Sorry I don't see the economics, I do agree that it does save fuel resources - which is a good thing.

Just thought I would give the persective of someone who has diesel and going back to gas.
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Old 03-14-2003, 09:10 PM   #31
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Not sure I like the smell of any exhaust, but to each their own.

Diesels do not run cooler.

I'll have to take your words on the off the line power of the new diesels. But I still find it hard to believe that a diesel has more SOP (seat of pants) performance off the line than a 7.4L or 8.1L.



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Old 03-15-2003, 01:15 PM   #32
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Eric,
You have the same feeling about the diesel vs 454/496 that I did. The pickuptrucks.com forum was talking about the Duramax vs 8.1 and I can't remember which magazine did the test. Some members on that forum apparently wondered also so they did their own tests and found that the Duramax held its own with the 8.1 pulling ahead by a couple truck lengths in the 1/4 mile (best I could remember). I have head a lot of discussion about the Allison transmission not transmitting all the 8.1 power to the driveline as it should. This was done, according to speculation, to cut down on drivetrain abuse and subsequent warranty work. I don't know but a trip to that forum might give more insite. Johnhd spends time there and maybe he might remember what they called it, something like "drivetrain management".
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Old 03-15-2003, 09:25 PM   #33
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"My 6.5 heats up everytime it sees a hill. Have all kinds of work done to get it fixed. I realized that this overheating is probably unique to the 6.5."

I've not heard this. Mine ('94) certainly does not. Coolant temp has climbed as high as 225 pulling up a 12% grade in summer with trailer in tow. The only time I worry about letting the turbo cool is on the extremely rare instances where I turn off the highway and immediately into a parking lot, or pulling the trailer up a large hill, and immediately arrive at my destination. Usually by the time I have waited through a light, or gotten through an intersection, and certainly by the time I have the trailer pulled/backed into place on leveling blocks, the turbo has had time to cool off.

Mark
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Old 03-15-2003, 10:00 PM   #34
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Nope not waiting as long as you should. I had a hot rod with a 2.3 pushing 18psi of boost and did in plenty of turbo's. My wifes dogging it and parking it didn't help either.
The big problem with turbos is the shear heat. If they are hot the oil cokes or boils on the bearing if it's not flowing. On start up this will sometimes blow the bearing and seal out. The flowing oil does just as much to help cool these as the water. Really more because it cooles the impeller shaft where the water cools the housing. The first turbo's were not even water cooled just oil cooled.
The seconday problem is since one end of the impeller is in the relitively cool intank path and the other in the intense exhaust is once you do shut them down the difference in the heat from one end of the turbo housing to the other is different and it will warp the impeller shaft. Keepingthem spinning helps keep them true till they cool.

I'm really surprised that so few people use "Turbo Timers" on deisel trucks. The hotrod turbo car crowd has used these for a long time an it's usualy the first upgrade they do. It goes a long way to help prevent premature turbo failure. It's a timer that delays the engine shutting down so you can get out and go without having to wait for the turbo to cool. It lets you lock up the truck and set the alarm but will let the vehicle idle for 2-3 minutes. If somebody opens the door to try to steal ithe truck it kills the engine. Most can be tied into the alarm systems and dely their automatc arming or if the alarm triggers before a door is opend it shuts down at that point. Not expensive at all when you concider a Turbo cartrage (just the impeller and center If your buying a whole assembled turbo your paying to much) will set you back at least $300 just for that part. If your not able to do the install yourselft it's a easy $800 repair at the typical shop.

www.google.com and put in "Turbo timer" and your city and should pull up a number of shops that sell them local. Or find a online shop. Bet you could get them from Banks as well.
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Old 03-15-2003, 11:21 PM   #35
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Toaster,

I've got 150k miles on the original turbo in my 95 Powerstroke and have never had any problems with it. I change the oil every 5,000 miles and use either Rotella or Delo. I think you are referring to engines which had turbos added to them, hot rods with gas engines and the like and being such they probably have insufficient oil supply and run much hotter than the diesel to begin with. I guess you are talking about an SVO Mustang?

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Old 03-16-2003, 07:02 AM   #36
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Quote:
Originally posted by Chas
Toaster,

I've got 150k miles on the original turbo in my 95 Powerstroke and have never had any problems with it. I change the oil every 5,000 miles and use either Rotella or Delo. I think you are referring to engines which had turbos added to them, hot rods with gas engines and the like and being such they probably have insufficient oil supply and run much hotter than the diesel to begin with. I guess you are talking about an SVO Mustang?

Chas
Close, Merkur XR4Ti. Same engine.
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Old 03-16-2003, 07:44 AM   #37
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Mark

I also have a 94 6.5 - its in perfect condition, but on long grades in Colorado it gets up to about 240 or more degrees rather easily. I've been told that heat is the killer of these engines, so I've tried all kinds of stuff and has not worked. Following the diesel pages, this seems to be a problem with these engines. I've received all kinds of opinions on how to fix/improve it but at this point since its a buyers market for vehicles, I've opted to just get a new one with a monster (gas) motor.

Ken J.
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Old 03-16-2003, 08:20 AM   #38
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Do you undertstand the 6.5 overheating problem to be general or altitude related? In know of many here in Missouri, and whatever other problems they may have, overheating has never been one of them. These engines are used in a lot of high stress situations (every Humvee ever made, Chevy Stepvans).

In re: cooldown. "Nope not waiting as long as you should". Waiting for what? These are very low boost turbos. Too low, by some people's estimates. If it hasn't cooled down in 10-15 minutes of low rpm, low load idling and creeping through a campground, it ain't gonna cool down in another 10 min. of idling. Mine is original, never rebuilt, and I turned over 160,000 mi. yesterday.

I do realize, of course, that other turbo motors are different.

By the way, you will not hear me extoling the virtues of the 6.5. I hold only that they are a decent engine capable of giving quite acceptable service - you just don't want to pay much money for one.

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Old 03-16-2003, 08:36 AM   #39
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I don't know if high altitude is causing it or not....However, everything I have read is that these engines are prone to heat.
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Old 03-16-2003, 08:45 AM   #40
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I don't profess to be an expert on the 6.5 but have heard that the early to mid 90's models did have a problem in regards to overheating. They supposedly fixed it in the late 90's. A friend of mine had a 95 GMC dually with the 6.5 and it would run hot at times. It was a great truck, got better mileage than the Powerstrokes but not nearly as much power. I heard that some people had ruined their engines by installing fog lamps into the air intakes in the bumper. Guess they need all the air they can get.

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Old 03-16-2003, 10:28 PM   #41
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My 454 chevy truck gets 10 mpg naked. 6 to 7 mpg towing.
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Old 03-21-2003, 12:09 AM   #42
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87airstream345 ,


..... I almost forget I'm going deaf because the engine is putting out 135 decibles at anything over 55 MPH.



It might make you feel better to know that my big block gaser is loud enough at 65 for me to wear ear plugs. Forget the CD player.
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