So I tried it yesterday. Definetely helped my timing! But as other said, why?!?! I dropped back my OL to 75 while letting it auto-ajust, and tried with the same boost as this summer. I did at least 5 logs in 3rd gear and 2 logs 2-3 gears. Timing is really smooth, no drop. Temps were cold, -2 celsius. The only problem now is that with the cold air comes more power, and my clutch began to slip. Before I changed my OL it was at 91 with meth add at 33 and I was still experiencing little drops. Now 45 add, 75 OL, timing is almost perfect. Interresting to say that my trims are still looking good.
Maybe someone with good knowledge can try to explain..??
2008 BMW 335xi MT e90
JB4 G5, WW meth kit, turbonetics intercooler, DCI, UR catted dp's, UR catback, koni yellow + H&R springs, Rieger front bumper, Avant Garde 19" wheels