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914-6Werkshop
 
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930 shifts pretty similar to a 915. Introduced in '76. A good 915 isn't vague and sloppy.

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Old 06-19-2019, 04:50 AM
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I have a rebuilt 915 with a WEVO and another car with a 930 box. It’s not an apples to apples comparison. I would say that the 930 more deliberate “1 Mississippi” shifts. The biggest difference is how LONG the gearing is on the 930. So, if you like rowing through gears, the 915 is better suited. If cruising is your deal, the 930 works quite well. I like both but they do drive differently.
Old 06-19-2019, 05:21 AM
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Quote:
Originally Posted by 30westrob View Post
I question weather a 3.2 with added turbo making north of 450 whp will outlast the trans. Anyone care to comment. Rob
Easily. A 3.2 is basically a 930 engine on the low-end.
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Old 06-19-2019, 12:30 PM
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And a Porsche engine is almost an aircraft engine. Aircraft engines are designed to put out 75% of the rated power, indefinitely. I posted a vid of a 935 engine on the dyno recently. The question about turbos comes in the “how long do you want your fuse” question. I wouldn’t worry about the bottom end. It’s the top end that will take the brunt of the fury of high BMEP. It will be spectacular.
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Old 07-17-2019, 09:52 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #24 (permalink)
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Quote:
Originally Posted by Tippy View Post
Easily. A 3.2 is basically a 930 engine on the low-end.
Which is also this:
https://youtu.be/wPfK_BispVo

or this:

https://www.youtube.com/watch?v=jtvLtkGHTjI&feature=youtu.be
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"Easy, easy, this car is just the right amount of chitty"
"America is all about speed. Hot,nasty, bad ass speed."
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Last edited by ClickClickBoom; 07-18-2019 at 05:42 PM..
Old 07-17-2019, 09:54 PM
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There's always this possibility, easier than to modify 930 long bellhousing to short and outcome is better. Cheaper too.

Budget gearbox
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Old 07-17-2019, 10:51 PM
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Get a long bell 78 -88 and have it shortened. Don't forget to shorten the main shaft too I have a couple of short main shafts laying on a shelf.

People want a mint for the short bellhousing 930 boxes these days. 930 boxes are great stock until you hit 4th gear then all you hear is silence as those long legs unwind. I always found the first a little short and the 4th too long.

I run an IX 19:33 in my 935 and I can ring it out to about 88 mph in first gear then it is just like having a 5 speed unless there is a really slow corner
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Old 07-18-2019, 12:14 AM
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Quote:
Originally Posted by clutch-monkey View Post
Curious to know also- have heard conflicting details
Side plates, the aftermarket plate is needed for big HP.
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Old 07-18-2019, 08:06 AM
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Not all 930 boxes can be shortened; apparently the later ones don't have solid webs, so cutting the bell housing down doesn't work too well.
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Old 07-18-2019, 11:22 AM
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I always question when people say the 915 will hold up to 350hp when many a 915 don't hold up to 180hp #confused face.

My current 915 rebuild costs have me reconsidering adding a turbo to my car... I don't want that bill again.
Old 07-18-2019, 02:06 PM
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Quote:
Originally Posted by Geronimo View Post
I always question when people say the 915 will hold up to 350hp when many a 915 don't hold up to 180hp #confused face.

My current 915 rebuild costs have me reconsidering adding a turbo to my car... I don't want that bill again.
Build a 915 properly with the right strengthening bits (side cover, retainer plate, LSD) and treat with some care and they can last pretty well with ~350 ft/bs at the rollers. You could still break it in a heartbeat - just add stupid - and the clutch feels like a leg press after a few minutes in traffic - but they can hold up.

On the other hand, bolting up an already-worn & non-strengthened 915 - especially an older, weaker, type - to a turbo will just hasten the inevitable demise. It'll go downhill fast, with stock-ish 930 power (330 FWHP).

Doing that is also a recipe for ending up with a comprehensively trashed 915 with little left worth keeping; blued gearsets, spun bearings etc...

