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It
really depends on how much power you want to make & how much lag you will
accept.
A T25
will give good response, but will be limited in power output and you won't want
to go over 10psi with no intercooler or 15psi with intercooler.
T28
will be a smidge laggier, but if you get a ballbearing one then that will offset
the lagginess and give you good response like a T25 without the flow
restrictions.
The
exhaust side A/R in real basic terms is this: The bigger the number the laggier
it'll be, but with the benefit of more overall flow.
.48 is
small and will choke it'self up in the high RPM range.
.64 is
a nice middle size for 1.8 to 2lt engines.
.8 is
getting on the big side of things. Probably not necessary unless you start
putting on big compressor housings and stuff.
There
are some real nice turbos and options in the T2x range, so you don't need to
really go changing to T3 flange unless you have to.
What
i've found is that if you can switch up to T3 series of turbos
(change the flange on your manifold), there are some really nice options
available such as T3/4 hybrids that are dirt cheap and produce some sickening
amounts of power, not necessarily laggy either.
I
bought a T3/4 for my SR20det and it is running on 18psi, making some really
scary horsepower. On stock boost it made 215hp @ the wheels while I was running
the engine in. It's now run in and 18psi is just a whole new dimension that I
haven't experienced previously. It's fast, and will bag up the tyres in 4th gear
@ 140ish km/h. I haven't dyno'd it at this boost level yet. For the record, the
exhaust side is .48 T3 housing which *I Think* equals something larger in the
T2x series like .6 to .8 ish. I might be wrong about that part tho.
A
turbo'd L 18-20 engine with similar turbo configuration could do the same sorts
of things. The T2x series of turbos are quite sufficient though in most setups,
so don't take me too literally. I just went to T3 coz I had one sitting around,
and then found a bigger & badder one very cheap when the small one blew up.
If you can, grab yourself a disco-potato GT25RS and you will be set. These are
apparantly the ducks guts of ballbearing T2x turbos.
I LOVE
turbos. Cheap thrills to be had!!!
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