rb20 hesitation

[minor_times]

So today I installed a mbc and played with the boost levels. When I got it set to ~10psi I accelerated at wot and got hesitation and a rapid backfire(ish) sound from the exhaust once full boost ~12psi was achieved. I then brought boost back down to 8-9psi and it ran just fine. Im guessing this is either a fuel or spark plug issue, correct me if im wrong.

stock smic
t28
safc2 (untuned)

[Couped_up'd]

Lower the spark plug gap to around .8

(My freinds rb20det did this SAME thing)

If that does not fix it, then I would look into the coil packs.

[minor_times]

word, thanks :D

[Zacho]

NGK BKR7E plugs are money for >10 psi on an rb20/25 from my experience. Pre gapped to .8, and not bad price.

[eklips3]

yep , i had this on my car exact same symptoms.
like the previous posts , check your plugs , play with your gap, i had to tinker with my gap a few times to get it bang on ... i wish i wrote it down somwhere cause i threw the plugs out. but even after that my car still hesitated a bit so i got new coil packs and smooth quick sailing from there

[Couped_up'd]

I did the Gm coil pack convertion. Love it!