The simplest way to find out if you have vacuum or mechanical secondarys is to get a mate to put his foot flat on the throttle ( with out the engine running) and look down the throats in the carby if both butterflys are open you have mechanical and if only one butterfly is open you have vacuum secondarys.

the fuel set up I am running is set up to have a set pressure of 5 psi and when manifold pressure goes above 5 psi the fuel pressure goes straight up to 14 psi.I set it up like this because I was on a budget but it works for the best because on boost it floods the carby (sort of) which works out well.
On the drag strip you can see just a faint puff of black smoke of the start line. Mind you the poor thing is leaves the line at 5000 revs. The motor I am running is totally standard and cops a floggin, It has done 22 runs down the quarter mile in two meets, and Ive only poped one head gasket and one standard diff, and Im gettin 15.2. I even beat a GTR skyline up to 60ft mark. then it mowed me

The box has a thread on the side of it and a bolt is screwed into this thread which hooks up to the butterfly inside the box and then the linkage is hooked up to the bolt on the out side. Ive got a pic of it but it is not real clear I will put it in the forum under "turbo carby" but tomorow Ill get a better one

I ran a BOV woth my set up but It gave me the s hits and proved nothing much so I took it out and the turbo's are still alive now

and a nother way to keep the turbo on boost between changes is not to take your hoof of the exagerator. just flat change it.
Its a bit harsh but its fun

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simply put u dont know what u r talking about!
when the compressed air is sent to urbine wheel via a vacuum hose it will b decompressed due to the vacuum in the manifold, thus lowering the temperaturen which is already lower then the turbine wheel temperature. thus it will having a cooloing effect. period.
heat is a relative term, boiling water is a very hot thing but if u pour it on a maximum hot engine it will still make it cooler.
barpk

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I changed this to simply put Barpk is a Wanker!
Mate all's fair to say you don't agree!
But don't say I don't know what I am talking about! You are the one asking for advice and then telling me I am wrong!

And you can think what you want to think but I never said the air was still compressed!
( Of course it isn't it has just come out of a pressurised pipe then out into the inlet!
So no sh@t it's not pressurised!)

But if you compress something it will get hot!
Yes when it is relaesed it will cool abit! but it isn't like a gas changing to vapour ( all it is doing is going from compressed air then to atmospheric pressure!)
It has not really changed state a great deal! so there is no way it could be as cool as fresh air!
And if you take this air which has already absorbed heat and then compress it again it is going to create more heat!

I am not saying this setup is bullsh@t as I do belive that this is use!
I don't know how good it is! and I don't know how bad it is!
But I do know that I understand the principals involved!

Tell me do you Barpk! ( I don't think you really do!)



****** CHEERS, thanks for the encouragement to make me bother to help you from now on! Barpk! *********

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i said same thing thats why i gave an example of a water pouring on a HOT engine, but u cant just accept that u were wrong at the first place. and now u r rephrasing what i have already mentioned

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u making no sense here!!
this air is going to get out via exhaust as soon as it passes the turbine wheel(as their will b vacuum in the turbine wheel), what makes u think it will b compressed again!!!!
i ask advice for what i dont know, that does not mean that i have to listen to whatever u say, wrong or right.
cool it bro......
barpk

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can u tell me from which car u have taken out the fuel pump? is it EFI or carb setup?
does the extra fuel goes back into fuel tank or not(loop)?
i have read that any normal fuel regulator can b made adjustable fewe modifications. what do u think of this?
barpk

Barpk step back and think about what you are going to write before you write it!
Also read exactly what others have written!

" this air is going to get out via the exhaust as soon as it passes the turbine wheel"
I think this makes no sense mate!

We are talking BOV ( i know I am! are you?)

Air has to go in the inlet of the turbo ( the compressor )
then through the engine then through the exhaust manifold to the turbine wheel then out the exhaust!

Please come back when you understand the principals of how an engine operates!
Then you can say this is how it works!
Otherwise ask how an engine works then you will start to learn!

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firstly whats the point of this ####ty PM to me! u shy about saying things upfront, or u expect me to b afraid or what...hehehe.

secondly u r TOTALLY wrong about what u r saying, learn or zip your lips.
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a turbo has 2 wheels, one TURBINE second COMPRESSOR, extra air from BOV goes DIRECTLY INTO THE TURBINE WHEEL not compressor wheel. Einstein.
and it does not get re-compressed it goes out via exhaust.
barpk

Mate the PM is because I don't feel everyone else needs to see it that is why!
( Why should I repeat myself in front of everyone when it is you that I have to keep repeating myself for? ( why? )

Now that you have started explaining yourself clearer I start to understand what you are saying!
Never seen this setup!
Don't know If it exsists but would love to see some pics of if!

And pls don't say I am wrong as everything I said is correct! and If you had bothered to read it correctly you would have noticed that i was talking about it going back into the compressor inlet!
If I was wrong from the start you should have explained this so there would not have to be as may posts!!!!!!!

most of OE cars with a BOV but without its whistle(or hsssshhhh) sound have this loop system. that sound goes back into the.......u know what i mean.
barpk

Barpk you maybe want to check the pic I just posted under " Plumb back BOV"

Cheers,
Steve!