G50 gearbox conversions for 930

[456mgt]

Has anyone here transplanted a G50 gearbox into an 80's vintage 911? I'm thinking of putting one in the 930. Had a long chat with one of the mechanics at Portiacraft and he told me he'd put a G50 in his 3.2. So can anyone comment on how good this gearbox is, and if it's a must have, what are the options for sourcing one?

Thanks guys

[Sunnysidebb]

456mgt said:

Has anyone here transplanted a G50 gearbox into an 80's vintage 911? I'm thinking of putting one in the 930. Had a long chat with one of the mechanics at Portiacraft and he told me he'd put a G50 in his 3.2. So can anyone comment on how good this gearbox is, and if it's a must have, what are the options for sourcing one?

Thanks guys

I dont know about the transplant, but I spent a lot of time looking for a G50 to into my 964 powered Split 62 camper. Couldn't get one so bought a 964 box instead. Supposed to be very similar except I dont a LSD. I paid £2500 for it second hand.
Frank.

[456mgt]

Thanks Frank! Must go back and check out how you're doing on the split

[Steve Devaney]

An issue to consider I guess would be how the transplant would affect the value of an original 930. What sometimes seems a great idea on paper, does't always reflect in monetary value when resale time comes around - just read recent comments on how Turbo cars only fetch top money when they are std and not packing mega GeeGees!

However, I good 'upgrade' can help with YOUR enjoyment of YOUR car so this also has to be a consideration.

[charge]

My '76 bitsa has a RUF block with 930 running gear and a G50 box. Gear change feels pants compared to modern Porkas, but slightly better than the four speeder. Was told it is a ten grand job to change floorpan areas and torsion bars? JBL 930 has a six speeder in his 930, maybe you could drop him a line on what's involved.

[456mgt]

Steve Devaney said:

However, I good 'upgrade' can help with YOUR enjoyment of YOUR car so this also has to be a consideration.

I have no intention of selling it Steve, and it has a (strengthened I think) 915 box in there already, so it isn't standard. It's a slow-witted thing though. The car owes me absolutely nothing so am pretty insensitive to how anyone else values it. I'll change the gearbox within the next 6 months, it's more a question of which gearbox and it has to be a sensational reason (ie not value) to go back to the original 4 speed box.

[Steve Devaney]

456mgt said:

Steve Devaney said:

However, I good 'upgrade' can help with YOUR enjoyment of YOUR car so this also has to be a consideration.

I have no intention of selling it Steve, and it has a (strengthened I think) 915 box in there already, so it isn't standard. It's a slow-witted thing though. The car owes me absolutely nothing so am pretty insensitive to how anyone else values it. I'll change the gearbox within the next 6 months, it's more a question of which gearbox and it has to be a sensational reason (ie not value) to go back to the original 4 speed box.

Having recently tested a good number of 915/G50 cars, the difference between the two is incredible. I had made my mind up that no matter how good a car a 915 box carrier may be, it had to have a G50 or the 964 version which codename iludes me (might be G50!?).

So, I do know where you are coming from my friend - best of luck.

[911perv]

G50 box ran from 1987 to 1998

[Steve Devaney]

911perv said:

G50 box ran from 1987 to 1998

The throw seems a lot shorter on the 964 - just a shorter stick or is just me?

[Crimp a Length!]

Steve Devaney said:

911perv said:

G50 box ran from 1987 to 1998

The throw seems a lot shorter on the 964 - just a shorter stick or is just me?

Shorter stick, i'm pretty sure it was a G50 in the 964, albeit not sure if the 4wd had the same box??
The G50 was only in the 930 on the 1989 model.

[MrCooke]

G50 in a 964, just a different lever.

A 930 with a 915 is an odd thing - Porsche didn't put it in because it couldn't handle the torque, so why would anyone go to the bother of converting a car to something that won't work in it?

There are significant tunnel and ARB alterations to put a G50 into a 915 NA car, yours will have been messed about with to fit the 915 so who knows what's been done.

I quite like the 4 speed box, I think the ratios are better spread for the character of the engine, but most folk prefer the G50, so if you're going to the trouble of a conversion then that's the one!

[shoestring7]

MrCooke said:

G50 in a 964, just a different lever.

Its the G50/03. It has a different 5th gear pinion, and different 3rd to 5th ratios. From MY91 on there was an improved gear selector shaft.


SS7

[456mgt]

Ta very much guys. Will have to investigate a bit further; if we really are talking >10 grand, the whole bloody car didn't cost much more than that. It may be the very excellent and sensible reason I go with the oem 4 speed box..

