carrera79

hi,
did a search and didn't find a good answer.
Can i put without any parts (direct bolt on) 965 turbo calipers for front and rear on a 993 targa with 17" wheels ?
do i need some parts to adapt ?
do i need 18" wheels ?
do i need to change brake disc ?
thanks for helping me

fred

Bull

If you mean the 964 Turbo 3.6 (not really a 965, but many call it by that number), there is no sense in changing the rears as they are the same size as the 993 rears. The fronts from a 964 T 3.6 are the same size as the front Big Reds from a 993. I don't know if they bolt right on like Big Reds though.

mborkow

965 was the internal number at porsche for the 964 T 3.6

Bill Verburg

965 front are the same as 993tt or 993RS front, the calipers are a bolt on when using 993tt front rotors.

The back is a different story, the pistion size and mounts for the 965 rear calipers are the same as for a n/a 993 but the throat of the 965 rear caliper wants a 28mm rotor not the 24mm 993 rear rotor.

to solve this issue you use either the 993RS rear calipers and rotors(preferre) or the 993tt rear calipers and rotors.

All of the above do fit in some but not necessarily all 17" wheels. Because of o/s and spoke clearance available w/ different designs

Feehliks

Bull ist right, 965 was in fact a different project for a turbocharged 964 which got cancelled because the car would have been too expensive.

Best regards,

Felix

Bill Verburg

965 refers to the 964 3.6T
there were many parts for that car, such as brakes that have specific 965*****part #s

carrera79

thanks bill, what is your opinion with cup2 17" wheels ?
will there be enough clearance or should i go with 18" ?
And what is the problem if I go only with front caliper (with 993TT brake disc) and i leave stock rear brake system ?
TIA
fred

Bill Verburg

Not sure, never used them. Yoo need a minimum of ~65mm of clearance from the rotor face to the back of the spokes, you can use the stock 993 front rotor to measure from.

The radial clearance is fine, unless the Cup 2 has a severe taper, which I don't believe that they do have.

Way too much front bias

carrera79

what do you mean by bias ?
if i put the complet 965 system, i've got 993TT front and stock 993 rear, no ?
fred

nono993

All the answers you got lead you to the same information I provided to you, funny that it still doesn't suffice

Bill Verburg

Yes, but you have moved from a system that is biased(balanced) for a a 993 to one that now has far mre braking bing done at the front(biase has been moved forward).

Under light to moderate braking this is unlikely to cause any issues but under severe braking the fronts are going to be far more likely to lock, this is a very undesireable situation.

Bull

Yes, but it was also the internal number used for all other 964 Turbos, including the 3.3s from '91-93, which had different brakes.

Bull

If they are the Factory Cup 2 wheels, the Big Reds from a 993 will work fine. A couple of friends have done the conversion on their 993s and stayed with the 17" Cups.

carrera79

thanks bull and bill,
bill you mean that i should put front AND rear 993TT brake, and not only front ?
that means the 965 brake system is not balanced as the stock 993C2 ?
TIA
fred
P.S.
nono, je ne mets pas en doute tes paroles, mais tu m'as conseille de me renseigner plus en profondeur, non ?
ici, la transfo est courante...

Bill Verburg

Yes, 993RS rear are preferred

The turbos have much different requirements because of weight distribution and ABS calibration