Turbo GT Vert

91 ragtop
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Joined: February 27th, 2009, 12:46 am

November 8th, 2016, 2:21 am #1

My brother was so impressed with my vert that he wants me to build him one but he wants the full GT treatment along with a turbo. We got a real clean 91 vert and he bought his 92 GT back from the guy that he sold it to last year. I went down to Arizona in Sept. and brought the GT up here to Montana. He said that the vert ""must'' have A/C so I'm in the process of building a A/C compatible turbo setup. I plan on building two of these so I can have one too. I had our local waterjet guy cut me some exhaust flanges and ordered two T25 turbo flanges off E-Bay along with a Chinese turbo. The quality of the turbo kind of surprised me but time will tell if it's worth it. I'm going to run low boost for now so we can run pump gas. From what I've read on Redlinegti.com I should be around 135-145 hp at the wheels with 8 pounds of boost ( stock is about 83) so we'll see how long the tranny lasts. I'm going to build everything in my black GT to start with and get all the bugs worked out before I doo the switcheroo. I got the manifold done today and hope to get it mounted in the car tomorrow so I can start figuring out the intercooler and exhaust. I'll put up pictures as I progress on this project.




Ken...............
Last edited by 91 ragtop on November 8th, 2016, 2:55 am, edited 5 times in total.
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Scoobs
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Joined: June 7th, 2011, 3:39 am

November 8th, 2016, 3:00 am #2

This is on my list of wishes for the toaster, a turbo :D Is that gt motor built in any way? or stock? How much boost could it hold before failure?
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91 ragtop
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Joined: February 27th, 2009, 12:46 am

November 8th, 2016, 3:11 am #3

That's just a 8 valve block with the GT head on it so I could build the manifold. The GTs that I have are stock . One has 140,000 miles and the other has 200,000 miles on it. I'm not going to worry about big boost right now. I just want to have something with some reliable power.


Ken..........
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Scoobs
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Joined: June 7th, 2011, 3:39 am

November 8th, 2016, 3:24 am #4

91 ragtop wrote:That's just a 8 valve block with the GT head on it so I could build the manifold. The GTs that I have are stock . One has 140,000 miles and the other has 200,000 miles on it. I'm not going to worry about big boost right now. I just want to have something with some reliable power.


Ken..........
Im not wanting to run crazy boost either, i just want a little more Umph to play around town with. Plus adds wow factor to the engine bay.
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solerpower
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Joined: May 18th, 2011, 9:54 pm

November 8th, 2016, 5:37 am #5

The stock g13b is 100 hp. What turbo is it? The t25 flange is a smaller flange, and smaller turbos. However wiith 8 psi depending on your downpipe/ exhaust system, and intercooler setup you should be able to easily pull down your 145 hp. Looking forward to seeing more of your build.
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ZXTjato
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Joined: February 8th, 2012, 11:53 pm

November 8th, 2016, 8:49 pm #6

Want to make 3 of those manifolds? I'm building my ac plus turbo car :lol
Technological Disobedience
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macuserman
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Joined: March 29th, 2012, 2:42 am

November 8th, 2016, 10:25 pm #7

Following this, AC is the one reason why I haven't gotten excited about a Turbo. Call me a pansy, not a true gear head, car guy whatever. But I need me some AC! :)
Admin of the SuzukiSwiftRepository, as well as a GTi fanatic! Currently own a Red 89 GTi undergoing a full restoration and a Black 93 GT .
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91 ragtop
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Joined: February 27th, 2009, 12:46 am

November 9th, 2016, 2:07 am #8

I'm going to build another one this weekend while everything is still fresh in my mind. We'll see how this setup works for now. I might be talked into building a couple extras. I took my Garrett T25 and put it on the mount that I built and the manifold bolted right up to it and the head so the Chinese copy is pretty close.
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solerpower
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Joined: May 18th, 2011, 9:54 pm

November 9th, 2016, 5:17 am #9

In my search for Garrett t25 there are 3 different ones. All with the same turbine, but different cold side wheels. "There are three models of T25 Turbos: the GT2554R-471171-3, the GT2560R-466541-1 and the GT2560R-466541-4.

Compressor Dimensions
The GT2554R-471171-3 compressor has an inducer of 42 mm and an exducer of 54.3 mm. The "inducer" is where flow enters a wheel, which, for a compressor, means it is the "minor" diameter, and the exducer is the "major" diameter. This is reversed for the turbine wheel. The compressor has a "trim," or ratio between the areas of the inducer and exducer, of 60. The area/radius, or "A/R," which is a geometric relationship between different parts of the turbo housing, is 0.80. The GT2560R-466541-1 and the GT2560R- 466541-4 have an inducer of 46.5 mm and an exducer of 60.0 mm, with a 60 trim and a 0.6 A/R.

Turbine Dimensions
The turbine for all models of the T25 has a 41.7 mm exducer and a 53 mm inducer with a 62 trim and an A/R of 0.64.". I also found a couple compressor maps. Which leads me to believe there is actually more than 3. I was going to try to match up the cfm for g13b with the turbo to get an estimate of where to run the turbo at. Just by looking at the turbine which should be the same it will fit a decent rev range.
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91 ragtop
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Joined: February 27th, 2009, 12:46 am

November 9th, 2016, 5:51 am #10

This is a T copy not a GT copy. The AR is .48 and .49 This is journal bearing vs ball bearing that's in the GT25. I run a GT2560 in my Yamaha snowmobile and that AR is .60 and .64.


Ken........
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