[JBL930]

The 915 is the early 5 speed which was not strong enough for the turbo, hence the 4 speed that the 930 came with. Then from 87 the NA cars got the G50/00 in Europe, and the 930 got the G50/50 in 1989 only.
All the info is here

G50.00 1987-1989** 3.2 Carrera, Rest of World version
G50.01 1987-1989** 3.2 Carrera, US/CDN/Aus/Jpn version
G50.02 1987-1989** 3.2 Carrera, Swiss version

G50.03 964 C2 1990-1992 1L is plain, 2L is M220
G50.04 964 C2 1990-1994 Swiss version
G50.05 964 C2 1992-1994 US/CDN version including RS America
G50.10 964 RS (street legal basic race car, non-US)

G50.20 993 C2 US/CDN/Swiss version
G50.21 993 C2 ROW
G50.31 993 C2 RS version ROW only
G50.32 993 C2 RS M003 (clubsport) version ROW only
G50.33 993 C2 RS Swiss version only

G50.50 3.3 Turbo 1989 first G50 turbo version (larger ring & pinion)
G50.52 965 C2 Turbo 1991-1994


Ratios

G50/00 3.5 2.059 1.409 1.074 0.861 (after 1988 0.868) diff 9:31
G50/01 3.5 2.059 1.409 1.125 0.889 (after 1988 0.892)
G50/02 3.154 1.895 1.333 1.036 0.861 (after 1988 0.868)
G50/03 3.5 2.059 1.407 1.086 0.868
G50/04 3.154 1.895 1.333 1.029 0.868
G50/05 3.5 2.059 1.407 1.086 0.868 diff 3.333:1
G50/10 3.154 1.895 1.407 1.086 0.868
G50/50 3.154 1.789 1.269 0.967 0.756
G50/52 3.154 1.789 1.269 0.967 0.756



Fitting a G50 in any 4 speed 930 is quite a big job, the 4 speed is cable and the G50 is hydraulic which requires a different peddle box and a master cylinder, you also need the linkage. Then you need the correct flywheel, clutch and all the other bits.... The torsion tube needs to be cut away and new coil over suspension fitted, with the necessary strengthening of the strut towers. It's lengthy, but i think it's worth it, it's a different car with it in.
Mine is a G50/50 by the way, so not a six speed, that requires even more work..... There might be some useful info for you on my build thread, i need to update it at some point http://pistonheads.com/xforums/topic.asp?h=0&f...

Edited by JBL930 on Saturday 30th October 20:07

[Crimp a Length!]

JBL930 said:

The 915 is the early 5 speed which was not strong enough for the turbo, hence the 4 speed that the 930 came with. Then from 87 the NA cars got the G50/00 in Europe, and the 930 got the G50/50 in 1989 only.
All the info is here

G50.00 1987-1989** 3.2 Carrera, Rest of World version
G50.01 1987-1989** 3.2 Carrera, US/CDN/Aus/Jpn version
G50.02 1987-1989** 3.2 Carrera, Swiss version

G50.03 964 C2 1990-1992 1L is plain, 2L is M220
G50.04 964 C2 1990-1994 Swiss version
G50.05 964 C2 1992-1994 US/CDN version including RS America
G50.10 964 RS (street legal basic race car, non-US)

G50.20 993 C2 US/CDN/Swiss version
G50.21 993 C2 ROW
G50.31 993 C2 RS version ROW only
G50.32 993 C2 RS M003 (clubsport) version ROW only
G50.33 993 C2 RS Swiss version only

G50.50 3.3 Turbo 1989 first G50 turbo version (larger ring & pinion)
G50.52 965 C2 Turbo 1991-1994


Ratios

G50/00 3.5 2.059 1.409 1.074 0.861 (after 1988 0.868) diff 9:31
G50/01 3.5 2.059 1.409 1.125 0.889 (after 1988 0.892)
G50/02 3.154 1.895 1.333 1.036 0.861 (after 1988 0.868)
G50/03 3.5 2.059 1.407 1.086 0.868
G50/04 3.154 1.895 1.333 1.029 0.868
G50/05 3.5 2.059 1.407 1.086 0.868 diff 3.333:1
G50/10 3.154 1.895 1.407 1.086 0.868
G50/50 3.154 1.789 1.269 0.967 0.756
G50/52 3.154 1.789 1.269 0.967 0.756



Fitting a G50 in any 4 speed 930 is quite a big job, the 4 speed is cable and the G50 is hydraulic which requires a different peddle box and a master cylinder, you also need the linkage. Then you need the correct flywheel, clutch and all the other bits.... The torsion tube needs to be cut away and new coil over suspension fitted, with the necessary strengthening of the strut towers. It's lengthy, but i think it's worth it, it's a different car with it in.
Mine is a G50/50 by the way, so not a six speed, that requires even more work..... There might be some useful info for you on my build thread, i need to update it at some point http://pistonheads.com/xforums/topic.asp?h=0&f...

Edited by JBL930 on Saturday 30th October 20:07

Fair play to you.

[stuttgartmetal]

Leave it alone.
If you want a five speed, sell it, and get one.

Or get a 964.3.3

Or a 993TT

Leave it[/regan]

[BertBert]

Crimp a Length! said:

JBL930 said:

stuff

Fair play to you.

Other than the stuff about coilovers has no relevance to the fitting of the G50 box.
Bert

[Crimp a Length!]

BertBert said:

Crimp a Length! said:

JBL930 said:

stuff

Fair play to you.

Other than the stuff about coilovers has no relevance to the fitting of the G50 box.
Bert

Bloody ell Bert.
Not enough room on ere for that.....topics a bit dull anyway, just buy a 5 speed (if you can find one!)

[BertBert]

Looking at the 930 targa, Crimp me old mate. What do you think?
Bert

[JBL930]

BertBert said:

Other than the stuff about coilovers has no relevance to the fitting of the G50 box.
Bert

Another chap to add to the "Prick" list