Rb25 Turbo Kit Help Making A Decsision.

[75coupe]

oh snap...!!!

[Irwin123]

Well, i rang my tuner and he said he wouldn't want to put more than 18spi through my motor,

He suggested i get an e boost street, and have one set at 12 psi, and one at 18.

18 for short runs, but if i head to the track 12 - 14 for reliability.

However the ATR43ss -2 makes 20psi at around 3700, and 18 psi minimum.

The chap from hypergear said with 18psi i could expect 270-290rwkw.

The turbo will be $1680 shipped,

However for this price i can purchase a 3076, which i thought spooled about the same, and made around 300rwkw on 18psi with the .82 rear housing.....

However will i need aftermarket oil lines? and i would have to get the exhaust setup for a diffrent flange, suppose its all $$$ but an extra 20-30rwkw, and you can run less than 18psi im fairly sure?

The HKS 2835 pro s looks great , and has great resultts, however im not willing to spend that much $$$$

keen to just get my car done and dusted, if possible with some coin left in the bank

So now i am even more confused than when i started

[DVS JEZ]

Haha. Plenty of options. Every one has there own opinion. We all know what Hareys is lol. Jks

[Irwin123]

haha, well you can get an external gate 3076 for $1300, and i have a 321 stainless manifold at home.

Will a 38mm wastegate be big enough for this setup?

would it let me run 13-14psi with a .82 rear?

If so the manifold has a 38mm wastegate flange, can get wastegates cheap.. So the whole setup may be around 1700 with the exhaust done... might be the way to go?

it gets so frustrating sometimes haha

[scotty nm35]

Well, i rang my tuner and he said he wouldn't want to put more than 18spi through my motor,

18 psi with a TO4Z would be niiice.

Why is the boost level important?

[Irwin123]

he said that the stock manifold above 19psi he has had to put a fair bit more fuel in certain cylinders.

pretty sure its a combination of boost and power, he said 320rwkw and 7400 rpm max on a standard rb25 for a street car.

I wouldnt think you could run 28psi on a standard motor for too long even if its only 300?

just going off what he said,

[Mick_o]

Alot of guys in here run 20+ psi pretty safely as long as you have the fuel to keep up to it and the motor aint knocking i dont believe there is a prescribed amount of boost level that wont be safe obviously the condition of your engine has to be taken into consideration also. Hks dont make the pro s anymore so unless you find a 2nd hand kit its outta the question and the hks 2835kai kit wont give u the power u r chasing. My Gtx3071 kit cost me $2600 and had oil and water lines and the dump pipe cost me $250 which was a steal so realistically if u dont have at least 3G's to burn on a turbo forget a 3076 mate and look at ya kando or hypergear options cos oil lines wouldnt cost anymore than few hundred on top of the price and thats if they bolt up to the standard dumpy and in saying that generally speaking anything that bolts on to the nissan front pipe wont make anymore than 260kw unless u have an external gate which = more $$$. Hope i aint confused u anymore lol if $$$$ are an issue look for used goods but run the risk of buying some1 elses problem

[Mick_o]

Trust me dude my 288kw feels awesome ive never been in anything with more and obviously diff and suspension setup come into the equation but id imagine 300+ would start to be unusable on the street with a rwd. Traction issues! And in all honesty mate if u dont have some form of decent lsd and brake and suspension mods 300rwkw is gunna be bloody dangerous lol!

[SargeRX8]

This is my dyno on the dyno dynamics of the SS2. Remember though Jez when you ran my car on your dyno we did pull out some timing and also your dyno boydy said it sometimes reads low but feels very different on the street. Ill PM you a pic of my intake pipe now.

The SS2 on my first tune. This was the last read out showing no boost controller, the low then high. It doesn't show 244 in this, more like 238 but the few runs before was 244 and the tuner thought the turbo might be getting hot after that many consecutive full runs.

Also attached is the final tune.

[discopotato03]

GO33GO got by with poncams GCG OP6 Hi Flow and I think the Gready knock off and an OE GTR front mount . I think it had adapters and GTR injectors plus an 32 GTR pump , 33 ones drop in . Later it was rebuilt with slight porting and slightly oversized pistons . Gary said it cranked out 266 at Insight and went real well for an S1.5 GTS25T .

Same same , if 266 can float your boat you won't need the expense of 300 Kw injectors pumps etc .

It may be worth waiting to see what Garrett turns up with when the GT28 based GTX turbos arive . I'm seeing hints that they want to have T3 flanged twin scroll turbine housings to cover the GT28 to GT35 BB turbo range .

Me thinks that if you can screw 265 odd out of a GTRS you may get a bit more out of a twin scroll GTX2867R depending on housing sizes and wheel trims . With the right housings they may even put together something a little better than a GT2871R/GTRS and if it added up to 270 at the treads its convienent isn't it .

Personally I would do the turbo last but have a realistic idea of what 250-270 kw feels like because over builting is money wasted .

A .

[SargeRX8]

Fact 3: if you were to have some kind of race with bolting up the HG compared to the hks I can promise you the hks will be on and strapped up on the rollers while you are still working out what to do with you water lines and wondering why the dump is fouling on the air con drain.

I done it in a couple hours. Biggest dick around was that I forgot to put a washer back in and lost most of my coolant. This statement is wrong.

My old car had a 2835 of some sort fitted into the stock housing. Spooled quick as f**k and sounded tops. I was going to go a similar path but the money for a proper unit was too far. Supporting mods, you can't factor that in as both turbo's will need supporting mods.

Fact: Both HKS and HG turbos need a new, custom intake.

