Bm3 trans flash questions

drapzzy · 11-16-2021, 04:31 PM

So i recently flashed the bm3 trans flash, I currently am on stage 2 ACN on bm3 but when I switch over to sports transmission and short shift or am in the earlier shifting points like 2-3.5k it makes this thunk when shifting, not sure if its normal or if the timing is off (2016 328 LCI N26)

exE36M3 · 11-16-2021, 05:06 PM

Mine does too...but for me... it's a combo of the LSD locking up and the clamping force of the internal clutch to pressure plate in the auto-tranny. I vaguely remember the flash release notes saying something like an increase in clamping force.

It's not a loud thunk or clunk or bang... but rather a firm connecting sound.

I only get it when I give it a lot of throttle (like around town flooring it or on freeway and I floor it).

drapzzy · 11-16-2021, 06:42 PM

Quote:

Originally Posted by exE36M3

Mine does too...but for me... it's a combo of the LSD locking up and the clamping force of the internal clutch to pressure plate in the auto-tranny. I vaguely remember the flash release notes saying something like an increase in clamping force.

It's not a loud thunk or clunk or bang... but rather a firm connecting sound.

I only get it when I give it a lot of throttle (like around town flooring it or on freeway and I floor it).

could not of said it any better, but it def shifts harder and faster now and I love it for daily driving feels solid, are you also FBO stage 2 on ur 435?

exE36M3 · 11-17-2021, 09:42 PM

I'm just stage 1... I'm an old guy, 91 CA fuel, and running stock cats still. So the +65Hp bump is dramatic enough to keep my happy.

heifetz17 · 11-18-2021, 10:22 AM

I'm on bm3 stage 2 with the trans flash as well. I also have sport auto trans and sport+ mode coded in.

Mine doesn't make any clunking or other noises, but does shift incredibly fast and hard, especially under full throttle.

drapzzy · 11-29-2021, 03:40 PM

Quote:

Originally Posted by heifetz17

I'm on bm3 stage 2 with the trans flash as well. I also have sport auto trans and sport+ mode coded in.

Mine doesn't make any clunking or other noises, but does shift incredibly fast and hard, especially under full throttle.

are you full bolt ones

anotheran · 11-29-2021, 11:52 PM

the BM3 8 speed TCU flash lugs the engine. It's based on the N55 shift points. Should really get xHP.

drapzzy · 11-29-2021, 11:54 PM

Quote:

Originally Posted by anotheran

the BM3 8 speed TCU flash lugs the engine. It's based on the N55 shift points. Should really get xHP.

its no biggie only under high load, doesn't really bother me and I don't think it damages the tranny

heifetz17 · 12-02-2021, 03:15 PM

Quote:

Originally Posted by drapzzy

Quote:

Originally Posted by heifetz17

I'm on bm3 stage 2 with the trans flash as well. I also have sport auto trans and sport+ mode coded in.

Mine doesn't make any clunking or other noises, but does shift incredibly fast and hard, especially under full throttle.

are you full bolt ones

I am.

11-16-2021, 04:31 PM	#1
drapzzy First Lieutenant 62 Rep 383 Posts Drives: F82 Join Date: Apr 2021 Location: LA iTrader: (1) Garage List 2016 BMW 328i [0.00]	Bm3 trans flash questions So i recently flashed the bm3 trans flash, I currently am on stage 2 ACN on bm3 but when I switch over to sports transmission and short shift or am in the earlier shifting points like 2-3.5k it makes this thunk when shifting, not sure if its normal or if the timing is off (2016 328 LCI N26)
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11-16-2021, 05:06 PM	#2
exE36M3 BMW CCA Member 488 Rep 808 Posts Drives: 2015 435i M Sport Join Date: Jan 2018 Location: NorCal iTrader: (4)	Mine does too...but for me... it's a combo of the LSD locking up and the clamping force of the internal clutch to pressure plate in the auto-tranny. I vaguely remember the flash release notes saying something like an increase in clamping force. It's not a loud thunk or clunk or bang... but rather a firm connecting sound. I only get it when I give it a lot of throttle (like around town flooring it or on freeway and I floor it).
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11-17-2021, 09:42 PM	#4
exE36M3 BMW CCA Member 488 Rep 808 Posts Drives: 2015 435i M Sport Join Date: Jan 2018 Location: NorCal iTrader: (4)	I'm just stage 1... I'm an old guy, 91 CA fuel, and running stock cats still. So the +65Hp bump is dramatic enough to keep my happy.
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11-18-2021, 10:22 AM	#5
heifetz17 Second Lieutenant 90 Rep 234 Posts Drives: 2013 328xi Join Date: Oct 2020 Location: Montana iTrader: (0)	I'm on bm3 stage 2 with the trans flash as well. I also have sport auto trans and sport+ mode coded in. Mine doesn't make any clunking or other noises, but does shift incredibly fast and hard, especially under full throttle. __________________
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11-29-2021, 11:52 PM	#7
anotheran Sedan Driver 389 Rep 1,018 Posts Drives: A nice car Join Date: May 2016 Location: Canada iTrader: (0)	the BM3 8 speed TCU flash lugs the engine. It's based on the N55 shift points. Should really get xHP. __________________ Slapping on M Performance parts, ZHP, badges, and stickers does not ///M car make ZCP \| ZHP \| ZTR \| ZE0 \| MSport \| ZMP \| DHP \| MStickerPack \| THP \| MPPSK \| MPPK BMW MSP Lightweight Jacket \| DTM Motorsport Team Cap\| BMW M Drift Cat 5 \| BMW M Thermo Mug
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