|
Yeah, the O2 sensors looked okay but I'm going to recheck/replace them anyway. Sal seems to think it's a dme/tune issue since bad O2 sensors would cause other drivability problems. (Doesn't the car run open loop at WOT anyway?)
It's weird that even with the same tune, the difference pre and post headers is so dramatic. One theory the dyno guy brought up is that some headers can cause a pinging sound which the knock sensors pick up and misinterpret as pinging causing the dme to pull timing. Seems unlikely though since other M3 owners have reported solid results with the SGT headers....
|