03-14-2021, 06:51 PM | #89 |
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I got a notification saying BM3 needs an update. After updating the app, i jump on to their website to see what the new features are. They say Anti Lag, Map switching, and a couple of other things, but all this stuff says it ONLY works on S55 engines... BUMMER
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03-23-2021, 12:38 PM | #91 |
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06-04-2021, 10:50 PM | #93 |
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BM3 did an update for N55 platform, the Anti Lag is different from what ive seen on videos compared to tha M2 DME. Still on tha hunt for that Braap sensation when you lift off tha throttle..
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06-21-2021, 03:25 PM | #94 |
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07-10-2021, 11:54 AM | #95 | |
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To be clear, we are looking for that sounds when he lifts off the throttle |
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11-28-2021, 09:46 PM | #97 |
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I've noticed this is common on all the actual M cars - I think it has something to do with the DCT's relationship with the ECU (causing ignition to retard timing to slow the RPM faster to shift faster) and thus creates a anti lag effect similar to that of the new flash tune antilags.
If I were to guess- they both retard timing heavily to create boost, one (flashed M235i) does it to limit RPM climb during boost build up and the other (M2 that makes this sound) does it to actively lower RPM between shifts but with the same mechanism (deep negative timing - essentially running gas through the cylinder and out while engine braking hard off the compression phase). N55 M2 w/ 6MT models probably share the same ECU as the DCT M2 and and have a similar ignition retard function on shifts because it has auto rev match, which does the same quick reduction of RPM mid shift. My 2 cents. Programming this in would likely go hand in hand with auto rev match features. It also may not be possible to tune in this condition to our ECUS. Could someone from protuning freaks mhd or other tuning company with an understanding of both platforms pitch in?
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14' Alpine White M235i 6MT, BM3 Stg2+, VRSF DP-CP-FMIC, Dinan Muffler, GFB DV+, 3.5 bar MAP, Dorch Stg1 HPFP, NGK 97506, BM3 Flexfuel Kit, CDV delete, KW V3, EDC delete, Powerflex Camber LCA bushings, VMR 801 18x8.5/9.5 et45, Conti Extremecontact 235/265
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12-01-2021, 02:59 PM | #98 | ||
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It still does exact same sound, so it's proven that it doesn't matter if it's manual or DCT. Quote:
No news since then. Yea I agree, I really would like to have it. N55 sounds so good with it. |
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01-16-2022, 07:51 AM | #99 | |
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Any source to confirm this? Seems like 2022 could be a nice year |
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02-02-2022, 11:08 AM | #100 |
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MHD released the update yesterday! (For those that don't monitor the F30 forum)
https://www.instagram.com/tv/CZcfbzC...dium=copy_link |
02-02-2022, 03:26 PM | #101 | |
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02-02-2022, 07:19 PM | #102 | |
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proTUNING Freaks Your turn!
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02-02-2022, 08:02 PM | #103 |
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02-04-2022, 12:53 AM | #104 |
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I'm quoting Cary Jordan from a thread a while back:
https://f80.bimmerpost.com/forums/sh....php?t=1208681 (Post 14) "I haven't been able to confirm my theory, but I think the DME is re-using charge pipe boost on throttle lift for anti-lag purposes by allowing the throttle plate to stay open on lift-off allowing the engine to ingest the excess boost, which pushes the excess boost through to the turbine section, helping to keep the turbos spooled and the EWGs are helping to facilitate this as well by either bypassing the turbine wheel or allowing the pressure to flow through the turbine wheel depending on what conditions merit. The throttle plate remaining open on throttle lift-off is confirmed by me through datalogs. This would also help explain the brap or "farts" that you hear during a lift-off event with significant boost pressures. I suspect that there might be some valve overlap trickery going on during these events as well. This would also help explain the "swoosh" sound we hear in the intakes from the sound of the excess boost slipping back past the throttle plate. So, by doing this, BMW has achieved two things. A form of anti-lag as well as keeping the excess boost pressure from backing back up in the turbos without the use of a diverter valve. Brilliant, actually." Sounds like because the S55 does not have a charge side pressure discharge (BOV or recirculating DV like we have on the N55), it creates situations where the pressure flows out of the engine quickly rather than in a manner that would produce useable torque by retarding the timing heavily while keeping the throttle plate open temporarily following a throttle lift off. AKA, blow the mixture through with such delayed combustion that as the exhaust valve opens it blows up and out of the cylinder as the piston travels up in the exhaust phase instead of during it's normal combustion/power phase. No power, crazy sound, turbulent gasses still working on the turbine. As CJ said, this is similar to a traditional rally type antilag that works by moving the combustion of the air/fuel mixture from the cylinder to the actual turbocharger housing pre turbine, to maintain the wheel speed and hence immediate booster throttle response as the driver gets back on the throttle. Another post in this thread much earlier on suggested that this braap sound might happen because of a change in the exhaust valve matrix, which even in a vanos/timing chain controlled setup is not possible because it is SO far out of the normal operation (would require rotations not degrees of the camshaft to complete). I think that logic was on the right path but instead of physically allowing the normal combustion process to escape with altered exhaust valves, I think it just alters the timing of the combustion instead. HERE is my proposal: MHD users with this at their disposal! Log a few vigorous runs with (both settings) and then without this feature enabled with throttle angle, MAP, (both intake manifold and charge pipe) and any fuel injector duty cycle channels open. Let's see if there is any difference in both the throttle plate behavior and the boost trends in the logs of each mode. If we see boost being held longer with less throttle snapback on off throttle, we might be able to suspect this mode is actually just disabling the DV control and forcing everything into the engine with slight updates to make that situation safer for the longevity of the turbos.
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02-04-2022, 07:26 AM | #105 |
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02-10-2022, 06:59 AM | #107 | ||
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Since you are catless + bypassing resonator and muffler it should sound similar to what we could see in the first video. |
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02-10-2022, 09:43 AM | #108 |
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02-18-2022, 03:24 AM | #109 |
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Little late but MHD just added the Braap feature for all N55's. You can choose between short and long(M2 vs M2C sound).
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02-22-2022, 12:04 PM | #110 | |
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That's what I found so far: https://www.youtube.com/shorts/q0YJ7W9SOe4 https://www.youtube.com/shorts/xddbNMbjQ3E |
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als, anti-lag, bmw 235i, bmw m2, braap |
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