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Very high egts towing..

A

Acesneights1

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Northeast CT
Last weekends trip with new Heath Tune and TM is now making my egts very very high. It I down shift to 3rd climbing a grade the boost hits about 15 and the egts run right up to 1300+. WTF ?? I knew I should have just fixed the vac pump. This is exactly what my Tahoe did after installing a TM.
FYI:
IP replaced last year(PO), Reman injs(accurate Diesel), remote PMD, New fuel lines. Hollowed out kitty with 4inch ex cut into it. Flowmaster downpipe abd crossover and NO EXH LEAKS(Pulled the friggin head to fix it.)
TDCO -1.50
The exact same thing happened to my Tahoe. It towed fine with no real temp problems until I put that damn TM on. I seriously think it's causing too much backpressure. what else could it be ?
I have an Autometer Pro series Pyro drilled right into the ex manifold under the turbo so the numbers are right.
 
I don't know, It wasn't off the shelf. I told him what I wanted and he reprogrammed my ecm. I sent it to him since the truck was going to be down anyway for a few days while I dealt with that ex manifold nightmare but it should be equivalent of the GLE. Bill is away so I can't talk to him. The truck is drivable but I really gotta watch the egts climbing hills. I have to back out of the fuel alot At one point I had to drop the truck to like 50-55 mph up a grade. It could easily have pulled better but the temps were going nuts.
 
Stock round filter(which is a good setup). No IAT's. I don't have a bi directional scanner for an OBD2 yet. You think it's the IATs or is it too much backpressure from the TM ? I did not have a problem until I installed it. Although the truck was also not tuned either.
 
one of the other ways I've been considering is a behind the bumper set up. LMC has a bumper that has a fairly long grill in it. That in conjunction with a long narrow intercooler. It would still let air into the cooling stack too.
 
Kenny I feel your pain. I was having the same problem with mine. It would shoot up to 1200* like a tach, at about the same boost to.
I got mine down to 1000/1100* after reprograming with a 3 tune chip and straight piping the exhaust and new rad.
I know I don't tow as heavy as you but I hit fancy gap and pull 5000lbs. up that grade at 65/70mph with no more than 1100 sustained with 14 lbs. of boost and with dmax fan and new rad it doesn't go past 210*.

It sounds like you need to have Bill either put more timing in it or lower the fuel rates.
I'm running more advance and fuel than stock and only go to third if I'm below 2.200 rpms, that and above seems to be my sweet spot while towing.

Lowering the boost to 10lbs. while towing helped me keep the egts below 1200, which was about 8 max when not towing.Now that the tune is straightened out I run 14lbs. and still stay around 1000* on the egt.
I know I'm new to this whole deisel thing but I feel I've been in your shoes since I bought mine, It's always one friggin thing after another, But I'm almost to the finish line now. I learned one thing about the 6.5, when it kicks my butt keep kicking back and I'll get it licked,especially with the help of all the people here.
 
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I'm going to add W/M and that should keep me at 800/900* towing steep grades.
Also since the tune was done if I go from tow to economy I drop about 100/200 on the egts so I know it's defueling and lowering my egts.
I'm thinking if I get an att and diamond eye the truck will be perfect .
 
I dunno kenny. I can't explain your high EGTs. The most i've ever had behind my truck was ~7K, and in 3rd gear towing up an almost 5% grade, my EGTs never touched 1000*F and i held 50 mph fine(speed limit 45). Truck maxed at about 12-13 psi boost, but it was blowing a good bit of gray-ish black soot from the pipes. I turned the TM up a tad since then, and that cleaned up the smoke but the EGTs were a little higher running 14/15 psi boost over 12/13 max sustained.
 
How much weight, Kenny? I was pulling 9800 up some pretty serious hills in high ambients with my TM and no lasting EGT issues...

Oh, I could drive them through the roof if I wanted, but I just backed off a bit, stayed locked (TCC) and drove by the EGT gauge.

Mind you, I was doing it with 3.73s and a towing chip (maxetork 2)... if you have a GLE tune from Bill, it should help keep your temps down. If you have the power tune, then not so much.

PS - injectors? age, type? Bill steered me away from HiPops because I was pulling so much weight.
 
The trick with the TM is to back off the boost to under 14. That OD pull with the TCC locked up, yeah trailer, is the high boost point. Stay in it long enough and the boost will creep up on you. But this full load pull in 4th is what you need to set the TM properly. Without the sustained load you wind up setting the TM too high. Those that never tow can crank the nut on the TM down more and never notice.
 
Camper is around 8000lbs all loaded up plus I had the quad in the bed of the truck. I hit higher egts if I down shift. If I leave it in OD it won't climb but feels like I'm luggin it and the engine temps will climb a little faster.
 
Hard to say. Vac pump may have not been working since i bought the truck and I installed gauges to verify boost issue. I guess what I am sayiong is I have no data towing pre TM and Reflash but truck did not run hot AT ALL and I towed in 100 deg heat. Last trip was mid 70s and it hit 210 many times.
 
Acesneights1 said:
Hard to say. Vac pump may have not been working since i bought the truck and I installed gauges to verify boost issue. I guess what I am sayiong is I have no data towing pre TM and Reflash but truck did not run hot AT ALL and I towed in 100 deg heat. Last trip was mid 70s and it hit 210 many times.
Click to expand...

In that case (if it were me) I'd probably call Heath and see what they thought of the problem.

Since they built the tune and the TM you have in the truck, they can probably give you the best advice on whether it's the new parts or a previously existing issue compounding it.

I would advise not going back to the vac system since the tune has been changed for one with a TM (unless Heath advises it).

I believe you'd just end up chasing your tail going back. From most of your posts, I'd say you've had enough fun with that sort of thing to last a lifetime.....

While I run the stock vac system and have no gripes, many here are running a TM with good (sometimes better) results. Your truck should be able to do as good as others, or at least similar.

Yup, I'd start with a call to heath diesel and get their opinion on it. Simply because they know what was done in your specific tune and should know what would "mess it up".....

:agreed:
 
4.10's? You may have more fuel available than my DB2 in lower gears.
 
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