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[Doc Zaius]

First off, I'm a turbo n00b... I only know what I've read and researched online. That being said, I have a feeling the GT25 will be too big. I've been looking into either a GT20 or GT17-sized turbo for the Yaris. Since our engines are only 1.5L, and redline @ 6,300-6,500 RPM, they can't flow too much air. The length of time needed to spool a GT25 up would mean it wouldn't be very streetable... i.e. slow response. Also, I think with this size of compressor, you'd possibly be operating near surge at lower RPM.

Anyhow... I don't know about the K03. I'll have to read about that. But ya, if you can find the compression map or specs for either or both of the turbos, some of the more experienced members here would be able to give you some solid advice!

[Tamago]

Originally Posted by Doc Zaius

First off, I'm a turbo n00b... I only know what I've read and researched online. That being said, I have a feeling the GT25 will be too big. I've been looking into either a GT20 or GT17-sized turbo for the Yaris. Since our engines are only 1.5L, and redline @ 6,300-6,500 RPM, they can't flow too much air. The length of time needed to spool a GT25 up would mean it wouldn't be very streetable... i.e. slow response. Also, I think with this size of compressor, you'd possibly be operating near surge at lower RPM.

Anyhow... I don't know about the K03. I'll have to read about that. But ya, if you can find the compression map or specs for either or both of the turbos, some of the more experienced members here would be able to give you some solid advice!

i'm running at TD04 14G from a 2.0L subaru Legacy GT and i have full boost by 3500rpm.. that's plenty early