intake temp too cold
#1
Registered User
Thread Starter
intake temp too cold
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?
Is there some way to bring up the exhaust temp?
#4
Registered User
Thread Starter
#5
Registered User
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.
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.
#6
Registered User
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.
#7
Registered User
Thread Starter
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.
Temps are supposed to start dropping tonight for a few days so will see how that effects the EGT.
Thanks for all the replies.
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#8
Registered User
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.
#9
DTR Detective
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.
Temps are supposed to start dropping tonight for a few days so will see how that effects the EGT.
Thanks for all the replies.
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.
#10
Registered User
Thread Starter
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.
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.
#11
Registered User
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.
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.
Jim O
#13
Registered User
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.
#14
Registered User
Thread Starter
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.
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