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Old 06-18-2012, 08:50 PM   #1
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Exhaust Wrap

So, I've been analyzing the intake/exhaust setup to look for more of the horsepowers. While I do have a some concepts already, I began to wonder about wrap. Heated exhaust flows at a higher velocity and produces a greater scavenging effect and would theoretically open up a fractional amount of power.

Understand that I am not looking for a massive increase. Simply some discussion on the theory by people who may have a bit more experience with it. I figure that when I do my exhaust, it would be relatively easy to wrap near pre-final install. Most of my route to work is smooth flowing, though I may cook a bit on the way home.

Pro's - A couple of ponies? Something cool to make your friend lay on the ground to look at?

Con's - High cost, minimal gain, frustrating to work with, high cabin temps

Discuss.

Edit: Assume a cost of $200 for a 6"x100' roll.


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Old 06-18-2012, 08:58 PM   #2
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It's not worth it unless you are trying to keep heat off fragile underhood components that run close to your exhaust. I have seen wraps help in turbo applications (help turbo spool faster and keep underhood temps down). In an N/A application they have very minimal advantages except for what I mentioned in sentence #1.

IMHO, they are an antiquated crutch method compared to more modern coatings which are much much superior.

Wraps also greatly reduce the life of your exhaust components (stainless or not).

So, in my opinion, stay away from them. Stick with coatings.
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Old 06-18-2012, 09:02 PM   #3
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I forgot about the reduced component life, good call.

So, switching to coatings then, is there still pretty much minimal hp advantage in a NA car?
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Old 06-18-2012, 09:03 PM   #4
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I'd pass on the wrap. There are better places to put your cashola.
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Old 06-18-2012, 09:05 PM   #5
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Quote:
Originally Posted by felixthecat View Post
I'd pass on the wrap. There are better places to put your cashola.
Segue for a second - I don't understand the difference between the gold stars and the grey stars above the avatar. I've searched for the info to no avail...
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Old 06-18-2012, 09:05 PM   #6
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Keeping the heat in the pipe does promote better exhaust velocity, however that usually only applies to high velocity exhaust components like headers and turbo down pipes. I do not see any advantage of wrapping the actual exhaust piping on these cars.
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Old 06-18-2012, 09:09 PM   #7
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Quote:
Originally Posted by Power Surge View Post
Keeping the heat in the pipe does promote better exhaust velocity, however that usually only applies to high velocity exhaust components like headers and turbo down pipes. I do not see any advantage of wrapping the actual exhaust piping on these cars.
This is probably true, and I would imagine more true with a 2.5" exhaust...

My thought process is that if you can use the temp to speed up the larger open area that the high velocity components (actually the whole system) would flow smoother.

Probably just over-analyzed on my part.
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Old 06-18-2012, 09:13 PM   #8
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Quote:
Originally Posted by felixthecat View Post
I'd pass on the wrap. There are better places to put your cashola.
I'm sure this is correct. Just spit-balling some ideas that were floating in my head...
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Old 06-18-2012, 09:13 PM   #9
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I just recently wrapped my headers. I did not do it for HP gains or better but just so I could eliminate the heat shield and I think it looks cool.
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Old 06-18-2012, 09:16 PM   #10
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Quote:
Originally Posted by Nashville SVT View Post
I just recently wrapped my headers. I did not do it for HP gains or better but just so I could eliminate the heat shield and I think it looks cool.
How do you feel that this has affected your underhood temps?
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