The car is a 2010 E92 xdrive automatic with a 6hp19z per my local BMW dealer. Turbos are RB Next Gen Plus with hardware in place to support them. Fueling is a new(ish) HPFH, fuel-it stage 3 LPFP, MMP port injection & full e85. XHP stage 2 flash for the tranny.
I've been slowly turning up the power with my tuner (Wedge), and last week noticed the car "pulsing" during a 3rd gear logging pull. Initially I thought it might be tune related, however the logs look smooth as silk. What I feel while accelerating can probably be best describe as the throttle plate closing and opening a bit, every second or two. The logs tell me that's not occurring.
This is probably a bit vague, but I'm not a drivetrain guy by any stretch of the imagination - and this is my first automatic. If an automatic tranny starts slipping, will it act similar to a manual clutch slippping? I believe the tranny locks up somewhere along the line to take some of the load off the torque converter.
Any AWD guys care to chime in with anything even remotely related? I'm pretty pleased with the power being made, but am a bit gunshy about using it. Haven't dyno'ed or taken it to the track yet, virtual dyno says mid 500's hp and just over 600 tq - probably pissing the tranny off a bit. No transmission cooler yet, either.
I've been slowly turning up the power with my tuner (Wedge), and last week noticed the car "pulsing" during a 3rd gear logging pull. Initially I thought it might be tune related, however the logs look smooth as silk. What I feel while accelerating can probably be best describe as the throttle plate closing and opening a bit, every second or two. The logs tell me that's not occurring.
This is probably a bit vague, but I'm not a drivetrain guy by any stretch of the imagination - and this is my first automatic. If an automatic tranny starts slipping, will it act similar to a manual clutch slippping? I believe the tranny locks up somewhere along the line to take some of the load off the torque converter.
Any AWD guys care to chime in with anything even remotely related? I'm pretty pleased with the power being made, but am a bit gunshy about using it. Haven't dyno'ed or taken it to the track yet, virtual dyno says mid 500's hp and just over 600 tq - probably pissing the tranny off a bit. No transmission cooler yet, either.