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Eye of the Toiger
 
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thinking of ditching the 915 for a 930

because I'm committed to a turbo build on my 993 ( i really want to do it) I'm thinking of selling my 915 and just putting in a 930 tranny.

I don't want to have to comprimise on HP here or there and rather than killing a perfectly good box I'm thinking a 930 box. i don't want to do a g50 conversion and hack into my car.

anyone done this how hard is it what are the HP limitations of the 930 box.
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Old 03-07-2010, 07:12 PM
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You'll need a short 76-77 930 trans.
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Old 03-08-2010, 12:02 AM
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I don't like my chances of finding one, any way to shorten them?
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Old 03-08-2010, 12:11 AM
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patrick motorsports have a shortened g50 that goes in without torsion tube mods. That's what I would be gunning for...
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Old 03-08-2010, 02:51 AM
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Quote:
Originally Posted by spence88mph View Post
patrick motorsports have a shortened g50 that goes in without torsion tube mods. That's what I would be gunning for...
does this require a conversion to hydraulic clutch though? What about the shift lever linkeage too.
The 4 speed box should be rated to handle large torque and hp so thats not a concern.
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Old 03-08-2010, 05:23 AM
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Quote:
Originally Posted by matty74 View Post
because I'm committed to a turbo build on my 993 ( i really want to do it) I'm thinking of selling my 915 and just putting in a 930 tranny.



anyone done this how hard is it what are the HP limitations of the 930 box.

As mentioned Patrick Motorsports can shorten a 930 ( call and ask which year works best). I had one shortened. I thought it was a 1982 when I sent it ( the price is more if they have to take it apart but so would it cost more to ship if sent in complete ). It turned out to be a 1988 transaxle which is a little more difficult( more$$$) however the price was still around $1000. You will also need the transaxle cross member modified or just get a new one from Patrick MS and a different throwout bearing. Porsche rates the HP to around 700 so a good trans should do the job for most higher HP builds.
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Last edited by voitureltd; 03-08-2010 at 06:09 AM..
Old 03-08-2010, 06:05 AM
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930 transmission

I have an excellent 1979 930 transmission for sale. Less than 2000 miles since rebuild. No gnashing/grinding/abuse.

EPS - Tucson
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Old 03-08-2010, 07:30 AM
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Quote:
Originally Posted by matty74 View Post
because I'm committed to a turbo build on my 993 ( i really want to do it) I'm thinking of selling my 915 and just putting in a 930 tranny.

I don't want to have to comprimise on HP here or there and rather than killing a perfectly good box I'm thinking a 930 box. i don't want to do a g50 conversion and hack into my car.

anyone done this how hard is it what are the HP limitations of the 930 box.
Are you going to be changing gear ratios?

If you do, and use aftermarket gears, be prepared for a fair amount of gear noise/whine.

T9
Old 03-08-2010, 07:36 AM
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My mate has a 930 box from a 78 which has a damaged bell housing, so I he said I can have it if I want, I just need a bell housing, do patrick sell for the 930?

is the internals the same for a 76-77 as is for a 78-89 box?

sticking with stock gears, don't mind the noise, I had a 4 speed 915 in my first car.

apart from side plate what can be done to toughen up the 930 even further?
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Old 03-08-2010, 01:58 PM
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Albins

Matt,

If you are considering changing gear ratios, talk to Albins in Ballarat. I fitted their close ratio gears for 2nd, 3rd and 4th and it totally transformed the car. Sacrificed a bit of highway economy and top speed, but well worth it, and not noisy. So much more fun to drive and by far the best bang for buck!

I wouldn't be surprised if they can also do the gearbox shortening mods.
Call them. Very helpful people.
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Old 03-08-2010, 07:37 PM
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Cheers for that Bill just sent them an email.

Matt
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Old 03-08-2010, 08:02 PM
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Amyone know if i can mate a 76-77 belhousing with 79 guts?

whats mods are required to fit a 79 930 box to a 74 911?
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Old 03-09-2010, 05:44 PM
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Quote:
Originally Posted by matty74 View Post
Amyone know if i can mate a 76-77 belhousing with 79 guts?

whats mods are required to fit a 79 930 box to a 74 911?
Well for starters the input shaft is longer on a post 78 ( of course a 79 also) and can be machined to be the right length to match the shorter bellhousing of the pre 78 930 transaxle. I am not a expert so more may be involved. I defer to Patrick Motorsports of Phoenix AZ who does this as a business and will have all the answers. Also they do the conversions and/or offer the parts to fit the 930 trans into a 914.
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Last edited by voitureltd; 03-10-2010 at 07:21 PM..
Old 03-09-2010, 07:42 PM
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Quote:
Originally Posted by matty74 View Post
My mate has a 930 box from a 78 which has a damaged bell housing,
What is the damage. Dose it have a limited slip.

It should be repairable and if you have it shortened it will take about an inch or so off the bell housing's length.
Old 03-10-2010, 07:23 AM
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I have a 4 speed from a 1987 930 with LSD. it was getting a little stiff into 2nd, and i think 3rd was starting to go too. So a few bits needed but otherwise it's a good box. I have all the 930 linkage and peddle box too, basically everything that would be removed from a 930 to fit a G50. I'm in the UK though so it may be prohibitive with carriage?
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Old 03-10-2010, 07:54 AM
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