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I recently got my my 1st z32, and one thing I noticed was that it seems to run poorly on 91 octane, sputters and just is much slower to accelerate. but with 93 oct its almost like another car. much better throttle response. so I pulled the floorboard to take a look at the ecu and I found a white tag (that looks rather old) that reads JIM WOLF RACING POP upgrade package A.R.B E.O. #D244 Model Z32FM20T I couldnt find any info on the jwt site, with these #'s. I assume its an older ecu, as most of the upgrades on this car appear to be made 5+ yrs ago. Is it possible it is programed to run on higher octane fuel? thanks
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