02-07-2019, 03:47 PM | #23 |
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I would think that doing that would trigger a circuit code. It would be nice to know exactly what pressures it's actually trying to see or if it's just looking for a certain pressure differential.
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02-07-2019, 05:02 PM | #24 |
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Guys we really do need an easier solution than to resort to remapping. Very keen to know how you get on gents; please keep us updated.
The annoying thing is that non-EU M2C’s sound much better with even secondary cats still in place; go aftermarket and the sound difference is staggering. |
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02-07-2019, 06:01 PM | #25 | |
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02-08-2019, 03:32 AM | #27 | |
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Once OPF limp code is understood/worked around, would it not be cheaper/easier to fit sport cat DP's and then gut OPF of OEM midpipe ? Then, visually OPF looks in situ and running sport cat DP's should get S55 though emissions test perhaps ? BP
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02-08-2019, 03:37 AM | #28 | |
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Also a sport car DP will not fit in the space next to the engine I heard (not 100% sure), so those are not an option, next to the fact that you put too much strain on the OPFs. You can change whatever you want, but it are the sensors at the end of the downpipes that are the issue not the OPF itself. The trick is to fool the car the sensors are reading the right back pressure or make sure that what they read is not taken in consideration by the ECU. If you have created that set up you can what you want. Emission testing is not applicable now. Your MOT is three years away. MR |
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02-08-2019, 03:56 AM | #29 |
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Sport cat DPs re about £2500-3000 compared to under £500 for Decats.
The way i see it, fit a US mid pipe with sec cats to pass MOT and they would also pass as OPF for visual inspection too. My old n54 335i flew the MOT with only secondary cats. Decat DPs. Win win. Sound, power etc. It would sound great and maybe sec cat back pressure would give less problems with OPF sensors who knows? Yes MOT is 2.5 years away but it needs considering now really to avoid big bills & problems then. Only problem is non EU mid pipe is £2450 after discount.... Maybe buy used from US guys? |
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02-08-2019, 05:18 AM | #30 | |
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Be aware that the EURO6 regulations are different to the EURO4 or EURO5 regulations of your N54 335i. There is a reason you have OPFs to pass EURO6. If we did not need those OPFs to pass, then they would not be on the car. I don't believe that you will pass MOT in 2.5 years with only a US linkpipe with secondary cats. I think your car will fail, since it is not EURO6 compliant on the emissions which will be measured by then. I hope you see my point. I think you are looking for the cheap route here, which isn't a solution imo. Doesn't mean you can get the linkpipe from the U.S., but it doesn't make your car compliant to EURO6, because your emissions are still worse than you have now. Also your car is not CoC compliant and therefore illegal since the measured emission level is not the same as on your CoC paperwork. It would be wonderful what you say, but I have my doubts you get away with it. They can't measure EURO6 now at the MOT since it is not required, but I can ensure you in 2.5 years they will and it will be freaking strict. Of course, all becomes different if you guys can finally make up your mind about leaving the EU. MR |
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02-08-2019, 05:41 AM | #31 |
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In theory MR you are right, but in the UK (and may other places) the annual emissions checks are just a very loose functional check of CATs and hydrocarbon emissions / lamda readings.
