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Old 10-03-2012, 01:58 AM   #1
jacky599r
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Default Got a authentic Garrett Disco Potato, what should i do with it?

Hi,

My engine just gave up on me and I'm looking at rebuild the car. A friend of mine is kind enough to give me his Garrett turbo (Disco Potato). However, i understand the flange is different to a subbie. Is there a way around it? What are the alternatives, if any, or i swapping out the hot side is the only way?

Yours,
Jacky
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Old 10-03-2012, 02:01 AM   #2
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Go rotated, thats youre option.
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Old 10-03-2012, 02:17 AM   #3
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Yeah, go rotated with an exhaust flange smaller than any of the off-the shelf rotated kits. You're looking at paying someone to fabricate a custom uppipe / downpipe if you want to use that turbo.
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Old 10-03-2012, 02:31 AM   #4
jacky599r
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Hi, thank you for the responses!

It is a pity the regulations are pretty strict back here in Singapore...so, getting custom exhaust work is pretty much out of the question. Besides, i have got a stock location CAI and turbo inlets. Should changing the hotside a simpler choice? What are the drawbacks?
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Old 10-03-2012, 03:09 AM   #5
UK-Wagon
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Quote:
Originally Posted by jacky599r View Post
Should changing the hotside a simpler choice? What are the drawbacks?
It cant be done with that turbo to mount in the stock location. It has to be custom. Thats the only way
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Old 10-03-2012, 09:25 AM   #6
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Sell it and buy a turbo that will work.
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Old 10-03-2012, 09:51 AM   #7
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Originally Posted by s2ktosti View Post
Sell it and buy a turbo that will work.
and that is that
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Old 10-03-2012, 05:21 PM   #8
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Quote:
Originally Posted by jacky599r View Post
Should changing the hotside a simpler choice? What are the drawbacks?
The main drawback here is that what you want is not readily available for purchase.

I suppose you can see if ATP or Blouch will sell one of their hotsides seperately, but I doubt they would.

The realistic solutions are to go rotated with custom fabbed pipes or use a different turbo. There are no off-the shelf solutions for a Disco potato, because that turbo is quite small and comparable to the significantly less expensive route of buying a used STi turbo and bolting it on without any fuss.
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Old 10-03-2012, 05:27 PM   #9
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I've always wanted to stick a larger gt28r on a STI just to see how it works out. I feel like it drive like a VF39 on steroids. Shouldn't be any worse than a vf39 anywhere and should be able to pump out a bit more power. For me ideally I'd love to have a fat powerband with about 350whp and the VF39 just won't get me there on pump gas. I have no desire to run anything but pump either.
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Old 10-19-2012, 06:57 AM   #10
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thanks guys
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Old 10-19-2012, 07:57 AM   #11
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Quote:
Originally Posted by jacky599r View Post
Hi, thank you for the responses!

It is a pity the regulations are pretty strict back here in Singapore...so, getting custom exhaust work is pretty much out of the question. Besides, i have got a stock location CAI and turbo inlets. Should changing the hotside a simpler choice? What are the drawbacks?
get some flanges a welder and some pipe and do it yourself. it's not rocket science it's pipes.
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Old 10-19-2012, 10:56 AM   #12
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Quote:
Originally Posted by sjs0433 View Post
I've always wanted to stick a larger gt28r on a STI just to see how it works out. I feel like it drive like a VF39 on steroids. Shouldn't be any worse than a vf39 anywhere and should be able to pump out a bit more power. For me ideally I'd love to have a fat powerband with about 350whp and the VF39 just won't get me there on pump gas. I have no desire to run anything but pump either.
This is exactly why the blouch dominator series was created lol. The dom 1.5 and 2.5 are both GT28 center sections.
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Old 10-19-2012, 04:01 PM   #13
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Get this done...
http://www.ebay.com/itm/GT2860R-UPGR...sories&vxp=mtr

Then buy one of these and an upipe with ewg...
http://www.ebay.com/itm/GT2871R-7cmT...sories&vxp=mtr

For your reference, this was my 2.0 with a rotated disco potato, hydra and manual boost controller at 20 psi... Power band was great.



gt3071r with wg turbine wheel on 2.0, the turbine wheel was slightly bigger than the 2871r wheel 56.5mm instead of 54mm, not a full size 3071r wheel, 60mm. Car was a '00 RS with 2 people in it, virtual dyno was modified for the RS.


Last edited by theotherguy; 10-19-2012 at 04:33 PM.
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Old 10-19-2012, 05:57 PM   #14
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Quote:
Originally Posted by mattminer View Post
This is exactly why the blouch dominator series was created lol. The dom 1.5 and 2.5 are both GT28 center sections.
3071r centers, not GT28 centers. Blouch sells a subaru flanged GT28 and they probably sell like one every couple years because of it's price vs. a 16G.
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Old 10-19-2012, 07:19 PM   #15
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Quote:
Originally Posted by jacky599r View Post
It is a pity the regulations are pretty strict back here in Singapore...so, getting custom exhaust work is pretty much out of the question.
Quote:
Originally Posted by tunertype View Post
get some flanges a welder and some pipe and do it yourself. it's not rocket science it's pipes.
reading, it's fundamental.
or, perhaps it's more rocket sciencey than pipes.
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Old 10-20-2012, 11:22 AM   #16
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You can get a 7cm subaru turbine housing for a gt28 for $165 and a wastegate actuator from Kinugawa. Running a gt28rs on a 2.5 is another subject...
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Old 10-21-2012, 12:25 AM   #17
jacky599r
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Quote:
Originally Posted by theotherguy
You can get a 7cm subaru turbine housing for a gt28 for $165 and a wastegate actuator from Kinugawa. Running a gt28rs on a 2.5 is another subject...
Thanks man, more or less what I'm looking for. Do they have a bigger hot side? Ive previously read that 7cms are too small for the 2.5s. I'll heed your advice with the upgrade. I cannot touch the exhaust pipings due to strict laws - could get a jail term for it.

Since it would be a DD street car, I believe he Turbo should serve this purpose well. I'm thinking of bolting a 6 speed too
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Old 10-21-2012, 11:05 AM   #18
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I haven't been able to find an 8cm^2 turbine housing for a gt turbo. I asked the vendor and they said that they were not available. Many have used the 7cm on a 2.5 but I don't know if it is optimal. With the the relatively small turbine wheel on the gt28 (47/53.9) it may help get it spooled up quickly, a little port work on the turbine housing may help. Since you are getting it free, it may be worth it to experiment. After the 56 trim/ 71 wheel upgrade, it may be like a super fast spooling td05-20g.
Is your compressor housing 3"? Do the Singapore models have TGV's? May be another problem for you.
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Old 10-21-2012, 01:03 PM   #19
jacky599r
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Hey,
Yeah, it appears the 7cm is more bad than good for the 2.5. What do i need to look out for to get a hotside to work? Im pondering if i should send it for balancing...Oh well, the inlet is 2.4 and we do have TGVs...
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