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Turbo GT Vert
Topic Started: Nov 7 2016, 09:21 PM (4,434 Views)
91 ragtop
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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.

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Ken...............
Edited by 91 ragtop, Nov 7 2016, 09:55 PM.
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Scoobs
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:D

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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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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:D

91 ragtop
Nov 7 2016, 10:11 PM
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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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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bass heads

Want to make 3 of those manifolds? I'm building my ac plus turbo car :lol
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macuserman
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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! :)
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91 ragtop
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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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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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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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t3ragtop
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Turbo3 and Twincam Tweaker

ken, does that rig clear the upper core support and radiator?
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91 ragtop
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Yuuup !! It's about 1.5'' away from the A/C hose though so I might get it ceramic coated to keep some of the radiant heat down.
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Ken.......
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Stubby79
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wrapping it would do a decent job of keeping the heat down too.
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t3ragtop
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Turbo3 and Twincam Tweaker

the wrap tends to burn out a manifold pretty quickly. i would stay away from it. ;)

i like the ceramic coating. that helps to protect against burn through as well as improving the appearance.

on the a/c line, you can get heat jackets for hose and wiring. i used that on my blue monster turbo3 build with great success. you could also fabricate a heat shield for the hose and that would be very effective. stainless steel has a very low co-efficient of heat transfer and polishing the stainless to increase reflectivity is a good idea as well as being pretty. ;)

you can also get a turbo blanket to reduced emitted heat. any reflective insulative material that interrupts a direct line of sight to another part, like the radiator, reduces heat transmission.

also, i used reflective fatmat on the bottom of the hood because heat from the manifold and turbo tends to cook and dis-color the paint on the top side after a while.

oil cooler, remote oil filter, charge air intercooler, and things like that are important thermal management tools that should be considered as well. ;)
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68custom


nice job on creating those headers. a rebuilt 1.3 twin cam with low boost ought to be good for an easy 200 hp. Intercooler?
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