03-11-2019, 06:39 PM | #45 | |||||
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I hope that's the case so I don't have to buy LW DPs if I want to go down that route at a later date. Still, I'm not going to sweat it if it's not possible later down the line. Cheers, Karl
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03-12-2019, 03:19 AM | #46 | |
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03-12-2019, 03:28 AM | #47 |
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No but i will be playing soon when i get the OPFs off.
I'm interested to find out what the DTCs / fault codes will be. Everyone just says "arrrgh limp mode" but what faults are actually behind it? I've not seen anything more. It might not just be a emission check as these dont usually cause limps. The sudden drop in exhaust back pressure will also upset the boost control / PWM levels resulting in greater boost for a certain actuator force, so there maybe multiple faults coming up. Remember OPF cars run more boost to compensate which means OPF restriction is significant. Boost target overshoot used to limp my N54. Until someone posts a full ISTA diagnostic dump I'm open to all theories... Last edited by doughboy; 03-12-2019 at 09:48 AM.. |
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03-12-2019, 05:39 AM | #48 | |
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That's a relief to hear another person back that up. It means I will have good range of downpipe options should I want to take this route at a later date.
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09-26-2019, 09:57 AM | #50 |
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09-27-2019, 04:00 AM | #51 | |
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my problem is that the car goes into limp mode on the Autobahn and almost never here in sweden( once on a long road trip up north).i guess the JB4 passive delete will only turn off the CEL once its on and will not help preventing the car from going into limp mode, i really don't want to tune the car and was really excited to read that marc might had a solution by now |
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09-27-2019, 04:34 AM | #52 |
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Something I noticed in ISTA diagnostics (if you have it) is you can run recalibration for a new OPF.
I.e. if lets say you had your OPF replaced by BMW the DME needs to re-set it self to the new OPF characteristic. So I wonder if resetting this with an OPF delete would mean the DME would then except that new back pressure as being "correct" if that makes sense? |
09-28-2019, 01:04 PM | #53 |
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Yep, the solution is ready for your car. Product will become available really soon and pre-order will start next week!
I have seen it, hold it in my hands and it is ready for F-Series and G-series, not for the M2C yet. That car proves to be a bitch. Production is now running so that clients can be helped accordingly over the coming weeks. MR |
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10-31-2019, 02:16 PM | #54 | |
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Please DM me about this solution! |
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11-01-2019, 08:22 AM | #55 | ||
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11-02-2019, 01:46 PM | #56 |
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11-03-2020, 04:10 AM | #57 |
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Hello MR ! I have ordered the AA Midpipe for my M2 CS , so the only way now its the tune ? i dont want to tune my car for more hp , just leave it the same hp but turn off the limp mode. even if the answer is a tune , isnt it just disabling the opf sensor ?
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11-03-2020, 05:25 AM | #59 | |
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11-03-2020, 05:40 AM | #60 |
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I mounted mine in the air vent but you can install it wherever you want (i've seen some mounted below the centre console). Mine was purchased mainly for its additional functions and data display but it's also a good solution for the OPF delete without having to tune the car.
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11-03-2020, 05:42 AM | #61 | |
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11-03-2020, 08:05 AM | #62 |
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11-04-2020, 05:20 PM | #63 |
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Is the installation of the AK MOTION module and then deactivating the OPF an easy job?
I mean would buying the module from a reputable seller and then letting a shop, which have never done the install before, be a reasonable decision? |
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11-05-2020, 12:51 PM | #64 |
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I wonder if relocating the sensor tubes from after the catalytic converter to before, will fool the electronics by reporting back a pressure reading?
For those that don't know, the OPF fitted cars have a pressure measuring sensor in each exhaust. The pressure sampling tube is placed after (downstream) of the primary CAT, but before the 2ndary CAT / OPF canister. So it effectively measures exhaust pressure just prior to the OPF /CAT2 system. I guess when it sees a high reading threshold, it triggers an active regeneration. But at all times it needs to see some kind of reading as a test. That's why a total OPF delete triggers CEL/LIMP. My thinking about how to fool it is in three forms. And by the way, I'm looking at replacing the OPF canister mid pipe to earlier style 2nd CAT type, not a full delete. Some of the techniques below could work for full delete too. 1.) move the sensor to pre primary CAT. As long as the pressure isn't high enough normally in this area (between turbo outlet and CAT elements) to trigger active regen, we should be fine. 2.) Fit an elbow pointing upstream on the sensor tubes. Normally the sensor is Tee'd into the exhaust at 90 degrees. This measures static pressure only. If we added an elbow facing the exhaust gas stream, we get a dynamic pressure (static + gas velocity). So with OPF removed, the pressure reading will increase with revs (as it will with the OPF in situ). Different size elbow bores can be used to modify the dynamic part. 3.) fit some type of electronic gain chip to the sensor. Like a JB+. There will be some pressure in the exhaust even with 2ndary CATs only, we just need to amplify that signal into the right range. The sensor itself is a 0-5v analogue unit, much like the boost pressure sensors, hence the reference to JB+ |
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11-22-2020, 02:32 PM | #66 |
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