part numbers for 78-80 turbo rotors????

[Bill Verburg]

Blown, If you put Big Reds on the front and leave the 930 calipers on the rear you will have more front bias than your current setup. It will be ok but just more agressive. In fact the bias will be very close to what Chris Bennet has on his. There will be a bit more mechanical advantage due to the necessarily larger rotor and pad area

Most vendors these days use rotors from only 3 sources. Proprietary rotors are very rare these days. The biggest difference is in the method of attachment to the hats. That said cad plating and slotting are pluses which are not universily available.

You can use the '78-79 hats as long as you have the '78-79 930 hubs. Most of the industry has standardized on the hats which bolt to the 911 hubs, similar to what porsche did in '80

Chris, there are no factory 930 spec rotors for the front which are non floating and which can be accomodated by narrow fenders. Your only choice here is Coleman as supplied by VCI. They are cheap enough and readily available.

[dean]

Bill,
I take back what I said about using Bigreds. I remembered that they will not fit with Fuchs. The 930 calipers are great but expensive. So the only thing I would do different is source the bolts myself.
The floating rotor noise (clack-clack-clack) does take getting used to and sometimes I forget what it is and wonder what is wrong with my car. Duh

[ChrisBennet]

Originally posted by Bill Verburg
Blown, If you put Big Reds on the front and leave the 930 calipers on the rear you will have more front bias than your current setup. It will be ok but just more agressive. In fact the bias will be very close to what Chris Bennet has on his. There will be a bit more mechanical advantage due to the necessarily larger rotor and pad area
...
Chris, there are no factory 930 spec rotors for the front which are non floating and which can be accomodated by narrow fenders. Your only choice here is Coleman as supplied by VCI. They are cheap enough and readily available.

Bill,
Are you saying the 993f/930r bias is suboptimal? Can I "fix" this with a bias valve? My front (930 Coleman) rotors wore out in 3 seasons but my rear (930 Zimmerman?) still measured "new" i.e zero wear. I can't remember for sure, but I think the rear pads wore out at about the same rate as the front. Is this a bias issue or just the softer Coleman rotors wearing faster?
TIA,
Chris

[dickster]

I have the VCI floating rotor setup with S4/993 calipers in front and 930 calipers/rotors in the rear. I think I used PowerTech to machine the 930 rear calipers. PowerTech charged about half of what VCI wanted. I suspect that if PowerTech has a front hub solution for you, they might be cheaper than VCI on that as well.

HALF? now you tell me

too late buddy, already shipped 'em, oh well.