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About To Go Do The Hks Gt-rs Route

nsta

By nsta,
in Engines & Forced Induction

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nsta Mentor

nsta

Posted
Posted (edited)

Hey guys, just need to know if theres anything ill need to support the hks gt-rsturbo kit against what i have now

Heres my current mods:

R33 skyline gts25t series 1 '94

3" exhaust into split dump pipe

hybrid FMIC

Apexi pod

Splitfire coilpacks and ngk bcpr6es

new fuel filter

bosch 040 fuel pump

sau boost tap

stock ecu

stock turbo running 10psi

Im aiming for around 250rwkw......heres a list of things i dont know whether i need or not:

nismo injectors(550 or 700cc)

apexi powerfc

new head gasket

Fuel pressure regulator

turbo manifold?

And my other question:

whats involved in the replacement from stock to hks gt-rsturbo kit?and does the kit come with everything ill need to bolt it all straight up?, is it a low turbo mount(will i need to change the manifold)?, and how much labour involved approx, im thinking of doing it all myself.

I know alot of people on here have done it, i just want to do it right the first time, meaning i will buy all the supporting mods now, instead of headaches in the long run....need some real world advice thats all.

Car is mainly street, never sees track work, and is on toyo t1rs 235/265, with coilovers and camber bushes for the rear, still a bit of suspension work to do.

Edited by nsta
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PM-R33 Grand Master

PM-R33

Posted
Posted

Im waiting on my GT-RS as we speak (should be here in a week), its a direct bolt on to everything and comes with new lines that you will have to put on. To get the most out of it you will need an aftermarket ECU and bigger injectors (550cc will be enough). Shouldnt need a fuel pressure regulator if you get the bigger injectors but it can help for tuning. Head gasket is not really needed to lower compression untill u start getting near 270-300, even then some people dont go a different head gasket.

Good turbo choice :)

Adriano Grand Master

Adriano

Posted
Posted
Im waiting on my GT-RS as we speak (should be here in a week), its a direct bolt on to everything and comes with new lines that you will have to put on. To get the most out of it you will need an aftermarket ECU and bigger injectors (550cc will be enough). Shouldnt need a fuel pressure regulator if you get the bigger injectors but it can help for tuning. Head gasket is not really needed to lower compression untill u start getting near 270-300, even then some people dont go a different head gasket.

Good turbo choice :)

Agreed, but definately dont get a fuel pressure reg.

Al Grand Master

Al

Posted
Posted

ECU and Injectors are a MUST to get full potential out of the turbo/engine.

The GT-RS kit is made to be a straight bolt on. In the Jap instructions you'll see that it would still bolt on to the std airbox, smic, and ext manifold :thumbsup:.

At a later stage (if you want more power) i also recommend fitting the Tomei Poncams; these sticks work great with the turbo.

Below are a couple of my graphs, but i have the Poncams and extensive head porting (neither are needed, but do produce more power). Ignore the red line, in the graph, as the graph was done as a comparison between two different exhaust systems (red was my previous sys). The blue line was my final tune on 18psi.

post-1811-1183858520_thumb.jpg

post-1811-1183858541_thumb.jpg

Al Grand Master

Al

Posted
Posted

A GT-SS on a rb25det is too small.

The smallest i'd go would be a GT2530, but you'd only get about 210-220rwkw. Responsive as all hell though :thumbsup:

Just to let ppl know: Extensive head porting will introduce a little more lag into the system (about 400rpm)

PM-R33 Grand Master

PM-R33

Posted
Posted
sweet!, let me know how your goes mate, im after the most responsive setup i can get, and i thik the gtrs fits the bill perfect....alright, ill keep the injectors in mind

Yeah no worries dude ill let you know. Ill just be running the standard ECU and standard injectors for now and see how far i can push that setup. If it's not good enough for the time being ill chuck the SAFC on there untill i get some money for a Power FC and 550cc Nismo injectors. Then the fun will begin :P

Adriano Grand Master

Adriano

Posted
Posted
ECU and Injectors are a MUST to get full potential out of the turbo/engine.

The GT-RS kit is made to be a straight bolt on. In the Jap instructions you'll see that it would still bolt on to the std airbox, smic, and ext manifold :P.

At a later stage (if you want more power) i also recommend fitting the Tomei Poncams; these sticks work great with the turbo.

Below are a couple of my graphs, but i have the Poncams and extensive head porting (neither are needed, but do produce more power). Ignore the red line, in the graph, as the graph was done as a comparison between two different exhaust systems (red was my previous sys). The blue line was my final tune on 18psi.

Awesome power curve, congrats dude

Al Grand Master

Al

Posted
Posted
Yeah no worries dude ill let you know. Ill just be running the standard ECU and standard injectors for now and see how far i can push that setup. If it's not good enough for the time being ill chuck the SAFC on there untill i get some money for a Power FC and 550cc Nismo injectors. Then the fun will begin :domokun:

STOP!!!!!!!!

What are you doing man?!?!

Get the ecu first, before the turbo, and run about 12psi on the std turbo.

The ecu will unlock soooo much torque and power, it will feel like a new turbo :thumbsup: It was one of my best upgrades, second only to the turbo, which should be done after the ecu.

You'll also need a new, bigger, fuel pump when you get the turbo; possibly before hand, depending how good/worn your std one is.

Al Grand Master

Al

Posted
Posted
Awesome power curve, congrats dude

Thanks buddy.

Only had it like that for about 5000km before my std bottom end gave up after a track day (low compression in #3: 83psi) :(. But car is only used on weekends(sometimes) and events. Done a couple of motokhanas, cruises and one track day, then oil out the new B&M pod :domokun: . But i do drive it hard at these events :P.

Now rb30det, with GT30R(500hp) (gt-rs too small for the rb30), greddy plenum and a few extra goodies. Only going for about 280-300rwkw, but will hit full boost (20psi) by about 3300rpm and make power till the 8000rpm rev limit :thumbsup:

The GT30R was the smallest recommended turbo for this setup.

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