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Missed shifts - 6MT
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05-16-2007, 10:34 AM | #45 |
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A lighter flywheel might help.
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05-17-2007, 03:23 PM | #50 |
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Yes, contact Rob at UUCmotorwerks. They have one.
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05-17-2007, 04:02 PM | #51 |
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I went back to the drag strip and no misshift issues. I surmise I'm a lot gentler on the 1-2.
With a 8500ft density altitude (6000ft absolute), I got a 14.05 at 102.5mph or so. 60 ft times of 2.07 or so. Stock runflats. The security guys forced me to get a helmet, since at 13.99 or less, you have to wear one. But realistically, I am not that interested in dragging and two times at the strip is probably enough. I was going to try to launch it in second on my last run. But then I was lined up against a very cocky G35, so I had to make sure I would destroy him. My boy burned out to warm up his tires - then ran a 16.8 ET. That should give you an idea of how the altitude affects us. Earlier in the evening, I ran against a modded STi. He looked SUPER PISSED after the run b/c while he technically beat me (0.027 faster ET), his trap speed was 5mph slower. Those things launch off the line but I reeled him in and passed him after 60mph. |
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05-17-2007, 05:39 PM | #52 |
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When I tried to pm rob it says he does not recieve private messages and I posted on his thread and he did not respond does anyone have any idea how to get in contact with this guy
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05-17-2007, 05:45 PM | #53 | |
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05-17-2007, 06:03 PM | #55 | |
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05-17-2007, 06:33 PM | #56 |
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Hey, all. Since I'm sitting here waiting for my 335 to finish prep at the dealer (which, they say, will take until next week ???), I figured I'd say "hi" to the community and offer my amateur mechanic thoughts on this shifter deal.
Maestro, I think that "two-click" feeling is (1) the syncronizing process occuring (baulk ring's cone clutch mating with the side of the gear to bring them to the same speed), then (2) the coupling sleeve sliding into engagement with the spines on the gear to engage the input shaft to the gear. Check out US Patent 4584892 on Google Patents for one type of syncro that I'd guess is not too far off from the BMW, at least with respect to basic functioning. (http://www.google.com/patents) It sounds to me like the shifting problem is a syncro problem, just like 533ogetnom said. If you find that you can lift off the clutch early to reengage as your shifting into gear (which can jog the baulk ring and allow faster spline alignment) then I'd think its the baulk ring itself. I've done this in my s2000 and other cars, and it works so well it sometimes feels like its pulling the gear the rest of the way in, but it often makes some noise, and even more often doesn't work. Of course, it sounds like BMW has made this pretty hard to do by putting that clutch valve in. Does anyone know if the 335 tranny is the same one that's on other lower-torque models? I wonder if BMW is trying to protect the tranny from the higher torque, and the higher loads it can put on the tranny (especially if you dump it hard into second). By the way, a lighter flywheel would drop the engine speed more rapidly between shifts, which could make the problem worse by further mismatching the input and output speeds. Of course, if the problem is that the engine speed is too high, a lighter flywheel might improve things, but I don't know if this is the case because I've never driven the car. I'm still sitting here patiently waiting for the dealer to get my delivered 335 ready for me to pick it up...very, very patiently waiting. Very calm. Veeeery calm. |
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05-17-2007, 08:50 PM | #57 |
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I have the same issue from 1st to 2nd, it's happened to me about 5 or 6 times.
luckily it hasn't happened to me in a race yet
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05-17-2007, 10:08 PM | #58 | |
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05-28-2007, 12:25 PM | #59 | |
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05-28-2007, 07:21 PM | #60 | |
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almost everyone ive spoken to including me,have had some kind of shifting issue with the manual.
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05-29-2007, 06:57 AM | #61 |
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I am prone to missing 2nd gear and yesterday was the worst. I'm lined up at a light with a new IS350 with some college boy driving. We take off easy and then hit it. I jump out in front - even with the 200 lbs. of scrambled groceries in the trunk. I go to rip 2nd gear and grrrrrrrrrr! He blows by me as I struggle to engage 2nd - maybe 2 cars ahead. Finally in gear, I play catch up. By the middle of the 3rd I'm back in front by a nose and let out. I've got to learn to shift this thing a little bit more deliberately.
Hate the shift action. Love the PROcede! |
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05-29-2007, 09:25 AM | #62 | |
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Practice, practice, practice...
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05-29-2007, 09:43 AM | #63 |
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i dont knwo the ft of the santa pod uk, but i did a 13.9 at 102 in a 335D!!!
there was 3 m3's there, 1 CSL m3 and none could beat me :rocks:
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05-29-2007, 03:00 PM | #64 |
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04-21-2008, 07:30 AM | #65 | |
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Thanks for taking the time to write this post. The best explanation I have seen regarding this very annoying issue of 1st > 2nd gear shifting. I have been reading many shifting problem threads, with nobody really knowing why this was happening. Looks like I will be shifting slower from 1st > 2nd. No big deal, nothing is perfect.
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04-21-2008, 12:15 PM | #66 |
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Digging up a thread that is almost an entire year old......
Anyway, I didn't bother reading the whole thread but I wanted to put in my experience with the missed 1-2 shift. Here is what I noticed happening when I missed it: The gear selector was actually hitting the notch for Reverse and hanging up the shift! I must have put a quite a bit of leftward pressure on the stick when I was shifting, partially opening the gate to Reverse and allowing the stick to hang up and prevent engagement of second gear. I tested this theory a few more times, and it does create a missed shift opportunity. It tends to happen when trying to shift fast, as you apply more force to the stick. So now I pay more attention to not putting any side forces on the stick and I haven't missed a 1-2 shift yet.
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