Exhaust Temps

[HBarlow]

The 2004. 5 and later ISB5. 9s were tested by Cummins to run at full load, full power, for extended periods of time at a maximum egt of 1400° to 1425° depending on altitude. My '06 showed exactly that egt under full power and full load conditions. They'll run all day like that without hurting a thing.

 

[NavyDood]

There isn't a common/standard testing method on how the different years have been tested. Each design change was done in a different way.

12v and early 24v - 1250°F sustained as long as you want.

03/04 - 1350°F sustained as long as you want.

04. 5 to 07 - 1450°F for extended intervals.

07. 5 and newer - During regen and towing 1600°F could easily be reached. The 6. 7 engine and turbo are designed to take those temps.

 

[AH64ID]

Seems a little high on the hills empty unless you really have your foot on the throttle. I use my EGT to drive with when pulling my Toy Hauler, I can easily run 1400+ on grades. I run a Smarty on level 5 when towing.

If your running any timing on SW5 but TM1 you are asking for a melted piston. With added timing on SW5 I would limit your continuous to 1250° and peak to 1300°. With the stock turbo and the 70hp tune you will run out of air at about 4-5K feet, and the 100hp tune at 3-4K feet when towing heavy. I'd back off the power, or get more air.

I went back and check the settings and it was on Towing at 99 or full power so I backed it down to 70 and will try that and get back to the forum with the results. Also I still have stock exhaust, should I up grade to a more open system?



Thanks for all the responses.

PoD will not effect cruise temps at all. It does limit total power. On my Smarty Jr PoD 70 reduced the total power above 2300ish rpms, but below 2300 the same power was made (on the dyno). I would set the PoD at 90 and leave it alone, it will still make 100% of the power but have a smoother pedal. For towing I would not go below 90. PoD doesn't just reduce the power available, it reduces the effectiveness of the pedal. So PoD 70 doesn't allow for full throttle operation and thus you may have issues if you try to pass someone and need the rpms. The power falls off very fast, at 2300 rpms I was making 325rwhp (same as PoD99) but by 2500 I was down 50 rwhp, and 175 rwhp at 2750 rpms. You can see my dyno chart here. So long story short, is PoD doesnt change how the power is made, just how much you can make. I run PoD85 normally, and PoD70 on dirt and in the winter. Without testing your load I wouldn't go below PoD90 so you don't limit yourself.

Ok guys, here is some more info after doing a few test runs with different settings.

1. Totally stock - on flat ground 7-8 lbs of boost and exhaust temp prior turbo is 700EGT

Totally stock - Going uphill about a 5% grade 28lbs boost and 1050+ EGT

Totally Stock - Going uphill about a 5% grade 30lbs boost and 1250+ EGT @ WOT



2. Smarty set on towing (99) FULL POWER - on flat ground 10lbs boost and 600 EGT

Smarty set on towing (99) FULL POWER - Going uphill about a 5% grade 30lbs boost and 1050+ EGT

Smarty set on towing (99)FULL POWER - Going uphill about a 5% grade 36+lbs boost and 1100+ EGT @ WOT



Any Thoughts would be appericated

Looks perfectly normal for a Smarty Jr. Your stock WOT EGT's are a little lower than expected thou, but that's probably from a short WOT burst. Sustained load at WOT would produce EGT's up to 1450°ish.



What timing setting are you running?

The 2004. 5 and later ISB5. 9s were tested by Cummins to run at full load, full power, for extended periods of time at a maximum egt of 1400° to 1425° depending on altitude. My '06 showed exactly that egt under full power and full load conditions. They'll run all day like that without hurting a thing.

There isn't a common/standard testing method on how the different years have been tested. Each design change was done in a different way.



12v and early 24v - 1250°F sustained as long as you want.



03/04 - 1350°F sustained as long as you want.



04. 5 to 07 - 1450°F for extended intervals.



07. 5 and newer - During regen and towing 1600°F could easily be reached. The 6. 7 engine and turbo are designed to take those temps.

One VERY important thing that neither of you mentioned is those numbers are ONLY good on a stock truck. The timing/fueling has been changed over the year to meet emissions. That change has made for higher EGT's, but lower cylinder (piston) temps. So while a stock 2004. 5 can run 1450° and not hurt anything if the OP tries that with the added timing of a Smarty Jr then he can hurt his motor. Since the timing of the Smarty is more similar to older engine timing I tell people to limit their continuous temps to 1250° and momentary to 1300°, just like a stock 2nd gen. It's very possible that a stock 3rd gen at 1450° has a lower piston temp than a stock 2nd gen at 1250°. I have no way to test it, but looking purely at the timing I would believe it.



EGT's are what we measure because it's easy. What we care about are cylinder/piston crown temps.

 

[granduer]

AH64ID, I am not sure what the timing is, I think its set on 2 and torque is 2. But without going back and checking again not 100% sure. All I did was hook up Smarty and set it to towing mode.

 

[AH64ID]

Your numbers sound fine.