Originally Posted by Spooler

Mark and I have had a long conversation about this. E85 will detonate and you won't pick it up on your knock sensor. His recommendation is to only run E85 out of the barrel on high boost for consistency. He has seen many blown up engines that when he takes it apart, he finds detonation traces and then finds out they were on pump E85. Pump E85 is just not consistent enough to risk your engine over. I will stay at 17psi of boost on pump E85.