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Join Date: Nov 2006
Location: Conway,AR
Posts: 1,203
G50 trans for a 930

I am thinking about putting a g50 trans in my 85 930. I know I will need to modify the torsion bar tube and change the pedal assembly for one with a hydraulic clutch master cylinder. My question is about the actual g50 trans itself. Do I need a g50 from an 87-88 911 or will a trans from a 964 work also? Are the trans cases different? Do they require a different flywheel and clutch? Any additional information would be appreciated. Thanks,

Tom
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1972 911T (with 3.2), 1985 930-EFI Conversion (in progress), 2002 Turbo X-50
Old 12-18-2013, 12:28 PM
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Join Date: Mar 2008
Posts: 166
Almost six months later , but I will try to help :

You have two options here :

Cutting you torsion bars tube , install coilovers and using an unmodifed G50 with 87-89 G50 end cover with stock G50 clutch.

Shorten the bellhousing and the mainshaft -28mm , retain stock torsion bar suspension , using 930 3.0 flywheel / clutch combo but also 87-89 end cover need to be used.

An 87-89 G50 /00/01 is the easiest swap as it has the correct end cover.
G50 /03 /05 from an 964 can also be used but the end cover and the shifter rod need to be changed for 87-89 parts
An non turbo G50 will hold the power of an 930 but if you like to abyse it or you have higher HP levels then it is best to use an Turbo G50 /50 or 52

Also you need to use the G50 shifter and the shifter rod as well.

Good luck,
Jim
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Old 06-28-2014, 06:44 AM
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Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
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I'd like to add that it's my understanding that the 87-89 911 G50/00/01/02's will take whatever power you throw at it, it's the diff cover you want to go with a billet cover due to ring gear to pinion deflection.

I've had the stock cast cover on mine forever making 500-600hp and no problems.
Old 06-28-2014, 07:30 AM
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Join Date: Jul 2006
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I think you also need to change out the 930 pedal cluster with a G50 car cluster so you can add the clutch master cylinder. The G50 clutch is operated with hydraulics while the 930 clutch is cable operated.
Old 06-28-2014, 11:02 AM
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Scottsdale Arizona USA
 
Join Date: Mar 2010
Location: Scottsdale, Arizona USA
Posts: 341
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Hi Tom,

The guys here above have done well summarizing. Cutting the torsion tube on the chassis would be necessary with any 89- gearboxes. The 87-89 G50 in the "SBH" config is the solid choice. Gearbox, pedals and shifter all needed. After that conversion machineworks and parts. If you plan on racing, pushing 500+ Tq or for better long term reliabilty, reinforced parts and cooler recommended. Some info and parts detail cand be found here:

Transmission > Porsche G50 SBH (Short Bell Housing) By Patrick Motorsports Mid Engine Performance Specialists

I work with Patrick MS so do many if these and happy to share or answer any questions.

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Old 06-28-2014, 12:46 PM
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