Ceramic wheels were standard on the 1jz - but it's common to replace them with steel wheels from a ct9 (starlet) turbo, or various other steel wheel combinations.
There's a lot of argumnets about whether or not the ceramic ones shit themselves at high boost - but apparently many people have been running ceramic wheels with twin dump pipes at 16 psi without failure.
I think at 18psi you'd be getting beyond the efficiency range of the turbos anyway - unless they've been hi-flowed or further modified.
Wed, 31 March 2004 01:33
