Where is our gearbox from?

[danielbreese]

Our beloved 1Ms are " parts bin specials". I've never heard where the gearbox came from-anyone know?

Thanks

[flzrider]

Standard 6-speed manual from N55 powered 135i's.

[Lester]

Part 23007599342 (Rmfd-6 speed gearbox) was found on the following vehicles:

E82: Details on E82
E82 135i Coupé, Europe
E82 M Coupe Coupé, Europe


E88: Details on E88
E88 135i Convertible, Europe


E90N: Details on E90N
E90N 335i Saloon, Europe


E91N: Details on E91N
E91N 335i Touring, Europe


E92N: Details on E92N
E92N 335i Coupé, Europe


E93N: Details on E93N
E93N 335i Convertible, Europe


F10: Details on F10
F10 535i Saloon, Europe


F11: Details on F11
F11 535i Touring, Europe

[PunjabiM3]

Quite amazing. I find the gearbox in the 1M to be better than the one I had in my e92 M3. Both suck compared to a P-car's gearbox however.

[1SerieStud]

Originally Posted by PunjabiM3

Quite amazing. I find the gearbox in the 1M to be better than the one I had in my e92 M3. Both suck compared to a P-car's gearbox however.

My friend who owns an e92 M3 has complained in the past about his manual 6-speed transmission. I've rowed the gears on his M3 before and they definitely don't engage as smoothly and precise as the ones on my 1M.

[-cj-]

Originally Posted by 1SerieStud

My friend who owns an e92 M3 has complained in the past about his manual 6-speed transmission. I've rowed the gears on his M3 before and they definitely don't engage as smoothly and precise as the ones on my 1M.

The shifting IS nice on the 1M, however it has a bad habit of wanting to slip into 2nd gear. I've never had this issue on any of my previous cars, so this worries me... I've slipped it into 2nd gear 3 times now. Never at high speed, but the whole "money shift" thing worries me...

[1SerieStud]

Originally Posted by -cj-

The shifting IS nice on the 1M, however it has a bad habit of wanting to slip into 2nd gear. I've never had this issue on any of my previous cars, so this worries me... I've slipped it into 2nd gear 3 times now. Never at high speed, but the whole "money shift" thing worries me...

Strange, not mine. In fact, many people with these cars have to adapt to the transmission because shifting into second gear takes a little practice and finesse - I highly doubt that the car's gearbox favors 2nd versus 4th. You may want to get your car checked.

[ozinaldo]

+1. Never happened to me, sounds strange.

[-cj-]

Part of me wonders if it's the oil they incorrectly installed on my transmission. When I went back, they had the same invoice for me, with updated part numbers. I'm wondering if they bothered to change out the fluid and just updated the invoice to look like they did? How can they prove it, now? I'm giving them the benefit of the doubt.

Basically when I go to shift into 4th from 3rd, I get a slight hesitation and bam, it slips into 2nd. The 1st time I did it, I downshifted from 5th into 2nd on the highway, no big deal other then the surprise. RPMs climbed up to 6k before I clutched in and corrected. I wasn't going very fast, otherwise that would have been a very bad situation.

2nd time, I felt the car slow down and immediately corrected. I was going much slower this time and the rpms barely moved (I just felt the car decelerate since I didn't blip the throttle unlike the first time this happened). The 3rd time, I just felt it do it and I didn't even release the clutch.

I'm surprised by the frequency. I've never had this issue with any of my cars.

I will have to start using proper shifting technique again. I grip the shifter from the right side when shifting into 4th. I should have my hand on the left side of the shifter (Steering wheel on the left side).

Like this: http://blogs.superstreetonline.com/1...que/index.html

Edit: Sorry for the thread jack!

[RimasRS]

Originally Posted by -cj-

The shifting IS nice on the 1M, however it has a bad habit of wanting to slip into 2nd gear. I've never had this issue on any of my previous cars, so this worries me... I've slipped it into 2nd gear 3 times now. Never at high speed, but the whole "money shift" thing worries me...

Once again look for CDV delete you will be fine even happy

[-cj-]

Originally Posted by RimasRS

Once again look for CDV delete you will be fine even happy

Thanks for the suggestion. You're talking about the "Clutch Delay Valve" right? How does it help eliminate the tendency to want to drop into 2nd? From the 5 minutes I spent reading up on it, it seems better suited with applying power quickly if you "drop the clutch"?

[Artemis]

Originally Posted by danielbreese

I've never heard where the gearbox came from-anyone know?

Smoothest so far, no hiccups. To me, it's from this place.

[Die ///M Rakete]

+1 Has never happened to me either. Could you have a bad example of the tranny?

[1SerieStud]

Originally Posted by -cj-

Thanks for the suggestion. You're talking about the "Clutch Delay Valve" right? How does it help eliminate the tendency to want to drop into 2nd? From the 5 minutes I spent reading up on it, it seems better suited with applying power quickly if you "drop the clutch"?

What he is suggesting doesn't help what-so-ever and obviously has nothing to do with the engagement of gears (their location). I would ignore his suggestion, specially since you'll probably end up taking it back for warranty work and the first thing that will possibly happen is the dealer may blame the issue on the CDV-nonsense.

Also, when shifting from 3rd to 4th, your hand shouldn't really be on either side of the shifter, instead it should be in front of the shifter and pushing it straight back towards the rear of the car. When no gears are engaged and the shifter is sitting in the center of its pattern, if you you were to pull straight back it would engage 4th gear. Only 2nd and 6th require any lateral movement.

Lastly, if the dealer did not change the fluid, you're pretty much on the same boat with the majority of us, so no, that shouldn't be a reason for what you're experiencing. My guess is: either you need to polish your driving skills (most likely the reason), or there is a problem with your transmission.

