marc a

Just as a bit of background, my car is an '86 turbo. When I swapped in the LS I put a set of Superlites on the front with adapters. I used the stock rotors, which as you all know are small. I chose to go this route because the pads were 50% larger than the stock pads and I had several sets of '86 spindles that I had been stockpiling. The stopping power was very good, but I went through 2 to 3 sets of rotors a season depending on the number of events that I attended. OE rotors run 200/pr and up.

In the beginning of this season I went through my last set of spindles so I started my quest for the "right" brake upgrade. I found Ollie on this board that had installed the 6 piston GT3 calipers on his '88 951 and that was all she wrote.

I contacted Doug Arnao at VCI brakes who had done one such upgrade, but used custom hats and rotors which are very expensive. So after reading some more, I learned that the 350x34mm rotor used by the 996 GT3 was exactly the same as the rotor used on the Cayennes, Q7s and Touregs with the big brakes. Cost varies from 100/pr (yes per pair) to 300/pr for the high end slotted and drilled rotors. I sent Doug a rotor and caliper and he mocked up a bracket, and after one slight adjustment the project became a reality. You can use the '88 951 master cylinder because the piston area of the 6 piston is not much more than the 4 piston units (3877mm vs 3475mm). I have an adjustable bias valve that was needed when the Superlites were installed.

The only hardware that you need is a banjo bolt and union on the caliper that allows the brake line to be installed from the bottom of the caliper rather than straight in.

I will also have centering rings made as the two set screws work ok, but they are not perfect.

In converting to the late offset I used a set of Highstrung A-Arms which some of the local 944 racers are using. No experience yet, but the racers have been using them for a couple of years now and I haven't heard any complaints.

The car is off to the shop this week to get the front end aligned, etc. First track event should be in a couple of weeks.

____________________
'00 Audi TT
'99 996 (Wife's ride)
'86 951 LS1 (C-2)
'77 911 3.2 (C-1) Gone but not forgotten.
3.2 Conversion and 915 Rebuild Home Page
The 958 Conversion
PCA National Registry of Instructors

dillon410021

very nice

333pg333

How come you were going through so many spindles?

marc a

Mainly because the spindles that I purchased were used and of varying quality. We are talking about 3 sets since 2005. The '86 spindle is the smallest diameterwise of the 951s so I don't take a chance when there is any play in the wheel/hub when bearings have been replaced.
____________________
'00 Audi TT
'99 996 (Wife's ride)
'86 951 LS1 (C-2)
'77 911 3.2 (C-1) Gone but not forgotten.
3.2 Conversion and 915 Rebuild Home Page
The 958 Conversion
958 Track Video
PCA National Registry of Instructors

zeusrotty

Awesome post! Can you supply the guys info so that we can have a set of adapters made?

zeusrotty

Awesome post! Can you supply the guys info so that we can have a set of adapters made?

marc a

Doug Arnao - Vehicle Craft, Inc: http://www.vehiclecraft.com 800-845-5948.

Tell him Marc sent you.

____________________
'00 Audi TT
'99 996 (Wife's ride)
'86 951 LS1 (C-2)
'77 911 3.2 (C-1) Gone but not forgotten.
3.2 Conversion and 915 Rebuild Home Page
The 958 Conversion
PCA National Registry of Instructors

marc a

Just wanted to update this thread since I have now had two events on the brake set up. Because of the "V" being in the way the brake booster was removed so it took me a while to get used to the amount of force that could be applied before lock up. With the Pagid RS29 pads the stopping power was just unbelievable. I have an apportioning valve from the prior set up and running the stock '86 951 set up in the rear with Pagid Orange pads. Once the rears were dialed in I was at least 1 to 1.5 markers later than before.

So if you are on the fence about a brake upgrade you might as well just jump on this set up.

Cheers

Marc
____________________
'00 Audi TT
'99 996 (Wife's ride)
'86 951 LS1 (C-2)
'77 911 3.2 (C-1) Gone but not forgotten.
3.2 Conversion and 915 Rebuild Home Page
The 958 Conversion
PCA National Registry of Instructors

dand86951

Marc, when you are on the track do you have any problems with pad knock back forcing you to hit the brake pedal once or twice to get a firm pedal?

marc a

Dan,

When I did the conversion new wheel bearings were installed in the '87 hubs so I haven't had any problems. With the prior set up (Wilwood superlites) I had knock back when the wheel bearings were out of adjustment or bad. If you are positive that the bearings are good and properly adjusted and knockback occurs, there is a one way relief valve that can be installed inline that holds 2lbs of pressure on the caliper keeping the pads on the rotors.

Marc
__________________________
'00 Audi TT
'99 996 (Wife's ride)
'86 951 LS1 (C-2)
'77 911 3.2 (C-1) Gone but not forgotten.
3.2 Conversion and 915 Rebuild Home Page
The 958 Conversion
958 Track Video
PCA National Registry of Instructors

333pg333

So Marc, do you now run a dual m/c Tilton type setup? Are you saying that with this setup you now have a lot longer pedal travel but better modulation? Or a similar pedal travel but requiring much higher pressure from you? Does the pressure required vary when you adjust front to rear bias? Also, is your car a stripped out trackcar. How much does it weigh?

Unfortunately those of us supposedly 'blessed' with Mo30 can't retrofit these contemporary calipers....shame...

Olli Snellman

We had similar kind of kit developed about 6-years ago with Pete to our 951's .
Here's one of the first kits






Now the complete kit is available under my friends company's 9products product line




http://9products.com/gt3-brake-adapter-kit

Also just front caliper adapters available

marc a

Hey Olli,

For those that don't know Olli is the grand master of this conversion. I stumbled on his info which was the impetus of my conversion.

Marc

dand86951

Marc, thanks for this tid bit, I haven't previously heard of anyone using a valve in-line to keep a minimum pressure. While I think in my last race I may have had one front wheel bearing a bit too loose, I am still scratching my head trying to figure out the brake pedal issues.

Do you have a source for the valve?

dand86951

Well if you really wan to you can switch to the 968 or late model S2 spindles. According to Racers Edge they are the same strength as the M030. Then you have to figure out the spacers, but it is doable.

I wound up switching back to the non M030 spindles after a guy hit me on the track breaking my left front rotor and spindle.