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The hearsay is that it's tougher to tun an actual rb ecu if you keep the variable cam timing, the 8-bit z32 ecu being the easiest option, but by no means the most effective or fine grained
Matt developed nistune for all the rb ecus, so they do have plenty of experience tuning them in aussieland -- guess it's also a matter of availabilty, north america got most of the z32
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