compressed air will make things cold but a turbo is on the exhaust so it gets hot and so does the air

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actully if you put your hand near the head or the outlet pipe to the tank they are hot it cools due to the rapid movement through the hose
makka

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".

I was gonna add my 2 cents worth.... but it looks like this piggy bank is already full

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[NATHAN] -- Sold everything mini related and am back in big beautiful BMWs

cooling increases density


it's easy to show...

Search for big willy's posts during the winter months and you will notice an increase in the density of his posts. although it's only slighting more dense than his usual..

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Why not swap an SR20DET in? Big job I know but nothing would catch you..

But then Nissan developed their new electric assist turbos and will likely be the death of superchargers.

The turbos are assisted by an electric motor so they are always spooled. i.e. you get the best of both worlds.

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Morphias.
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If you're not living on the edge, you're taking up too much space...

OhhhKay...

Heat soak from the exhaust through the turbocharger housing does not help things, but is not the main source of heat.
Heat buildup is mostly due to:

1. Compressing the charge air. As a gas is compressed it gives off heat (basic physics PV=nRT) Don't believe me, then put your hand on an air compressor that has been running - especially the pipe to receiver tank.
The opposite happens when you expand a gas - feel how cold the valve gets on the tank if you let all the compressed air out.

2. Friction. This is from inefficiencies in the compressor. The more that air molecules are made to rub against themselves or the compressor, the hotter they get.
Highly efficient & relatively slow rotating supercharger compressors like the Lissholm (Mercedes, etc) do not heat the air as much as a small turbocharger turbine spinning at 20,000rpm or more.

Running a low boost will allow an engine to operate without an intercooler.
It would run better with an intercooler.
An intercooler is essential with higher boost to prevent detonation & engine damage.

my 2cents

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Too many cars, and too little time.

typo

Sorry Brad, i have to disagree with your theory to explain what is obviously something you have observed first hand. I reckon the real reason that you don't notice a rise in boost in neutral is because the gas is flowing easily when there is no load. High gas velocity will result in lower pressure than the same volume of gas moving at a lower velocity.

Heat is a byproduct of the turbo compression process and also the combustion process, and in fact represents losses in the system. Remember you cannot create energy, only change the state that the energy appears in. So with an engine, you are changing the kinetic energy of the mass of gas through the engine and the chemical energy of the fuel into heat, light, and kinetic energy of the engine parts.

Ultimately the power produced by any engine is proportional to the mass flow of gas processed. More mass more power.

my $.02

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

Yep, agree with Mick 100%. I was to lazy to write a response explaining this.

Engine load has a great deal of impact on gas velocity & mass and hence boost.

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"Life is not like a box of chocolates... it's more like a jar of jalapenos. Whatever you do today, may burn your arse tomorrow."

thats what i ment but but i didnt know how to write it

when u use a rattle gun it gets cold but when the compresser is pumping air in the tank the pip going in is hot

so yeh listen to awdmoke he knows

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1152cc turbo A-series now with 125.7hp at the wheels !

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I figure it is not because the turbo is not pumping but rather because it has no load to pump against (in order to build up pressure) that you don't see any boost on the guage

Because the pressure is less inside the cylinder the exhaust pressure is less as well which means I guess that the turbo doesn't get the chance to spin up. So less inlet pressure and that inlet pressure because there is no load just pushes the piston down faster which means that engine revs rise but there is still no more boost pressure inside the cylinder.

My 2 cents of theorizing (only working inside my head so it could easily be wrong )

So if I were a ricer(with a turbo) edit: which I'm not and I don't (have a turbo that is) and didn't care about my clutch does this mean I would take my clutch to just on friction point and rev up at the lights meaning I'd have boost pressure for when I take off (ie I'd be putting load on the engine so there would be something to pump against )

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

Brad's on the mark.
You really need hot expanding gas to power the turbine.
This comes from burning fuel & air.
Small load = small volume of exhaust = low boost

You could burn your clutch to avoid boost lag, or just rev it to redline & drop the clutch like the WRX boys do (hence the big market in subie gearboxes).

Some race drivers use an anti-lag system comprising of an small fuel injector plumbed into the exhaust manifold before the turbo (the "downpipe"). By burning fuel directly before the turbo it boosts the exhaust pressure & gets the turbo spinining while the car is idling before a launch. Not good for fuel economy or emissions, but great for the strip

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Too many cars, and too little time.

Victor Bray has a Top Doorslammer... not a funny car

Maybe so but it looks `funny' to us!

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.