Question About 02 7.3 Powerstroke

[macdaddy]

A friend of mine has a 2002 7. 3 PSD F-250 Crew Cab Long Bed. He has one of the Edge tuners on it (not sure which one). His exhaust pyrometer for EGT's is mounted after the turbo.



What is the max EGT with this set up?



Mac

 

[HBarlow]

Probably around 900*. The rule of thumb I have always heard is post turbo pyro probes are about 300* cooler than the exhaust manifold.

IMO, a downstream pyro is a little better than nothing but more aggravating.

 

[macdaddy]

Thanks Harvey... .



Mac

 

[Wingate]

I've got mine immediately after the turbo in the elbow. EGT gets to about 1200* when pulling extremely hard at 32-34 psi boost on long uphills...

 

[macdaddy]

I've got mine immediately after the turbo in the elbow. EGT gets to about 1200* when pulling extremely hard at 32-34 psi boost on long uphills...

Thats interesting.....



1200 degrees after the turbo?. What temp does the pistons see?



Mac

 

[HBarlow]

EGT is approximately 300* higher at the exhaust manifold than post turbo. The cylinder temp might be a even a little higher but there is no way to measure it that I have ever heard of. The distance traveled from upper combustion chamber to center of exhaust manifold on cylinders 3 and 4 is only about 4" to the pyro sensor if mounted in the center of the exhaust manifold.

 

[Wingate]

Thats interesting.....



1200 degrees after the turbo?. What temp does the pistons see?



Mac

dunno,... . Let me elaborate a little... . Truck was loaded with a trailer that had a total weight of between 25-28K... . Truck running the 3rd gear with convertor locked, running about 55-60 mph... started up a LONG hill that has two chicanes (spelling??) back and forth. When I committed to the hill and the engine took all of the load (as evidinced by the IMAP hitting 34psi) The exhaust temps rose to about 1K POST turbo. . As I made this long pull up the hill, I DO NOT let off. . I believe that although I read 1k post at this point, at the cylinder ports, its likely running 1200 or so. . The hill is so long and I have to keep her at full boost for so long, The turbine housing and exhaust adapter finally get heat soaked to the point that it creeps us to a full 1200 degrees... . I realize that my post turbo temp sampling is not as responsive as a pre-turbo pyro... but I find that as I have worked the truck, I find the information it provides very repeatable and credible... My decision for a post turbo pyro was two fold, I did not want such a little portion of thermocouple in the exhaust port and I have seen what happens to a turbo if that thermocouple breaks off... .

Typically, running loaded locally, it never gets over 900-950... Its basically only one road and when I am making that trip to haul hay... which is only twice a year. .