Hi all, I need your advises

I was looking for a brake upgrade for my 1986 911 carrera so I first thought of a big red brake kit from a twin turbo 993, but I've heard that for half the price I could go with the boxster calipers between 1997 to 2004, what do you think ???

 

I put boxster calipers on the front of my 85 911 before I had learned more about brake systems. I installed them when I started taking my car to Driver Education events, thinking I needed 'more brakes'.

the question is what are you trying to accomplish?

 

EXACTLY!

what is the goal - the current "problem"
how is the car driven

bigger calipers do NOT offer more stopping surface - unless paired with bigger rotors

 

this thread isnt even a page deep - good place to start reading - recent info on the exact subject

https://rennlist.com/forums/911-foru...e-upgrade.html

 

Here's a comparative survey of most of the common brake setups that have been used on 911s


Pay close attention to the brake torque and rotor size. Increasing brake torque puts more heat into the rotor, the only real shortcoming of 911 brakes for some users is overheating due to speed/weight and overuse. Putting a caliper that exacerbates that is not an upgrade in my mind. A general guideline for you, if you increase the brake torque at a rotor you also want to increase the rotor size or at least the rotor heat handling capability.

Lots of folks get by because they lose weight, increase cooling and use pads and fluid that handle heat better than average.

also pay attention to f/r balance, the 911s thru 1983 had what can arguably be described as perfect balance, you would do well to retain that balance. If for no other reason than the more front bias the more heat goes into the front rotors.

Lastly be sure that whatever you use fits in the wheels you have, 993RS are great brakes but you will want 17s to accommodate them. 930s can still fit in 15s

 

I just bought my Porsche few weeks from now, it's my first 'classic car' and a dreams come through.

I raced cars in the past so I would like to bring my 911 to some DE events. I will drive the car 60% street and 40% DE events with Rennsport at Tremblant and hopefully Calabogie too (love that track !!)

The goal is to begging a process in upgrading my car both in performance and look.

I currently have 17s C2 wheels on the car but planning to change them, I would like to go with 930 Fuchs wheels.

And sorry if I was not clear enough but I will change rotors too, not just calipers.

 

There are many people who DE their older 911's with stock brakes ... the key is to have good "thick" track pads and high quality brake fluid.
Some people i run with like the PFC's,not so much the Pagids but it's all a personal choice.Friend of mine is quick in the black run group with his 88 911 and stock brakes although the rotors have had nice shades of purple at times ... lol

If you plan on using 16 inch wheels,your tire choice will be limited and the only brake "upgrade" that will fit inside your wheels is a complete 930 Turbo brake system package which will cost you many $$$

Cheers !
Phil

 

We can help you with 17" wheels you will need to fit the brake upgrade that you are considering.

 

Yes indeed Fikse will help you !
Alan set me up last Summer with a beautiful set of 17 inch Profil 5's to compliment my wet condition FM10's ,great lightweight quality wheels !!!

Cheers !
Phil

 

Hi Phil, I read on another post that 16s tires will by hard to find in racing compound, did I understod correctly ?? If so... I was not thinking in using the Fuchs on the track anyway, I could probably use my C2 wheels in 17 inch or should I go with 15 inch ?? will I be screwed for my brake upgrade ??

 

Hi,

If you really want to have good brakes for track days, especially in light of your racing experience, I'd strongly recommend installing 930 Turbo calipers and rotors. These will fit inside any wheels you choose and offer a large margin of thermal reserves.

Boxster brakes are fine for street use, however they do suffer at the track due to the need for small rotors. DOT-spec race tires hasten their "demise" under such conditions.

 

Tks Steve for your inputs... nothing frustate me more than doing the same thing twice... I've always trying to do one and for all in everything I do

 

so what you are telling us is you just bought your car, never had it at an autocross or de event so have no idea of its capabilities or how to drive within that. you have decided based on what to "upgrade" your car ?

something doesnt add up as a truely experienced track guy would not do this. your post indicates lots of enthusiasm, it just needs to be tempered a little.

 

1980 911 SC with 3.6 conversion. Boxster brakes on Front with Carrera rotors on did not work for me.
I changed to 944 Turbo calipers and rotors. Calipers have to be machined to fit the 944-Turbo rotors and you will need a hub spacer.
I have Boxster rotors on rear with SC rotors. When the car was 2600 lbs it went through pads every 3 to 4 race weekends. Car weights 2415 with 5 gallons of fuel and me. Front brakes last a year.. Backs about 1.5 years. Depends on what pads you use also.. I get about 3 race years from the rotors & wheel bearings.. Got me through 9 regional championships... car is now for sale.. Just buy the car LOL!

 

'I changed to 944 Turbo calipers and rotors' That was the ket to your success.

Calipers are only a tertiary item to consider when thinking about a brake upgrade

again heat is the enemy and bigger rotors handle heat better than smaller rotors, think of them as bigger heat sinks, there's more to it than that because they also shed BTUs by radiation and convection, there are design features that aid that too.

hierarchy of 911 front rotors ranked by thermal capacity
282x20 911 thru '83
282x24 911 '84-89
964 298x28
993/930 304x32
993RS 322x32
996t 330x34
some of these are easier to fit on a 911 than others, easiest are any of the 911 rotors, 930 2 piece and 993RS 2 piece