Quote:
Originally Posted by josiahg52
The values are calculated but there is a DPF pressure sensor and that's an input to the calculation. The pressure signal varies depending on engine load and exhaust volume. The design DPF load is over 100g. I have 172,000 miles on my X5 with that 67g of soot. No leaks, still gets 30+ mpg calculated Go out and drive your X5 for about an hour at normal operating engine temperature (>75C, IIRC) above 40 mph. The longer and faster the better. Order a regeneration if you like.
Yeah, over 600F at the turbo outlet should be sufficient to get the DPF temperature over 1000F during an actual regeneration. Much more frequent "passive" regeneration takes place at much lower temperatures.
Monitor the throttle position sensor (TPS) and engine coolant temperature. The TPS usually stays open at 94% during normal operation and may open to 99% or shut slightly under some extremely brief, transitory engine operating conditions. During regeneration, it will vary from around 10% to about 30% but will open up to any value up to 94% depending on some transient conditions. Coolant temperature should increase to the low to mid-90F ranges.
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Thanks for the explanation, it's good to know about the TPS sensor. I'm just about to go and get my EGR Thermostat from BMW and install it later. I'll then monitor
Coolant temp
Exhaust temp
Throttle position sensor
And back out every now and again to view the DPF soot and Ash values.
It will be good to see a regeneration but also scary because that smoke I seen before was pretty scary and I hope not to see that again lol but as I tested yesterday, a few WOT pulls and 10 mins of 300/350, exhaust temps resulted in no smoke so if I do see 600 I might pull over to see if there's any crazy smoking and if all looks well ill drive to Blackpool which is a good 2 and a half to 3 hour drive and hopefully the soot will be down and the ridiculous 1000 backpressure reading will be back to normal.. Still concerns me with that backpressure, at what point does the backpressure strain the turbo seals/rear main etc?