Would like to clarify something here. I had the impression that all non vvti 1JZ were the same. Same power steering pump, ac compressor, alternator, etc well, not the water pump, but anyway.

Upon removing my ac pump from my mx83/jzx81 1jz, I found that the ac pump pulley was a slightly larger diameter than my replacement ac pump from a z30. I also had a a70 pump lying around and it was the same size as the z30 pump. Why does the x81 pump have a larger pulley?

I was thinking that the smaller pulley might still work, because won't any slack on the belt be tightened up by the belt tensioner? Is this a fair assumption?

Does the soarer and supra use a different drive belt to that of the chaser?

I have a pic below to show the different sizes; left is x81 right is z30/a70.