Heat -> Wrap / Foil ... What Works?

[Torques]

I recently bought a HKS dump-pipe.

The pipe has no heat shielding, and I am concerned that the radiated heat will have an impact on hoses and

the engine bay in general.

Any suggestions how to control this?

Is this exhaust wrap (cloth) any good?

Personally I don't like the looks of it but can not think of an alternative ..

Any suggestions?

Thanks ...

[GTSBoy]

Wrapping works well to keep the heat in the pipe and not in the bay, but it can lead to the pipe corroding and/or cracking. This depends on the material used, how well it is welded and braced/loaded etc. The corrosion can be due to the wrap gettign wet then staying wet (doesn't happen often because usually when it gets wet it's hot because you're driving.)

By far a better option is to get it coated by HPC or equivalent. If you do this on the outside, then the metal of the dump will run hotter so you can sometimes get some of the same failures that you see with wrapping, but perhaps less often. If possible, then getting coating on the inside also helps to keep the heat from actually transferring to the metal of the dump, which is doubly good. Not easy to do and not guaranteed to stay coated either, under the horrible conditions found in there.

Your other option is to use some ACL heat shield material or bend up some stainless sheet and mount heat shields in such a way that they lie between the hot dump and anything you don't want cooked. Best not to mount the shields off the dump itself. Best to mount them off other locations. The OEM heat shields are of course all attached direct to the manifold/turbo/dump and the attachment points transfer heat to the shield, but they're still better than nothing, so if you get desperate you can use a stainless hoseclamp or two to hang shields off the dump.

[Hanaldo]

I didnt find my exhaust had any affect on under bonnet temps at all. Maybe if you are sitting still, idling for a long time then it will get hot. But otherwise the air flow while you are driving keeps things pretty cool.

[black bnr32]

another option is to wrap the components you DONT want to be heated, with a reflective tape such as the DEI Cool Tape

[Torques]

Hi there,

Thanks for the replies and ideas ..

I will work something out, but even if the heat is transported away while driving there will

be heat soak when you park the car.

The car is also moved in the city and in London you are stuck alot in ridiculous traffic

(though I try to avoid this)

[limpus]

Exhaust wrap works a treat...don't worry too much about so called cracking and corrosion and what not...its not going to disintegrate in a week...the hks dump pipes are made very well and will outlast the car most likely...

[MrStabby]

I don't know if the HKS ones are stainless or not, but I was told by a performance exhaust shop not to wrap stainless as it will make it brittle, and you'll get cracks.

[r33cruiser]

I used that wrap cloth.

Soak it in water then wrapped the dump pipe.

It's worked, the dump pipe has no signs of corrosion.

Happy days

[The Bogan]

Wrap it, if it cracks in a coulpe of years get a new one and wrap that, also efective tape/shielding on local parts works for me.

Wet it first and wear gloves and long sleeves, that s hit is itchy.

[Nee-san]

f**k wrapping it, get it ceramic coated, send it away pay money, done its a massive pain in the ass heat cloth really.

[Torques]

Hi!

Yes, the HKS is stainless steel .. I wanted to have something which outlasts the car

It's a nice piece of hardware but the location of the lambda-sensor is awkward ..

I will try the wrap (since it seems to be easy to apply and is also not expensive)

Many thanks ....

[Don Dada]

Snice we're on the topic.....

I have a aftermarket matched length dump pipe for the twins that pass very close to the gearbox and I was thinking about wrapping it to avoid heating up the box.

What i want to know is should I wrap just this one pipe alone, or should I wrap the both to keep the temp similar in both and therfore velocity? and all that simmidimmi ?

[Nee-san]

Snice we're on the topic.....

I have a aftermarket matched length dump pipe for the twins that pass very close to the gearbox and I was thinking about wrapping it to avoid heating up the box.

What i want to know is should I wrap just this one pipe alone, or should I wrap the both to keep the temp similar in both and therfore velocity? and all that simmidimmi ?

wrap both, put a shield on the gearbox itself.

[SargeRX8]

Ceramic coating is awesome and cost roughly the same as good quality heat wrap. The shop near me does ceramic coating for dump pipes for $100.

Skylines do run quite cool compared to some other cars. My uncles R8(modded a little) runs quite warm you can feel it.

My brothers car had a tissue touching the dump.... It caught fire.... Its a rotor. It was quite funny, we were like what the f**k is all this smoke. Then you see a tissue smouldering. To note, the car was not driven, just idling in the drive way for about 3 minutes.

My input is it does make a difference. Ive sat passenger in my both my skylines a couple times. My old skyline was heat wrapped the whole way to the muffler(overkill?). This one is only wrapped on the cat back. I can tell you there is a definite difference in passenger footwell temps esp on longer drives.

[GTSBoy]

I can smell the stuff on the firewall getting hot in my car (R32) with my unwrapped dump when I'm really up it and I'm strongly considering getting it coated while it's off when I do the engine swap.

[Simon-S14]

In my car which gets well thrashed my unwrapped dump gets so hot that my passenger melted his shoe on the floor plan when we were at winton. Lol! Need to rewrap it