NineMeister

Understood, I'll look at the clearance available next week. We currently have a white 964C4 in pieces which might be easy to mock up with a spare gearbox case and starter to take photos, I'll see what I can do.

NineMeister

The gearbox is still going together, slight hitch today when we remembered that my car is a 1990 C4 so has a speedo sensor on the diff, hence to avoid having to rewire the ABS output to the speedo head we dug out a matching 1990 964 differential cover for the bell housing and striped the diff to fit the magnetic drive ring.

The 993 6 speed centre casing number shows that it is from a G64/21, the 6 speed version of the G50/21. The output shaft is easily converted to C2 by removing the front torque converter drive pinion, an advantage to the C4 donor is that it has steel syncros on 1st & 2nd.

The differential is currently a standard 964 40% locker which will probably be replaced by a 40/65 9m Carbonetic which we manufacture for the 993RS & GT3.

NineMeister

New 96493 6 speed transmission finished, just need to find a workshop slot to plug it in.....

LastMezger

Print those and frame them! That's ART!

NineMeister

You like? Great stuff, thanks for that.

Your comment completely justifies forking out a set of tyres worth for my new Sigma 105 Macro lens, I suppose now all I need to do is to use it with my tripod to eliminate shake and see if I can produce some hardcore 911 gearbox & engine ****. Watch this space!

kos11-12

nice work !!

I am really intrigued to the reasons why you chose a G50/21 gearbox

NineMeister

The simple answer is that the biggest difference I notice when jumping out of a 964 and into a 993 is the quality of the gear change and closer overall ratios, hence it is just personal preference. That said, since the long term plan is to further develop the car we are likely to upgrade the ratios to those of a G50/32 (or similar) once we know the torque spread and power level of the final engine solution.

NineMeister

The simple answer is that the biggest difference I notice when jumping out of a 964 and into a 993 is the quality of the gear change and closer overall ratios, hence it is simply personal preference. That said, since the long term plan is to further develop the car we are likely to upgrade the ratios to those of a G50/32 (or similar) once we know the torque spread and power level of the final engine solution.

kos11-12

Thanks Colin, OK I understand, I thought the 50/21 ratios are not so nice...
the 50/32 has the best ratios for a road car,
as a 5 speed the Swiss AWD 64/01 is not so bad,

Bill Verburg

a picture is worth a 1000 words

Here's a comparison of a healthy 3.6 w/ 993RS cams
g64.00 964 RoW 5speed vs 993 g50.21 the g64.00 uses taller gears in 1-4 than the g64.00 and the same 5 so it has closer gearing w/ smaller drops


993 g50.21 vs g50.32 again the big difference is in 1-3 where the 21 has lower gearing, but futrther apart

orp73

I love my 6 speed car, the gears are just right, car feels so much more alive (and a nicer gearshift too)

GermanCarSpecialists

I would like to get back on topic and trip over seats further

Admire the work here OP

NineMeister

Thanks to everyone for looking in and enjoying the ride so far.

Back on the case this week trying to sort out parts for the 2wd conversion, first port of call were the rear driveshafts. In case you are not aware, the C4 driveshafts have smaller joints with M8 threads in comparison to the C2 which has a larger M10 joint. Unfortunately we could not work out any combination of standard parts that would allow us to fit a larger C2 (or other) inner joint to the original C4 driveshaft due to a difference in the spline diameters. It was around 7 years ago that we last looked at this and the lads could not remember the details so although it was a worthy exercise we quickly abandoned that goal. I have now ordered a new pair of 964RS driveshafts direct from Porsche.

NineMeister

We have also managed to find a nice set of 16" D90 wheels courtesy of my mate Simon at Porschapart. Apparently they had been freshly refurbished but left on a 944 turbo which has been stood for quite some time to the point where the tyres were completely perished, hence the tyres are off and the wheels are ready for a quick flat down and face repaint in silver. Naturally with these on the car it will look more like a C4 Lightweight than RS which will also suit the original flag mirrors I guess?

JasonAndreas

Any ideas on how these are differ from the normal C2 drive shafts? I see the wheel hub nuts have different part numbers too.