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Hot truck, why, high boost, bad IAT, cooling issue???

JiFaire said:
Actually, No, Tim... like I said, I bought the damn pan and then when my TCC Lock provided the last little thing I needed for cooling, I sort of lost the urge, and I never got around to installing it. I kept telling myself "next time I change fluid, it's going on"...

...guess who hasn't changed fluid lately?

I am such a bad man. I haven't hauled through the mountains for 2 years, so really didn't need the extra cooling - lots of that kind of stuff has been waiting for me to get my butt in gear, and now I'm probably selling the truck/trailer this spring, so I might not get around to it, anyway.

Gonna be one heck of a garage sale.
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Losing the urge at your age is dangerous Jim, don't want to turn your wife into a "cougar" do you?:D At your age a fluid change wouldn't hurt either.):h

Sorry, couldn't help myself.

Leo
 
Leo, Leo, Leo... there is gonna be a day of reckoning, buddy... when you least expect it.

It's not that old guys don't forget, 'cause we do... it's just that we remember everything at the darndest times... :D
 
JiFaire said:
Leo, Leo, Leo... there is gonna be a day of reckoning, buddy... when you least expect it.

It's not that old guys don't forget, 'cause we do... it's just that we remember everything at the darndest times... :D
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LOL, just a word of advise, it's just things I ponder on at my age, just a reminder to you.:thumbsup: In case you forgot.:rolleyes5:

Leo
 
Acesneights1 said:
Just ordered the deraile. 104$+shipping
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Aces,
Letmeknow if it fits right or not. The one I got when my trans went bad wouldn't fit right because it was hitting the filter/pickup and not seating against the case flange. I think they sent me the wrong one but I lost all my paperwork on it so no way to return it. I'm thinking I may cut my extra stock pan and this one and weld them together to make it deep enough to fit. I remember seeing something about there were 2 different types of pickups/filters for the 4l80e but can't say for sure.
 
Aces -

If you are doing the hood scoop for looks, then yes by all means.

If you are trying to fix the overheat condition with it, then no.

IMHO, I think that you are barking up the wrong tree with the aux tranny cooler, but I could be wrong.

Bill Heath may have said that 14PSI is okay, but did he tell what IAT that corresponds to? As I tried to say before, 260 is REALLY hot even for a GM-4. My suggestion is that if you find out why that IAT is so high, then you will find the answer to all (or most) of your issues with this truck.

When I was FEMA towing with my '98, the consensus from the knowledgable masses (on that Other Board) at that time was that 12 PSI was the practical limit for my GM-8. And that was only because it was December through February time frame.

Regards,
 
The data I have on the replacement turbo thread Gary shows when IAT even with the ATT starts really climbing fast above 12 psi, and 10-11 on a hot day with my GM-8, add in the 30F reduction when intercooled and the temps start getting + 200F fast.
 
Remember those discussions ,More boost (more cooling air )produced lower inlet air temps up to certain pressures ,but going higher wjith boost produces opposite effect (higher iatemps) .Now starting to understand why (characteristics of stock turbo}.
 
D-T I think you've got the gist of it

As Jim said previously It's a balance more is better to a point, until that boosted air itself is a heat source requiring post compression cooling (IC or WMI) remember your old tee handle style tire pump, grab the base after a few pumps and that is hot (same heat of compressed air BTW that makes a Diesel self ignite when atomized),

So too much un-cooled turbo compressed air is a bad thing, plus driving the turbo hard beyond it's design efficency(back pressure) also ups the ante for making the engine run hotter.
 
Thanks Doc, I was trying to over simplify ,I guess, & blame the GM turbos design for everything heat wise.
 
No for what it was designed to do be a light duty Diesel, the GM turbos & programming did what it was intended to do, it's when folks took attitude "It's a Diesel, I ought to be able to pull anything with it I want", IMO is where things started going wrong for the 6.2/6.5 anytime up up the performance envelope, or add more weight than it was designed to pull you have to add in extra stuff past what designers anticipated, I dare say the DMax et als, other Diesels would not be where they are had it not been for lessons learned hard way on older Diesels all mfrs, GM was only one that got it right early on power (some) and emissions better than the rest with DS4'd trucks. As bad as the 6.5 was the IDI'd 6.9 & 7.3 if you'll go back and look at those they were pretty anemic as well.

Turbos on a Diesel are a must IMO, if you want bigger power you'll have to run up the turbo or get a better matched one, and past a certain point you'll need some sort of post compression cooling.
 
Turbine Doc said:
No for what it was designed to do be a light duty Diesel, the GM turbos & programming did what it was intended to do, it's when folks took attitude "It's a Diesel, I ought to be able to pull anything with it I want", IMO is where things started going wrong for the 6.2/6.5 anytime up up the performance envelope, or add more weight than it was designed to pull you have to add in extra stuff past what designers anticipated, I dare say the DMax et als, other Diesels would not be where they are had it not been for lessons learned hard way on older Diesels all mfrs, GM was only one that got it right early on power (some) and emissions better than the rest with DS4'd trucks. As bad as the 6.5 was the IDI'd 6.9 & 7.3 if you'll go back and look at those they were pretty anemic as well.

Turbos on a Diesel are a must IMO, if you want bigger power you'll have to run up the turbo or get a better matched one, and past a certain point you'll need some sort of post compression cooling.
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To sum it up, Tim, there was just no "head room" designed into the performance envelope of the 6.5 turbo diesel (from the factory). The pump is limited, the turbo is limited (GM-X), the blocks, heads and cranks, are limited. As much as I love 'em, the 6.5TD was definitely designed as a "light-duty" diesel.

Regards,
 
Its probably a good thing that the pumps can't be modified to output more fuel.... We'd see alot less of these around if they could.
 
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