I’ll let you know here in about 7 months because that’s exactly what I’m doing. Keep in mind, it’s a very expensive process. The 1zz is not designed to handle a lot of power, so the engine internals have to all be upgraded. Piston heads, rods, new studs, turned crank and more. My mechanic has quoted me $3,000 just to upgrade the engine to be able to handle a turbo kit. All in all, estimates range from $7,000 and up in order to turbo the 1zz.
Is it worth it? I think it is. The 1zz motor is known for its reliability and durability. I want that reliability, but it just needs a bit more power for my taste. One important thing I’ve learned from reading posts and interacting with people is that you absolutely will need to find someone who can tune your car properly to handle the boost. And even then there is still risk, as with almost any motor.