Has anyone done a post of what you need to put 944 Turbo Brakes on a 911SC

[glerbone]

When I bought my 1980 911SC the previous owner threw in a set of
944 Turbo Calipers Front and Rear.

I'm looking to build a track/weekend car.

The 3.0 Motor is rebuilt with 9.8 Comp pistons etc and hotter cams.

I just want a little more confidence in the braking for track days etc.

I've seen a few "kits" for putting the 944 Turbo Calipers on an SC. But
what I saw was $1600 and I suplly the calipers. Ouch.

Does anyone know of a budget way to do this? Or is their a technical write up?
I done multiple google searches and searches on this forum.. but still nothing that is very technical as to what parts I may need.

Any help is appreciated.


Thanks for looking!
-Greg

[MichiganMat]

Bill Verbug is the man for all things brake related.

Im sure he'll chime in soon.

[Hotwatermusic]

My '74 911 came with 944 Turbo brakes already installed in the front. PO had them installed (or the PO before him, don't know). All I will say is, and I've posted this before, if the 944 Turbo brakes are an UPGRADE for a 70's to SC era 911, than the stock brakes Porsche put on these cars must be absolute garbage. My 74 has none-power assisted brakes, so that might be part of my issue, but I've learned to leave about double the stopping distance needed for my other cars when driving the 911. I also have Carrera front calipers on my car, though I don't know if they are necessary to mount the 944T brakes. All I'll say is, don't be surprised if you're seriously underwelmed after doing all the work to install them and finding them to be only slightly, if at all, better than well-sorted stock.

[vash]

hotwater..stock SC calipers are cheap. even the carrera ones are decently priced..

stopping hard in my car leaves me giddy. i would find out what is wrong, or go back to stock (or closer to stock with the carrera clamps)

[GaryR]

There are a LOT of us racing SC's with stock calipers and better pads with no issues on stopping power. Spend your money on safety if you will be running on the track.

[glerbone]

The stock brakes seem to be great for the street, but I've heard they heat up pretty good on the track. I'm only looking to do 4+5 track days a year,
but good brakes are good peace of mind. They previous owner put Crossed drilled rotors on. And the stock brakes seem to work well. I wonder if the the member who chimed in with the 944T brakes may have a power assist problem?

Are your fronts bolted directly on? I assume they had to widen the bolt pattern and increase the hole so the spacing was correct. Do you have the rears too?

I will check in the the other member that was mentioned.

[Hotwatermusic]

Originally Posted by glerbone

The stock brakes seem to be great for the street, but I've heard they heat up pretty good on the track. I'm only looking to do 4+5 track days a year,
but good brakes are good peace of mind. They previous owner put Crossed drilled rotors on. And the stock brakes seem to work well. I wonder if the the member who chimed in with the 944T brakes may have a power assist problem?

Are your fronts bolted directly on? I assume they had to widen the bolt pattern and increase the hole so the spacing was correct. Do you have the rears too?

I will check in the the other member that was mentioned.

My car is a '74, so the brakes are not power assist. That may be part of the problem, but it can't be all of it. I don't the 944's on the back, only the front. They are mounted to Carrera calipers. I have Carrera rotors as well. I have 16" Fuchs that the 944T calipers are, literally, 4mm from touching the back of. I can't fit a book of matches between the petals of the Fuchs and the 944 brake calipers. When I first noticed how close they were, I could not believe they were mounted correctly. You'll probably have better luck with yours than I have with mine, since you're doing it yourself and can do it methodically. I bought mine like this and didn't really know what the PO had done.

[juanbenae]

you can groove out the existing mounting holes in the 944s and they will align with carerra rotor as ive been told. i have a pair at home and have put a lot of other things on the car to go faster before i will cross that bridge

[Bill Verburg]

This issue has only been addressed on the order of 100 times. But what the heck

the primary weakness found in 911 brakes is from heat developed during track use. The brakes overheat because the rotors cannot absorb and dissipate heat fast enough

solutions
1) cooling
2) cooling
3) cooling
4) weight loss
5) use track oriented pads and fluid
6) when all else fails bbk

as to #6, bigger calipers and pads in no way address the issue, bigger rotors do. The bigger rotor acts as a bigger heat sink allowing a longer period before excess temps arise. Some of the bigger rotors also incorporate improved internal ducting that increases the transfer of heat to the atmosphere.

getting to the question posed in Post#1.

Has anyone done a post of what you need to put 944 Turbo Brakes on a 911SC

yes, it has been done in 3 different ways
method 1
the half as**d way to do it is to leave the inadequately sized 3.2 Carrera rotors and modify the calipers to somehow interact w/ them, this method does not address in any meaningful way the primary issue - heat and how to handle it

method 2
adapt the big 944t rotors and calipers to a 911, this can be done it works well, you will need a bigger 930 m/c, they brakes will require a lot of leg(too much for many w/o power brakes). I haven't done it this way so can't comment on details

method 3
964 and 944t calipers are the same except for the original design as leading or trailing mount. Swap the feed on 944t to make them into leading mount and proceed as w/ 964 calipers.
step 1
machine the mounting ears off converting the caliper from axial to radial mount, use caliper adapters

this is what they look like when ready to mount on the struts


but a set of 304x32mm 2 piece rotors and flat hats, these bolt to stock 911 hubs

this is what they look like







in back fill the stock mounts and redrill @3" for the 911 trailing arms, clearance the throat for 309x28mm 930 rotors

they'll look like this





'78-89 930 rear rotors bolt right up and retain the stock parking brakes, you will have to cut the mounts for the shields off.

you will need a 23.8mm m/c, if this is in a non boosted app the leg effort will be quite high. In a boosted app not a problem You will need 7 & 8 x16" wheels minimum and a small spacer in front unless 944 7s or aftermarket wheels w/ bbk clearance are used.

[glerbone]

Wow,

Thanks Bill for all of the great info!

I may PM you if I get stuck. From what all the messages I've seen, you are the brake
guru around here.

I appreciate your help.

-Greg