In Reply to: Powerband posted by peter on August 12, 1999 at 17:38:10:
Ken--GO FOR IT. Send in the graphs showing the loss. There are MANY posts backing this loss in 540-6.
I still think it is a quick timing retard that takes a bit to clear. Maybe a knock sensor thinks there is a knock and backs off the timing. I had bad cats on a car once and the car bogged down at higher rpm ALL THE TIME, it was not intermittant.
I complained to BMW-NA by e-mail about this problem with my early 98 540-6. Sent them post after post about others that experience it. They had the local dealer call me and say it knew nothing about it and not to believe all you read on the net. They denied they had EVER heard such a claim on the model. I pointed out to the dealer that I had complained about this when the car was 2 months old and now found many others with the same phantom problem. They found no fault codes and said it was normal.
I Put in the DINAN chip (flash)---The intermitant power loss is STILL there. Ken posted a graph showing the drop on a 540 with Dinan Cold Air and chip too. I may just get an E-55 cuz there is NO support from BMW on this or maybe the Soon-2-come (sure it is) conforti flash will solve this.
: I was just wondering if everyone see the big powerband HP/Torque loss from 4k to 5k rpm.
: It is alsmost sombody is hitting the brakes. My 540i 6sp has 18k miles now.
: Anbody played with chips and cold air intake, did this problem go away.I have heard the power band is not nice and flat, would like to make it that way.