From looking at some turbo maps here http://not2fast.com/turbo/maps/ and using the calculator here http://www.turbofast.com.au/turbomap.html a T3 looks to be a pretty good match for a A20.Originally Posted by gr3k0sLaV
Their applet to automatically choose a turbo does pick the T25 for low boost, but if you do the math by hand the T3 seems to work out better, but then again I haven't ever ran a turbo in my Honda yet, I have just been doing research. My long term project is to build a MegaSquirt (hopefully UltraMegaSquirt) ECU, install a EDIS ignition system, then install a T3 Turbo (moving battery to trunk, and putting it in that area). I currently have an automatic transmission, but I do have a manual sitting around.
I did look at some of the non-garrett turbos, but in general the garretts seems to be the easiest to work with. They seem to be easy to find in junkyards, easy to find flanges for, they have lots of documentation, and lots of people have used them.
Actually, if I remember right, the GT28 map seemed to look the best on paper (no idea how it would work in the real world), but I doubt I will be finding one of those in a junkyard.
(Edited for spelling)
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