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So I have an 08 Peterbilt 386. It has been smoking when the regen kicks in.. Couple times I got a check engine light for a D'P'F temperature being too high (or something like that) Apparently when it smokes on regen it means that something is wrong with the D'P'F.


Well I pulled it off and it had small cracks on the rear etc.


Got a good wifi connection and after a couple min my truck has been freed from future headaches. D'P'F got 5 (2 3/8") holes. Need to go pick up new gaskets tomorrow.

For people that are curious, I attached my "Lets Truck" app results. This is mostly 65mph, pulling average 30k in a dry van.


Oil change is due in about 2k miles. Cant wait to see what the future holds for me :blush:

(10-26-2016 )Aleeex Wrote: [ -> ]....
D'P'F got 5 (2 3/8") holes.
...

Bad move grandpa --- WHO is the idiot that told you that a bunch of small holes would be ok? -- You need that thing to BREATHE, and NOT REFLECT THE HEAT!!!... A single 8"+ hole (taking out all but an inch around the outside) is what is needed to let all the heat out. -- A bunch of small holes is NOT nearly the same thing!. It is not AIR you are trying to let out so much as it is 900+ degrees HEAT!.


You got a pyro and boost gauge on that thing? -- What are they getting to max?

I've yet to drive it far enough to know. I did see the boost around 35-36. Should know a little more later today.


I did the holes like that to muffle the sound a little. I'll probably end up punching a big hole in about a week.

And M just to M clarify. 2

Ah big holes and sound something I can relate to

I just did this with my Pete and c15. had small holes drilled, I just baffled the tank and put full flow mufflers on. Truck likes it better. Rumbles good but isn't loud.

So I have about 1200 miles on this so far.. can't say anything on mileage yet..

I put the egt probe in the dozer housing right behind the turbo.

But I think I will need to go to a large hole. Egt is in the 600 range cruising. I don't like that . Full Boost stays around 33 on average.

Egt climbed to 900 on hwy 80 in utah. I let off and kept it in neighborhood of 800.


BTW truck is set to 500 and 1850

Large hole should lower egt and raise boost. I like the noise myself.

Some of us are based in Republic of kalifornia