Excessive EGT's

[LNaugle]

have you adjusted the smarty for the injectors? is there a possible leak in beteen the turbo and exhaust manifold?

 

[DogramTD]

There is a leak between the turbo and ex manifold; which I intend to addrfes when i get home. The probe is pre-turbo, do you think any leak post turbo would effect the temps pre-turbo?



I have played with all smarty options i could. It has finall cooled down a bit since I have dropped down in elevation (4500 ft) SW1 Tm4 Tq1 RP2. Also cranked the WG all the way down to make sure DP wasnt being screwed with.



Want to take it to a good place to get tuned... any suggestions for colorado/wyoming area?

 

[cerberusiam]

Too much of a leak between the trubo and manifold will drive EGT's up, been there done that. It just depends on how bad it is but it doesn't take much to drop the drive pressures enough to make a difference, in both quantity and quality of air.



The 1400-1500 on a stock tune is not too surprising with bigger injectors,altitude, etc. If it gets that high when you have the timing advanced with the Smarty then it is an isssue.

 

[AH64ID]

definitely check your probe. what egt does truck idle at? i recognize you have a problem but that motor was built to maintain 1400-1450 egts... have proved it more than once towing out of phoenix to flagstaff with 2 rockcrawlers on a fifth wheel. still no problems with that particular truck. one time we passed a power joke pulling a 3 car hauler which was empty... . should have seen the look on his face!

They can maintain 1450° with stock timing, but add some timing and try 1450° and you will melt something. Piston temps on the stock tune are very low, but EGT's are high. On a tune with timing the piston temps are high and EGT's are low.

There is a leak between the turbo and ex manifold; which I intend to addrfes when i get home. The probe is pre-turbo, do you think any leak post turbo would effect the temps pre-turbo?

I have played with all smarty options i could. It has finall cooled down a bit since I have dropped down in elevation (4500 ft) SW1 Tm4 Tq1 RP2. Also cranked the WG all the way down to make sure DP wasnt being screwed with.

Want to take it to a good place to get tuned... any suggestions for colorado/wyoming area?

The temps you are seeing on the stock tune are normal. They run 1450° with stock sticks, and you have 60's. Your probably trying too much with the Smarty.

I was in Yellowstone last summer and saw warmer temps going up to 8K feet than normal, that's just how it works with hot/thin air.

I would try Revo (not TNT if you have that) SW1 TM2 TQ1 RP1 and see what happens. Are you on the latest software, May 16th? RPM's will be your friend when towing with that turbo at elevation. 2200-2500 is probably the best range.

You also need to address that exhaust leak, leaking exhaust doesn't spin the turbo.

 

[DogramTD]

Too much of a leak between the trubo and manifold will drive EGT's up, been there done that. It just depends on how bad it is but it doesn't take much to drop the drive pressures enough to make a difference, in both quantity and quality of air.



The 1400-1500 on a stock tune is not too surprising with bigger injectors,altitude, etc. If it gets that high when you have the timing advanced with the Smarty then it is an isssue.

Ex leak isn't bad enough to leave soot on the flange but bad enough that I have to leave eb off until i really need it due to the most annoying ear piercing sound in the world it makes!

They can maintain 1450° with stock timing, but add some timing and try 1450° and you will melt something. Piston temps on the stock tune are very low, but EGT's are high. On a tune with timing the piston temps are high and EGT's are low.







The temps you are seeing on the stock tune are normal. They run 1450° with stock sticks, and you have 60's. Your probably trying too much with the Smarty.



I was in Yellowstone last summer and saw warmer temps going up to 8K feet than normal, that's just how it works with hot/thin air.



I would try Revo (not TNT if you have that) SW1 TM2 TQ1 RP1 and see what happens. Are you on the latest software, May 16th? RPM's will be your friend when towing with that turbo at elevation. 2200-2500 is probably the best range.



You also need to address that exhaust leak, leaking exhaust doesn't spin the turbo.

I am on the latest software... seemed to run hotter at the egt with lower tm setting; but you say piston temps are cooler there. I'll try it. I have been spinning the motor up between 24 - 2700 rpm which is 40 - 42 lbs of boost...

