Sawyer1

Just got the truck on Oct. 30th so I am not too familiar with it yet but it seems that my exhaust temp is awful low going down the road when it is in the minus temps outside. The EGTs are at low 600 - 650 degrees. My old 12v used to run in the 700's. Is this because of the intake system on this truck and isn't that a bit too cold for proper fuel burning?
Is there some way to bring up the exhaust temp?

Jeff in TD

You could run a winter front, but I wouldn't be too concerned.

gcssr

Where is the EGT probe located before or aft of the turbo;;

Sawyer1

It is before the turbo.
I have the grill blocked off with a few air holes in the middle for the fan to stay cool.I don't have the lower opening above the bumper covered,would that perhaps help?

Jeff in TD

Personally, I don't think 600 degrees when running around empty in cold weather is anything to worry about, or unusual for a 24 valve CR.

If you pull a trailer or decent grade once in a while, I'd think it would get hot enough then to burn off any deposits.

Steve-l

Those temps are actually higher than mine. At start they are 350 to 400F quickly rising to 600F when engine is cold at under 30mph flat & level. Once the thermostat opens and ecu leans out the motor, the temps drop to 400-450. Once at running temps, flat & level at 60 mph, they go to 600. From there the temps rise and fall between 450 and 1100 depending on load and speed. My truck is a 2004 without Cat, so it uses a two event injector cycle (pre & main). Your truck has a Cat and uses a three event injector cycle (pre, main & post). The post is used to keep the Cat up to temperature. In my truck, to a very large extent, fuel economy is in direct relationship to EGT. I see 20-21 mpg, I will bet my *** you don't.

Sawyer1

Well you just lost your *** cause I have been getting average 21mpg and as high as 27mpg under ideal conditions, but mostly 21-23. Don't know what it will be like in the summer once temps are higher.
Temps are supposed to start dropping tonight for a few days so will see how that effects the EGT.
Thanks for all the replies.

CRToney

Sawyer seeing 600 F is a good thing. It means you're getting good milage. Try a smarty Jr. If I could see 6 psi and 600 F all the time I'd be tickled. My previous trucks would run less boost but the same pyro temp. Going downhill my egt will go below 300 F. I max out egt at 1200-1250 this is at 37-38 psi on both my 03 & 05. Some guys say EFI live is better for 06-07 trucks as well.

steelblitzkrieg

I am guessing you are using imperial gallons as your mpg, because there is no way that can be achieved on a US gallon.

I'm not even sure that 27 can be achieved on imperial gallon.

My best tank when stock was 20mpg with a tail wind and I was stealing from a rig in front of me while coming from 7K down to sea level. Since an imperial gallon is 1.20 US gallon, I would have achieved 24mpg.

Sawyer1

Yes that is using imperial gallons. Today I went into the city and got 21mpg on the way there but then everything (diff and trans oils) was a bit cold from sitting overnight in minus temps but coming home later( after driving around the city for an hour ) I got 23mpg. Now that is driving the speed limit(62mph or 100kms) with the cruise on and my edge tuner set on level 3.

Jim O

I also question that The best I ever got with mine in the summer on summer fuel with the dyna trac hubs turned off and with my gear vendors overdrive turned on in 6th gear in my manual trans was 25.63 miles to the imperial gallon. That was between Edmonton and Calgary at 68mph. or 110kph. I live 15 miles from Edmonton and after fueling up and resetting the over head I can get to Edmonton and the overhead will show 23 - 24 mpg US. but that is no way to figure fuel milage.
Jim O

Spooler

Those temps are normal for 04.5 to 07' 5.9 trucks at cruising speed.

Steve-l

My stated mileage is in US gallons or 10/11 liters per 100 kilometers +/-. Trucks newer than early 2004 use a 3 injector event cycle and use more fuel than the earlier firmware. EGTs are also higher on the newer models. When comparing mileage between trucks, many factors enter into consideration, so it is very difficult to do. I can state that the 6 gun installation was worth 1 mpg all on its own, as it advances the injection in the engine cycle. With the earlier trucks, a common mod was to mechanically advance the crank sensor mount for a similar effect. Of course these trucks are not very aerodynamic, so speed severely increases consumption. In my truck, the optimum speed is 48 mph. At that speed, on the flat and level, with no wind influence, I see 400-450 F EGT. At 60 mph in the same condition, I see 600 F and a drop in mileage of about .5 mpg. At 75 mpg, I see 650-700 F and 16/17 mpg.

Sawyer1

I agree that speed plays a very important part of fuel milage cause as soon as I up my speed from 60mph to 65mph the mileage drops considerably and even more so if I drive at 70mph, so I usually stay at 60mph as I am never in that big a hurry to get anywhere.