dumb question perhaps but....



1. What is the porpose of those purple inlets on the turbo?



2. What is the porpose of the cylindrical crome covers on the exast housings?

pic?

From what he said, I will take a guess.





The purple thing sounds like an air horn. It basically straightens out the air going into the compressor. Supposedly makes it flow better.





The chrome cover over the turbine housing sounds like a heatshield.

god damn it!! I did it gain, I really need to sleep more, sorry guys, here is the pic:



http://www.sp-power.com/images/media..._supra7_07.jpg

IF those are heatshields wouldnt they prevent the housing from cooling beetter and thus make the turbo run even hotter?

You want the turbo to retain as much heat as possible. Heat = Energy. So wrapping it with insulation will make it more efficent.

that makes no sence. Turbos are spooled by the pressure of the exast gases, not their temperature, you can blow whatever you want through the exast housing to spool the turbo hot or cold. The only way I can see how heat helps is when thingsare hot they expand, so with hot gasses you would need less actuall gas (then cold gases) because the voluem will be bigger. But that means the temp of the gasses ENTERING the turbo play a key role, when inside heating them up seem rather pointless because by the time they will they will be out of the turbo already. I dont know, just trying to reason it out....

The exhaust gas is already hot, you aren't heating it more by insulating the turbo. You are keeping the energy inside of the turbine housing instead of letting it just go wherever it wants. I can't really explain it any better.





Someone else will have some ideas.

Gasses (exhaust included) contract as they cool. By letting the exhaust gas cool, it loses energy that could have been used by the turbo.

You are thinking WAY too hard.

that shape is called a centrifuge or something, it is shaped like that because it accelorates the air into the turbo. You see the same look on webber carborators for that same reason. Air sticks to curved surfaces and is acceltorated into the turbo.

i see... the gasses go through the turbo so fast though do they really have time to cool?

?? that was random.... i didnt say anything about the shape of the exaust housing ^^

he didn't say anything about the exhaust housing... https://www.nopistons.com/forums/pub...1047683561.gif

you would be surprised how much of a difference. Here's an example. My EGT used to sit right at the junction of the "Y" where the front and rear exhaust ports connect on the manifold. I moved it appx 4 inches up on my manifold. My EGTs went down(lost about 100 C!) When I heat wrapped my downpipe, it went up 200 Celsius.



In the case of the picture at hand, I seriously doubt that the "shield" has any effect on keeping the EGTs up.

Do research on the subject



before you start telling people who answer your questions they are wrong and/or make no sense.



some books on thermodynamics/physics might do you some good too.

no need to be an *******, I was just trying to reason this out, I dont think ANYONE is wrong, I mearly say what seems to make sence to me.



thanks for the numbers jspecracer. Form this I understand that wraping the down pipe is a must, shiled the engine bay from bad heat and use it to help the turbo, right

I barely saw any difference in the spool up of my turbo...but it's so big I guess it wouldn't matter anyways. Mainly I did it so I wouldn't burn my hands on the downpipe when taking it off when the engine was still hot. I know I talked to Dragon about it when he had his turbo ZC CRX with heat wrapped exhaust manifold and downpipe. Said the spool up was MUCH better, but his EGTs went out the roof. I only wrapped the downpipe, not my manifold because the manifold I have now is stainless steel...so it has a good chance of warping, which would increase if there was more heat(due to the heat wrapping).

Pengaru is right, take some thermodynamics courses before you argue this subject.



Those heat shields aren't going to help the turbo much, I think, they are mostly meant to protect other components from heat radiating from the housing.

The purple airhorn is sorta like velocity stacks found on Weber carbs

would putting a filter on the airhorn render it useless? what if put between the airhorn and the turbo?

yeah that makes it usless. if you dont have the horn you have a filteror vice versa

Pengaru is right, take some thermodynamics courses before you argue this subject.



Those heat shields aren't going to help the turbo much, I think, they are mostly meant to protect other components from heat radiating from the housing. [/quote]

I know that in Japan, the exhaust housing has to have a heat shield around it(to be considered "legal")...it's possible that this kit came from Japan and then thrown on a LHD Supra.

K&N makes a velocity stack/filter combo

how well does it preform?

