Draw through system is much more simple it eliminates the use of a inter cooler and some say its much easier to tune the carburettor for it than it is for blow through.

its simply just like a normal turbo setup but instead of the boost going through the carburetor (like blowing in) thier is a carburetor places on the intake part of the turbo which suck in the fuel and blows it out to the inlet manifold.

it shuld be as effective to blow through to some extent (because of no intercooler) but as mentioned water injection can be used to cool the incoming air.

these links should help.

http://datsun1200.com/modules/mediawi ... hp?title=Forced_Induction

http://datsun1200.com/modules/mediawi ... p?title=Topgear_A12_Turbo

The topgear one uses a suck through system.

how fast does a T25 spool?

@lamb_daiquiri, i have never seen a draw through setup, can you guide me here, thanks

@supafatto, ok, i will look for a good T25, but if i cant find one due to limited resources in this country, is it ok if i go with the T3?, the carby is a Hitachi DCH306, i think the standard A12 caby, although no vacuums are connected as i am running a performance Air Filter...

ok then i should custom make the pipes ad not use the rubber ones, right?

If funds are limited a draw through set up with water injection may be a good option. There are some pretty simple ways of squirting in some water. A good rule of thumb is to limit water flow to match maximum fuel flow. You might need to bust out your calculator.

Simplest system I've seen uses boost to pressurise the water bottle and squirt water in before the turbo through a fine atomiser (spray head), you need small droplets to avoid eroding the compressor quickly.

With a t3 I'd expect boost to come on very late over 4500rpm, as far as jet size depends on carbi being used!
As for the rest cooler piping most use 2.5inch or 64mm, steam pipe and around 1 1/4 inch steam pipe I think!

Thank you All for the Replies, @unfamilia, thanks i did search, but i wanted to know f anyone has specifically used a T3, @ D, thanks,

@supafatto, Thanks alot for your advice, i have a few questions though, i hope you dont mind, :)...

i want the boost to come around 3500 to 4500 RPMs, can the T3 do that, i dont have much choice on the Turbo as its the only one i got, here in Pakistan its very difficult to find turbos in good condition, and the ones that are are way to expensive, Is 8psi safe? how much HP was Yours Pushing with 7psi?? and most importantly i will be doing it on a Carbie, i dont have much cash to spare, The intercooler is a top mounted one, would that work?, i have seen images of projects with the box system on the carby, is that better? what would i need to upgrade, like carby jets e.t.c, there are rubber pipes for the turbo to intercooler and to carby, would that do?, what should the diameter of the turbo manifold be? and exhaust pipe? sorry for so many questions, i hope you can help me out here... thanks a million, brother :)

:) T3 is to big for A12, I'd go smaller! I had a t25 custom piping and ran 7psi!
Stock internals will deal with 10psi but MUST be cooled! There's heaps around! You'll need to decide efi or carbi, then budget, and go from there

especially look up topgear and supafatto as usernames

Search the wiki or use the search bar- lt's all been covered before.

Just need manifolds (which are custom) and piping. Choose efi or Carby (draw or blow through) etc etc