Higher EGTs than normal.
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Posting Guru
Joined: Mar 2008
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From: Dongola, IL
Higher EGTs than normal.
Ok, I have been seeing higher egts while towing recently. Most recent, a trip back from Chicago pulling a 95 Reg. cab. 4x4 F350 5 spd. (new project).
I was running against a decent headwind, (when I drafted a semi, it cut down the EGTs about *100) I had trouble keeping it under 1000 on flat ground without drafting, I know 1000 is not going to hurt anything, but with my previous truck it wasn't this high. The fuel mileage sucked! (about 12.5, when I would normally get at least 15)
I know my injectors are crummy, and Thanks to Jim at Rosewood, I will have Stage 1s by the end of next week!
So I am wondering if that will cure my issue, maybe the nozzles are spraying poorly....? Anyway, is there something else that could be causing this?
I can get 15psi of boost EASY, have no exhaust leaks, and am burning winter fuel, which I am sure causes a little higher Egts.
Now if I haven't totally confused everyone.... Any input and ideas are appreciated!
Thanks,
I was running against a decent headwind, (when I drafted a semi, it cut down the EGTs about *100) I had trouble keeping it under 1000 on flat ground without drafting, I know 1000 is not going to hurt anything, but with my previous truck it wasn't this high. The fuel mileage sucked! (about 12.5, when I would normally get at least 15)
I know my injectors are crummy, and Thanks to Jim at Rosewood, I will have Stage 1s by the end of next week!
So I am wondering if that will cure my issue, maybe the nozzles are spraying poorly....? Anyway, is there something else that could be causing this?I can get 15psi of boost EASY, have no exhaust leaks, and am burning winter fuel, which I am sure causes a little higher Egts.
Now if I haven't totally confused everyone.... Any input and ideas are appreciated!
Thanks,
Postmaster
Joined: Nov 2005
Posts: 3,168
Likes: 10
From: San Ramon Ca.
More fuel makes more heat. What RPM are you running when you see your peak temp? No intercooler involved. Even though you are making good boost I'd look deeper for an air leak. Presuming the gauge and thermocouple are good. Where is your thermocouple installed?
Hotshot
Joined: Jun 2007
Posts: 10,008
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From: Austin, TX
I'm betting that the intake plenums are leaking just a tiny bit, but if there are absolutely zero boost leaks, I would say check ICP b/c low ICP will cause a little higher EGTs. If that checks out, injector nozzles might be able to cause the EGT problem. Since your getting stage 1's anyways, see what happens after you change injectors, then mess with it if EGTs are still high.
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Posting Guru
Joined: Mar 2008
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From: Dongola, IL
More fuel makes more heat. What RPM are you running when you see your peak temp? I was cruising at 21-2200 rpm (65ish mph) No intercooler involved. correct. I don't have it installed, yet...) Even though you are making good boost I'd look deeper for an air leak. I guess it is possible, but it builds it fast and holds it. Presuming the gauge and thermocouple are good. Where is your thermocouple installed? Driver's side manifold.
I'm betting that the intake plenums are leaking just a tiny bit, but if there are absolutely zero boost leaks, I would say check ICP b/c low ICP will cause a little higher EGTs. If that checks out, injector nozzles might be able to cause the EGT problem. Since your getting stage 1's anyways, see what happens after you change injectors, then mess with it if EGTs are still high.
Will report back once they are changed.
I am saving for a chip...... Still can't decide who's tunes to get.
P.S. sorry for the tardy response, I've been very busy with work lately. Thanks for the replies!
Fleet Owner
Joined: Aug 2004
Posts: 20,418
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From: AZ
The head wind was in eastern Colorado pulling a 42' enclosed car hauler. It was empty, thank goodness, it was pouring rain and 40-50 mph head wind. I've had hard pulls before but nothing like that. I went all day like that, if the trailer had been loaded, it might have been time for a motel, LOL. Mileage, I didn't even want to know! My speed was based 100% on what the EGT gauge said and of course, being in the right gear.
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Joined: Sep 2003
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From: North East Ohio
12.5 mpg towing a F-350? I'd say that's not too bad.
As for temps, were you running different tunes in this truck vs the other truck?
IMO tuning will make a huge difference.
Different (or blocked?) air filter?
Downpipe on each?
As for temps, were you running different tunes in this truck vs the other truck?
IMO tuning will make a huge difference.
Different (or blocked?) air filter?
Downpipe on each?
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Back in my truck driving days, there were many trips across the plains when I had to drop a gear or two to keep EGT temps under control.
In a semi, a head wind is hard going.
But a 1/4 wind, like over the left front or right front corner seemed even worse, probably from how the wind was interacting with the trailer front as well as the tractor front.
Also remember, a 40 MPH head wind against a 60 MPH truck speed is like running 100 MPH on a calm day.
In a semi, a head wind is hard going.
But a 1/4 wind, like over the left front or right front corner seemed even worse, probably from how the wind was interacting with the trailer front as well as the tractor front.
Also remember, a 40 MPH head wind against a 60 MPH truck speed is like running 100 MPH on a calm day.
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Thread Starter
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Posting Guru
Joined: Mar 2008
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From: Dongola, IL
Stock tuning on both trucks, downpipe on each, running 6637 filter on this one, K&N on the previous one.
FOREIGN GURU
Joined: Jul 2006
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From: Celaya, Gto. MX
(sorry I couldnt resist).
Thread Starter
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Posting Guru
Joined: Mar 2008
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From: Dongola, IL
See the K&N lets enough dirt through so that cools the EGTs and somehow increases the fuel economy 
Postmaster
Joined: Nov 2005
Posts: 3,168
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From: San Ramon Ca.
Engine and transmission mounts been replaced? Good synthetics in the tranny, TC and pumpkins? U joints changed to serviceable and well lubricated? Carrier bearing good? Sticky calipers? Wheel bearings repacked?
Just throwing some MPG stuff at ya Ian.
Just throwing some MPG stuff at ya Ian.
