11-12-2021, 02:18 AM | #1 |
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OPF delete difference
A lot of people are talking about deleting their OPF on the EU cars. What will be the difference? Will the car be a lot louder and how about the burbles? Or just another tone?
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11-12-2021, 03:18 AM | #2 |
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EU car will sound more like an M2C from non OPF market.
Main benefit is EU OPF delete will liberate more oomph from the stock car, w/o needing to remap. EU car's ECU runs more aggressive fuel/boost/timing thatn non OPF cars. ;-)
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11-12-2021, 12:24 PM | #3 |
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I have eliminated OPF and central silencer by installing Actuve Autowerke kit bought from
https://pureturbos.eu/aa-midpipe.html I am very happy . Car with closed valves stays quiet . With open valves it is exceptional. You gain at least 15 hp. You have to install LEIB emulator as well. https://www.leib-engineering.de/en/l...mpetition-f87n or about every 50 km car goes into sleep mode (do not exceed 110 km per hour). You have to turn off the car and then turn it on again. |
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11-13-2021, 03:26 PM | #4 | |
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11-14-2021, 03:22 PM | #6 | ||
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OPF is considerably more of a restriction than secondary cats of non OPF cars. Remove OPF and the stock ECU will be aiming at higher parameters. Without the restriction the car will be more responsive and will be able to hit and maintain higher targets wo heat issues
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11-21-2021, 02:58 PM | #7 | |
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Boost request, fuel, and ignition timing are the same for both models.
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-2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs.
-2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe. |
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11-23-2021, 03:32 AM | #8 | |
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Modern lean burn turbocharged are very sensitive to back pressure. Removal of any blockage ie decatting is a known path to improve performance w/o remapping. OPF construction |(pre-cat + baffled honeycomb filter) is designed to create a higher back pressure than a 2nd cat. Like for like, removal of OPF vs removal of 2nd cat - the performance benefits with respective std ECU tunes will be greater for OPF version than that of 2nd cat delete.
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Robin_NL8761.50 |
11-23-2021, 08:54 AM | #9 |
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But the thing is, both the cars have the same internal torque calculations, and the same parameters, settings, and PID controllers for the turbo to build that torque.
The ECU control on this is completely different than cars in the past, there are no boost maps, and everything is calculated live. Everything follows the internal torque model, and that is unchanged between the two cars. The OPF car does not aim for higher parameters.
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-2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs.
-2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe. |
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12-16-2021, 03:31 AM | #10 |
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A few days ago the deleted the OPF on my M2C. The car is so much louder!
Be careful if you delete the OPF on European cars. I got the Miltek Equal Lenght Exhaust and it's almost so loud as my previous M2 OG which was straightpiped. And I still got the original cats. You also have to like the burbles / pops and bangs. These are so much louder and sometimes too long. My car is running on stock software and went after some hard runs in limp mode. But we solved this with the Leib connectors. |
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Robin_NL8761.50 |
12-18-2021, 02:45 AM | #11 | |
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The biggest difference for me is the throttle response. Huge difference compared to before. You are also allowing your motor to breath alot more, so its definitely healthier for the motor. |
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Robin_NL8761.50 |
12-19-2021, 01:54 AM | #13 | |
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Cheers Robin |
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12-19-2021, 01:55 AM | #14 | |
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Thanks Cheers Robin |
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12-19-2021, 12:02 PM | #15 | ||
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I am curious to know if the non-OPF cars still put down much more power to the wheels than OPF cars regardless of the tune, hence the strong stock whp numbers observed here in the US. |
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04-12-2022, 08:14 PM | #16 | |
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Drives: BMW M2 Competition 2018 f87
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I did every software reset/ OPF replacement via ISTA+ (according to their instructions) but to no avail. BM3 tuning is the only solution I guess. Thanks! |
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