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Location:
Canberra
Registered:
August 2002
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1JZGTE turbo wheels? steel or ceramic.
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Wed, 31 March 2004 01:15
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hey guys just a quick question,
did the 1j come with steel or ceramic turbo wheels? ive been told that my turbo wheels are steel, by the previous owner.
and i was just a little curious as to weather it would be an aftermarket job, or standard?
ive also been told that the ceramic turbos have a habit of shitting them selves at around 15psi, im currently running there abouts.
the guy a bought the car off said that he used to boost at around 18 psi... but turned it down a tad so i didnt boost into a gutter or anything...
if someone could shed some light on this id be very greatfull!
oh the car is a JZA70 aero top if that helps.
thanks heaps
chris
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1JZGTE turbo wheels? steel or ceramic.
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Wed, 31 March 2004 01:33
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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.
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Location:
Canberra
Registered:
August 2002
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Re: 1JZGTE turbo wheels? steel or ceramic.
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Wed, 31 March 2004 06:12
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thanks heaps lumpy!
just what the answer i was looking for! 
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Location:
UK
Registered:
May 2002
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Re: 1JZGTE turbo wheels? steel or ceramic.
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Wed, 31 March 2004 10:39
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I wouldnt say swapping them for steels is a common practice, although it is done. I also wouldnt trust the previous owner when he says he had them converted.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1JZGTE turbo wheels? steel or ceramic.
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Thu, 01 April 2004 01:35
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I didn't mean that people commnly replaced them (coz it's not cheap), rather that when replacing it was common to use CT9 turbine wheels.
I wouldn't trust that the wheels are steel either until you've seen them! Nevertheless, not boosting it to 18 psi is a good idea - keep it below 15 until you're sure of what's going on.
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Location:
Newcastle, NSW
Registered:
February 2003
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Re: 1JZGTE turbo wheels? steel or ceramic.
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Thu, 01 April 2004 03:11
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in the jza70 wasnt the aus spec version brought out with ct12b turbos, that have steel wheels, rather then the jap spec with the ct12a turbos with ceramic wheels ??
i have a jzx90 chaser with 2.5inch dump pipes and im running 15-16psi with no dramas.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1JZGTE turbo wheels? steel or ceramic.
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Thu, 01 April 2004 03:35
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There was no Aus spec jza70 - it was never imported here. I think you've got it confused with the jza80 (current supras). They have CT12b turbos and jap spec was ceramic wheels whereas US-spec was steel.
Most people with dump pipes run 15-16psi no dramas. I think it is running that boost pressure with stock dumps increase the chance of failure... but I'm no expert on this.
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