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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-21-2010, 04:57 PM   #1
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Smile Garrett VTN for MIATA 1.6, 1.8 or 2.0

This has to have been Miata done before. My search technique is prolly bad. That said feel free to educate me on search tech.
Anyway, who is running the above. I think for my ap that is what I want to do.
Any positive direction would be greatly appreciated.
Thanks to all, Luigi.

Last edited by luigi; 02-21-2010 at 04:58 PM. Reason: Poor punctuation.
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Old 02-21-2010, 06:28 PM   #2
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Pretty much any VTN turbo you will find is from a diesel and the mechanisms get fried by the hotter egt of a gasoline engine. The only gasoline engine with VNT that comes to mind is a porsche 911 turbo.
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Old 02-21-2010, 07:13 PM   #3
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Default Ladies and gentlemen; start your flame throwers

I have read the same. However aren't those turbs placed ''down stream''? I am prolly wrong on that as I have no idea where ''down stream'' is on a 911would be.
There's just got to be a better (simpler) way. Yes VTN mechanism is in itself more complex but greatly reduces the overall number of bits and pieces needed.
I know this has been hashed and rehashed a thousand times before.

However.

I am going ahead with an already fubared plan with an Aerodyne. Yeah. yeah, I have read at least most of the horror stories. I am going headlong into this project with the build in anticipation of moving on to a GT 2554R or something similar when the grenade hits.

Until then I would ask for any truly constructive criticism you might offer.
Thanks for your support, Luigi.
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Old 02-21-2010, 07:25 PM   #4
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I've found gt2559v turbos on ebay for fairly cheap, but yeah, don't think that's gonna go over to well on a gasoline engine.
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Old 02-21-2010, 07:32 PM   #5
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Sorry but your last post made very little sense.

Are you using a VNT an Aerodyne or a gt2554r?

VTN is more complex so how does it reduce the overall number of bits required?

and WTF do you mean by a "downstream" turbo?

Perplexedly yours

Tom
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Old 02-21-2010, 08:18 PM   #6
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Must be the language diff Tom. I reread my post and it made perfect sense to me............
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Old 02-22-2010, 01:14 AM   #7
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Quote:
Originally Posted by luigi View Post
I have read the same. However aren't those turbs placed ''down stream''? I am prolly wrong on that as I have no idea where ''down stream'' is on a 911would be.
There's just got to be a better (simpler) way. Yes VTN mechanism is in itself more complex but greatly reduces the overall number of bits and pieces needed.
I know this has been hashed and rehashed a thousand times before.

However.

I am going ahead with an already fubared plan with an Aerodyne. Yeah. yeah, I have read at least most of the horror stories. I am going headlong into this project with the build in anticipation of moving on to a GT 2554R or something similar when the grenade hits.

Until then I would ask for any truly constructive criticism you might offer.
Thanks for your support, Luigi.
Unless someone gives you a working Aerodyne with turbo manifold & downpipe, I'd suggest NOT taking that route. Only one guy in the country that I'm aware of can rebuild it if you have problems (Gerhard at Aerodyne of Dallas) and the rebuild will cost you as much as a new BB Garrett.

Even if you only plan on running the Aerodyne until it grenades, the Aerodyne has a slightly different exhaust manifold flange than a T25/T28 and also has a completely different downpipe connection. Changing out to a 25/28 series turbo will require re-machining of the turbo mounting flange on the manifold as well as welding a new "head" on the downpipe.

The Aerodyne has some pluses (if it holds up):
I get 8lbs of boost by 2,200 RPM
Self contained oiling system so no oil lines or coolant lines to run
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Old 02-22-2010, 04:08 AM   #8
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Quote:
Originally Posted by luigi View Post
Must be the language diff Tom. I reread my post and it made perfect sense to me............

Answer the questions from my last post and maybe I can offer some advice.

I'll be entirely honest and say that unless you are a very good mechanic and know exactly what you are doing or some one who doesn't mind their car being off the road more than on then you would be wise not to stray too far from the beaten miataturbo.net path. People here get good results built on the experience of the whole forum. Learn from others mistakes and profit.
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