Jump to content
SAU Community

upgrading; ijectors/turbo questions?

GunMetalR33

By GunMetalR33,
in Engines & Forced Induction

 Share

Recommended Posts

GunMetalR33 Mentor

GunMetalR33

Posted
Posted

Hi,

I am planning on upgrading rb25det turbo to a GT30 hybrid, the hpInABox one (has a machined nissan zaust housing) I have all the supporting mods except injectors and Z32 AFM. I am hoping for around 250rwkw.

1st question is there anything I should be aware of when removing the current turbo and replacing it with the gt30. I will have all the water & oil lines and the spacer required in between the turbo and manifold??

2nd question is what injectors should I go for. At the moment I am thinking of either HKS or Nismo 555cc ones which will cost about $900. But you can get 740cc for slightly more, should I get the bigger ones seeing to price difference is only about $100???

Last Question, there is another member on this forum who has made 260rwkw with this setup but did it running 20psi. Is 20psi of boost too much for stock internals on a rb25det?

any comments are welcome...

Link to comment
https://www.sau.com.au/forums/topic/82537-upgrading-ijectorsturbo-questions/
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

turbo - if you have all the swapover bits then it will be fine.

Just need a new dump and I/C intake piping made up to suit i'd say.

are you using a PowerFC?

if so get the nismo 740's IMO. For about $20-$40 difference you might aswell just incase you want more power in future.

I think the 555 nismo are the RB26 items... but then someone else said they are making em too... but i couldnt find anyone stocking 555 for the RB25 about a year ago.

No such thing as too much boost really... As long as it isnt knocking it should perfect internals wise.

Not sure how the headgasket will holdup @ that much.

Although i havent heard of it being a problem ... and i think INASNT has a stock headgasket.. send him a PM to find out.

Craved Grand Master

Craved

Posted
Posted

dont forget that the bigger the injectors the more hassles you'll have at idle...

i just put SARD 550cc inj in my rb25. diret fit and and these can handle over 330rwkw without an adjustable Fuel pressure regulator.. so uless you plan to go over that... i'd use the smaller ones just for ease of idle quality.

Cubes Grand Master

Cubes

Posted
Posted

Sards work and are cheap but have been known to have a poor spray pattern. Idle quality and fuel economy will suffer as a result.

Their twin-hole injectors may be better, I haven't heard much about them as of yet.

Nismo and HKS are always a safe bet.

nizmokid Mentor

nizmokid

Posted
Posted
Sards work and are cheap but have been known to have a poor spray pattern. Idle quality and fuel economy will suffer as a result.

Their twin-hole injectors may be better, I haven't heard much about them as of yet.

Nismo and HKS are always a safe bet.

Sard injectors are cheap, but still have to buy the collars to support them in your car and they are around $250 mark so in the end the the nismo injects would cost the same and have less hassles to bolt into the car!....I will be ordering HKS or nismo injectors around the 550cc size!

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
dont forget that the bigger the injectors the more hassles you'll have at idle...

incorrect, plain and simple.

If your tuner cant get 740's to idle like stock ones with a PowerFC then its time for a new tuner

GunMetalR33 Mentor

GunMetalR33

Posted
  • Author
Posted

thanks again guys, a couple more q's:

1)Anything else that I need when buying new injectors, like washers etc???

2)After I install the z32 AFM, do I select "super intake" in the PFC options or is it the other option for z32??

3)What/where do I make the injector correction for 740cc or 555cc injectors in the PFC?

I am asking these questions cause I need to make sure that the car will travel to sydney from canberra after the installations... At this point I am looking at putting the Z32 on, the GT30 hybrid and leave the injectors to the tuner.

Dale FZ1 Veteran

Dale FZ1

Posted
Posted
1st question is there anything I should be aware of when removing the current turbo and replacing it with the gt30. I will have all the water & oil lines and the spacer required in between the turbo and manifold??

Is there a reason why you have a spacer? Is the turbo physically too large to fit, or is there a difference in the flange pattern?

The Mafia Grand Master

The Mafia

Posted
Posted
Is there a reason why you have a spacer?  Is the turbo physically too large to fit, or is there a difference in the flange pattern?