 

[AH64ID]

The lower the timing the hotter the EGT. On the latest software TM4 is the least advanced and TM2 is the most advanced, which is why I recommended TM2.

 

[NIsaacs]

You also need to address that exhaust leak, leaking exhaust doesn't spin the turbo.

The OP said his leak was post turbo, not that it's a good thing, but...



Nick

 

[cerberusiam]

The OP said his leak was post turbo

Ummm, not from his description. However, lacking a solid soot trail it may not be pertinent.

There is a leak between the turbo and ex manifold

 

[AH64ID]

Without a soot trail it probably seals up with heat, but the pressure and lack of big heat with the exhaust brake may find it's way thru.

 

[NIsaacs]

There is a leak between the turbo and ex manifold; which I intend to addrfes when i get home. The probe is pre-turbo, do you think any leak post turbo would effect the temps pre-turbo?





Cerb & AH641D,



Oops, my bad. I zeroed in on the last part "leak post turbo" and read on the first part "turbo and ex-pipe"... not manifold, I see and read things that aren't there sometimes:-laf



Nick

 

[LNaugle]

Basically you need to fix the leak then report back... . seen this before... . not just dodges...

 

[DogramTD]

I have the AFE Bladerunner Staninless Ex Manifold... Made it home and pulled it to address the leak; found #6 leaking badly and #1 with a mild leak. The manifold is warped . 045 in, worse than the stocker was when I replaced it and that was the reason for replacement...



I will look into the pulse style manifolds; any suggestions?



AH64ID: I tried your smarty setting of SW1 Tm2 RP1 TQ1 but it seemed to run a little hotter than the setting I had, so I went back to SW1 TM4 RP2 TQ1; still ran hot but more manageable.

 

[AH64ID]

I would fix your exhaust leak before messing with settings.

I like my ATS manifold, bought it used and sealed with single layer steel gaskets.

 

[GSchroder]

Thats why I went to compunds. I have a POD set at 5 and can hardly get the temps to 1150* pre turbo. Going across Rockies not a problem.

 

[AH64ID]

Thats why I went to compunds. I have a POD set at 5 and can hardly get the temps to 1150* pre turbo. Going across Rockies not a problem.

PoD on 5 or SW5?



I would hope with twins the EGT's would be cooler than that! I run about 1150-1200° towing big passes with a single, maybe 1250-1275° above 7K feet in OD when WOT.

 

[Gonzo 1066]

My 04. 5 would run 1450 completly stock when it was new. I called Cummins tech, the fellow there told me that with the piston cooling jets and excessive oil through them 1450 is normal with this engine. I spent several thousand dollars in modification to mine, now it is hard to top 1325 even on hard hard dry climate pulls.

 

[AH64ID]

My 04. 5 would run 1450 completly stock when it was new. I called Cummins tech, the fellow there told me that with the piston cooling jets and excessive oil through them 1450 is normal with this engine. I spent several thousand dollars in modification to mine, now it is hard to top 1325 even on hard hard dry climate pulls.

That is their answer, but I can tell you that the retarded timing is what keeps the piston temp down. If you try to run advanced timing (any tuner) and run it up to 1450° things will melt. Are you running any tuning?

But yeah a little more air is easy to bring the stock EGT's down. I can't break 1200° on a WOT run without towing with my current hard parts mods, can't be anything by good for the motor. With timing and the airflow I have a real hard time breaking 1225° on hot days on 6%+ grades.

 

[Gonzo 1066]

But you see that I consider 6% grade in the northwest a easy pull. Hard pulls for me are 14a in northern Wyoming. 13 miles that average 10% and in places top out at 13% grade. My combined weight is just over 23,000# I almost never use my 04. 5 without a loaded trailer, but when I do I never see more than 1100 degrees. Just a few percent humidity makes a HUGE difference on EGTs.

 

[AH64ID]

I agree 6% is where a hill starts, even some of the easier hills around here have 10% sections.

What is the A-fe Juce?

 

[NIsaacs]

I don't really see any difference when pulling a 12% grade versus 6%, just a different gear is all. If I pull any given grade with any given load at max power, it's max power. I don't see much difference with weather conditions either, the cooler it is the better it runs and the bigger the fire, same temps. At cruise power, I do see a difference. Probably my post pyro



Nick