|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
95 PSI DPF pressure even with ABC Delete....
|
|
11-29-2016, 09:01 AM | #1 |
Major
244
Rep 1,293
Posts |
95 PSI DPF pressure even with ABC Delete....
So now that I got you in here reading....let me explain.
My car has a full ABC delete after a failed attempt at running an emissions compliant tune (saga began a year ago and not the purpose of this note). As a result my DPF clogged up. The car is now properly tuned for a ABC delete, the DPF differential pressure sensor has been disconnected and removed. Yet the DDE is still reporting a static 95 psi DPF pressure when monitor the cars parameters. It behaved the same previously when the sensor was connected but hoses routed in a U. This seems odd. When such high pressures are measured such as when my DPF clogged, does the DDE record this as a hard fault of some kind? Using Carly, I have zero stored codes. If so, does this have any impact on the cars operating conditions? Could the DDE still hunt for mommy and try to perform a regen with this parameter set? |
11-29-2016, 09:21 AM | #2 |
Second Lieutenant
24
Rep 234
Posts |
I am far from an expert but let me take some guesses. I have a BPC II+ tune. My hoses are just there; I assume the installer of my downpipe just loosely tied them up like my asked. I suspect BPC tunes out the regen cycle and ignores the data coming from the differential pressure sensor.
Does your car run like it's supposed to? |
Appreciate
0
|
11-29-2016, 12:02 PM | #3 |
Colonel
870
Rep 2,611
Posts |
I bet the value of that sensor is simply ignored. Will be happy to check my values when I get back from holidays. For example, I recall Post SCR NOx value is reported as a constant 2000ppm. I've sent my DDE for an update. Some values may be different.
|
Appreciate
0
|
11-29-2016, 01:10 PM | #4 |
Brigadier General
770
Rep 3,555
Posts |
Mark, what is the Carly parameter you need us to look at. I have a list of the 52 that Carly can pull. There are 2 that look to do this
1) differential pressure measured by the particulate filter 2) differential pressure of the particulate I've been running with the black tubes hanging down and not even the U pipe between them for 1.5 yr. The ecotune pipe did have the pressure tubes and I ran with black tubes connected up until middle of 2015. After that, the tubes were cut off and the nubs welded over. I'm now running a gutted DPF with same tubes cut off and welded over. So, my data is likely going to just say 0 differential. |
Appreciate
0
|
11-29-2016, 01:29 PM | #5 |
Major
244
Rep 1,293
Posts |
I am using the PID parameter below that DWR has graciously supplied us a while back.
0-0 BMW 335d DPF Pressure,DPF Press,17A,((B*256)+C)*0.00146959,0,5,psi,Auto My uneducated theory, is that when the DPF clogged up, it somehow set a permanent fault which is storing this very high value. Even after ABC delete, this PID is reporting the same thing with or without the sensor hooked up. Yet I have 'No Codes'. |
Appreciate
0
|
11-29-2016, 02:16 PM | #6 |
Brigadier General
770
Rep 3,555
Posts |
Okay. I'm not doing those PID that DWR offers. I'm running Carly for BMW app. I thought these PID were for Torque. I'm a newb when it comes to this data stuff though so I could be full of s***.
|
Appreciate
0
|
11-29-2016, 03:13 PM | #7 |
Major
322
Rep 1,157
Posts |
So I never mentioned this because I didn't think it was necessary, but my completely stock 335D also reads a constant 2000PPM Post SCR NOx. I believe it does the same for Pre-SCR NOx as well. Is this an issue? My car runs just fine, and the check engine light is only on due to my EGR block.
|
Appreciate
0
|
11-29-2016, 03:18 PM | #8 | |
Major
244
Rep 1,293
Posts |
Quote:
|
|
Appreciate
0
|
11-29-2016, 03:27 PM | #9 |
Major
322
Rep 1,157
Posts |
So I've seen all of those numbers. Most of the time it shows 2000ppm, but after some time driving it will go to -97 and -99 -ish. I guess everything is right with the world.
|
Appreciate
0
|
11-29-2016, 04:28 PM | #10 | |
Colonel
615
Rep 2,408
Posts |
Quote:
http://www.e90post.com/forums/showthread.php?p=19151674 The sensor output signal should increase as pressure increases. 95 psi has got to be full scale... If you see the same 95 psi PID value with or without the sensor, I'd guess your sensor is bad, or the connection was bad, or the DDE interface to that sensor was bad. To check the sensor, one thing you can do is blow/suck on one of the tubes to the sensor and monitor what happens on DWR's Torque PID to see if/how the reading changes. I did this to determine the polarity of which tube was the positive pressure inlet. Make sure your wife doesn't walk into the garage while you're doing this, or you will get some interesting questions...