Fact: Both HKS and HG need supporting mods

Fact: Both need aftermarket dump

Fact: Both can run standard lines(fairly sure the HKS can).

I never had any issues with the air con drain being fouled. If HG had the money, the people, the time that HKS has to work, design and build turbo's.... well. HKS has been in the market for how long. Stao has been a one man building these by him self. His work is remarkable.

Also, I am RARELY on full throttle. Ask Jez, the car felt sweet when we were on the road and I didn't go near full throttle.

Low boost 14psi SS2 from 2500rpm to 6krpm.

Watch from 1:00

Edited December 8, 2011 by SargeRX8

[zebra]

I done it in a couple hours. Biggest dick around was that I forgot to put a washer back in and lost most of my coolant. This statement is wrong.

My old car had a 2835 of some sort fitted into the stock housing. Spooled quick as f**k and sounded tops. I was going to go a similar path but the money for a proper unit was too far. Supporting mods, you can't factor that in as both turbo's will need supporting mods.

Fact: Both HKS and HG turbos need a new, custom intake.

Fact: Both HKS and HG need supporting mods

Fact: Both need aftermarket dump

Fact: Both can run standard lines(fairly sure the HKS can).

Fact!

You have nfi!

[DaveO74]

I done it in a couple hours. Biggest dick around was that I forgot to put a washer back in and lost most of my coolant. This statement is wrong.

OK may have been generalising here to make my point but we all know that this has happened

My old car had a 2835 of some sort fitted into the stock housing. Spooled quick as f**k and sounded tops. I was going to go a similar path but the money for a proper unit was too far. Supporting mods, you can't factor that in as both turbo's will need supporting mods.

What do you mean 2835 in stock housing??? So you mean you had a highflow

Fact: Both HKS and HG turbos need a new, custom intake.

The 2835 Pro s kit comes with a new intake pipe made for that turbo, personnaly i chose to make a bigger one that that was my choice, nothing wrong with the one HKS supplied

Fact: Both HKS and HG need supporting mods

Agreed

Fact: Both need aftermarket dump

True, but again the Pro s kit comes with a dump (or front whichever waty you wanna say it), so if you already have a front pipe (as in two peice setup)your laughing

Fact: Both can run standard lines(fairly sure the HKS can).

You can but again the Pro s comes with all lines needed, including extra lengths and bends for the BOV return

I never had any issues with the air con drain being fouled. If HG had the money, the people, the time that HKS has to work, design and build turbo's.... well.

HKS has been in the market for how long. Stao has been a one man building these by him self. His work is remarkable.

I totally agree with this also, and have said it over and over, the thing that annoys me (and others) as it does the HG guys, is the fact that a direct comparison is always made to the 2835 and HG...... but when one of the 2835 owners stands up and says "hang on, the 2835 DOES come on full boost by XXX rpm and it DOES deliver torque the same way as Staos new turbo" we are told we are fudging dyno results or changing ramp rates.

I am the first to admit I paid a small fortune for my turbo, but I am happy I did it and for me it was the right choice. Im not going to go and spend thousands of dollars on bolt on parts and detailing an engine bay etc the then skimp in the heartbeat of the engine.

I still stand by me previous comment that the HG seems to need more boost for similar results, again that is not to say the are a lesser nor greater turbo just an obsivation.

I will also say again i have owned a HG before my last lot of upgrades and I was very happy with, I just didnt like having to run the amount of boost needed and the associated heat that comes with it, especially for a part time track car.

Also, I am RARELY on full throttle. Ask Jez, the car felt sweet when we were on the road and I didn't go near full throttle.

Low boost 14psi SS2 from 2500rpm to 6krpm.

Watch from 1:00

EDIT: Forgive the spelling, couldnt be bothered going back in to change it all

[75coupe]

^^^^^ +1 to everything Dave said, shame HKS doesnt have a formal representative on these forums...

[SargeRX8]

Fact!

You have nfi!

How so? Everything is technically correct. If you are lucky enough to find someone selling a full kit or find a brand new kit, congrats. When I was looking, I found the turbo by it self, hence needing a whole bunch of parts added to it. You pay for the kit for all those parts. There is nothing I said which could draw you to say I have nfi(even though I had nfi that they came in a full kit but that doesn't count lol).

I am in no way dissing the HKS turbo and no where did I say that people are bsing their dyno's. i believe you. I had a cropped up turbo in the stock housing(yes high flowed) and it was freaking awesome and I can only imagine the full hks kit would have been even better. When I was looking to buy a turbo, this turbo was an option but it was near impossible to find a complete kit. and in all honesty it cost a fair penny more to get up and running then what I have currently spent on my setup. It was more frequent to find the turbo for sale by it self, I never knew it came in a kit until now lol.

If Garrett made a complete bolt on kit for skylines, people would be on it. HG can go and build a full kit, he can get his dump measured and manufactured for X turbo no Y car to ensure it fits one time, every time. Or he can sell you a turbo and you make it fit.

[DaveO74]

Sarge not you in particular saying fudged dyno results, but others have.

[DVS JEZ]

Lets all just buy kando's

Sarge our dyno doesnt read low it just reads accurate

When we tune ur car maybe we can prove all these haters wrong.

Oh another thing, lets all meet up at the drags so we can seperate the men from the boys.

[DaveO74]

Why do we have to drive around in womens clothes to prove a point.................

See what I did there

[DVS JEZ]

Haha. We can borrow ur skirts. We all know u have a few

[zebra]

Oh another thing, lets all meet up at the drags so we can seperate the men from the boys.

Just give it 6 weeks so the HG guys can sort their issues out lol

P.s, Those that think Im rubbishing HG stuff, I'm not, its all in jest