turbo size

[ice-_-]

is the 1.5 able to spool a t3/t4 turbo

[Parmas]

A T28 spools about 3500rpm on a 1NZFE so I think if you intend high revs a T4 will be above 4000rpm.

The main problem is more where to put a T4 turbo in a yaris engine bay!

[cali yaris]

too big for the Yaris, unless you're going for huge power and very high powerband (like for drag racing only). There will be considerable lag with that turbo.

[severous01]

why not retrofit an eclipse turbo? they're cheap on ebay, like 50 bux rebuilt.

[Parmas]

Stick with a T28 these are commonly enough for a 1NZ

[yarr_is]

go big... or go home.