Gassers run hotter because the fuel is still burning on the way out the pipe, they're running very rich compared to a diesel. All that fuel coming in with the air helps keep things cool enough inside the cylinder, on a diesel air comes in dry and just gets hotter things in there.

The Cat in my work truck has steel topped pistons, it's safe to 1200 or so post turbo. Supposedly the turbine will fail before the pistons do.

 

I just had gauges installed today. Link below shows where pre-turbo pyro is installed. If I hammer it from any speed, I see it hit 1200 as fast as the tach hits 3000. It falls back to 800-900 as soon as I let up.

I thought this thing ran hot, now I know it does.

http://dodgetruckworld.tenmagazines....-1-album-14466

 

At 1780 degrees its extremely lean, my diesel is rich as a pig, hence black smoke. Can a diesel be tested to check the A/F ratio? If so I will hook up my buddys wideband...