3.09 FD LT Gear Ratio Build - BMW Luxury Touring Community
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post #1 of 12 Old Sep 25th, 2016, 7:17 pm Thread Starter
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3.09 FD LT Gear Ratio Build

I'm taking some pictures of the Final Drive I'm building to use at the Smoky Mountain Fall Reunion at the Iron Horse Lodge in Robbinsville North Carolina.

This is for my 2000 LT so I'll need to install the speed sensor ring on the taper bearing hub. I freeze the hub & remove the taper bearing. I use red Loctite when I install the speed sensor ring. It then sits on the press for 24 hours. Then I epoxy the ring to the hub.

I use EP lube on the taper bearing back lash spacer so the Loctite I use when I install the taper bearing can't stick to the spacer. After I reinstall the taper bearing it sits in the press for 24 hours. This is something I also do on all of my rebuilds.
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Dave Selvig
2004 Black LT
2000 Canon Red LT



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post #2 of 12 Old Sep 25th, 2016, 7:26 pm Thread Starter
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Re: 3.09 FD LT Gear Ratio Build

The next thing I have to do is machine the hole for the speed sensor, drill & tap the hole for the bolt that holds the speed sensor. I've had a friend do this for me before but I decided to make a fixture so I can do it myself. The fixture should be done tomorrow & the reamer for the hole will be here on Tuesday. The housing on the left is the GS 3.09 gear ratio that I'm converting for the 2000 LT.
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Dave Selvig
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post #3 of 12 Old Sep 26th, 2016, 1:13 am
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Re: 3.09 FD LT Gear Ratio Build

Dave, it's a pleasure to see your attention to detail.
A true craftsman at work.
Thanks for sharing.
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post #4 of 12 Old Sep 26th, 2016, 7:03 am
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Re: 3.09 FD LT Gear Ratio Build

Dave,

Dealing with a Simpleton here, what is the benefit for the conversion of gear ratio? Thanks!
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post #5 of 12 Old Sep 27th, 2016, 6:25 pm Thread Starter
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Re: 3.09 FD LT Gear Ratio Build

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Originally Posted by ProfSnape View Post
Dave,

Dealing with a Simpleton here, what is the benefit for the conversion of gear ratio? Thanks!
My 2000 LT came with a 2.75 ratio. I like how the lower ratio's start out in first gear better & the LT accelerates quicker with the lower gear ratio's. I've been using a 2.91 for highway riding & have used 3.20 & 3.36 gears in the mountains. This time I'm trying a 3.09 ratio. My 2004 LT that I use for my daily in town bike has a 3.09 gear in it.

Dave Selvig
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post #6 of 12 Old Sep 27th, 2016, 7:58 pm
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Re: 3.09 FD LT Gear Ratio Build

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Originally Posted by saddleman View Post
My 2000 LT came with a 2.75 ratio. I like how the lower ratio's start out in first gear better & the LT accelerates quicker with the lower gear ratio's. I've been using a 2.91 for highway riding & have used 3.20 & 3.36 gears in the mountains. This time I'm trying a 3.09 ratio. My 2004 LT that I use for my daily in town bike has a 3.09 gear in it.
Dave, what is the difference between the ring gear and pinion of the different sets? Does the ring gear have a different number of teeth, smaller, larger same? I expect the pinion has fewer teeth so does that make the ring gear thicker to account for the smaller diameter of the pinion? I don't remember if you have posted any side by side pictures of the different sets.

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post #7 of 12 Old Sep 27th, 2016, 8:36 pm Thread Starter
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Re: 3.09 FD LT Gear Ratio Build

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Originally Posted by bmwcoolk1200 View Post
Dave, what is the difference between the ring gear and pinion of the different sets? Does the ring gear have a different number of teeth, smaller, larger same? I expect the pinion has fewer teeth so does that make the ring gear thicker to account for the smaller diameter of the pinion? I don't remember if you have posted any side by side pictures of the different sets.
2.62 gear ratio = 34 tooth ring gear & 13 tooth pinion gear, 2.75 = 33/12, 2.82 = 31/11, 2.91 = 32/11, 3.0 = 33/11, 3.20 = 32/10, 3.36 = 37/11. The gear sizes also change.
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post #8 of 12 Old Sep 28th, 2016, 7:48 pm Thread Starter
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Re: 3.09 FD LT Gear Ratio Build

I got the sensor hole drilled & reamed tonight. I also machined the bolt hole pad for the sensor clearance to the sensor wheel, drilled & tapped it.
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post #9 of 12 Old Sep 28th, 2016, 7:58 pm Thread Starter
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Re: 3.09 FD LT Gear Ratio Build

I use Richie Wauters race car shop when I need to use a mill or lathe. I've known Richie for 28 years & work for him now & then.
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post #10 of 12 Old Sep 28th, 2016, 8:09 pm
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Re: 3.09 FD LT Gear Ratio Build

That is pretty handy to have.
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post #11 of 12 Old Sep 28th, 2016, 8:31 pm Thread Starter
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Re: 3.09 FD LT Gear Ratio Build

The ring gear on the left is a stock LT 2.75 the one on the right is the 3.09 I'm using in two weeks.
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Last edited by saddleman; Sep 28th, 2016 at 8:47 pm.
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post #12 of 12 Old Oct 14th, 2016, 4:07 pm
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Re: 3.09 FD LT Gear Ratio Build

That is a very good idea! I have always hated how tall first gear is, so what is the top gear rpm at 80mph? That would also be very good for two up riding. Are you making these for sale?

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