Excessive EGT's

[AH64ID]

Very good point. Usually when the grade steepens and if I have to drop to 4th and the load and EGT's go down as I am not having to work nearly as hard. Thou I am not silly heavy, only about 18K but its a tall barn door.

I don't see any difference in EGT's from humidity, thou there is rarely enough around here to measure. I do see a slight change as temperature increases. I have seen a report that states for every 1° increase in IAT the EGT's go up about 1. 5°. I would buy that as a general rule in the 70°-110° range, below that it doesn't seem to have much effect until it gets REALLY cold. The biggest effect comes from altitude, the higher I get the hotter I run. Last time I was in the Seattle area I was shocked how low my EGT's were, probably 100° cooler on a WOT run, if not more. I have enough turbo for towing WOT up thru about 6,500-7,000 feet, on a 75° day. As I exceed that I can't quite go WOT, but close enough for most uses. The only time I get close to EGT limits is pulling grades in OD, drop to 5th and all is good.

 

[DogramTD]

Exhaust leak fixed, ended up replacing the AFE with a BD manifold. Havent pulled with it yet but planning a trip labor day weekend up to devils tower monument then into rapid city; we will see then. I still have a feeling my issues havent changed. This turbo also makes a weird noise, one I have never heard before; sounds like a hair dryer outside of the truck while under hard acceleration.

Ive tried checking for boost leaks by capping the intake tube and pumping it up with air... didnt find leaks but I also couldnt even get 20# in the system, it was coming out of the blow by, not alot but enough to keep the pressure from building up.

The first 40K miles of the trucks life had an AFE oiled filter... have these been known to contaminate the CAC? My thoughts are, oil residue from the filter enters the CAC and leaves a film. Then the little dust devils come along and stick to the oil film and in effect degrades the ability to transfer heat. . Just a thought. Is there a way to clean these out?

 

[SierraRam]

Wont be a problem if you haven't over oiled them. Does the intake tuibe to the turbo have a grimey build up?

 

[DogramTD]

I honestly dont remember since I changed it out a couple years ago. Its probably not an issue, just a thought.

 

[cerberusiam]

The first 40K miles of the trucks life had an AFE oiled filter... have these been known to contaminate the CAC? My thoughts are, oil residue from the filter enters the CAC and leaves a film. Then the little dust devils come along and stick to the oil film and in effect degrades the ability to transfer heat. . Just a thought. Is there a way to clean these out?

Yep and nope.

ANY oiled filter contaminates the system eventually, especially if you push the boost higher than just normal cruise. Its a possible problem area.

As small as the passages are its not easy to clean. Same as a radiator, unsolder the tanks, boil and rod it to clean thoroughly. Cost benefit is the question.