No clue. I've only seen a picture of it.

epion go away

Freestyle, Shut the **** up. If you have a problem with Epion...use the PM system instead of post whoring the Single Turbo Section....He's asking legitimate questions. Sometimes, he just gets on the wrong track...like so many of us have before.

If he was just asking questions that would be fine, but on a couple of occasions people gave very good info and he tried to argue with them. I say if you are not looking for the correct answer and just want to argue when you don't know ****, then go the **** away.

Amen to that

I do not try to argue, just sometimes state that somethings do not seem to add up, from my point of view anyway, which means I am asking for clarification and more indepth answers because I am trying to understand something because I want to learn. but if so many of you want me to go I can leave.

Come on Igy, these were the posts I was referring to:



[/quote][/quote][/quote]



At least he admitted that he wasn't sure of his "theorum" here:







Give him a break guys. He's asking a TON of n00bie questions....I don't know crap about thermodynamics, just took everybody's word for it that it's better for exhaust gas to stay hot. I still remember the days I didn't understand what a wastegate did till I took apart an actuated turbo. Just takes time to learn and he's here to learn. Sure he argues a lot, but this board wouldn't be fun if we didn't argue(Dragon and ZeroBanger was a great thread)



When he makes a mistake on "theories" Correct him! But when someone tells epion to go away...when that particular person(from what I've seen) hasn't contributed JACK **** to the single turbo forum then that person needs to shut his mouth and contribute something "informative".

ditto i like having epion here...its kinda nice to have a new topic discussed every now and again. sure epion has his moments but who here doesnt.

He's rubbed alot of people the wrong way. I think it has a lot to do with the fact that he asks a question, waits for people to respond, and then trys to answer his own question. To ask a question is fine. To ask for clarification is fine. To state an answer (usually off the wall) to his own question later is annoying and gives the appearance of an arguement. If you don't like an answer or get conflicting answers go look it up yourself somewhere else. I think most of this could be squashed if he put his theory in his first post with his question.

Some of you guys remind me why I don't like to go to my inlaws, my wife has six sisters and they are always arguing and wining about some thing or another https://www.nopistons.com/forums/pub...IR#>/wacko.png .

back to the topic of discussion , I have been working with very large "turbos" for the past 12 years , difference is these are HUMONGOUS compared to a turbo but the designs and principles remain the same.

These turbines are powered by 1500psi high temperature steam , they consume 112tonnes of steam per hour , so the velocity of the steam flowing through the turbine is pretty high , but there is one thing I have learned over the years , if the steam isn't at the right (very HOT) temp then the turbine WILL NOT be able to develop all of its rated 60000hp , there is even an auxiliary system in place to "SUPER HEAT" the steam.To make a long story short turbines require KINETIC , POTENTIAL and THERMAL energy to function properly.

On a ROTARY engine however , enough exhaust heat is never a problem , in fact the problem is having TOO much of it . If you want your turbo to last any amount of time you should NOT wrap your runners and / or put any type of heat shielding on the turbine housing.

These types of insulation cause TOO much heat retention which eventually (in a short space of time) causes the oil seal to burn and even melting of the edges of the turbine blades (the edges become serrated and don't work properly as the clearance between the blades and the inside of the housing opens up) both resulting in reduced performance and eventual failure of the turbo.

Wrapping and shielding makes a bigger difference with piston motors because they run a lot cooler on the exhaust side , so any additional heat translates into better turbo performance , for us there isn't any noticeable improvement in performance but a very noticeable change (increase) in exhaust gas temperature and an accompanying reduction in turbo life.

Those are just my two cents https://www.nopistons.com/forums/pub...#>/biggrin.png , I am not going to join the argument , I am just sharing some things I have seen , read and heard , I know how expensive this **** can become , I also don't want to see another little WANKEL be accused wrongly!! https://www.nopistons.com/forums/pub...IR#>/bigok.gif

What do you work on? Nuclear powerplant stuff?

Various Chemical plants making Methanol , Ammonia and Urea.

Scary.







Can I have some methanol? https://www.nopistons.com/forums/pub...#>/biggrin.png

makes sence, thanks for some great info

I only sell methanol by the tonne , 1 tonne = $300USD. https://www.nopistons.com/forums/pub...#>/biggrin.png