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930 Transmission VS year

Can some detail the progression of transmissions in the 930 with the years that the new models arrived.

Thanks
Old 02-18-2010, 07:08 AM
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Forgive my ignorance but I thought that earlier 930's had something different than the 915 gearbox. I know that the G50/50 was only in the 89 year.
Old 02-18-2010, 08:18 AM
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The gearbox from 1976-1988 was a 4-speed. Essentially a strengthened 915, from what I've been told. Only 4 speeds were deemed neccesary, as the factory felt the torque from the turbo-charged motor was adequate. The rest of the 911 line (the non-turbos) had a 5-speed during this time.

1989 brought the G50-50, a 5-speed. This was based upon the G50 box used in the normally-aspirated cars.
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Old 02-18-2010, 08:24 AM
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I've heard that Getrag, the company that makes the transmission didn't have a 5 speed transaxle gearbox strong enough for the 930's torque until they came out with the G50 - 50 in '89.
ZF makes the differentials.
Old 02-18-2010, 09:43 AM
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Quote:
Originally Posted by Noah930 View Post
The gearbox from 1976-1988 was a 4-speed. Essentially a strengthened 915, from what I've been told. Only 4 speeds were deemed neccesary, as the factory felt the torque from the turbo-charged motor was adequate. The rest of the 911 line (the non-turbos) had a 5-speed during this time.

1989 brought the G50-50, a 5-speed. This was based upon the G50 box used in the normally-aspirated cars.
Thanks, I was not sure if the earliest model 930's had a 901
Old 02-18-2010, 10:18 AM
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901 gearboxes were the first ones from the sixties and used in the 2 and 2.2 liter cars.
..and fwiw, the first 901 prototype gearbox was called a 902 gearbox.
Old 02-18-2010, 10:25 AM
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The 915 was developed for the 2.4 in 72 as the 901 was seen to be at the end of its useful life due to the increased power of the 2.4 and 2.7 cars. Also the dog leg 1st shift pattern was seen as antiquated and may hinder sales in the future.

Also at this time porsche knew the 2.7RS and other more powerful versions were coming so they needed a new gearbox that could reliably take up to 300hp in the 2.8 RSR.

The prototype engines for the 930 were developed initially using the 2.7 and 915 and put out 280hp. They decided eventually to reduce the boost to 0.8 bar, increase displacement to 3.0 using the al. case for improved off boost torque and develop a version of the 4 speed box from the Carrera RSR amongst others. This basic 4 speed gearbox had been tested to be reliable at well over 600hp. The 915 5 speed was not seen to be reliable enough to go in to the the flagship production car given the expected power output and likely further development of the 930 in to the future.

The G50 5 speed replaced the 915 in MY87. Im not sure why it wasnt put in to 930 until MY89. Perhaps others know that story.
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Old 02-18-2010, 07:16 PM
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