Turbo 4 speed to G50

porsche 930twin · 12-08-2014, 08:36 PM

Hi all I am trying to get measurments or a diagram on machining G50 bellhousing and input shaft to fit it into a 1981 930 turbo I do not want to cut the torque tube... does anyone have a diagram...

Mario Motta · 12-08-2014, 09:39 PM

I did on my 78'. Everything will fit. I will send you some picture when back home. I installed removable gearbox mount, spacers on the torsion bar and i made more space under the gearstick (less than an inch) to fit the g50 gearstick from carrera 89'. At the end the only modification i did on the car was this little box i made under the gearstick. I will check how much i cutted from bell housing.

porsche 930twin · 12-16-2014, 01:37 PM

Hi Mario did you find the pictures and measurments to install G50 into turbo 4 speed...

lite75 · lite75's Garage

29mm max

porsche 930twin · 12-16-2014, 03:35 PM

Hi Lite 75.. is this of both bellhousing and input shaft are there any diagrams or pictures that would show the total swap...

lite75 · lite75's Garage

yes, both. 28mm should do it for you unless its a 75-77.

JakobM · 12-17-2014, 06:39 PM

what if 75-77 ?

Thanks

lite75 · lite75's Garage

They will need additional room, either move the motor back or notch the torsion tube. 75-77 have the motor mounted further forward compared to the later models.

Matt Monson · 12-18-2014, 09:28 PM

Quote:

yes, both. 28mm should do it for you unless its a 75-77.

This is accurate. We usually say 1.1mm. That's how much our 3 piece mainshafts are shortened.

Regards,

Matt

quattrorunner · quattrorunner's Garage

You mean 1.1"?

Matt Monson · 12-19-2014, 07:19 AM

Quote:

You mean 1.1"?

Yeah...that.

JakobM · 12-19-2014, 10:13 AM

Quote:

Originally Posted by lite75

They will need additional room, either move the motor back or notch the torsion tube. 75-77 have the motor mounted further forward compared to the later models.

Thanks, I know the engine is mounted 2.5mm (as I am informed) closer to the center of car compared to a 78-89, what I ment was, do we have knowledge to the additional measurements that has to be removed on the shaft, housing etc. to fit a 75-77 OE mounting?

I was under the impression that a G50 bellhousing could be set up and shortened to fit a 75-77 without having the engine moved 2.5mm backwards