[stressdoc]

A lighter flywheel might help.

[wileecoyote]

Isn't this transmission shared with the M6? Are they having this problem?

[Sparta3223]

I am getting my clutch replaced soon but I dont want the factory clutch link me to where I can buy a new one

[533ogetnom]

Originally Posted by stressdoc

A lighter flywheel might help.

flywheel is on the motor side, wont help

[Sparta3223]

So does any one know where I can get a performance clutch?

[HyperM3]

Originally Posted by Sparta3223

So does any one know where I can get a performance clutch?

Yes, contact Rob at UUCmotorwerks. They have one.

[leftcoastman]

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.

[Sparta3223]

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

[HyperM3]

Originally Posted by Sparta3223

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

http://uucmotorwerks.com/ > About Us > Contact Us. Bro, you need to be a bit more resourceful.

[Sparta3223]

That company doesnt appear to have anything but a sway bar out for the 335i.

[HyperM3]

Originally Posted by Sparta3223

That company doesnt appear to have anything but a sway bar out for the 335i.

http://www.e90post.com/forums/showpo...2&postcount=25

[the.phelp]

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.

[Ado]

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

[Sparta3223]

Originally Posted by HyperM3

http://www.e90post.com/forums/showpo...2&postcount=25

I've seen that but its not on the website so how do I order it

[533ogetnom]

Originally Posted by the.phelp

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.

car def needs a lighter flywheel (not sure if its the flywheel or just the mass of the engine/backpressure/tranny) this car takes forever to spin down, but it would not effect the shifting :/

[chris b.]

Originally Posted by wileecoyote

Isn't this transmission shared with the M6? Are they having this problem?

the m6 has a specific trans for smg,not a convetional manual trans with some hydraulics bolted on to do the shifting like the e-46 m3.

almost everyone ive spoken to including me,have had some kind of shifting issue with the manual.

[Clem]

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!

[achien]

Originally Posted by Clem

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!

It's just the pressure getting to you.
Practice, practice, practice...

[dxb335d]

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:

[Clem]

Originally Posted by achien

It's just the pressure getting to you.

I wish that were it, but I miss second when there's nobody around. Either this thing doesn't like to be rushed or I just plain suck!

[ANILE8]

Originally Posted by 533ogetnom

like i just said it has nothing to to with the CDV, it has to do with the synchros, this is apparent because 1: the issue is between 1->2 2: the issue occurs when you try to shift the fastest 3: the issue is grinding, all of this = slow synchros

again the gearbox has nothing to do with the CDV just the clutch and its engagment.

a gearbox is conceptually two seperate spinning parts, one attached to the wheels and the other independant or attached to the engine (depending if the clutch is in or out)

when you go from 1st gear at say 6500 most of the gearbox mass which was connected directly to the clutch is spinning at a speed related to 6500 RPM, but for sake of argument lets pretend it spins at engine speed with no static gear reduction, the part attached to the wheels is spinning a little slower in relation to 1st gears gear ratio (but they are still connected directly)

to get the car into second the big mass of gears needs to slow down by a factor related to the change in gears between 1st and second, in our case about 40%. it needs to do this because the next gear is smaller and has a faster output turn then 1st gear, so in order to match the speeds up it need to rotate slower (and in conjunction the engine, but they are not connected while you have the clutch in)

so when you yank the shifter out of first and try to slam it into second something called a synchro is used, this basically slows the mass of gears down through friction to the same speed as the driveshaft

problem is depending on the synchro they can only slow the gears down so fast, and you yanking on the stick to push it into second is much faster than the synchro can handle. because of this the gearbox is still spinning faster than the driveshaft and you hear CRRIIICHHHH


note that this whole time the gearbox is detached from the engine and the clutch (well half of it) the only time the CDV comes into play is when you let your foot off the clutch, it slows the speed at which the clutch connects, this has nothing to do with the grinding you hear or difficulty engaging second


your car is not defective, you do not suck at shifting (atleast not because of this ), its a BMW engineering design issue.

there is not solution short of shifting sooner, slower, or ignoring the grinding (not the best of ideas)

i hope you have enjoyed this public service announcment.

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.

[scollins]

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.