09-23-2019, 05:11 PM | #1 |
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BMW M2 Anti-Lag braaap sound after lifting the throttle
Hello everyone,
I have been thinking about what makes this "braaap" sound after lifting the throttle in M2 (non competition). It is done by the wastegate right? Could I possibly implement it on M235i/M240i by purchasing DME/turbo&exhaust manifold from M2 and putting it on 235i/240i? The sound I'm looking for: It sounds like anti lag system, Just to be clear, I'm not looking for other burble tune. Thanks! |
09-23-2019, 09:29 PM | #2 |
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I'm also curious to learn what causes this sound!
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09-26-2019, 05:47 AM | #5 | ||
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Quote:
Here's a quote from @Andrew Quote:
Used DME for M2 cost around ~1.2k I believe. With catless downpipe it sounds even better! |
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09-26-2019, 08:32 AM | #6 |
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i believe the difference on the limiter in sound between a m2 and normal n55 (235 etc) is that the m2 has a hard cut limiter that makes that aggressive braap noise. if you look at the m2 rev gauge when its on the limiter it bounces a lot more aggressively then a 235.
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09-26-2019, 10:38 AM | #7 |
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My 228i does a similar sound on upshifts after muffler delete. Not as pronounced though. The M2 has a more aggressive exhaust then the normal 2 series, so it makes sense.
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09-26-2019, 05:34 PM | #8 | ||||
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Quote:
Tech Part: Quote:
Quote:
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09-30-2019, 12:22 AM | #9 | |
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Quote:
https://www.e90post.com/forums/showt...18714&page=118
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10-02-2019, 07:13 PM | #11 | ||||
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https://f80.bimmerpost.com/forums/sh....php?t=1211456 Quote:
Quote:
Quote:
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10-03-2019, 12:18 AM | #12 | |
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10-03-2019, 04:49 AM | #13 |
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10-05-2019, 12:42 AM | #15 |
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im talking about the sound the m2 makes on the limiter when you rev it it cant be a gearbox related noise as the manual makes the same sound.
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10-05-2019, 01:24 AM | #16 |
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I looked into this a bunch and reached out to both Wedge and PureBoost about it.
Wedge said that they had looked into it before and hadn't been able to figure it out. Ken suggested getting in touch with Fabian and PureBoost. I contacted Fabian who also said he had been trying to find the parameters that make the M2 do this overrun but hadn't yet found it - and said he would get back in touch with me. It is definitely overrun controlled by the DME though. Though the throttle closure on the M2 might also have something to do with it. I've wanted this sound badly on my M235 for a while lol.
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10-07-2019, 02:03 PM | #18 | |
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10-09-2019, 06:49 PM | #19 | |
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It's more like soft limiter but ALS (Anti-Lag System) kicks in and that's why you hear it. Pretty much all M cars does this right now (maybe besides newest M5). Definitely not a "hard cut limiter", even the thing with wastegate which @nioh_lbbm2 said is more realistic than hard cut limiter. Make sure to analyze those two videos. |
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10-11-2019, 03:31 PM | #20 |
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Not sure if it's because of this thread, but a customer came to me with this thing.
I'll try over the weekend to flash my N55 EWG with the M2 files for testing.
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10-13-2019, 09:54 AM | #21 |
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I don’t think that will work. Doesn’t BM3 have a stock M2 map - does that give you the sound? Very interested in this.
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10-14-2019, 09:10 PM | #22 |
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The BM3 m2 maps just transfer over the basic M2 parameters. The M2 use totally different software BUT the same hardware. Normally BMW protect those by FSC (Preventing you from flashing the 320i into a 328i) but the M2 DME is running an incompatible eeprom so it seems they didn't bother
Replacing the eeprom in the DME is not something that can be done by bootmod or by OBD at all.
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als, anti-lag, bmw 235i, bmw m2, braap |
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