How high is too high for EGT's. What damage will accure if 1500 is hit for short time- 10 seconds? What's the limit/

 

I think anything over 1250 sustained is too hot. I don't think hitting 1500 for 10 sec hurts anything.

 

I thought JQmile was saying he hit 1800° for a brief period the other day when he dyno'd. I could be wrong about that though. I do know he, and others, have said they will hit 1600° at the end of the strip, but it will cool down pretty quick once they throttle off. As Mike T. said, anything above 1250° sustained is asking for trouble . Some folks'll say 1300°, but personally I'd prefer to err on the side of longevity.

 

im pretty sure 10 seconds isnt enough time to hurt anything at 1500... is your truck hitting that temp with an he351 and stock sticks?

 

I've hit 1500 quite a few times in my truck. But they were all only for a few seconds, I buried my pyro once racin and hit 1800 but that was only for a few seconds too. My truck still runs fine and doesn't seem any different. I think Cummins says anything over 1250 and your pistons start to melt. But I think you gotta hold it there for about a minute to start meltin it down. I don't think 10 to 20 second sperts of 1500 won't hurt it, just make sure you let it cool down before you shut the truck off or you can kiss your turbo bye bye... don't ask me how i know

 

Mine pegs the pyro pretty easy in 4th and 5th. I'm not saying it's a good idea, but it's still running good after 3 years with the same setup.

 

I had a 96 5 speed truck with a #10 plate and 370's and it would peg the gauge before you got out of 1st. I aways ran fine never had any problems with it. I ran it that way for 3 years peggin the gauge a least 3 times a week, offen more. I dont recomend this, the truck was a beater and I wont do that to either of the trucks I have now.

On a side note, could be related to the egt problem that truck had. It had some serious blow by. Im about 85% it was from the high egts cause when I got the truck and it was stock it hardly had any. When I sold it it would burn a gallon of oil between oil changes.

 

Yes. It was at the end of a 1/4 mile full throttle assult. I'm wondering if pods, or ddp and a retune of the pump woould make a difference.

 

i dont know about anyone elses trucks but i couldnt hit 1200 with the stock sticks, pump cranked and stock turbo.

 

Guys not trying to steal the thread but my probe is installed in the exhaust down pipe (not by me) instead of the manifold. Whats a safe temp to read if the probe is there? Thanks

 

That all depends, some guys say there is a 250-300* differance between the two. I think It has more to do with the turbo you have on there in what the temp differance really is. I think most say 850-950* is max with down pipe temps. I cannot tell you really when I bought my newest single cab It had a DP probe. I kept the rule of thumb I have read and never got over 850*. But I've since changed the probe locations but also did alot of other work so I couldn't tell you how much differance there was between the two probe spots.

 

I have gotten a lot hotter than that. I know I was around 1250 the last time I towed. I need to get a better setup!

 

I read an earlier thread that stated "autometer pryometer gauge needs to grounded right to battery enstead of a body ground." Think this would make mine read high. It reads 350-400 at idle.
Ideas?

 

Just drill and tap the manifold for the probe and move it there and put a plug in the dp. That will be alot safer 1250 in the dp sounds like trouble.

 

PODs will make it run a little hotter, but I was surprised by not much higher. It will just get hotter faster. They definately make decent power though, it sounds like you have about the same setup as me. What have you done to your wastegate on your HE351?