Quote:
Originally Posted by hotrod182
I'm going through the same performance issues right now. Good performance one run, and then a week later, the engine feels suffocated. I don't do much open highway driving. Does anyone know a way to force the DPF regeneration before you go to the drag strip, etc? My exhaust tips are now covered in black soot. The first 2 yrs they were clean.
I thought this all started happening since my EGR recall, but that could be a coincidence, as the DME faults are for excess exhaust pressure, and the dealership test plan calls for regeneration commands to be initiated, then retesting. So yes, right after regeneration, the back pressure is okay, but then performance deteriorates from then.
I'm wondering if this is just a factor of a worn DPF? Or did the EGR recall have any effect on this.
I did some testing this last weekend, performance was okay to get in the 12's with traction, but considering I was running K1 with drag radials, and seats removed, it should have been faster. (car ran over 108mph with more weight when it was new!) But in the same configuration with the back pressure issues, my trap speed would be down to 99mph! That is like a 70hp handicap! And basically what the car would run stock without the JBD.
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I haven't tried to use the BT to force a regen, but it can show you all kinds of data on what's going on with your DPF.
http://www.bimmerfest.com/forums/sho...5&postcount=21
http://www.bimmerfest.com/forums/sho...4&postcount=22
http://www.bimmerfest.com/forums/sho...8&postcount=23
Wonder if the algorithm that tracks the loading on your DPF is out of sync with how much ash has actually accumulated? The more the DPF loads with ash the less room it has to hold soot ... I've been tracking the backpressure and loading of my DPF for awhile now and it had seemed like it was aging gracefully. But if you are triggering backpressure faults ... that is troublesome for the condition of your DPF.