07-26-2021, 11:50 AM | #1 |
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Gear grind/lockout from 1st to 2nd...anyone find a solution?
I love my 2017 M2, I truly do. Its been the best car I've owned...aside from one...very glaring issue. It will occasionally grind/lockout on the 1-2 shift. This typically happens at higher RPM's (above 6k) and can happen in a straight line OR in a turn. Has anyone found a solution to this yet? Typically I do the easy answer....shift at a lower RPM, and thats fine...however I also autocross my car, and during prosolo events your reaction time and 60 foot actually matter...so shifting earlier isnt the better way.
A friend of mine who used to own an M2 (and is a national champion) had the trans replaced, motor/trans mounts replaced and fluid changed...with no change in the behavior. It would still do it occasionally, so I dont think its a synchro issue (I know thats going to be the first suggestion, but a new factory trans should eliminate that). Since we both ran/run in street class...stiffer engine mounts werent explored, so I'm curious if anyone had tried that and seen if the stiffer mounts fix it or not. I'm thinking about either moving into a different class where I can do these kinds of things, or trading the car for something else...which I'd hate to do. I love the car, but throwing away runs at national events because of this gear issue is...frustrating to say the least.
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07-26-2021, 11:55 AM | #2 | |
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07-26-2021, 12:41 PM | #3 | |
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07-26-2021, 05:45 PM | #5 |
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07-26-2021, 06:22 PM | #6 |
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Also following.
I have considered a heavier or different fluid but it sounds like that won't get the job done either. Group buy on custom gear ratios anyone? |
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07-26-2021, 06:35 PM | #7 | |
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The stock trans mounts are ridiculously soft I went with the Rogue Engineering transmission mounts https://www.rogueengineering.com/Rog...nts_p_137.html I did experience a very slight increase in NVH, but well worth it ECS also offers some stiffer poly mounts, but people have reported more NVH with those https://www.ecstuning.com/b-ecs-part...02705ecs02a~a/ https://www.ecstuning.com/b-ecs-part...002705ecs01~a/ You could also look into BMW Motorsport motor mount inserts (#3 in the link below) https://www.realoem.com/bmw/enUS/sho...diagId=22_0218 And VTT also offers motor mount inserts, as well https://vargasturbo.com/product/vtt-...mount-inserts/ |
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07-26-2021, 08:59 PM | #8 |
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Also forgot to mention the usual upgrades
Clutch delay valve removal and/or E90 Clutch Slave https://f87.bimmerpost.com/forums/sh....php?t=1625114 https://f87.bimmerpost.com/forums/sh....php?t=1682441 https://f30.bimmerpost.com/forums/sh....php?t=1666477 Autosolutions Short Shift Kit and Urethane Bronze Bushings http://autosolutions.info http://autosolutions.info/urethane-bronze-bushing/ Rogue Engineering Short Shift Kit https://www.rogueengineering.com/Rog...Kit_p_115.html Ultimate Clutch Pedal http://www.ultimateclutchpedal.com Some people have also claimed to have smoother shifting with different fluids such as https://www.redlineoil.com/dctf-dual...smission-fluid https://www.motul.com/us/en-US/products/multi-dctf Even though they are DCT fluids, both manufacturers claim that they are suitable replacements for the BMW MTF-LT5 fluid |
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07-27-2021, 12:16 AM | #9 | |
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Anyways what I noticed was my 1-2 shifts were so much smoother to the point of completely eliminating the knotchiness I felt early in my car's life after I changed out the transmission oil. I suspect that there was alot of particulate matter released during break in and so that is why the transmission fluid flush made such a huge impact. Also I wanted to go with redline dctf but it was out of stock locally and so I just bought some MTF-LT5 (which is actually the German made stuff directly from BMW AG in Germany if you are in Canada) and it is a night and day difference. Literally every shift is buttery smooth now.
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07-27-2021, 12:36 AM | #10 | |
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I am going to chalk it up to the ratios as mentioned, soft BMW transmission and motor mounts, and possibly something to do with how BMW specifies the transmission requirements (cost cutting on synchros?). I did CDV, fluid, shift knob, etc. on my Z4M and none of it fixed the 2nd gear feeling of lockout on fast shifts. The mounts may help, but I don't think it's ever going to shift like a 911. |
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07-27-2021, 01:18 AM | #11 | |
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But I really think swapping fluid is the first step.
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07-27-2021, 10:00 AM | #12 |
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Yeah I plan on swapping fluid...I had thought about removing the CDV, but read that it didnt fix the 1-2 lockout issue since it only slows down the clutch engagement, but not its release. I'm not particularly worried about NVH....the car will be my daily driver, but its more important function is to be competitive...so I'll take some discomfort for that haha.
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07-27-2021, 10:19 AM | #13 |
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All my MT woes were solved with the Auto Solutions Shift Kit.
I hated the stock set up and was thinking of selling the car due to occasional lock out and just the rubbery vagueness of it. Took a stab at the shift kit and all is well. I guess I'd start there or maybe the transmission mounts or both. |
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07-27-2021, 01:59 PM | #14 | |
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07-27-2021, 10:39 PM | #15 | |
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07-28-2021, 07:58 AM | #16 | |
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08-30-2021, 11:55 PM | #17 |
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I mainly track my OG M2 (2017), so I don't really ever shift fast from 1-2. This past weekend, I did a very soft roll-on launch from 1st gear, and shifted into 2nd at around redline and it just completely locked me out of gear/made an awful noise. This is the first time this has happened / honestly the first time I've ever shifted fast from 1-2. I have the Rogue Engineering trans mourns as well as the Turner poly rear shifter bushings, and while shift feel is improved, clearly not a remedy for this problem. I changed my trans fluid to BMW OEM about 3,000 mi ago, but thinking I might give the fluid a try. Not sure if the short shifter is worth the hassle of putting in..
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08-31-2021, 02:07 AM | #18 | |
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08-31-2021, 11:23 AM | #19 | ||||
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That's why I'm interested in the change in fluid, maybe that'll stop the issue.
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09-03-2021, 01:37 PM | #21 |
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Most M cars I've owned just don't like a super-fast 1-2 shift so I try to avoid it. CDV delete is a nice touch but doesn't really help with the 1-2 shift if you are really moving it quickly.
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09-08-2021, 11:45 PM | #22 | |
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