I have a nice shiny (thank you Silverscoobysport ) down pipe to fit on my classic MY99

Quick question. Is there any benefits in wrapping the top part of the down pipe
at all ?

The reason for asking is because I know said it gives you some benefits and maybe some nice noises

 

Hi there

Its worth to wrap downpipe just due better underbonnet temps,this is main advantage of the wrapping

With yours Nur Spec will unleash little bit more noise,neighbours will love you


Jura

 

Ha I like the idea of that extra noise with the Nur Spec

Have some wrap in the garage just need to find the SS ties now

 

Not really worth it imo ....


But then lots of things we do to our cars make no noticeable difference at all ..


I did it because I had enough left over from wrapping manifold.

 

that is what I thought, saw a roll in the garage and thought why not

 

as the downpipe isn't under the bonnet, i can't see how it helps keep under bonnet temps down, it may stop the paint on the bulkhead getting hot, that's about all, and possibly increase the rest of the system's temp

 

Downpipe not under the bonnet ? where you looking bud LOL !

And when i wrapped mine i had to use wire to secure it on as i didnt realise the S/S ties needed a special gun to secure them on, which is like £40 !!!!

 

That must be why the cable ties on mine are loose! I had no idea about this tool either!

 

the only part thats under the bonnet area is the turbo exhaust housing and about 6 inchs of pipe, the rest is under whats known as the bulkhead, now as air is going to rush under the bulkhead from the front of the car, i fail to see how it can make any difference at all, unless of course you are going backwards at some speed, as for the headers and up pipe thats another story, they do make a big difference,

 

Heat rises as they say, it still makes for massive heat soak in the engine bay, yes when your moving all the engine is getting cool some way or another, but its those slow poodles around 20-40 mph it helps with under bonnet temps, i like to think anyway :-)

 

i thought it was the same reason you wrapped headers and up pipes? to keep the heat in the pipes to keep the velocity of the gases moving quickly?

 

How much in length would you need to wrap down pipe and headers

 

Hot exhaust gases also flow faster.

 

Can rot the downpipe.especially if its not a daily drive.

 

Wrapping the exhaust manifold and up pipe is a no-brainer. But if you have a FMIC, and you retain the OEM bonnet scoop then even at modest speeds there is a considerable volume of cool air that conducts hot air from the downpipe away under the car. Wrapping the downpipe can't do any harm but whether it does any measurable good is debatable, so unless someone has done temp comparisons it's just speculation.

 

I personally would wrap the down pipe! I ran a unwrapped downpipe for a day last summer, heat coming through the bulkhead after a spirited drive was unbearable.. It was removed, wrapped and refitted straight away!

 

I've had exhaust manifolds ceramic coated. There are several places doing this, I used these:

http://www.zircotec.com

very good product but not cheap.

 

I would have thought past the Turbo air needs to start cooling as it shrinks. More out! Get a blanket on the Turbo and some ducting on the downpipe!

That said a cat is more efficient red hot. Gawd.

 

Thanks for all the replies

As it was raining and I had a few SS ties, I soaked the wrap and spent 30 mins in the garage on my own








Next job is the bloody fitting

 

Did you have to use the s/s tool or is there another way to use the s/s ties ?

 

Pair of pliars and a screwdriver and lots of swearing

 

I've found that doubling the wrap thickness where the ties are positioned allows the ties to pull up really firmly. Needs extra wrap but it doesn't work loose or need wire.

 

I was always told that over lapping is better and to over overlap is better than under over lapping ( sounds all wrong that last sentence )

But good tip on the ties there

Like someone said there is a special tool for the S/S ties BTBH there was no way I was going to spend £40

And soaking them for a few hours certainly helps. Another tip is to , once wrapped, spray the wrap in a high temp coating . I have a few cans of clear high temp so will give it a quick going over to seal it

 

You can do the ties with pliers and screwdriver as above, we have a Band-it tool in work but you can get them just as good without it. The downpipe sits under the brake fluid reservoir too so I've always wrapped mine.

 

I used jubilee clips top and bottom you can get them very tight so no chance of it falling off