how many people have done this? i noticed much more noise after putting in the dp and read that this would really quiet down the exhaust. is this true?? my dp is slightly touching the heat shield underneath which is also vibrating and ill get that fixed when its back on the road next summer but, will it tone down the noise???

 

It wont help noise a darn bit. Will keep engine bay temps down though, go for it.

 

Wrap it man !



You can use hose clamps to hold the heat wrap on...cheaper than the straps they try to sell you.

James

 

wrap it, why not?

 

If you're not wrapping any welds, then it's not a problem.
If you have welds you're going to cover, the wrapping tends to cause the welds to fail / erode faster.


-Ted

 

^^ Really? I did not know that...

Is there any way to protect the welds and keep them from failing?

 

thanks for the tip Ted, I'll have to go take a look at the wrap the last owner did

 

Protect the welds by NOT wrapping them.
Or, get the pipe internally ceramic coated.
http://www.swaintech.com/header.html#price
http://www.jet-hot.com/Pages/coatings.html
http://www.hpcoatings.com/hipercoat_extreme.htm
http://www.thermaltechcoatings.com/prod01.htm

I wonder if that "Harley" anti-bluing internal pipe coatings could also be used to keep the welds cooler.
http://www.denniskirk.com/jsp/produc...d=22205&mmyId=

 

where do you guys buy your wrap from? i didnt know either that the wrap would effect welds? learn somthin new every day.

 

Have you personally done this??? I wrapped my dp and my car is quieter at idle.

 

Not to thread jack but...I was curious about the advantages of ceramic coating you dp inside and out. Is that common? I know my mechanic suggested getting my dp jet hot coated, but I don't remember him specifying to have it coated inside and out. Thanks.

 

DEI products

any sucka with a Keystone catalouge can get you rolls of it...im one of those suckas...hehe

there may be other companies that make it, DEI is just the one Ive always used.

edit: and yes it affects the welds due to (I believe) the forced heat retention of the steel...since the metal is being heated on one side and not fully escaping on the other it accelerates the breakdown of the welds because they are hotter than they should be and having the regular stresses of boosting and revving being exurted on them in that overheated state they tend to strecth and eventually crack...prematurely. Why is it that so many hot things finish prematurely? hehehe

 

Summit Racing or the speed machine performance website. i think summit is cheaper.

 

Coatings are common.
The problem with wrapping or coating just the outside of an exhaust component could shorten the life of the piece. It is insulated and can't dissipate heat.
Coating the inside prevents the pipe from getting too hot to begin with.

 

the advantages are numerous.

Since the ceramic on the inside of the pipe prevents the heat from soaking into the steel, more of it gets blown out the end of the pipe. The coating on the outside of the pipe just adds extra protection for any heat that is soaking out of the exhaust and into the engine bay or associated components like your turbo.

For example - the skyline has a ceramic turbo......why?.....less heat soak

 

Exactly what he said. I do ceramic,thermal and powder coating for a living. I own CE COATINGS

Don't wrap it. Ya it will last awhile but eventually any water,moisture etc that gets the wrap wet will help the pipe rust faster. Ive seen headers for v8's rust thru the thin wall material headers are made out of.

as for ceramic inside and out. Its a waste of time and $$ to just do one or the other. You do just the outside for looks condensation builds up inside and you can rust from the inside out.(I've seen it also) just do the inside and its just the same.

coating a dp for $18-22 per foot of pipe to lower temps is well worth it in my book.

 

22 bucks a foot isnt that bad!! how long would this last?

 

Down pipe. it will/should outlast the car.

I give a 3year warrenty on used parts. If it was NEW a lifetime.

Ive had a guy crush a Y pipe on a curb and not scuff off all the ceramic.

 

Skylines do not have ceramic turbos, they have turbos that use a ceramic turbine wheel, just like a lot of other Nissan/Garrett turbos. This is purely to reduce rotational inertia, and has nothing to do with heat.