i cannot remember where exactly i read this but somewhere in the paperwork/manual for my svt i read that you should always run 91 as a minimum but if for some reason you did run 89 or 87 the computer would alter the timimg or something like that so as to prevent detonation

00 black/tan svt, #2052 of 2150, born 2/1/00 formerly known as my csvt "Nothing in the world is more dangerous than a sincere ignorance and conscientious stupidity." -Martin Luther King, Jr.