05 Trans Ratios - BMW Luxury Touring Community
 
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post #1 of 17 Old Mar 1st, 2013, 6:32 am Thread Starter
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05 Trans Ratios

Does the 05 have a lower ratio in high gear than the previous trannies? It seems like the ratio is not very high when shifting compared to the lower gears. It's seems like it could use a higher gear ratio in 5th..............

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post #2 of 17 Old Mar 1st, 2013, 6:43 pm
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Re: 05 Trans Ratios

Here they are:

Pre 05 Post 04

1 3.864 3.85
2 3.022 3.022
3 2.393 2.393
4 1.819 1.827
5 1.511 1.523

John
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post #3 of 17 Old Mar 2nd, 2013, 4:55 am
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Re: 05 Trans Ratios

Interesting numbers John, I wonder what the actual gear teeth numbers are, as for the differences in the ratios for first and fifth to be that miniscule I would think a large number of teeth would be required (to get such a small difference).

Dennis
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post #4 of 17 Old Mar 2nd, 2013, 6:21 am
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Re: 05 Trans Ratios

Quote:
Originally Posted by jzeiler
Here they are:

Pre 05 Post 04

1 3.864 3.85
2 3.022 3.022
3 2.393 2.393
4 1.819 1.827
5 1.511 1.523
Technically John, it sounds like your headings are mixed up. If it was accurate, then what you're saying is there is a period of time between 04 and 05 where they could have either combination of ratios. Is this in fact correct?

Jeff
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prior:
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post #5 of 17 Old Mar 2nd, 2013, 10:57 am
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Re: 05 Trans Ratios

Quote:
Originally Posted by bikerj
Technically John, it sounds like your headings are mixed up. If it was accurate, then what you're saying is there is a period of time between 04 and 05 where they could have either combination of ratios. Is this in fact correct?
Not really 1999-2004 is pre 05 and 2005-2009 is post 04. Where is the gap?

But I did wrestle with if that helps.

John
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But lack DE, MA, RI and CT with the 2005 LT

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post #6 of 17 Old Mar 2nd, 2013, 11:02 am
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Re: 05 Trans Ratios

Quote:
Originally Posted by K100Dennis
Interesting numbers John, I wonder what the actual gear teeth numbers are, as for the differences in the ratios for first and fifth to be that miniscule I would think a large number of teeth would be required (to get such a small difference).
Start counting...
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John
2009 K1300GT Red Rocket
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2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #7 of 17 Old Mar 2nd, 2013, 12:48 pm
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Re: 05 Trans Ratios

I wonder how hard it would be for someone to change the ratio, such as for the fifth gear by installing a custom gear, or would more than one have to be changed?
I'm guessing the diameter of the gear would be the main dimension to figure out, besides the number of teeth.

Jeff
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prior:
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post #8 of 17 Old Mar 2nd, 2013, 6:40 pm
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Re: 05 Trans Ratios

It looks like there is room for changes to ratios except for 1st and 2nd. Not enough room for a lower first and second is trapped in the case machining.
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John
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post #9 of 17 Old Mar 2nd, 2013, 11:44 pm
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Re: 05 Trans Ratios

Yes, that's what we all need, a lower first gear, but unfortunately it isn't possible. If it were possible most of our clutch woes wold be gone. K100's never suffered from clutch burning like the K12's, and you could ride a trials section in first.

Dennis
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post #10 of 17 Old Mar 3rd, 2013, 7:33 am Thread Starter
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Re: 05 Trans Ratios

The reason I asked is because when I blip the throttle to downshift to 4th it seems the engine is way ahead of the gear change. When I blip it in the lower gears it seems to mesh right up when I release the clutch. I don't remember it being like that on the 03. Maybe it's just me.........

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post #11 of 17 Old Mar 3rd, 2013, 1:47 pm
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Re: 05 Trans Ratios

Wasn't there a gear ratio change in the FD as well? I wonder what the effect would be to swap out an early and late model FD, realizing this would require some machining on the case. John? Anybody else?


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post #12 of 17 Old Mar 3rd, 2013, 3:15 pm
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Re: 05 Trans Ratios

Quote:
Originally Posted by deanwoolsey
Wasn't there a gear ratio change in the FD as well? I wonder what the effect would be to swap out an early and late model FD, realizing this would require some machining on the case. John? Anybody else?
The difference on a 2000 LT & a 2004 LT with the different ratios is the 2000 LT runs about 300 rpm less in 5th gear.

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post #13 of 17 Old Mar 3rd, 2013, 4:04 pm
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Re: 05 Trans Ratios

I was just thinking in terms of the 2.62 ratio vs the 2.75 in the older units. I'm not experienced enough to know if that would feel like much of a difference to the driver.

The reason I brought it up is that some Honda VTX 1800 riders use a FD from a VTX 1300 because of the gear ratio difference between the two. Apparently the two will swap out on the VTXs.


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post #14 of 17 Old Mar 3rd, 2013, 5:13 pm
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Re: 05 Trans Ratios

The LT could definitely benefit from a lower first and a taller fifth gear. Common John I'd be the first to buy it when you figure out how to do it.
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post #15 of 17 Old Mar 3rd, 2013, 8:51 pm
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Re: 05 Trans Ratios

Quote:
Originally Posted by norton
The LT could definitely benefit from a lower first and a taller fifth gear. Common John I'd be the first to buy it when you figure out how to do it.
I agree 100%. The too tall first gear is my biggest complaint about the LT by far. The too short 5th is somewhat of a nuisance, but not nearly as big a pain as the too tall first combined with a dry clutch. Dumb design choice by BMW.

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post #16 of 17 Old Mar 3rd, 2013, 10:50 pm
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Re: 05 Trans Ratios

I agree, I'd really like a lower first gear, but it requires a physically larger diameter driven gear and as John Z states, there isn't sufficient space within the standard casing to allow it. However, it may be possible to weld and machine the gearbox casing to provide the required clearance, but someone would need to be real keen to take on such a project. Plenty of engineering shops specialise in gear manufacture, so that wouldn't be a show stopper. For the Aussies, google Carr Gears as an example. A sacraficial gearbox is what is required.

Dennis
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post #17 of 17 Old Mar 4th, 2013, 11:43 am
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Re: 05 Trans Ratios

Quote:
Originally Posted by norton
The LT could definitely benefit from a lower first and a taller fifth gear. Common John I'd be the first to buy it when you figure out how to do it.
If first gear is good up to about 62, why would you want a taller 5th? The only time I am in 5th is on the interstate.

John
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2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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