EGT temp check
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Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
EGT temp check
I realized today that I don't have a good baseline on what EGT's should actually be. First diesel and first RV I've towed with it. I'm not convinced that I don't have boost leaks or other issues. The RV is a 30' travel trailer with a V-nose front.
I was towing at sea level on flat ground. Ambient temp was about 75 to 80. I noticed that my EGT's tended to be between about 975 and 1050 depending on the grade. I had the cruise set on 60 or maybe 62. Do these temps seem normal? I have a feeling they're a little high, but having nothing to compare them to, I just don't know.
I was towing at sea level on flat ground. Ambient temp was about 75 to 80. I noticed that my EGT's tended to be between about 975 and 1050 depending on the grade. I had the cruise set on 60 or maybe 62. Do these temps seem normal? I have a feeling they're a little high, but having nothing to compare them to, I just don't know.
Posting Guru
Joined: May 2013
Posts: 1,199
Likes: 2
From: Oklahoma
Andy,
You'll get a lot of comments over in the 7.3 forum. I can tell you I have dual EGT probes, one in each exhaust manifold. I watch them closely when driving. The Excursion sees an even 700 in flat roads with ambient temp around 80 running 70-75 mph.
If I pull a trailer and back off to 65-70, I see 900. Pulling a grade will move up to 1000 and then cool off on the down hill.
The Super Duty guys see cooler temps and I believe it's because they aren't has heavy as the EX. I have three EX's in the family and they are consistent in almost all aspects including EGT's.
Based on what you are showing when pulling a 30' camper, I believe you are doing good. I'd suggest you let it idle down during breaks to help cool your turbo and Pistons off, the last thing you want to do it kill the motor with high temps and let it sit.
Hope this helps.
You'll get a lot of comments over in the 7.3 forum. I can tell you I have dual EGT probes, one in each exhaust manifold. I watch them closely when driving. The Excursion sees an even 700 in flat roads with ambient temp around 80 running 70-75 mph.
If I pull a trailer and back off to 65-70, I see 900. Pulling a grade will move up to 1000 and then cool off on the down hill.
The Super Duty guys see cooler temps and I believe it's because they aren't has heavy as the EX. I have three EX's in the family and they are consistent in almost all aspects including EGT's.
Based on what you are showing when pulling a 30' camper, I believe you are doing good. I'd suggest you let it idle down during breaks to help cool your turbo and Pistons off, the last thing you want to do it kill the motor with high temps and let it sit.
Hope this helps.
Logistics Pro
Joined: Jan 2014
Posts: 3,595
Likes: 17
Agreed on the above.
I see on average 750-800° cruising at 75-80mph on the freeway. Actually across the board on freeway speed, as long as I'm cruising and maintaining a speed it's typically my MPH plus another '0' equals my EGT.
Around town I average 550-700° depending on the nature of the traffic. Idle across the board once warmed up is 375-400° regardless of outside temperatures (not that we have a huge spread in Houston).
Flooring it spikes EGT's beyond 1600°, however I never keep it there longer than 25-30 seconds. Been doing that for well over two years and absolutely zero problems have come from it. Then again, I'm not drag racing everything that acts like a badass.... just most of them
I see on average 750-800° cruising at 75-80mph on the freeway. Actually across the board on freeway speed, as long as I'm cruising and maintaining a speed it's typically my MPH plus another '0' equals my EGT.
Around town I average 550-700° depending on the nature of the traffic. Idle across the board once warmed up is 375-400° regardless of outside temperatures (not that we have a huge spread in Houston).
Flooring it spikes EGT's beyond 1600°, however I never keep it there longer than 25-30 seconds. Been doing that for well over two years and absolutely zero problems have come from it. Then again, I'm not drag racing everything that acts like a badass.... just most of them
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
From what you are reporting, your EGT's are normal based on my experience.
It would not be a bad thing to conduct a pressure test to confirm the lack of leaks. If you found one and fixed it, it could lead to an improvement in performance/economy.
It would not be a bad thing to conduct a pressure test to confirm the lack of leaks. If you found one and fixed it, it could lead to an improvement in performance/economy.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
If you have an OBDII scan tool/gauge (like Torque Pro or FORScan), you can log the readings on your MAP and Exhaust Back Pressure. That might tell you if there are any air leaks.
1250 degrees is the big red line, assuming your sensor is on the manifold - not closer to the turbo. Anything below 1200 is a go, just don't crowd 1250 for more than a minute or two. 1600 degrees at WOT is hot, but it still takes a little time for heat soak to occur in the exhaust. I'm not so sure that much heat is a good thing on the pistons and valves, though.
I can reach about 1300 while burnin' tires with 100% nozzles, but it's been a long time since I tried.
1250 degrees is the big red line, assuming your sensor is on the manifold - not closer to the turbo. Anything below 1200 is a go, just don't crowd 1250 for more than a minute or two. 1600 degrees at WOT is hot, but it still takes a little time for heat soak to occur in the exhaust. I'm not so sure that much heat is a good thing on the pistons and valves, though.
I can reach about 1300 while burnin' tires with 100% nozzles, but it's been a long time since I tried.
Laughing Gas
Joined: Oct 2013
Posts: 861
Likes: 7
From: AZ
Looks good to me.
Lower rpm lugging = higher exhaust temps
If that were my truck and I turned the overdrive off at 60mph then the rpms would jump to 2600 and the egt would come down to around 900-950.
I either tow 55mph in drive or 70mph in overdrive. Anywhere in between is a little too fast for drive, or a little too slow for overdrive.
Lower rpm lugging = higher exhaust temps
If that were my truck and I turned the overdrive off at 60mph then the rpms would jump to 2600 and the egt would come down to around 900-950.
I either tow 55mph in drive or 70mph in overdrive. Anywhere in between is a little too fast for drive, or a little too slow for overdrive.
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