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I have heard of people successfully running a 20v on 16v electronics of one sort or another. Two big issues:
1. 20v injectors are sized for sequential injection vs 16v batch injection which fire in pairs. You would need smaller sidefeed injectors otherwise you would run quite rich.
2. The only way to trigger vvt is with the tvis trigger. It's on and off at 4500rpms. The 20v vvt needs to be triggered at full throttle. It's more throttle based than rpm based.
These two issues assume that the 20v cam angle sensor can send an acceptable signal to the 16v ecu.
I have also heard of people getting the 20v running on the 4afe ecu.
you'd still have to do extensive modification to the 16v engine wiring harness to fit the 20v, so using a 16v ecu wouldn't save any wiring trouble.
From a cost standpoint, there is no good reason to use anything but a 20v ecu. You can purchase silvertop ecu's for around $100, and all the supporting electronics can be purchased for another $100 or so (coil, igniter, afm, o2). There would still be things to buy if you used a 16v or other toyota ecu.
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