[jamie gtst]

(skyline gtst) im hopefully going for a 500-600bhp engine build over winter (my first ever engine build) but i am trying to gather as much information as possible first. what im mainly stuck on is what turbo to go for as there is so many differant ones out there and i dont really understand what the specifications mean on them. i dont want a turbo that is going to have lots of lag but then i dont want one thats going to run out after around 6k, all you ever here people say is strap a massive turbo on but from what i understand this is not exactly a good thing. if anybody can give me information on what things mean it might help me to work it out abit myself for example:

what compressor A/R size is best and how does this control boost
what exhaust A/R size is best and how does this control boost
whats the trim and size mean (example .57)
what causes lag or max boost too early??
are skylines oil and water cooled
whats the best fitment t3 or t4 or are these the same?
do the intake and outlet sizes matter (example 4" inlet 2-3" outlet)
is an internal wastegate or external wastegate best?

sorry for all the questions but you have to start and learn somewhere and turbos are quiet expensive so i would like to get it right first time, maybe if you listed your turbo and engine spec and what pro´s and con´s you have faced with it???

thankyou very much in advance for any advice given, jmaie :drivin:

 

[For-Tune PVE]

My suggestion would be for you to buy a book or three on turbocharging and principles thereof. Read up (since you're not going ahead with the rebuild for a bit yet), perhaps start browsing for turbo specs online (and asking people for their engine/turbo specs as you are doing) then consider buying a turbo through a Skyline specialist, so you get their advice and experience, while potentially paying slightly more or less than you could've done if you'd bought from a huge turbo-dedicated company. Owen Developments are one of the most knowledgeable companies in the UK, if not the world, when it comes to turbo's (development, fitting, speccing and sale of), and Mark who works there has done his fair share of Skyline engine work. I would speak to them once you have a better idea of the workings of a turbocharged engine, and once you have a good idea of your goals and engine spec

 

[jamie gtst]

what do people think to a greddy t78??

 

[Bigchief]

what do people think to a greddy t78??

its a god turbo but really laggy, and yr have to rebuild with forged internals, this tubby is around 650bhp mark,

 

[jamie gtst]

so rebuilding my engine with a gtr crank steel rods forged pistons and steel head gasket will work fine??

any better suggestions for 500-600bhp?

cheers jamie

 

[Galsky]

Tdo6 25g will start to spin up around 2300-2500rpm.
its good for 550+bhp.

gal

 

[dellaruse]

i got meself one of these>made 393 atf @1 bar. so should be good for the 500. with stronger internals and more boost!

 

[Bigchief]

if you look at this thread it will show you what you will have to do to achieve that power mate....http://www.skylineowners.com/forum/showthread.php?t=64295

 

[BIG.SMOKE]

dellaruse how can you have a turbo like that and not up the boost !!!!

 

[dellaruse]

Need to get me new clutch in (in progress) and also metal gasket (going in soon) and then turn up the boost and see what happens, also got Jun style inlet plenun and throttle body to go on. should see some better figures after re-map.....

 

[floyd]

For the kind of power you are wanting I would go for a GT30R turbo, good responce and will just make what power you want. Forget T78...old technology and way too laggy for your application.

 

[nailsgtr600]

ive got a spare gtr engine if you fancy a engine swap!!!