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Old 20th July 2016, 05:50 PM   #1 (permalink)
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RB26 GTX Turbos in factory housings? Personal experiences and where to buy?

Hi Guys.

So I've been surprised that there is not so many people offering GTX Drop-in turbos for RB26. There are some people I have spoken to who say they can rebuild factory turbos with GTX wheels but none have personal experiences on how they respond.

I am wondering if anybody has gone down this route, what spec did you run and how do they compare to typical GT Series turbos like -5's, -7's, GT-SS etc.

I'm hoping if possible to get -5 like Mid range and top end power with -7 like response.

Cheers.
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Old 20th July 2016, 07:28 PM   #2 (permalink)
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We have done it currently my car has a billet wheel it's not a Garrett GTX wheel but one I had fitted same size etc with only very slight machining of the compressor housing. We can offer an upgrade contact me for details.

Key to response and faster spooling depends on many other configurations of your engine it's not just about a billet wheel.
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Old 21st July 2016, 06:26 AM   #3 (permalink)
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Been looking in to this as well.
Havenīt found any results yet but would be interesting to see if a pair of -5 with billet wheels could manage just a little bit more puff.
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Old 21st July 2016, 01:55 PM   #4 (permalink)
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Quote:
Originally Posted by FRRACER View Post
We have done it currently my car has a billet wheel it's not a Garrett GTX wheel but one I had fitted same size etc with only very slight machining of the compressor housing. We can offer an upgrade contact me for details.

Key to response and faster spooling depends on many other configurations of your engine it's not just about a billet wheel.
Don't suppose you have a before and after? I'd be interested to know how much difference the newer tech makes. I'm guessing ~5%?
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Old 22nd July 2016, 09:07 AM   #5 (permalink)
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Decent length thread. Have a read.

New Garrett Gtx2860R / 2863R / 2867R - Forced Induction Performance - SAU Community
Cris and Saifskyline like this.
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Old 22nd July 2016, 03:05 PM   #6 (permalink)
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I have read it before and reading again, seems I can conclude from it a guy had GTX2863 wheel put into his -5 housings and mentioned response was similar but with major increase in midrange and top end. I guess GTX2860 is the smallest GTX wheel available? I'd probably go with that one hoping it can respond like a -7 ?
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Old 7th August 2016, 09:06 AM   #7 (permalink)
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Quote:
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Don't suppose you have a before and after? I'd be interested to know how much difference the newer tech makes. I'm guessing ~5%?
Did you ever find this info Cris?

I have standard R33 turbo's with steel turbine's which were on the car when I bought it. I'm looking to get them rebuilt to the best possible spec for piece of mind that they have been done right, but I don't really fancy aftermarket turbos.

GTX in a standard housing sounds like an interesting option...
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Old 7th August 2016, 08:11 PM   #8 (permalink)
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I managed to get hold of the guy in Iceland that I sold a set to around 2 years ago. Got some feedback. He mentioned that over his regular -5 he hit full boost of 1.4 bar at 3600 rpm compared to 3900rpm with a set of Tomei Type A as a comparison.
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Old 8th August 2016, 08:50 AM   #9 (permalink)
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Had an interesting talk to the Garrett distributor here in Austria on Friday.

My Idea was to take the -9 and the GTX billet wheel which I would combine, machine the housing and have all the benefits of ceramic ball bearings and billet machined GTX wheel.

Unfortunately, Garrett doesn't provide the wheels separately. There is a no spare parts policy for the CHRA as I understood.

So what can be done is to buy a GTX CHRA and buy the -9 housing separately and make this conversion. The only negative thing is that the GTX doesn't come with a ceramic ball bearing atm. Only the Rallye version does, but with a price tag like it has, you could by nearly 3 standard GTX versions.

So, what I'm trying to say is, be careful when someone offers you a GTX wheel as it is most likely it is a copy or a different design, but not the original gtx wheels.

