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08-31-2009, 05:05 AM | #199 |
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I'm getting my car back from the dealer today with the new tranny installed and I'll post my review of how it feels in a few days once I've broken it in. Hopefully this solves the problem, or else back to the dealer my car will go.
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08-31-2009, 07:37 AM | #200 |
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2008 M3 sedan with UUC SSK, same problem when trying to shift quickly. I've been racing for 10 years; this car has a slow second gear synchro - period.
Probably should double clutch 1/2 shift. |
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08-31-2009, 12:05 PM | #201 | |
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Agreed that the shifter isn't going to improve the gear synchros..... Good luck!
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08-31-2009, 04:35 PM | #202 |
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I've been experimenting and I find that the briefest pause will not induce a grind. It doesn't thrill me to have to baby the shift but then again, I'm not sure I want a dealer tearing the car apart over this either. I'll wait and see whether other transplants fix it or not.
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08-31-2009, 04:41 PM | #203 |
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Yeah you're right but my buddy is a master tech over at the bmw dealership and I'm going to show my SA the problem first. (if I can reproduce it) If not, I'll just installed the ssk and be happy with it!
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08-31-2009, 06:09 PM | #204 | |
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'The viscosity of the MTF-LT-2 (BMW's oil) is 37.7cSt @ 40°C and 7.4cSt @ 100°C, technically a 70W80. As you can see very close in viscosity and characteristics to the D4ATF, a 70W-80 GL-4. An SAE 70W-80 gear oil, previously referred to also as a 75W-80 is a broad viscosity range, both the MTL and the D4ATF will satisfy the requirements. It then comes down to which most closely matches the actual viscosity and characteristics of the original, obviously the D4ATF in this instance. As I mentioned previously the MTL can be used and certainly is used in some of these late model BMW transmissions with good results, it is just a higher viscosity. It is used in the previous "no label" transmissions and before that in the earlier BMW transmissions where an 80W GL-4 gear oil is called for and the primary basis for the reference.' For those having problems, it might be worth a try IMO. Hope this helps. |
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08-31-2009, 08:48 PM | #205 | |
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08-31-2009, 09:19 PM | #206 |
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09-27-2009, 04:00 PM | #207 |
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Any updates on the shifting with the new tranny installed. I am beginning to get frustrated enough to pull the the SSK and bring the car in. I have already swapped the fluid and it still did not fix the issue.
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09-27-2009, 06:48 PM | #208 |
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09-28-2009, 08:07 AM | #209 |
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I will ask the shop that put it in, as he didnt seem to want to divulge the secret. I am not sure what the brand is, but he did mention D4 if that means anything. He also put in some sort of friction modifier. The entire gearbox is alot smoother, but it still does not solve the 1-2 shift. Better yes, but not solved. On a side note the Lifetime BMW fluid is a joke as mine had 12,000 miles on it and looked horrible.
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09-28-2009, 09:17 AM | #210 |
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09-28-2009, 09:35 AM | #211 |
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The new tranny shifts great with no grind after having driven it 2000km. Mind you, I still pause a quick second between shifts but it hasn't grinded at all. I also installed the UUC SSK w/ DSSR and the shifts are a lot faster than before.
I wouldn't bring the car in with the non OEM fluid as I know for a fact that BMW will not warranty the tranny if has non OEM fluid in it.
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09-28-2009, 02:03 PM | #212 | |
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Finally, since BMW pays for service, they can probably demand OEM fluids, as MMorish said, so I'd follow his advice if you still plan to take it in. Oh, and I wouldn't consider a 1-2 grind a defect if it only happens when shifting gears very quickly. It's a quirk rather than a defect, and even a new tranny will probably still have the trait unless something changed internally, which you should be able to verify. Good luck man, and please keep us posted. |
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04-08-2010, 04:05 AM | #213 | |
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Some of us where having the same 1st > 2nd grind at high RPM problem on ZPOST with our Z4-///M's until MVF4Rrider shared the secret in THIS thread..
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By making this minor change to my driving style, when I want to I can now shift at the redline with confidence.