I'm doing this and the reason you need the spaceer is because ht compressor cover hits the exhaust manifold when you rotate it to fit. It is also a little close and will mst likely draw in alot of heat.

also, its handy to make the rest of the plumbing fit.

GT30's are hard to low mount, but do-able.

Cubes Grand Master

Cubes

Posted
Posted

GunMetalR33,

I am going to go a slightly different way of making similiar power.

I am going to use the slightly larger VG30 turbine housing, have it machined and bolt it up to a 700382-12 CHRA.

The 700382-12 CHRA is the new gen GT30 comp wheel, it runs the .6 comp cover so it 'shouldn't need a spacer.

The stock RB turbine housing is a tad small, consider grabbing your self either a VG30 turbine housing or VLT.

However, the VLT turbine housing will require a new dump pipe but they are much easier to get a hold of.

With the above setup you will crack 270rwkw easily and possibly even push very close to 300rwkw if not over with a set of cams.

'Should' :(

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Murray_Calavera
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By Murray_Calavera · Posted

      @joshuaho96 Hmm considering the drama you've seen/experienced, have you looked into getting a built complete long motor shipped from Australia?  Considering the AUD is basically monopoly money when compared to the USD, at a glance this seems like a good option?
    • Shoota_77
      R32 GTS-t RB30 sedan

      By Shoota_77 · Posted

      Bloody Skylines, they put you through the bloody wringer! Stick at it! Stunning drag strip BTW! Where is it? Can see part of the name on the slip and probably should just Google it!
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I mean the other day I had to walk someone through diagnosing why their timing belt was walking off the cam gears. At least one of the issues was a bent tensioner stud. Local mechanics have found runout on the CAS mechanism causing weird failures. I'm also no saint here I've documented some of the things I've had to learn the hard way. Something I discovered recently is that my CA emissions catalytic converters weren't even welded correctly to align the downpipe to the main cat and they tossed the support bracket that goes from the transfer case to the downpipe to support everything there. I spend a lot of time chasing down these decidedly unsexy problems and the net effect is it feels like I never actually get to the original objective (flex fuel, VCAM, oil control, cooling, etc).
    • r32-25t
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By r32-25t · Posted

      At times with how you make everything sound, all I imagine Americans doing when they see a gtr is standing there looking at it and bashing it with a gun like how a caveman would with a club and hoping it fixes itself 
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I think this is just a product of how the US market works for this stuff. Shops are expensive and there's no real way of knowing what kind of results you're going to get, people don't really have the institutional knowledge. I have heard too much at this point to really put faith in anybody "full service" except maybe DSport and they aren't really a full service kind of shop. If you go to the right place I have no doubt they'll get it right for you. Some locals have set it up right but the cost really is nuts and even now they're still fighting issues. And you know I'm a crazy person who thinks things like twin scroll, relatively short low-mount cast headers, PCV recirc to intake, recirculating BOV, right-sized for ~400 whp, MAF load, validating all of that to a standard comparable to OEM test programs, etc are relevant. For what it's worth, multiple local owners at this point have been stuck in a perpetual cycle of blowing a motor -> getting someone to rebuild it -> some missed detail causes the bearings to wipe and spin just outside of break-in mileage or drop valves or some other catastrophe -> cycle repeats. I usually only find out about this because I'm perpetually helping random friends with diagnosing car troubles, Skyline or otherwise. The single turbo stuff if I'm honest is mostly secondary, it just doesn't seem to achieve the numbers in the ~2000-3000 rpm region that I would expect given the results I've seen here or in Motive's videos. I don't really know what we're missing here in the US to be causing this. Lots of people like to emphasize the necessity of finishing the project first and foremost, but I'm not made of money and I can't afford to be trashing a 15k+ USD engine build with any regularity. Or spending my relatively limited garage time these days unable to triangulate problems because too much was changed all at once. Also, even if it isn't a catastrophic failure I would consider spending the cost of single turbo conversion with nothing to show for it to be pretty bad. 
×
×
  • Create New...