Ok let me clear things up a bit, if you had and up rev tune done by a real tuner, means he adjusted ur a/f ratio on a/f targets and timing and so on, you will not have this delay. If you just installed a rom by ur self w/o a tuner person correction, you will have that stock delay(if u never adjusted it). If you never had the tune you will have that low rpm delay. I personally noticed that an up rev rom (back to stock) has more lag than the original nissan programming(stock) this due to a/f ratio is 14.7 till ~3k rpm also at WOT it hits 11.7 a/f ratio cuz if u put wrong fuel it wont do too much engine damage.
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