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Here's what i know;
the 1jz-gte was a 2.5L twin turbo (280hp i think) it was a replacement for the 7m engine in 1989. I don't know if it was the only engine available after 89 or if japanese consumers had the choice of the 1j & the 7m.
The 1j is a predecessor to the 2j-gte that is in the mkiv supra.
The 7m-gte is a 3.0L turbo or NA motor.
The 1J was never available in north america but since it puts out more than the 7M stock people use it because of it's reliability because they don't know how to maintenance their 7m's properly.
I don't know if this is true but i think the 7m is capable of more hp because of the displacement .
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