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RB26 GTX Cores in factory housings best choice?

RB335

By RB335,
in Engines & Forced Induction

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RB335 Rising Star

RB335

Posted
Posted

Hi Guys.

I'm wondering has anybody experimented with GTX cores inside factory turbo housings, it doesn't seem these are widely available but people such as Munro do offer rebuilds
using GTX Cores.

I'm wondering if I could get for example -5 like top end, with -7 or -9 like low and mid range, I'm keen to hear you guys experiences as I can't quite find too much information on
the internet on it.  Cheers.

sneakey pete Grand Master

sneakey pete

Posted
Posted

Yeah. Got it done, didn't end up using them.

Few ways to go about it. The gtx2860 cores are the same rear as -5s, so you need to use -5 rear housings, stock ones won't work. You can make stock front housings work, at least the ones I had did though they had a 60mm wheel in them before I bought then blown. The turbo you get is going to be more of a slightly better -5 though.

 

In theory you could stick a gtx2860 front wheel onto the front of a -9 core and get a -9 with more compressor. This may work well I think, as the compressor on a -7 will max out, however yoi may find the rear chokes to much . (-7/-9 are smaller rears than -5, hence less lag). I heard rumours someone was trying to make a set of these but I don't know how they went.

 

Hks just released some new billet front wheel turbos, no results on them yet.

Piggaz Grand Master

Piggaz

Posted
Posted
45 minutes ago, sneakey pete said:

 

Hks just released some new billet front wheel turbos, no results on them yet.

Yeah. If you look carefully they're journal bearing. Really? 

They also produced a dyno graph which I would take with a grain of salt. The overlay between 2530's and RS's is not accurate. We all know how much worse RS's are compared to 2530's.

 

 

baron_von_bootsector Enthusiast

baron_von_bootsector

Posted
Posted

I had something similar done with my -5's by Procharge and they turned out pretty well, its a very cost effective path forward if you want to stick with stock looking low mount twins.

They upgraded the compressor housing to a .60 (from .42) and put in GTX2687 wheels, while porting out the turbine housing to get the best possible flow as they are a little small for what a lot of people try to push through them.  I have been very happy with the results so far but due to the displacement bump on my car (2.6 -> 3.4) its not possible to do a fair back to back...

GTX hybrids.jpg

hypergear Grand Master

hypergear

Posted
Posted

My experience high flowing Twin GTR turbos internally gated is the turbos has issues dumping back pressure through a 3 or 3.5 inches exhaust. -5 on stock cams is very laggy, without been able to dump back pressure, fancy billet wheels can not run into their peek efficiencies. I've personally used -9 specs in my own GTR, pretty happy with that and thats recommended for road and track use.

  • Like 1
baron_von_bootsector Enthusiast

baron_von_bootsector

Posted
Posted

Piggaz - Its heading in for the final tune in just over over week but on the run in tune (standard 98, wastegate pressure (~15psi) and zip in terms of timing) it knocks out 342KW at the treads @ 4600rpm. Will post up a full build post when its tuned as my previous build post got rejected / deleted...

 

 

discopotato03 Grand Master

discopotato03

Posted
Posted

I reckon the best replacements based on standard sized RB26 compressor and turbine housings is the -9 turbos . They may not have fancy CNC'd compressor wheels in them but they appear to work very well in a 2568cc 1500Kg GTR . They are not a ring in but a dialed in unit so a result is not a fingers crossed guess .

RB335 Rising Star

RB335

Posted
  • Author
Posted (edited)

Hi Sneaky pete

Why didn't you end up testing them?  Do you still have them?

Yes i had read that whole thread a while ago, and recently re-read it all.

There was one guy who said he had great success, e.g 80hp more than -5's with -5 like response.
But I don't get why others say the GTX will hardly offer any more efficiency when trying to use RB26 style housings,
example how Tao at Hypergear is saying it wont really work out, I'm just trying to see where the confusion ends
as so far only 1 person has sumbitted awesome feedback, but most turbo shops and builders say the GTX just wont give any real benefit.

What's the go with the new HKS units?  
Link?  Are they bolt on to replace factory RB26 units?

Edited by RB335
  • 4 weeks later...
TXSquirrel Community Regular

TXSquirrel

Posted
Posted

I am very interested in knowing as well.  This past weekend I talked to another guy running -5's with GTX in his R33, and he likes it very much.  But for my own setup I have been looking at standard -9's for a while, and so far I can't find any information/feedback on upgrading standard -9's with GTX. 

sneakey pete Grand Master

sneakey pete

Posted
Posted

What I'm saying is the gtx and -5 rear is a bigger wheel than the -7/-9, so it's going to be laggier but have more power potential. There isno best turbo, all depends on your goals.

Didn't know atp is making kits, go any info/links?

TXSquirrel Community Regular

TXSquirrel

Posted
Posted
11 hours ago, sneakey pete said:

Didn't know atp is making kits, go any info/links?

ATP probably has one of the worst websites to navigate...  Go to GTX section of the website first, then click on the size of 'GTX w/o turbine' you want and you can find additional options.  Here is the link for -5/-10 housing, you have to scroll all the way to the bottom and the last option available is to add .64 a/r T25 -5/-10 housing for $225.42 USD.

http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=GRT-TBO-188&Category_Code=GTX

 

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