More recent checks for integrity of emissions systems are "visual inspection" only and covers etc are not to be removed (engine undertrays for example). There will be no OPF test in the same way there is no DPF test. My 335i was well inside the test limits with only Secondary CATs because the test limits have barely changed since 1996 when CATs test was introduced. The test is to detect NO or failed CATs only, not the check type approval level! It is not possible for a regular garage to test to the relevant EURO4/5/6 limits, you would need very expensive equipment, almost laboratory conditions and well trained technicians - This is exactly what you average back street MOT garage does not ever have and the government would never pay for it either. ...so back on thread... secondary CATs would pass MOT, but we still need to deal with OPF detection on the car... EDIT: I've just checked MOT data, and the N54 335i has a CO pass limit of 0.2% (which mine passed with only sec cats at less than 0.1%). But the S55 F80 M3 has a CO limit of 0.3% - so 50% higher than the old N54 engine! Good old MOT Last edited by doughboy; 02-08-2019 at 07:12 AM.. |
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02-08-2019, 07:02 AM | #32 | ||
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Also sport cats DP not fitting - doubtful else why do LW in Germany offer them for M2Comp ? BP BP DB - yes LW charge £3k for their catted DP's but the likes of Milltek sell catted DP's for s55 for half this price....BP
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02-08-2019, 07:43 AM | #33 | |
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Interesting on the catted DP's. Great feedback. Someone was talking to me about it and said it would not fit, which I was a bit like "really" about. Uhmmm, as I said, not 100% sure on that one. I believe you immediately that is available. I have just not seen it anywhere. In the end, I am not going for the sport downpipe, I don't really see the benefit for it with my current set up. MR Last edited by MR.; 02-08-2019 at 07:49 AM.. |
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02-08-2019, 07:48 AM | #34 | |
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I was not aware of the UK systems, but if it is that easy then bring it on. This seems to be easier than I initially thought, but then again let's just hope they aren't going to update any of the systems like in Germany. It is freaking 2.5 years away. Can you imagine what happens if in the news drops that all cars might be EURO6, but there is no way to test that during a MOT? It would become MOTgate. Everyone is so stressed about emissions everywhere... Pfff meanwhile plans are flying more and more and oil tankers are pushing out worse gasses into the sky. Feels like the German market is leading on this matter again and the other markets are far behind and not even following yet. I wonder if my current set up is even "homologated" in my country, because we are further behind then the rest of Europe on this matter. Thanks for the explanation. Learned something new about the UK. MR |
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02-08-2019, 11:07 AM | #35 |
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Very interesting discussion - just to explain, my primary reason for removing them is sound. I’m hoping for a slight improvement in throttle response as well. I know the S55 isn’t universally liked for its sound but it would still be nice to have some of the ‘violence’ and snarl of the CS/GTS cars. For me, the midpipe is where the biggest restriction happens - you can put whatever backbox takes your fancy but I can’t stand these bricks killing the sound!
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02-08-2019, 02:17 PM | #36 |
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MR, in the UK there was uproar a few year ago at diesel owners removing diesel particulate filters when they failed to avoid the high cost of new ones, the same will happen with OPF in time. (Do you know our OPFs will need replacing in 60,000 to 100,000 miles at owners cost).
That is when they introduced the "visual inspection" of emissions equipment to the MOT and also made it illegal to sell remaps to specifically remove emissions equipment. So the MOT relies on visual checks and lack of any CEL. No OBD check's are included... Last edited by doughboy; 02-08-2019 at 02:28 PM.. |
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02-08-2019, 02:27 PM | #37 |
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For me the S55 is the descendant of the N54 rather than the N55, The N54 had twin turbos with separate exhausts all the way just like the S55 and it sounded just awesome with decat DPs and standard rest of system. Deep, rorty, great sound from the thin-walled DP's. If I can make the M2C sound like my N54 335i I'll be a happy man. |
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02-08-2019, 03:00 PM | #38 | ||
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And I ran 450 hp and 600 Nm on my 135i, which meant that the car went in limp mode because the actuators got stuck because they could not keep up with the required faster movement. MR |
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02-08-2019, 05:18 PM | #39 | |
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The OPF- spec ones sound shite however 😂 |
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02-08-2019, 05:45 PM | #40 | |
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The buyer contacted me 4 years later to say the car had been faultless and was the best car he had ever owned! Praise indeed. |
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03-11-2019, 07:57 AM | #41 |
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03-11-2019, 04:50 PM | #43 | |||
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I'm getting the LightWeight system next month, keeping OPFs. I saw recently their sport downpipes are coming in at just under €3,000 as you mentioned, which isn't ideal. Do you know if alternative downpipes can be interchanged with different exhaust systems, i.e. could I use a Milltek DP with the LightWeight exhaust or would they not line up correctly? Cheers, Karl
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03-11-2019, 05:38 PM | #44 | ||||
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It's usual for aftermarket DPs to fit stock exhaust and aftermarket exhausts to fit stock DPs. Safe to assume that aftermarket DPs and aftermarket exhausts are cross compatible. BP
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