12-07-2018, 10:35 AM | #1 |
Private First Class
54
Rep 139
Posts |
OPF Removal: CEL or Limp Mode?
Hi guys,
I’ve seen a few threads where people have said that removal of the OPF’s will lead to limp mode. Can we get confirmation that this is 100% true? The reason I ask is that both Remus and Superprint have made midpipes for the M2C that delete the OPF’s. Surely they would mention the risk of limp mode if the OPF’s were removed? I could tolerate a soft CEL every thousand miles as the N55 cars just triggered a light that could be reset via OBD tool and DashCommand or similar app. However, limp mode is actually quite dangerous and unexpected. Please could anyone clarify? |
12-09-2018, 07:55 AM | #2 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
https://f87.bimmerpost.com/forums/sh...&postcount=126 Remus and Supersprint maybe don't know that it happens or haven't tested it properly. God knows why they don't mention it on the site, but I can ensure you if you install those cat-back exhausts, remove the OPFs and don't install an ECU software file that disables the OPF pressure sensors you will get a limp mode over 5K rpm. It happens 100% for every car built after mid-August, a small number of cars built before run an old ECU software, but that software might well be updated as soon as you go in for a service at your dealer. MR |
|
Appreciate
0
|
12-09-2018, 08:45 AM | #3 |
Private First Class
54
Rep 139
Posts |
Thanks Marc. That’s disappointing to hear! I was really keen on deleting the midpipe and combining with Remus/Eisenmann. However, I’d rather not risk limp mode.
Will the Akrapovic link pipe that you’ve got fitted which deletes the OPF’s need the Delete-R to prevent a CEL/limp mode? |
Appreciate
1
n55co41.00 |
12-09-2018, 11:49 AM | #4 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
In the future there might be displays or control units that allow you to apply "delete-r" on the OPF pressure sensors similarly to currently with the sensors when you install catless downpipes, but those systems or settings in existing displays (e.g. Awron) or other products don't exist yet. MR |
|
Appreciate
0
|
12-09-2018, 05:04 PM | #6 |
Private First Class
54
Rep 139
Posts |
More information on OPF’s here:
https://www.newtis.info/tisv2/a/en/f...tem/1VnbnDH7q9 Seems from some M140/240 forums, limp mode is a hit and miss - some cars have it and some don’t. If it happens every couple of thousand miles then it’s not the end of the world if you switch the car off and restart. CEL seems to be triggered by the pressure measurement on the second sensor after the primary cat. Some people have had mixed results with valved exhaust backboxes, i.e Remus etc. Either way, I’ll want to find a way to remove them for extra sound. Let’s hope an ECU fix comes out to code the pressure check off. 😉 |
Appreciate
1
VIERsr2623.00 |
12-10-2018, 04:46 AM | #7 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
That will come for sure, but for now it is only a ECU tune! MR |
|
Appreciate
0
|
12-10-2018, 05:45 AM | #8 |
Major
2623
Rep 1,477
Posts
Drives: BMW M2
Join Date: Apr 2018
Location: Zurich
|
Are we sure that it's enough just disengage the sensor? Or maybe an ECU modification is required to disable the input of rigenerations, like in the diesel engines?
|
Appreciate
0
|
12-10-2018, 06:14 AM | #9 | |
Second Lieutenant
199
Rep 244
Posts |
Quote:
|
|
Appreciate
0
|
12-10-2018, 08:09 AM | #10 |
Private First Class
54
Rep 139
Posts |
I’m hoping the PTF team can add some functionality with BM3 to disable the check. From reading around, another EU M2C owner says they only got the limp mode after 1000km which isn’t the worst. Yes, if it comes unexpectedly then it’s bad, but if it goes away after switching off and restarting car then for me it’d be worth it to run a decent straight midpipe with sound.
|
Appreciate
0
|
12-10-2018, 09:06 AM | #11 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
MR |
|
Appreciate
0
|
12-10-2018, 05:06 PM | #12 |
Private First Class
54
Rep 139
Posts |
Just wondering whether BM3 CEL suppression would work to stop limp mode from happening? Maybe a question for them.
As for the risk of limp mode, it can happen to stock cars with faulty oxygen sensors or even gearbox issues. It’s a risk in any event. |
Appreciate
0
|
01-27-2019, 04:14 AM | #13 |
New Member
4
Rep 7
Posts |
Can anyone tell me whether the Burger Motorsports JB4 for the M2C would be able to be able to delete the CEL in relation to the OPF’s. I know it has the feature to read and delete codes. I’m thinking of getting the full Eisenmann system for mine but afraid to pull the trigger if it’s going to cause me lots of issues with limp mode.
Last edited by JackDW; 01-27-2019 at 04:19 AM.. |
Appreciate
0
|
01-27-2019, 11:04 AM | #14 |
Private First Class
80
Rep 147
Posts |
hi, i‘ve a supersprint set for sale, full exhaust excl. downpipes.
just write me in there is a need! my idea is to run downpipes with us exhaust, if someone offers an exhaust let me know! br, vale |
Appreciate
0
|
01-27-2019, 12:36 PM | #15 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
MR |
|
Appreciate
0
|
01-28-2019, 07:03 AM | #17 |
Major General
1545
Rep 8,970
Posts |
There's a lot of OPF delete exhaust around now, but I've not seen ONE supplier mentioning codes / limp mode or mapping needed.
Not good really. Have they even done proper testing? |
Appreciate
0
|
01-29-2019, 03:43 PM | #18 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
Some of them, I am not going to drop names, are often characterized as plumbers for a reason. Testing is often done by the customer and they develop exhausts like installing new piping in your bathroom. MR |
|
Appreciate
0
|
02-07-2019, 02:11 AM | #19 |
Major General
1545
Rep 8,970
Posts |
Hi all,
Does anyone have any more details about OPF removal issues? We really need to know the actual fault codes generated rather than just "CEL" or "LIMP". Once you know the codes you can see what the actual detection issue is, without that we're guessing. If it is a LIMP code then a regular CEL clear feature on JB4/BM3 etc probably won't deal with it. A limp code would usually be something where the drivetrain it at risk, so power is reduced. I can't see how OPF could be that serious, more like BMW engineers trying to make it more difficult to mess with the exhaust! I'm considering Decat DPs (which are cheap) then add non EU midpipes with secondary CATs (to pass UK emissions test). This depends on price of secondary CATs as spare parts.. |
Appreciate
0
|
02-07-2019, 02:37 PM | #20 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
I hopefully have some news soon that will put an end to all this shit with OPFs. Removal will then be a piece of cake everyone. More on it soon. MR Last edited by MR.; 02-07-2019 at 06:01 PM.. |
|
Appreciate
1
Karlosm2c290.50 |
02-07-2019, 02:41 PM | #21 |
Major General
1545
Rep 8,970
Posts |
I might do some testing this weekend and remove the bleed pipes from the pressure sensors which will simulate OPF removal, then I can use ISTA to diagnose in detail.
They are quite easy to reach turbo side of the engine. |
Appreciate
0
|
02-07-2019, 03:38 PM | #22 | |
Colonel
4399
Rep 2,856
Posts
Drives: BMW M2 CSL Turbomeister
Join Date: Sep 2013
Location: Travelling / Managing / Writing
|
Quote:
MR |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|