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1980sc swap 915 for 930 short bell help

I have a 1980sc euro spec car that had a 964 turbo put in before I bought it. 420 plus horsepower. It still had the 915 open diff in it. Finding out much later, bad idea for big motor to start with... Live and Learn... The motor is being completely redone. Now bought a 930 short bell transmission to put in it. Have been told by experts the short bellhousing although expensive is the correct one to put in. Question is, can I use the same flywheel. It does have XDI twin plug ignition that runs off the flywheel presently in the car. They have a new SACHS clutch to put in and know they need to exchange for the 930 clutch now. But wanting to know if they can use the same flywheel that was set up with the XDI sensor? Any expert advise would be greatly appreciated...
Old 05-20-2018, 08:24 AM
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Hi dhadden,

I don't think the 911 flywheel will work with a 930 clutch. The 911 flywheel is 225mm dia and the 930 flywheel is 240mm dia. The 1980 used the nine bolt crankshaft doesn't it?, so the 1978-89 930 flywheel would probably work...but I'm no expert. 420 horsepower is alot for a 915 clutch.

Others will chime in ... let's see what they contribute.

Rahl
Old 05-20-2018, 07:56 PM
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Interested in the response, as I am in nearly the same situation.

dhadden, not to throw your thread into a tangent, but what axles will you use with this new set up? Going from 100mm flanges on the 915 to 108mm on the 930 gearbox?
If you have not chased that yet, I believe a set of late Carrera (86-89) axles will do the trick (fit the SC swing arm and mate to the 930 input flanges, depending on the year/style of the input flanges).
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Old 05-21-2018, 01:36 AM
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Sounds like a cool car. We need pix. I think you’re putting down to much power for a stock clutch
The good news is, your short bell tranny takes a way lighter clutch set up than the 78-88 boxes.
I’d get ahold of Chris at Tutbocraft. He’ll set you up.
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Old 05-21-2018, 06:37 AM
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Oops. I just read your post again. You’re looking for flywheel advice. I believe Raul is correct. I think you need a 240mm flywheel. Someone with a definitive answer will chime in soon I’m sure.
But not till we see pix;-)
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband
Wevo shifter, LSD. Next up, Cams, Heads and port work
Old 05-21-2018, 06:46 AM
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Turbo has a specific flywheel and clutch package.

I would think you would need a 9 bolt turbo flywheel and the 76/77 turbo clutch /Pressure plate. ring gear.

There are also turbo clutch packages aftermarket.
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Old 05-21-2018, 06:46 AM
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The flywheel is a nine bolt with 58 teeth for XDI sensor. they are going to try it to see how it fits up with the 930 shortbell transmission when it arrives. Will address that when time comes. Hope it works after all They are getting correct clutch and pressure plate and throw out bearing etc...
Old 05-21-2018, 09:06 AM
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The 915 flywheel and clutch would work hp/tq numbers aside. But you'll be spinning the clutch for sure, even a higher hp clutch like centerforce...
Your best bet is to mod the 930 flywheel to work with your ignition mods. It won't be as hard as dealing with this later..
Call chris at turbokraft
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Old 05-21-2018, 09:51 AM
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Quote "They are getting correct clutch and pressure plate and throw out bearing etc... "

Is this the 930 240mm clutch, pressure plate and throwout bearing or the 225mm 915 parts?

Rahlh
Old 05-21-2018, 11:04 AM
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They were ordering correct clutch etc for 1977 shortbell transmission. Question is can the 225mm flywheel work?
Old 05-21-2018, 11:14 AM
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Quote:
Originally Posted by dhadden View Post
They were ordering correct clutch etc for 1977 shortbell transmission. Question is can the 225mm flywheel work?
No, the register diameter is larger for the turbo.

My guess would be a custom pressure plate from Kennedy would be the best option.

The G50 3.2 ran the 240mm clutch....the same as the turbo.
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Old 05-21-2018, 01:10 PM
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Parts list -- all 240mm Turbo parts:

1979-88 flywheel, 9-bolt
+ machine flywheel for 60-2 ignition timing pattern -- we can do that for you

+ pilot bearing
+ flywheel bolts
+ rear main seal, Viton -- not that piece of cr@p hard plastic one that Porsche is selling

1976-77 Turbo aluminum pressure plate
==> since you're making 420hp, it's advisable to install the stronger "Ruf" pressure plate from Sachs Race Engineering. Not cheap, but worth it: pedal action is smooth, effort is like all stock

1976-77 Turbo clutch disc -- standard organic friction surface, spring hub disc

1976-88 930 release bearing

1976-77 starter ring gear

All parts come balanced by their manufacturers, so just bolt-in and go.
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Old 05-21-2018, 03:01 PM
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Hi Chris,

Is the stronger "Ruf" pressure plate from Sachs Race Engineering appropriate for a 930 engine making less than 350 wheel HP?

Thanks,

Rahl
Old 05-21-2018, 07:27 PM
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Chris what is the price of those parts?
Old 05-21-2018, 09:57 PM
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Quote:
Originally Posted by TurboKraft View Post
Parts list -- all 240mm Turbo parts:

1979-88 flywheel, 9-bolt
+ machine flywheel for 60-2 ignition timing pattern -- we can do that for you

+ pilot bearing
+ flywheel bolts
+ rear main seal, Viton -- not that piece of cr@p hard plastic one that Porsche is selling

1976-77 Turbo aluminum pressure plate
==> since you're making 420hp, it's advisable to install the stronger "Ruf" pressure plate from Sachs Race Engineering. Not cheap, but worth it: pedal action is smooth, effort is like all stock

1976-77 Turbo clutch disc -- standard organic friction surface, spring hub disc

1976-88 930 release bearing

1976-77 starter ring gear

All parts come balanced by their manufacturers, so just bolt-in and go.
(83 SC Cab) Im in the middle of doing exactly as Chris has advised + a ton of other mods.



Old 05-22-2018, 03:42 AM
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This is a picture of my car. It had narni wheel abd stick. New leather oem seat covers. rear seat delete. short shift
Old 05-22-2018, 04:02 AM
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1980 sc with 420 plus hp 91 965 motor




Old 05-22-2018, 04:48 AM
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Will post pictures of the Narni wood wheel and stick. it also has the nicer painted wheel hub caps that bring out some color in it. very tight car. can't wait to get it back on the road.

Last edited by dhadden; 05-22-2018 at 04:57 AM..
Old 05-22-2018, 04:51 AM
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Quote:
Originally Posted by BURN-BROS View Post
No, the register diameter is larger for the turbo.

My guess would be a custom pressure plate from Kennedy would be the best option.

The G50 3.2 ran the 240mm clutch....the same as the turbo.
Thanks! Kennedy is on the list to mod the flywheel!
Old 05-22-2018, 08:59 AM
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Id love to stay in touch with you 965 motor guys. My father in law was nearing the completion of installing a 965 engine in an 83 cab when he passed away last October. I know he was chasing some electrical issues around the fuel pumps but I really dont know when my mother in law will be ready to get into the garage again...
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Old 05-22-2018, 12:27 PM
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