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ok, I am about to do a 1jz auto swap into a s13 240sx. My question is does the 1jz auto computer control the shifting or does another ecu do that?
 

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Depends what car the 1JZ came out of. If it was a MK3 supra, no. If it was a Soarer or chaser, yes.

If all else fails, spend the $350 for the latent solutions stand alone transmission ECU. I run one on my car. Still working out the bugs and getting it tuned, but its a very good unit. Fully programable shift tables, or u can goto "manual" mode and paddle shift with whatever u want to hook up to it (i use my cruise control joystick)

If your really cheap, u can just control the shifting with 3 toggle switches from discount auto parts :)
 
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