I'm told the factory put internal spray bars on every gearbox they ever built for racing. Even though the pump robbed significant HP on cars that made 180HP or so. Apparently, it really helps to keep the oil temps under control and spray it where needed...
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'77 S with '78 930 power and a few other things.
Old 07-18-2019, 04:56 PM
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Isn't a 930 gearbox really expensive? I figure it would be more than a G50 or at least the same, if so I would choose a G50 in a heartbeat.
The 930 with stock gearing isn't very fun.
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Old 07-19-2019, 05:20 AM
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I found a 930 gearbox that had been rebuilt and shortened for my SC/930 conversion project.

in the process of researching axles. the 930 output flange is different than the SC stub axle. got some info from another thread where I asked about this. need to dig out the SC axles and a pair of 3.2 axles I have to see if the 3.2 axles match the 930 output flange.
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Old 07-19-2019, 07:10 AM
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Quote:
Originally Posted by Geronimo View Post
Many STi's are making double 930 power these days and launching it through stock 6spd's to all four wheels... just sayin'

That said the cost and amount of work to fit one would pay for a SBH 930 trans.
Just saw this comment on the bump. What Geary is talking about is the aftermarket ring and pinion sets that make the gearbox spin the other way. Doesn't matter one bit if a stock STi gearbox can handle a million HP if the replacement ring and pinion set you put into is junk.
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Old 07-19-2019, 07:12 AM
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Quote:
Originally Posted by Geronimo View Post
Many STi's are making double 930 power these days and launching it through stock 6spd's to all four wheels... just sayin'

That said the cost and amount of work to fit one would pay for a SBH 930 trans.
You should get a 'vette.
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Old 07-19-2019, 10:16 AM
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I'm taking apart a nice 930 transaxle now. Turned out to look perfect inside has me wondering if I can make it fit into my 77 chassis without having to cut it down 1,25".

But I'll likely cut it, going out to measure now again.




It seems for only 1,25 inches I should be able to make it work without cutting up a nice trans. The motor fan may end up closer to the crossmember and I would modify the carriers a bit.

I need to decide bc I've got the trans apart. It looks perfect inside. The seller said it shifted well. He "upgraded" to a G50 but apparently didn't think it was worth all the money he spent.


Hilarious to see 3rd and 4th are both overdrives. Has factory LSD

No damage that I can see anywhere, it was used with care obviously.

Last edited by Fixer; 06-29-2020 at 07:09 AM..
Old 06-29-2020, 07:01 AM
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I think 1st and 2nd syncros might be a problem.
Old 06-29-2020, 08:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #37 (permalink)
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Quote:
Originally Posted by Fixer View Post
I'm taking apart a nice 930 transaxle now. Turned out to look perfect inside has me wondering if I can make it fit into my 77 chassis without having to cut it down 1,25".
Yeh, good luck with fitting a full-length 930 transaxle into a '77 911. I'm gonna say "not even close".

With a SBH G50 (which I believe to be exactly the same length as a SBH 930) and a relieved torsion bar tube (it simply would not fit without), my crank pulley nut ended up so close to the rear cross member it is inconvenient/little awkward to turn the motor over. Shallow offset ring is the only thing I own that can even get on it - and I'm very tempted to cut and re-weld it oh-so-slightly shallower to make it a less awkward fit...

Quote:
Originally Posted by Fixer View Post
No damage that I can see anywhere, it was used with care obviously.
930 transaxle is overkill for a 930. They'll take a lot more power than 300HP without blinking.

Because what Porsche was really doing was homologating them for the 935s after they figured out with the RSRs that there was simply no way to make a 915 last a single race at those power levels (according to Starkey).
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Old 06-29-2020, 02:13 PM
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Quote:
Originally Posted by spuggy View Post
Yeh, good luck with fitting a full-length 930 transaxle into a '77 911. I'm gonna say "not even close".

With a SBH G50 (which I believe to be exactly the same length as a SBH 930) and a relieved torsion bar tube (it simply would not fit without), my crank pulley nut ended up so close to the rear cross member it is inconvenient/little awkward to turn the motor over. Shallow offset ring is the only thing I own that can even get on it - and I'm very tempted to cut and re-weld it oh-so-slightly shallower to make it a less awkward fit...



930 transaxle is overkill for a 930. They'll take a lot more power than 300HP without blinking.

Because what Porsche was really doing was homologating them for the 935s after they figured out with the RSRs that there was simply no way to make a 915 last a single race at those power levels (according to Starkey).
Yes, I've read that too.

I decided to shorten it by 1,25" I'll Tig it up nice and post here. Gear sets are not stock, only 3rd and final drive are.
I'm really happy about this purchase.




Stock 930 ratios are on the left, mine to right.
I plan on using Swepco and changing religiously.

Last edited by Fixer; 06-29-2020 at 04:34 PM..
Old 06-29-2020, 04:20 PM
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I've heard 28mm trimming is the magic number.

Any more than that and not enough splines area is left.

Old 06-29-2020, 07:35 PM
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