hi, ive got a mongoose system fitted to my car, and the downpipe (from the turbo back) has no heatshield like the original exhaust. question is, do i put that bandage wrap stuff around it to lower underbonnet temps as the intercooler is just above it? or would this cause the turbo to maintain higher temperatures in itself, i.e. more stress on turbo.

any thoughts?

thanks, ian.

 

Do it ...
I was advised to wrap the exhaust but was scepticle ... as the pipe was off and the wrap was free I did it anyway.
You will notice the difference, there is a technical explaination to do with thermal dynamics or some **** ... all I know is the boost hits earlier and harder, engine bay temps are down and the smile is bigger

 

excellent, thanks for that mate. i was going to do it a few weeks back, but then read something about someone removing some previously fitted wrap to find the exhaust in a right mess. but i suspect it was maybe mild steel and the wrap held water and rotted it etc....who knows!
anyway, mine's stainless and i can have the downpipe off in 15mins, so will do it this week!

thanks again,

ian

 

Downpipe off in 15 minutes! heaven. Anyway, where do you get the wrap from?

stuart

 

hi johnny, dp removal comes from practice, first clutch went: gearbox out.......then gearbox went: out again!!
as for the wrap, ill get mine from Demon Tweeks in wrexham next week, as im gonna get a boost gauge aswell (finally!).
any good tuning accessory shop should have some.

if you get stuck, i can get you some and post it to you. although ill have to figure out how much i need first.

thanks

ian

 

I have 10m x2"woven exhaust wrap + the tie on wire £30 inc post. Only for sale as the D/P is being ceramic coated instead.

 

Hi Ian,

I've been thinkin' about gettin' the DP wrapped too. I had a look thru' the Demon Tweeks Motorsport catalogue and found that they do a high temperature thermal barrier paint for about £25. Cheaper than the wrap and probably easier to put on. Don't know if it will be as effective but it shouldnt let water get under it. Im thinkin' of doin the exhaust manifold too so i can get rid of the heatshields at the front that keep cracking and then rattling.

Just a thought,

Tony.

 

Believe that the exhaust wrap keeps the heat in (obviously). Hot gases flow faster than cold gases due to their reduced density.

 

hi tony, have seen that paint, but due to the thickness, not sure about the effects being the same, but you never know. i think ill use the wrap though, as my pipe is stainless steel, so wont rot.
as for the flamin manifold, i have a cracked heatsheild which tingles away on idle, so think ill wrap that aswell, and while its off, ill port the manifolds.

cheers

ian

 

RT, you just squeezed that message in before i posted mine......
yes, youre right, the wrap keeps the heat in, and yes hotter air is less dense, and so flows quicker. unsure what effect this will have on turbo temps though if the manifold is wrapped. anyone any ideas?

ian

 

Just a word of caution for those who've never done exhaust wrapping. It smokes and smells for the first day or so after installation, so don't be alarmed!

 

Does anyone have any dyno evidence that wrapping works?

stuart

 

ceramic coating does.........

especially if you have it done to a new d/p (so it can be done inside and out)

my under bonnet temps were down to approx 5 degrees above ambient (moderate driving).

m

 

Anyone know who retails ceramic coated pipes?

Or can you take any pipe & get it coated?
If so who does this please?

Chris

 

Course the wrapping works...

Anything that reduces heat in the engine bay and increases the life of the turbo (directly over the downpipe) has got to be good -why dya think a heat shield is fitted as standard??? duuuuuuuhhhhhhhhh

Anything that reduces temps on the top mount is very good and I would put money on it increases the RR figures!!

Of course WI is much better but the basics are always good -

 

Ceramic coating has the same effect - keeps the heat down - ala BPM - problem is the d/pipe rusts quick and destroys the benefit.. after a while....

Bladrunner needs all the help he can get after last months results - or was it that diesel engine with the odd turbo (erm.. I mean pipe) missing....

 

Chris: Try Camcoat Warrington. Approx. £100 inc vat on new D/P inside & out plus dly. Does it work? Ask me in 2 or 3 wks.

 

With an uppipe, I read you will minus the EGT by 100-120° C, because you remove the hot spot of the cat.

So, what about wraping the uppipe, before the turbo ?

I will certainly help the engine bay to be not too warm but, will it raise the turbo internal temperature ?

A friend of mine did the mod :



Any feedback in England ?

 

Steve, your very patronising, but not very scientific. Show me the evidence! subjective ramblings I can do without.

stuart

 

Steve, I agree with JC re tone of reply.

IMHO the original downpipe is encased for two reasons
1 - To protect the surrounding brake, clutch and cables etc from direct radient heat.
2 - To retain the heat within the Cat to minimise warm up time.

I am quite sure that exhaust gas velocity was not a primary reason.

I would also question your logic on why a lagged downpipe would increase turbo reliability ? The turbo is hotter than the downpipe therefore the heat flows away from the turbo via the downpipe. If you lag the downpipe, it becomes less efficient at heat dispersal and therefore the turbo runs hotter not cooler.

I do agree that a lagged downpipe will increase turbo thermal operational efficiency and it will also lower charge temps whilst at lower mph.

cc

[Edited by Cosie Convert - 2/26/2002 8:13:08 PM]

 

This may seem like a stupid question but if you put the stuff around the back box would it make it significantly quieter?

Anyone?

F

 

After running my DP unwrapped for about a year I decided to wrap it to hopefully get the rest of the exhaust hotter in the pursuit of flames. Sad I know but its my car so sod off Anyway the car is now quieter inside due to the lagging and also the pops are louder. Still not sure if I'm getting flames but I'm working on that one.

Oh and am I the only one who wrapped their DP whilst it was on the car....

DaveW

 

 

Thats the way to do it.

 

hmmm, i see a wrapped manifold, im gonna wrap mine, and the downpipe and itll eliminate that annoying cracked heatshield.
you notice any differences wrapping the manifold?
im gonna port mine at the same time...

ian

 

Dave, was there any noticeable, real world performance difference when you wrapped it?

stuart

 

Steve .....

230 bhp wasn't bad........considering it was in default mode
(air /fuel mixture pipe had come off)

;-)

m.

 

I haven't noticed any performance difference but if it keeps the under bonnet temps down in the summer then it will be worth it. Even in this weather it seems cooler but then I haven't checked temps. One thing I have noticed is that the gearbox is taking longer to heat up, so the temps down there have definately come down.

DaveW