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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 08-06-2008, 04:12 AM   #21
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thanks guys 4 the help
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Old 08-06-2008, 10:09 AM   #22
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Quote:
Originally Posted by paNX2K&SE-R View Post
I'm sure the SR t25 is a fantastic turbo for a Miata engine, they spool fast, can be rebuilt if needed, and they make pretty good power. As mentioned above they are also easy to find at dirt cheap prices.
I thought they were too small..."even for a miata"

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Old 08-06-2008, 11:44 AM   #23
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Quote:
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I thought they were too small..."even for a miata"


HUH? When did I ever say that an SR t25 was too small for a Miata???
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Old 08-06-2008, 12:06 PM   #24
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Originally Posted by paNX2K&SE-R View Post
HUH? When did I ever say that an SR t25 was too small for a Miata???

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Two: Skyline T28 turbos are going to be a little bit small. Also see #1.
if a t28 is small, what would make a sr t25 better suited?



the wheel on a T28 looks mighty big in comparison. But wait, that picture is labeled T3 50 trim! Well, as you should know, a T28 wheel is a t3 wheel. As T25 + T3 = T28. While still sharing the same standard T25 turbine.
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Old 08-06-2008, 03:27 PM   #25
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If someone put down skyline t28 (.42/.48) next to an SR t25 (.80/.64) and made me pick, I'd take the t25 every time. I maintain my position that an RB20 t28 is too small when there are better options for the same price. Now if we were talking about an S14/S15 t28 or a GTi-R t28 (what I run) thats a completely different ball of wax.
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Old 08-06-2008, 03:56 PM   #26
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But doesn't the skyline turbo have a T3 footprint? .48 in T3 = .64 in T25

Since A/R is defined as: the inlet cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. And we all know a T3 inlet is much larger than a T25, so the numbers are not directly comparable.

And even if that is not the case, buy a sr20 turbine housing and put the t28 in it

So, I maintain my position, that the turbine is the same, and the compressor wheel is a T3 wheel. Which makes the T28 a larger turbo with better potential.
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Old 08-06-2008, 09:46 PM   #27
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Alright I guess its probably silly to debate this without access to compressor maps and/or same car same dyno comparison numbers anyway.
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Old 08-07-2008, 10:16 AM   #28
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do you want me to post the compressor maps? Was my picture of the two wheels not enough?
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Old 08-07-2008, 02:59 PM   #29
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Actually I'd prefer if you would dyno your car with both setups back to back just to be sure. j/k
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