Quote:
Originally Posted by joshoisasleep
So while we're on the topic... what does A/R stand for?
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A/R describes the geometry of the scroll in the turbine/exhaust and compressor housings.
For a turbine, smaller A/R means it'll spin up faster. If this turbo does have a 0.35 A/R turbine housing then it probably is suitable for your engine.
Often you can get a range of turbine housings for each turbo with different A/R's to tune them for the engine.
For the compressor, don't worry about the A/R. You don't get any options on that side.
To confuse you further.
The old turbo model range had T25's and T28 which was bigger.
The T28 is the same family but has a slightly bigger core so exhaust housings aren't interchangable between the T25 and T28.
The old T25's had model numbers starting with a 4. My T25 is a "455767-0003"
The old T28's had model numbers starting with a 7.
Looks like that GT25 you've been shown is using the T28 size housing which is now used down to the GT20 size. I've got no idea on wheel size and trim though.