Exhaust Wrap

[RUSSELL5000]

I have been reading the forum and seen a number of references to wrapping the exhaust on the 2007.5 through 2012 trucks. I gather the idea is to retain heat in the exhaust so that the DPF will have more passive regenerations and fewer active regenerations.

Has anyone done this, and have you noticed the difference? What all exactly did you wrap? Any concerns on voiding the warranty?

Thanks!!

 

[DonFitzwater]

The only wrap I've heard of and seen is the o2 sensor wrap. It's a very small portion of the pipe, is that what you are referring to?

 

[RUSSELL5000]

DFitzwater: I am referring to a wrap that is used to insulate the exhaust pipe - the wrap is some type of fibrous material that you get wet and then wrap around an exhaust section. The wrap is designed to hold heat in - usually used in areas where you don't want the heat from the exhaust affecting things around it. The exhaust from the engine in my sailboat is wrapped with this stuff. You can get it at any auto parts store (where I got mine for the sailboat, anyhow). You soak it in water, wrap it tight, and then it gets real tight when it dries.

The idea, I guess, would be to wrap the exhaust pipe so that heat is retained as it makes it way back to the dpf.

Wondering if anyone has actually done so and what they have found.

Thanks!

 

[sag2]

Just around the O2 sensor, but it can't hurt. The more heat that stays inside, the more soot will burn off.

 

[RVTRKN]

I wrapped my down pipe, but not for the DPF, I wrapped my down pipe to prevent heat transferring to my G56 with trans coolers installed from Geno's.

 

[MCSloan]

I also wrapped my down pipe to prevent heat transferring to my G56 . It lowered trans temp by 15 to 20 degrees when towing. I didn't notice any change in regenerations.

 

[RUSSELL5000]

I looked at what I had left of the roll I used earlier; it is called Thermo Tec exhaust insulating wrap. A 2" wide by 100' long roll is $100. I'll crawl under the truck and estimate how much will be required. Some decrease in active regenerations will be needed to justify the cost - I just filled up on Sunday and fuel was $4.29/gallon, and so the equation gets better all the time.

A related question: on the Thermo Tec website they list the products they produce, one of which is an insulating cover for turbos. Why would you want to hold heat inside a turbo?

Thanks!

 

[gtoli]

A related question: on the Thermo Tec website they list the products they produce, one of which is an insulating cover for turbos. Why would you want to hold heat inside a turbo?

I'm guessing for the same reason as putting it on the down pipe. To keep the exhaust hot. Of course, the wrap is only for the exhaust side.

 

[seafish]

In short, it is Heat expansion that drives the turbo so the hotter the exhaust gas the more energy available to spin the turbine. A blanket keeps the heat in the turbo where it belongs, it also keeps the engine compartment a little cooler. That being said, I am not sure how the added heat might effect the egr or other emissions systems on a newer truck though one would guess that it would help with a regen of the PDF like the op suggested.

 

[RVTRKN]

I also didn't notice any less regen cycles.

 

[cerberusiam]

Wrapping the manifold, turbo, and DP are known trick to help turbo spool and scavenging in the exhaust system. It can't hurt with a smaller turbo to keep the exhausr flow as fast as possible until it gets to the DPF. The EGR is cooled so it should not effect it.