Another cool information was that the GTX CHRA as well as balancing are manufactured and assembled in japan

Cheers!
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Old 31st August 2016, 05:35 PM   #10 (permalink)
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Thought I'd post these up - https://www.z1motorsports.com/forced...67-p-6556.html

If my understanding is correct these are GTX turbos which wuld mount in/on the oem pipework
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Old 1st September 2016, 06:59 AM   #11 (permalink)
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None of the GTX specific CHRA - especially on the compressor wheel is anywhere near the -5. You then run the risk of going into the unknown and wasting money potentially. I know what I am doing with the conversion and although they are not genuine Garrett GTX wheels they are made by a specialist in the billet wheel industry. I'm not worried.
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Old 1st September 2016, 06:33 PM   #12 (permalink)
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Quote:
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None of the GTX specific CHRA - especially on the compressor wheel is anywhere near the -5.
The conclusion here is based on what exactly??
Is it too much to say that the blade design is brand new and more efficient than any other garrett blades (yes, including the -5) used until now? I would say having a smaller compressor wheel (inertia someone?) and achieving better results (as well as higher power capability as well as better spool up) than the bigger ones speaks for itself. At least that's what the people and the performance chart say.
Having not even 1 bar at 4000, I wouldn't say that the -5 are so great

Quote:
You then run the risk of going into the unknown and wasting money potentially. I know what I am doing with the conversion and although they are not genuine Garrett GTX wheels they are made by a specialist in the billet wheel industry. I'm not worried.
Why unknown? These GTX turbines are proven a lot of times already. Not only on skylines.

You have nothing to worry about with your blades. They are billet, therefore probably lighter than original but the design is basically just a copy of the standard, old garrett wheels with some small additions which might improve efficiency. Up to now, there is no compressor chart provided, so, what should be the outcome and why would they be better than GTX?

I'm really keen on the results but up to then I think that the GTX are far more superior. After all, Garrett puts a lot of money into R&D and I'm really not sure if someone comparably small like OD is able to keep up with a big company like garrett.

Cheers
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Old 1st September 2016, 08:20 PM   #13 (permalink)
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Theories aside we will see

Unknowns as in getting GTX2860 or 2863 onto a -5 housings. If garret made like for like replacements in billet yes I'm sure they would be superior but they don't.

Also strange why some common billet wheels in a forum members car made more or less the same power as fullrace BW twins. Ok spool but was better on the BW turbos but were they worth the 10k spend?
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Old 2nd September 2016, 06:19 AM   #14 (permalink)
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Ask forced performance see if they will make you some billet wheels
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Old 2nd September 2016, 10:00 AM   #15 (permalink)
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Go to Autosport in Jan..
There were a couple of companies offering billet wheels for pretty much the whole range of turbos...Garrett/KKK/IHI etc

I might even pick one up myself for my GT4094 and see how I get on..


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Old 2nd September 2016, 11:25 AM   #16 (permalink)
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I have a good reliable source for these and can make to any spec.
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Old 2nd September 2016, 12:48 PM   #17 (permalink)
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Ask forced performance see if they will make you some billet wheels
Most people are buying the cheap GTX wheels from Kinguawa and random ebay suppliers and sticking them on the standard -5's with some opening of the compressor housings
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Old 2nd September 2016, 01:03 PM   #18 (permalink)
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may sound stupid but , are you guys getting your turbo balanced after you chance your compressur or exhaust wheel?
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Old 2nd September 2016, 01:21 PM   #19 (permalink)
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may sound stupid but , are you guys getting your turbo balanced after you chance your compressur or exhaust wheel?
It's required as the mass will have changed of the total assembly so a balance is required and a good reputable turbo refurb company would do it as part of th job.
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Old 2nd September 2016, 01:37 PM   #20 (permalink)
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Most people are buying the cheap GTX wheels from Kinguawa and random ebay suppliers and sticking them on the standard -5's with some opening of the compressor housings
Who are you aiming this at?
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