Originally Posted by Gugs
The answer is-
Your overboosting or knocking.
With the newer firmwares we have new features...
The Jb4 goes into safety mode and forces itself into map 4 until you restart the car.
look for flashing check engine lights right before it happens, 1 flash is overboost and several is knock.
This is exactly what is happening-
as its defaulting to map 4 and leaving you to OEM map/boost levels.
Put in less e85 and it will most likely help the issue.
Spot on...seen it before with my buddies car...
JB4 G5, WEDGE flash, 455 LPFP, HFS-4 meth kit, BMS OCC, RB turbos W/3.5 N20 sensor, RB valve, BMS DCI, 3" AR Dps, Custom OC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, Meyle HD tie-rods, HPA rear toe arms, Wavetrac LSD, DEFIV kit, KW clubsport coilovers, Power-Flex subframe bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, MORR VS8.2 rims 245/295