What do i use? do i use the exhaust repair material as i only want to do the top of the pipe and will this affect the EGT as its lagged??

Tony

 

egt wont increase.. may make the exhaust warmer further down though... you dont use repair bandage...

I would like to know the cheapest places as it seems to be about £100... also anybody know where to get the turbo wraps from cheap?

David

 

Go to demon tweeks website they do proper wrapping bags + the normal wrapround material you need.

 

Tony,

Speak to Spen555 he lagged his while it was still on the car

Cheers

Guy

 

Sounds like someones hoping to get that extra 2bhp! - even I havent lagged mine - the stuff stinks for ages

 

Cheers Guy

Steve, its not that its cos its starting to affect my clutch resovoir so rather than rip my heatshield to bits im going to lag me pipe instead, just ordered my lagging material so hopefully will be here in a few days (saturday will be nice so i can try to fit it!)

Tony

 

Fair Dinkum

 

do your manifolds while your at it


my downpipe is coming soon and i've still got enough left


kev

 

Tony,

Guy's right. I lagged mine while it was still on the car. Usual thing, seems straight forward enough but ended up being a complete pain in the ar$e to get it done.

I took the heatshield off and started the wrapping from the top. I think I jacked the car up just enough so I could slide under. I then had somebody pass the wrap down one side of the downpipe and I passed it back up the other side. It was awkward as it kept slipping about. I tied it at either end with some wire.

Later that night I could feel all my face burning as I had been lying directly beneath the wrap and I was in such a tight space I could not avoid the wrap dropping onto my face when it was passed down. LOL!!!

I can understand wrapping the downpipe as from what I have read this retains more heat in the downpipe and so allows exhaust gases to exit faster. Is this the same reason for doing the manifold? If so what are it's effects?

Damian.

 

don't know yet will be putting them back on very soon, hoping to get the turbo spooling up quicker etc.


kev

 

What utter twaddle!

Surely the reason for lagging the headers and the downpipe is primarily to keep heat in the engine bay down!! so that you dont get the usual power sapping heat so soon........ and the other 0.01% is to protect certain things like the clutch reservior and the turbo, etc

As I now have an FMIC I wont be lagging my downpipe at all, as I'd be wasting monies

 

Lagging the headers is an accepted way of preserving the exhaust gas temperature to assist the turbine.

 

Pah, maybe in a mini where the manifold is below the i/l to keep temps down, but keep the heat in - show me the evidence?

F (sceptical mode)

 

John

That maybe so - but thats not why people lag the exhaust and other bits in reality

Well know-one I ever knew that did it...

(You had to lag the RS Turbo as the exhaust went directly next to the starter motor and it fried it.... but many kev boy racers thought it was too much money to do this and preferred to jump start their cars....)

 

i'm sticking with what i've said i use this stuff design engineering inc.


kev

 

also you'll notice the wrc car's exhaust system is white, that'll be ceramic coating (rich man's exhaust wrap )


kev

 

the cheapest place I have found for lagging is merlin motorsport

http://www.merlinmotorsport.co.uk

 

If Corky Bell says it and it makes sense it is good enough for me.

"Performance of the turbine is in part determined by the temperature of the exhaust gases. It is reasonable to expend some effort toward getting the exhaust gas from the combustion chamber to the turbine with the least possible temperature loss." "....the objective is to keep heat inside the manifold...."

[Edited by john banks - 6/20/2002 11:22:37 PM]

 

kev

 

OK most people lag their downpipes to reduce under bonnet temperatures but lagging the exhaust also increase the thermal retention within the exhaust pipes and subsequently expediates exhaust gas flow at a higher velocity, which increases horsepower. Albeit by a negligible amount, you would really need replacement headers (also wrapped) and the turbo thermally wrapped to see any gains.

£100 for exhaust wrap you only need enough to do the downpipe not the whole system

 

Except replacement headers as well, or I think the lower plasticy thingy under the engine might start to sag a little. And the oil feed lines above the header melt, or at least add quite a bit of unwanted heat to the oil
I think lagging's worth it 'cos it helps keep the things that should be hot, hot, and the things that should be cold, cold (or cooler, anyway . Who knows - maybe if more pipes were lagged there'd be less engine popping going on.

 

Agree - almost totally negligible gain!

Just think what else you could do with £100...... - ermmm not much really

Me - I never spend money on mi carrrr...

 

i'm not expecting a massive gain, some performance would be a bonus but if you saw the state of my heatshields you'll know the main reason why i've lagged all my pipes

although less heat in the engine bay will lower intake temps, intercooler temps etc. and it all adds up


kev

 

lagging cost me 30 quid (trade) so not spent that much


kev

 

Surely the best reason for lagging is to get rid of those rattling ******* heatshields!!!!!!!!!

 

I love those negligible gains me

Headers wrapped, uppipe wrapped, downpipe wrapped, turbo blanket, turbo inlet radiused, downpipe internals radiused, intercooler pipework ported and radiused, inlet manifold ceramic spacers, throttle body radiused, turbo exhaust matched to uppipe, cold air duct to air filter etc etc....

All negligible until added together........ RESULT !!

 

Andy - didn't I see wrapped fuel pipes too?

Richard

 

'every little helps'


kev

 

Cosie Convert

Read Mo's thread - I'd expect you to get a significant gain from wrapping everything

Negligible was in reference to exhaust gas exit!

 

John Banks,

I am suprised that you neglected to quote Corky Bell thus:
"Reducing the amount of ambient air flowing around the exhaust manifold and turbocharger will further reduce heat loss from the system. It is generally not feasible to directly wrap the exhaust manifold with an insulating material as the manifold itself will overheat to the point of structural failure" (Chapter 10 Page 119 Psalm "Thermal Characteristics" ).

Mind you, didn't stop me wrapping my headers, but I expect the free flow of ambient air around them should help cool them sufficiently not to be too worried by the structural failure bit.


Steve Mc.,

You really do have a way with words!


Moray
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