Turbo Rotor Alternatives

1972_911T · 04-01-2006, 10:16 AM

Im wanting to do the 944 turbo brake upgrade, and want to know if there is an alternative to the floating 78-80 turbo rotor's for use with these calipers? mainly due to the high cost of these will the 944 turbo rotor's not work as they are signficantly cheeper? or is there an aftermarket single piece replacement for the 911's?

Steve

KTL · 10:32 AM

I'm a bit confused by your question.

As I understand it, the '86 944 Turbo rotor (It MUST be the 1986 rotor) is the preferred rotor to use with these calipers. Reason being for availability and cost-effectiveness.

The way to use the '86 rotor is how VCI has done it.

http://www.vehiclecraft.com/Brakes/VCI911_2_964.htm

Using caliper adapters and wheel bearing spacers, the rotor fits under the caliper correctly. Just barely clears the A-arm near the ball joint. Unfortunately the cost of adapting the calipers somewhat offsets the relatively cheap '86 944 Turbo rotors. Porsche performance ain't cheap!

Chris Streit (cstreit) has this exact setup on his 1970 911S racecar. 3 years running without a problem.

1972_911T · 04-01-2006, 10:54 AM

I got my info from this page where it says to use the 78-80 911 turbo 304mm floating rotor but after market non floating ones are available.

http://home.nycap.rr.com/wmv/generalbrmd.htm

Its my understanding that with this rotor the caliper can be used without modification is that correct?

Steve

Bill Verburg · Bill Verburg's Garage

Yes, I used them before the 993s became available, they are too much work to mount on a 911, Why not do the 993s?

You need to machine off the mounting ears, drill for radial mount bolts, clearance the throat, fab adapters
looks like this when done

993s are pre done

1972_911T · 04-01-2006, 02:34 PM

My main hold back is my 15" wheels which I want to keep, I know it sounds a bit condradictory to say this having a 3.2 motor in a 72 car and all but I want to keep it as close to original as possible, if only in looks not mechanics.

I have been told by a porsche engineer who rebuilt my trans last week that 944 turbo rear calipers can be fitted to the front and all that is needed is to slightly modify the offset of the bolt holes. I have seen this guy's work and have every faith he knows what he is talking about.

In you opinion is the machining and mounting brackets the only way to get them to fit?

Steve

Bill Verburg · Bill Verburg's Garage

The first decision you need to make is do you want appearance or substance?

If substance how much more brake do you want or need.

Yes, the holes in a 964 or 944t can be hogged out(fronts not rears) and used w/ Carrera rotors. But you get the same improvement for much less cash by using Carrera calipers on the Carrera rotors.

If you hog the holes then also use Carrera rotors and calipers on the back.

When I make a recommendation I try to make the best one based on my experience and usage, not one that might work(sortta), if you want less, then go for it.

1972_911T · 04-01-2006, 03:13 PM

So by modifying the mounting holes they will fit 3.2 rotors but to use the 944t or 911t floating rotors you need the mounting brackets to move the caliper further out?

Is there no way to get the 993 calipers under 15's from your pictures they look very similar calipers size wise.

Steve

Bill Verburg · Bill Verburg's Garage

The biggest brakes that you can get uder 15s are 930s

randywebb · 04-01-2006, 04:21 PM

Surely no one has ever opted for appearance over substance on their 911 braking setup???

1972_911T · 04-03-2006, 03:15 AM

I have been doing some reading from previous threads on this upgrade and im still intent on doing this conversion as short of going for the 930 brakes it offers the best upgrade for 15" wheels. I intend to do this properly using either the 930 rotors or the 944t rotors. Bill in your brake conversion page you mention some after market non floating 930 rotors could you point me in the direction of somewhere that does these? If I use the 930 rears will I still have pad overhang? Also can the monoblock caliper adapters that are readily available be modified to work with these calipers if I get the calipers machined here in the UK? Sending calipers to the US isnt really an option as postage and taxes would be silly.

Steve

Bill Verburg · Bill Verburg's Garage

Quote:

I intend to do this properly using either the 930 rotors or the 944t rotors. Bill in your brake conversion page you mention some after market non floating 930 rotors could you point me in the direction of somewhere that does these?

VCI has both

Quote:

If I use the 930 rears will I still have pad overhang?

No.

Have you talked to Autofarm? Motiv?

1972_911T · 04-03-2006, 02:31 PM

I have not spoke to autofarm reagrding any brake upgrade I have checked out there web site the other day and the only brake upgrade they have listed is the TRE boxster which as you have said many a time is not much of an upgrade due to it is still using the same rotor's.

However I am interested to know if the boxster/monoblok type adapters could be used with the machined 944t calipers? or will they not give the correct axial and radial clearence?

If using the 944t fronts of much does the caliper mount need to move in each direction from standard?

Steve