Meallbhan

iTrader: (3)

Been thinking of getting a sports cat downpipe and was wondering if I needed to cover it in heatwrap. Is this something I need to do and what would the benefits be?

Cheers.

jbl

I have the Ninja d/p on my Forester and I heat wrapped it prior to the install, just to keep the heat away from the engine bay a little and keep the cat' warm so it worked well. I think that it also keeps some of the noise out of the cabin as well. It can't do any harm, only good.

Cheers

JBL

James Neill

iTrader: (1)

Yes, you should heat wrap it. Two reasons

1) Keeps the heat in and therefore the exhaust gases flow faster
2) keeps the heat in and therefore the cat works better (needs to be hot to work). Will make passing the MOT more certain as it'll be quicker to get the cat up to operating temp if the car has been sat around beforehand

Meallbhan

iTrader: (3)

Thanks for the answers, so how do you go about wrapping the pipe? What length and width of tape should I get and how far up and down the pipe should I go etc etc?

Midlife......

iTrader: (2)

PM Harvey on here........... bit of a Guru on the heatwrap front....and a lot more too

Shaun

harvey

iTrader: (48)

Thanks for the PM.
You should use 2" x50 foot roll but before you wrap the CAT, check with the manufacturer if there will be a problem from running the CAT a bit hotter, typically 100 C more than when it is unwrapped.
Up-pipes, downpipes and headers all benefit from wrapping. Anything you want to keep the heat in (or out of)
Only use good quality wrap. Although far from the cheapest the DEI wrap is best for me as it performs better than anything else I have tried so far and as it has a stitch down either side, it is economical and easy to use because you can follow the recommended overlap.
Avoid double wrapping as it is wasteful and just not necessary. It would also allow local hotspots to develop.
Aply damp NOT soaking wet.
I use tie wire as straps are just too expensive. I also have tie wire pliers which make wire tie easy and the more ties the better the job and the cost of wire is such that there is no cost implication with lods of ties.
Keep the wrap tigh while applying.
As a very rough guide to how much you need :
The diameter to be wrapped in mm X 3.5 X length to be wrapped, divided by 40, divide by 1,000 and you have the approx length in meters.
I can send you a roll of 2" x 50' overnight, inclusive of Paypal for £50 if you want it.
Anymore questions, drop me an e-mail harveysmith1@btopenworld.com

Meallbhan

iTrader: (3)

Harvey, thanks very much for your reply it was really helpful. I emailed scoobyworld about wrapping the pipe and they replied with a few pointers and most importantly said that it would not effect the warranty . I will hang on to your email address and get in touch if need be when the time comes. Thanks again.

Harryr34

iTrader: (9)

Hi, Sorry to hijack your post I have a question for Harvey and anyone else that knows a thing or two about heatwrap.

I have just finished wrapping my manifold, up pipe and downpipe using DEI Heatwrap, what are the pros and cons of spraying the heatwrap using the recommended DEI spray?

Do you recommend that the heatwrap be sprayed to keep it in good condition?

Thanks
Harry

harvey

iTrader: (48)

Personally I think the spray is a con. Just a useless add on.
In my experience it makes the wrap go brittle and it flakes off prematurely.
If the wrap is applied damp, kept tight, well supported with tie wire and dried out gently before fitting then it lasts a long time.
I think I read on the side of one of the tins that the paint spray was designed to keep out moisture. I don't know who dreamed up that crap but my experience in arduous service is that it shortens the wrap life.

jdmforest

does having heatwrap on a complete de cat matter as opposed to a sports cat?

harvey

iTrader: (48)

Read what James Neill posted above.
Improved gas flow and reduced underbonnet heat, regardless of make, colour or year.