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04-08-2010, 04:26 AM | #214 |
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Also even if you are not changing from 1st > 2nd gear at high RPM, if you just apply the firm pressure to the left of the gear stick all the way through the shift you will feel how much smoother the shifting action is.
Try it and see.
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04-08-2010, 04:36 AM | #215 |
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Funny thing happened, I pulled out the car for the spring a few weeks back and I got a grind from 1st to 2nd gear, only this time at a low RPM... say 3k or so. I got it twice in 2 weeks. I figured it could be me being lazy with the clutch after driving an auto all winter or maybe the tranny wasn't warmed up enough. I don't know. Either way, it was at low RPM and both grinds were very quick.
Also, I've been applying a bit more pressure to the left of the shifter when doing a 1st to 2nd shift and it seems to be a bit smoother. I know these tranny's are strong and have CF synchros, but come on BMW, fix this!!
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04-08-2010, 04:43 PM | #216 | ||
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I'll take MVF4Rrider's advice on applying more pressure to the left when shifting from 1st to 2nd. Thanks for the heads up! |
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04-08-2010, 04:57 PM | #217 |
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I guess I am one of the lucky ones. I can shift as fast as I like with absolutely NO, NONE, Zippo, grind! No hesitation and can chirp into second without any drama. Although I did have the grind in my Mcoupe and hated it.
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11-21-2010, 03:05 PM | #218 |
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Have an '08 M3 092 and have noticed 1st-2nd under aggressive acceleration is very notchy. Occasional grind but it goes in. Have been driving MT's for 25+ years including 911, 046 M3 so I am pretty confident I know how to shift. My daughter's boyfriend just picked up a beautiful white/cinnamon 046 M3 with 30K on it. He is not as experienced a driver and was embarrassed that he was shifting poorly as he said at high RPM's the 1st-2nd gear shift grinds. Not sure how much might have been just inexperience so I took it out with him and with aggressive acceleration/shift it grinds like hell but goes into gear. Prompted me to come here to look as I had an identical M3 that sadly did not rack up much mileage as I was T-boned by an SUV and it was totaled. Has anyone had luck with any of the above mentioned solutions? Not sure how strong left pressure on the shifter will correct a problem. Car is fine until under aggressive/high RPM 1-2 shift. Everywhere else, not a problem. But the grinding is impressive. Anything other than anecdotal fixes? Any "formal" thoughts from BMW? Obviously nothing will be released for public consumption as it would spark a wave of dealer visits. Anything underground info?
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11-21-2010, 04:24 PM | #219 |
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Just discovered this thread and, while I don't have the 2008 E90 6MT anymore (replaced by a 2011 E90 DCT recently), I used to wonder about the notchy, grinding shifts from 1st to 2nd. But, whereas the majority of people seem to experience it when shifting at high RPM, mine used to do it at low RPM shifts. Each high RPM 1-2 shifts were fantastically smooth each & every time, but shifts at low RPM would often result in slight grinds & notchiness. Didn't even bother asking the SA or mechanics at the dealer where I got it from as they've proved themselves to be a bunch of incompetent numbnuts.
On a different, but possibly converse note, when I upshift (any gears) DCT at full throttle/redline, I hear a thunk and substantial movement under the car. This being my first DCT/SMG car, it's unexpected and I had imagined that that's how SMG is, and therefore, expected DCT to be totally smooth at redline upshifts... Last edited by OC3; 12-08-2010 at 05:00 AM.. |
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11-28-2010, 07:09 PM | #220 |
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It happens to me too, rarely. When asking an experienced mechanic he explained that when you you're bringing the engine speed to such a high rpm while your gear is engaged and then disengage and re-engage the syncros and gears will speed up faster than the engine speed between that shift (in our case 1-2).
After the gears and syncros are spinning so fast we try poping it into the next gear and then boom .. Grinding happens. To avoid this try to bring it through the rpm consistently don't bring it to 6k hold it then punch it and shift. Bring it through the rpms smoothly then pop it into the next gear leaving a split second between 1-2 gear. Hope that wasn't too confusing but basically it's engine speed vs. Gearbox speed.
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