Another gearbox option

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minorv8
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Another gearbox option

Post by minorv8 » Mon Dec 02, 2019 10:19 am

Here are some pics showing a BMW 6-speed box that got adapted to RV8. This will be fitted to my new engine (that is still being assembled…).

The main parts are Getrag GS6-37 box and P38 auto bellhousing. Clutch is a Sachs 240 mm 765 diaphragm and ACT 240 plate.
Loota_2.jpg
Attachments
Leikelty kytkinkoppa.jpg



minorv8
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Re: Another gearbox option

Post by minorv8 » Mon Dec 02, 2019 10:22 am

Is it just me and my lack of Computer skills or why I keep on having the attached photos diasppearing when they are placed inline …

Anyway, a pic of clutch:
Attachments
Kytkin.jpg

minorv8
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Re: Another gearbox option

Post by minorv8 » Mon Dec 02, 2019 10:33 am

And the end result:

Converted box.jpg
So why such a conversion ? Well, currently I have a TR7 derived LT77 that has survived behind a healthy 4.6. I do have a rebuilt R380 but both have the same ratios and I would prefer to have 1st gear around 2.90:1 number like T5. Now, T5 boxes and matching bellhousing are not exactly cheap.

Now, we have a local source that has converted BMW boxes to a lot of different engines. All you need to provide is a bellhousing (and a block if your engine is a new to him). He has a stock of boxes or you can supply your own. I bought mine from Germany (50 € + shipping 80 €), bellhousing from UK (£50 + shipping) and the actual labour (around 400 €). Being a diesel box the 1st gear is useless at 5.1:1 but others are what I needed. Clutch parts are all heavy duty BMW and there are plenty to choose from.

Total length flange to flange is about 1 1/4" less than LT77. Gear stick is very close to LT77 location with the matching BMW gear Shift assembly.

DaveEFI
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Re: Another gearbox option

Post by DaveEFI » Mon Dec 02, 2019 1:29 pm

I've often wondered about this as regards the SD1. The T5, etc that seems to be a favourite there seems nothing like as sweet to use as the box in my brother's noughties BWM. When seems to have near zero value as scrap, meaning parts should be cheap.
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stevieturbo
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Re: Another gearbox option

Post by stevieturbo » Tue Dec 03, 2019 6:11 pm

5.1 first ??? holy feck, never heard of one that short.

Although most BMW cars do tend to run a 1:1 6th or top gear with a very tall diff instead.

Always think this video is cool...

9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

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ChrisJC
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Re: Another gearbox option

Post by ChrisJC » Tue Dec 03, 2019 7:15 pm

Impressive machining!

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Series IIA 4.6 V8
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Re: Another gearbox option

Post by SuperV8 » Wed Dec 04, 2019 10:35 am

Interesting, what is the weight like vs the LT77?

So the Getrag GS6-37 box has a torque rating of 370Nm?
Gear ratios (37BZ for gasoline-powered engines):
1 2 3 4 5 6
4.350 2.496 1.665 1.234 1.000 0.851

Gear ratios (37DZ for diesel-powered engines)
1 2 3 4 5 6
5.14 2.83 1.79 1.26 1.00 0.83
Dax Rush 4.6 supercharged V8 MSII

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Re: Another gearbox option

Post by DaveEFI » Wed Dec 04, 2019 12:46 pm

A real crawler 1st on the diesel version. Very useful when towing. If reverse is equally as low.
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Re: Another gearbox option

Post by minorv8 » Thu Dec 05, 2019 5:30 pm

Getrag weighs 45 kg with gearshift assy. I only had R380 to weigh and it was 49 kg without bellhousing and remote.

That lathe video is scary, I have also seen one where they cut an auto box.

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