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Old 05-08-2000, 09:34 PM   #1
Eric Gagnon
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Member#: 46
Join Date: Jun 1999
Location: Saratoga Springs, NY
Vehicle:
2001 Jetta 1.8T
White

Question Header Wrapping

Has anyone with Borla headers wrapped then in that heat wrap material. I was thinkning about getting some and trying ti this weekend but wan't sure if it was worth doing or if anyone has tried it..

Eric
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Old 05-09-2000, 07:16 AM   #2
ravent
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Location: fremont,ca,usa
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00/+ RS/OBS
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Cool

It is a good idea to keep the heat in the pipes and in the Borla, away from the oil filter...I want to have mine Hyper Coated (they say "up to 60% reduction in heat)inside and out...did your borla have poorly mounted flanges and vice marks all over from the bending process, like mine...none of which hurts the great sound or performance increase.
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Old 05-09-2000, 07:33 AM   #3
Opie
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Location: Riverview, Florida - U.S.A.
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2015 Forester 2.0XT
'14 XV Crosstrek Ltd

Post

Don't use the "wrap" on your headers, the wrap retains moisture (as well as heat) and will cause the header to corrode and fail. I had headers on my last vehicle with a lifetime warranty, I used the wrap on them and the headers split. They would not warranty them because of the wrap. I bet if you call Borla (or whomever you got the headers from) they will recomend against using the wrap.
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Old 05-09-2000, 09:59 AM   #4
boxerman
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Opie,
I have heard the same thing but only with various mild steels. I don't know if they will have a problem with stainless, I guess it depends on the grade.

Was your experience with stainless or mild steels. Performance wise there is an advantage to keeping heat in the exhaust as it will increase velocity and scavenging.

Tim
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Old 05-09-2000, 11:31 AM   #5
Opie
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'14 XV Crosstrek Ltd

Post

Mine were a mild steel header that already came with a factory "heat coating" (similar to a jet-hot type coating). The header split right at the 2nd-Y (they were a tri-Y style header). Probably due to a combination of moisture corrosion and excessive heat (because of the coating & the wrap).
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Old 05-09-2000, 11:31 AM   #6
Catfish
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2000 2.5RS Sedan
72 Datsun 240Z

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The amount of rust does depend on the type of material the header is made of, however, all header wraps retain moisture so everything will rust eventually. If it is just painted mild steel, then it will rust out pretty quick. Chromed headers will take longer. Cheaper headers are also made of thinner walled tubing, so the problem is just that much worse. Take a look at a Monza header for any type of car and then compare it to a custom or high-end header; There's a dramatic difference.

There are other factors that influence the rusting issue also. Things such as when you drive the car, where you drive the car, header placement in the car, etc....If you drive your car in the winter time, you can surely expect it to rust. Winter usally = rain or snow, and we all know that water is a catalyst for rust. Also, on the Subaru, the header is beneath the engine due to the H-4 design. This means the header is directly exposed to the ground and any water on the road. Other cars, such as Chevy V8's or my Datsun for example have the headers mounted higher up, inside the engine compartment, so there's less risk of water retention in those areas.

That said, I wouldn't install header wrap on any Subaru. The header is exposed underneath the car which is not ideal for rust prevention. I'd recommend getting a good ceramic coating, like Jet-Hot or something. It costs a little more than the header wrap, and doesn't retain heat quite as well, but is much more durable, and will boost performance while adding protection. When I buy a header for my Sube, a ceramic coating is definitely in the plans. I use the header wrap on my Datsun, but I only drive it during the Spring/Summer months, and then only when it's sunny outside. The rest of the time it just sits in the garage. I'm sure the wrap will begin to rust the header eventually, but I'm willing to live with it since I rarely drive the car. Just sitting in the garage the wrap retains moisture too, so there's really no way to win with header wraps.
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Old 05-09-2000, 02:57 PM   #7
Jay_UK
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Cool

Hi guys...

Some wrap is not suitable for mild steel pipes... it attacks them.

Wrap is fine on stainless though.

I have had my headers HPC'ed and it does make a difference. The main problem with the scoob is heat soak upwards, and the proximity to the oil filter.

My headers are now lagged too. Basically I have the best of both worlds - and it works. I keep the temps down.

A turbo heat shield/insulation kit is next. I have run a turbo blanket, but didnt think it was that good.

I am currently looking at a twin plate heat shield, made out of two thin sheets... both coated in thermal reflective and thermal insulating coating. Seperated by an air gap.

Any comments ? good idea ? crap ?

J.

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Old 05-09-2000, 06:07 PM   #8
Eric Gagnon
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Yeah the headers did look like crap and had to be modified to fit properly. But i just took a torch to them and bent them alittle while i have it up on the lift. Well and ground off a little peice of the frame (it was extra material anywyas ).

I was going to get then coated but i wanted to make sure they fit peroperly before i spent the money on it.. Next weekend i am going to install a bung in the header for a EGT gauge. SO i guess the wrap isn't a good idea. Maybe i will just run em and see how things go.


Jay - What is "lagged" mean. this is a new term to me.

Thanks for your input everyone..

Eric
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