Stock EGT?

[DocDetonancour]

Well I took the advice of the TDR gang and put the probe in front of the turbo. What should the temp be at say 2000 rpm on the freeway and around town stop and go. Truck engine is stock. thanks, doc

 

[DocDetonancour]

I'm seeing 4-5 00 around town. Guage is very responsive.

 

[JRMora]

Running empty at freeway speeds (75-78) I see 400-500° also. Depends on whether I am going uphill or downDriving around town varies - If I am moving slowing (creeping in traffic) it'll drop to 300°.



I took a trip to colorado last week (only about 1500# load - no trailer) and bombing up Raton Pass (passing everything - aren't diesels great ) and the most I saw was 650°



Yes, the gage responds very quickly to changes in temp.



BTW I am preturbo in the 4-5-6 collector just above the turbo.



Juan

 

[nickleinonen]

how the heck are you guys seeing so low numbers? mine is mostly stock [exhaust only] and i see 400° - 700° in the city [depending on throttle] and on the highway i see between 600° 900°... now it will come down to 300° pretty quick when you are sitting at a light, and if you are rolling down a hill in a lower gear [engine braking] i can get it down to about 200°



my probe is pre turbo, at the 4-5-6 end...



??????????

 

[JPereira]

I am also seeing 400-700 using autometer probe and phantom guages. I had installed my egt on the top of the manifold closer to #3 as the notes from Geno's had recomended. Can the location I have be providing the higher temps? Maybe the brand of meter/probe ?

 

[nickleinonen]

well, my pyro is autometer also [ultralite series] and it reacts real quick [can climb as fast as the tach]

 

[ttreibel]

I get 250 on the flats on a cool day climbing hills empty I climb to 700 most the time. I drilled the factory airbox out that helped, looking for a free flowing exaust thats quiet now. For info on airbox BOMB look at my Readers Rig gallery

 

[C600]

I installed a westach dual gauge before leaving this weekend. I have put over 1000 miles on it. I have seen 1200 at wot going up hill. I thought 1250 was the limit. I hope my gauge is off.

 

[DocDetonancour]

Many consider 1100 to 1250 the MAX for extended running for our diesels. Who knows what "extended" is?

 

[InThinAir]

This EGT question comes up a lot. But I will say this, I have no idea how you guys can run these trucks so cool!!!!



I run both trucks with POST turbo probes. And the numbers you are talking about are less than what I see on a daily basis. I have seen 1100 degrees post turbo pulling a load for approx 3-4 minutes. I see 800 on the 01 and 700-750 on the 03 daily empty pulling hills at highway speeds. I get approx 18 mpg on the 01 and 19 mpg on 03, so I am not hammering the go pedal. I see 700 just accelerating to highway speeds on an on ramp with my 01.



So I guess all I can say is that altitude must substantially increase the numbers, like 30-40%. Or I am doing something really wrong with the way I drive.



---Doug

 

[Johnstra]

I'm in CO too and my numbers are close to yours, InThinAir. I see around 400 on flat ground, 600 on slight grades, and will see over 1000 steeper grades. I keep my RPM around 2k.

-john

 

[David Oxland]

My early '04 running at 50 mph steady, with outdoor air temp 70F sits at 500F. and this is just what I wanted to hear. I've been wondering because after comming up a hill to get home and generating 550F at lower speeds I cool down to 280 in about 1 minute.

 

[JRMora]

Originally posted by InThinAir

This EGT question comes up a lot. But I will say this, I have no idea how you guys can run these trucks so cool!!!!



So I guess all I can say is that altitude must substantially increase the numbers, like 30-40%. Or I am doing something really wrong with the way I drive.



---Doug

Note I didn't say I was pulling a load - I would expect much higher with a load behind the truck.



But, since you brought it up, one thing I noticed is that altitude does play a big part in the cool down. I live at 5100' above sea level and work at 4700' above. When I get to work (45 miles of sustained 75-77 mph), my truck cools down to 300° pretty quickly (30 secs or so?). When we were in Colorado - we were at 7200' and it did take sometimes a few minutes to hit 300° after a long run. I assume the less dense air cannot carry as much heat away.



Yes, running empty (on a flat road at 75 mph) I see about 450-500°. As the road goes up, my temps go up. But, as I mentioned before, I have never seen anything much above 650° (Raton pass both ways - I think it's almost 9000' above sea level). I hope I can get my trailer soon and really put it to test.



Juan

 

[C600]

I have read 2 different articles in the TDR mag that say 600-650 is where max fuel economy and efficincy will occour. Mine runs about 700 at the speed i like to drive on the open highway. Are you people with the low temps pre or post turbo?

 

[InThinAir]

Juan,



I would assume you are talking about a probe in the manifold not post turbo. Mine is post turbo, so with a post turbo probe I see 750-800 everyday. If you use a 200 degree differential between the manifold and the turbo I am talking about 1000 degrees empty everyday. I can hit that without trying, not pushing and if I push I can hit 900 running empty with a post turbo probe. I have 2 trucks and these numbers are consistent between both, except the 03 runs about 50-100 degrees cooler than the 01, which is a discussion by itself.



So again I just would like to know what I am doing so different that I do in both trucks. Higher RPMs seems to raise the EGT not lower it, so I cruise at between 1800-2000 RPMs when I am empty.



---Doug

 

[JRMora]

I honestly don't know what I am doing differently. I am pre-turbo about an inch above the turbo in the 4-5-6 collector pipe (my probe sticks out the side of the manifold).



I am using a DiPricol pyrometer with the supplied T/C that I got with the pyro from Genos.



Any more experienced folks have any ideas?



BTW. My pyro responds quickly with the change in load (not slowly rising, but jumping up pretty fast), so I assume it's well positioned.



Juan

 

[Briman]

I have a new Westach with the probe in the same place as Juan's. I can hit 1200 degrees easy going up Parly's Summit (I-80) east of Salt Lake City. This is with a gross weight of around 8K lbs. I also see a low of 250 degrees costing down the same hill.



I think that EGT's can vary tremendously. I understand that stock trucks can run hot.



Since DC wrote the letter to the other member I can't say what my personal experiences are with mods but find it too easy to get to 1200 degrees.



One thing to consider is the cold junction (electrical coupling) of the thermocouple. If you have this close to the exhaust manifold it will show an unrealistically low EGT (don't Dpricol's have a very short thermocouple lead?). If your thermocouple is calibrated at 75 degrees, any degree over 75 (measured at the cold coupling) is proportionally removed from the actual temp (displayed temp is 1 degree low for every degree over 75 degrees at the cold coupling).



I purposely installed my cold junction in the cab to try and avoid some of the display error.

 

[JARichard]

WOW!!! Seems to be alot of differences. I run between 750 and 800 doing 70 on the highway empty. The average temp. here is 90 lately with a 100% humidity. So, to me that makes the less dense theory unusable.

 

[jackcaptjr]

You guys must be iceing down the manifold!!!!!!!



Both my trucks are pre turbo and use the DiPriCol guages. Both trucks now have Banks Exaust and the 04 does run a little hotter than the 99 but not much. Very hard to make comparisons because temps are so sensetive to load and T-pressure. Flat unloaded both are in the 600-700 range but hit 1000 in an instant when you push the T. The 04 is stock and won't go past 1200..... the 99 with the TST "on" will hit 1300+ under load.

My trucks never see <500 under load.



Boost on the 04 runs considerably higher..... 10-15lbs flat no load... ... . The 99 with a 14mm housing runs 3-7lbs under the same conditions.