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,

 

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?

 

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.

 

After the stage 1's get a chip with good tunes, I think that would help. I've run mine against a head wind all day with EGT's at 1,200.

 

Thanks for the ideas!


Sounds like great advice! I can't wait for the new injectors! Will report back once they are changed.

I don't want to know what kind of fuel economy you got that time

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!

 

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.

 

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?

 

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.

 

Ya, that's when the EGT gauge is your speedometer!

 

I know the mileage may not sound that bad, but I got 15-17 doing the same thing in my previous truck (same exact truck, model wise, as the one in my sig now)

Stock tuning on both trucks, downpipe on each, running 6637 filter on this one, K&N on the previous one.

 

Well get rid the 6637 filter and get a K&N and thats it !!.
(sorry I couldnt resist).

 

I Thought someone would jump on that See the K&N lets enough dirt through so that cools the EGTs and somehow increases the fuel economy

 

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.