[Redadair]

While the Gear Box Case in the 1M is shared by many other BMW's it's Syncros in 1st and 2nd are of a brand new material for the 1M.

This gear box is So much Smoother shifting than my 2007 335i's was, especially from 1st to 2nd shift. My 335i could not be rushed into 2nd gear no matter what I did.

[-cj-]

Originally Posted by 1SerieStud

What he is suggesting doesn't help what-so-ever and obviously has nothing to do with the engagement of gears (their location). I would ignore his suggestion, specially since you'll probably end up taking it back for warranty work and the first thing that will possibly happen is the dealer may blame the issue on the CDV-nonsense.

Also, when shifting from 3rd to 4th, your hand shouldn't really be on either side of the shifter, instead it should be in front of the shifter and pushing it straight back towards the rear of the car. When no gears are engaged and the shifter is sitting in the center of its pattern, if you you were to pull straight back it would engage 4th gear. Only 2nd and 6th require any lateral movement.

Lastly, if the dealer did not change the fluid, you're pretty much on the same boat with the majority of us, so no, that shouldn't be a reason for what you're experiencing. My guess is: either you need to polish your driving skills (most likely the reason), or there is a problem with your transmission.

Regarding the fluid, my dealer DID change it, but used the wrong fluid. I called them out on it and they fixed it the next day. But I'm wondering if all they did was update the invoice to show what I wanted it to initially show and didn't actually fix the fluid issue.

I'm being more aware of my hand placement, to see if it's me. It almost seems like it gets sucked into 2nd gear in certain situations. I'll give it a few weeks and see if anything changes.

Keep in mind, I've *never* miss-shifted on a downshift on any of my other cars.

[Redadair]

Originally Posted by -cj-

Regarding the fluid, my dealer DID change it, but used the wrong fluid. I called them out on it and they fixed it the next day. But I'm wondering if all they did was update the invoice to show what I wanted it to initially show and didn't actually fix the fluid issue.

I'm being more aware of my hand placement, to see if it's me. It almost seems like it gets sucked into 2nd gear in certain situations. I'll give it a few weeks and see if anything changes.

Keep in mind, I've *never* miss-shifted on a downshift on any of my other cars.

You do realize if you let go of the shift knob while in neutral on essentially any Manual Trans it auto aligns to the 3rd and 4th gear shift gates. So to hit 2nd you must move the lever to the left into the 1st and 2nd gear gates, then pull down.

To avoid this just pull into neutral, let go of the knob momentarily and then slide straight up or down for 3rd or 4th.

Not trying to be a smart ass just pointing out the obvious.

[-cj-]

Seriously guys... this is far from my first manual car. I've been driving manual for like 16 years. NONE of my cars have done this. Like I said, I'm watching my hand placement from now on, but if it IS me, why is this car so sensitive.

[-cj-]

I think I've found a pattern to it. When I'm in 5th gear, and I'm downshifting into 4th, if I blip the throttle before dropping it into 4th, it almost seems like it gets sucked into 2nd gear. I have to try to replicate this tomorrow on my road trip. It happened again today, but I'm not 100% sure it was in 2nd, because it felt odd and I pulled it out and put it into 4th (Without releasing the clutch), so I can't confirm 100% it was in 2nd gear........... I'm now starting to wonder if it isn't poor hand placement and something is going on.

[RimasRS]

Originally Posted by -cj-

I think I've found a pattern to it. When I'm in 5th gear, and I'm downshifting into 4th, if I blip the throttle before dropping it into 4th, it almost seems like it gets sucked into 2nd gear. I have to try to replicate this tomorrow on my road trip. It happened again today, but I'm not 100% sure it was in 2nd, because it felt odd and I pulled it out and put it into 4th (Without releasing the clutch), so I can't confirm 100% it was in 2nd gear........... I'm now starting to wonder if it isn't poor hand placement and something is going on.

maybe your shifter adjusted somehow not in a right way. There was some post of Dackel about bmw performance quick shifter with some measurements maybe that can help you out.
Talking about CDV you can buy modified which will not void your warranty it looks like original part.

[rapter]

Originally Posted by 1SerieStud

Strange, not mine. In fact, many people with these cars have to adapt to the transmission because shifting into second gear takes a little practice and finesse - I highly doubt that the car's gearbox favors 2nd versus 4th. You may want to get your car checked.

I spoke to the BMW engineers about the ease of 2nd gear engagement and this is what they had to say.

in order to make a more robust gear, that will take take the abuse of spirited drivers, they have intentionally upgraded and beefed up the syncro- mesh of the 2nd gear. While this does affect shifting comfort it will prolong the life of the gear box.

I am happy to trade a little shift comfort for this reason. The rest of the gears area amazingly smooth!

[Dackelone]

Originally Posted by danielbreese

Our beloved 1Ms are " parts bin specials". I've never heard where the gearbox came from-anyone know?

Thanks

The 1M uses the SAME trans as a N55 135i uses. It is made by ZF.



1M engine: GS6-34BZ-THD4
N55 engine: GS6-45BZ-THD4
N54 engine: GS6-53BZ-TJGK

N51/N52/N52K: GS6-17BG or GS6-37BZ
(128i)



Designation is as follows:

G = transmission
S = manual
6 = 6 forward gears
17 = I-transmission, 37 = H-transmission, 53 = G-transmission
B = petrol/gasoline gear ratio
Z = manufacturer is ZF, G = manufacturer is Getrag


Also... the shifter throws are as follows:

1M = ? (I suspect 70 mm's)
N55 = 70 mm's
N54 = 80 mm's
N54 w/Performance SSK = 55 mm's

N51/N52/N52K = ? mm's ???