__________________
2011 335d 11.68 @ 125.71 mph 1/4 mile NHRA certified track
Ram Cummins with lots-o-mods |
|
Appreciate
0
|
11-29-2016, 04:31 PM | #11 |
Brigadier General
411
Rep 3,051
Posts
Drives: 2009 BMW 335d
Join Date: Jan 2012
Location: Toronto, ON, Canada
|
You getting the new "tune" from Jarek?
|
Appreciate
0
|
11-29-2016, 04:41 PM | #12 | |
Brigadier General
770
Rep 3,555
Posts |
Quote:
|
|
Appreciate
0
|
11-29-2016, 07:03 PM | #13 |
Colonel
615
Rep 2,408
Posts |
:-)
More like, "What are you doing with that hose in your mouth?"
__________________
2011 335d 11.68 @ 125.71 mph 1/4 mile NHRA certified track
Ram Cummins with lots-o-mods |
Appreciate
0
|
11-30-2016, 01:10 AM | #14 |
Colonel
870
Rep 2,611
Posts |
|
Appreciate
0
|
11-30-2016, 01:19 AM | #15 | |
Colonel
870
Rep 2,611
Posts |
Quote:
|
|
Appreciate
0
|
11-30-2016, 06:09 AM | #16 |
Colonel
615
Rep 2,408
Posts |
The sensor still works on all the versions of Jarek's remaps I've used on my car (I still use its sensor data to calculate mass air flow within a custom Torque PID). However, it doesn't appear the sensor data impacts any operating behavior.
__________________
2011 335d 11.68 @ 125.71 mph 1/4 mile NHRA certified track
Ram Cummins with lots-o-mods |
Appreciate
0
|
11-30-2016, 07:51 AM | #17 |
Brigadier General
411
Rep 3,051
Posts
Drives: 2009 BMW 335d
Join Date: Jan 2012
Location: Toronto, ON, Canada
|
|
Appreciate
0
|
11-30-2016, 08:53 AM | #18 |
Second Lieutenant
55
Rep 216
Posts |
I had the dpf pressure sensor on my car for a couple of months. Then one day just took it off. I never noticed a difference. Is there one? I don't log much at all so I never checked. I thought it was a null sensor post tune . Is it true that Jarek has an updated tune with more HP/tq?
|
Appreciate
0
|
11-30-2016, 09:10 AM | #19 |
Major
244
Rep 1,293
Posts |
Thank you TDI and all who have provided comments.
TDI's explanation was quite helpful including his attached link detailing the experience using the Diff pressure sensor as a tool for measuring intake air flow. Great article, informative and full of very cool data methodology (even if it is over my head). So interpreting this as it relates to my findings, it sounds like the cars default behavior is to report 95psi in the absence of sensor values to show otherwise. It also sounds like this should not affect the running of the car as TDI has used this sensor for other methods with no ill effect on performance / tune. The reason I had asked to begin with, on my car, it seems like once every 500 or 600 miles the car begins to feel laggy and fuel consumption increases. My layman's theory was that perhaps the DDE saw the 95psi and was trying to initiate a periodic regen even though I have full delete. This past instance the laggy feeling began immediately after a tank refill and lasted ~100 miles. |
Appreciate
0
|
12-01-2016, 12:37 PM | #20 |
Private First Class
22
Rep 109
Posts |
I too use DWR's custom PIDs for Torque Pro, however, my car has full emissions gear still intact. My DPF Pressure reading vacillates between reasonable/plausible values and 95 PSI while driving. Interestingly the frequency it pegs to 95 seems to change with ambient temperature (pegging almost 50% of the time when greater than 60*F and 20% of the time when colder).
At any rate, this behavior has not triggered any SES codes or shadow codes, although I suspect it may be contributing to shorter DPF regeneration cycles. I have a replacement but I failed to get the old one out in my first attempt (big hands in a small area), need to try again but not looking forward to it. Last edited by 335dwanted; 12-01-2016 at 12:39 PM.. Reason: type |
Appreciate
0
|
12-01-2016, 12:59 PM | #21 |
Lieutenant Colonel
222
Rep 1,909
Posts |
I can share what happened to me (could be irrelevant lol) - I got the Jarek's tune on Fri and got exhaust replacement done the following Monday, and the car kept throwing check engine light on the weekend, went back to Jarek, he found diff presssure sensor not plugged in, plugged it in & no more CEL - so I believe even after the tune the system's reading that thing ... haha I could be off
__________________
Mods: 7" VRSF FMIC, Forge DVs, RB PCV, BMS Oil Cooler, VRSF DPs, MHD, JB4g5, OFT DIYs: Walnut blasting : Trans Oil at 45k, w Filter at 65k : Diff Oil Flush @ 45k : WP&TS @ 69k : Alternator @ 79k --- E70d Alphabet Soup del 44.4k : JR Stg2.25 tune : Buzzken Catted Exhaust : Trans fluid drain/ fill (3 Qrts), both Diffs fluids flushed Wheels: Style 95s on PSSs (Sold): AG 359s on S04s : 162s on Blizzaks : Rohana RF1 Matt black
|
Appreciate
0
|
12-01-2016, 03:51 PM | #22 | |
Colonel
870
Rep 2,611
Posts |
Quote:
|
|
Appreciate
0
|
Bookmarks |
|
|