What master cylinder to buy for big reds

[Madsimilius]

I'm wondering what MC to buy for my 78 911 sc 996 N/A brake conversion.
Don't know if this matters or not, i've bought a g50/00 and i´m going to change the pedal cluster.

anyone ?

[mamut]

930 M/C will work. Stef.

[Madsimilius]

what about the 964 brake master cylinder ? i also found a brand new Porsche Brake Master Cylinder 23mm High Perf on ebay for 100$ it says 911sc in the add but further down it says up to 77 911s will this work?

If no i´ll just buy the 930 brake cylinder, but cost 4 times more then the 964 and 993 on ebay :/

Thnx

[Madsimilius]

hmm pre 77 are without the brake booster and won't work ? The 964 and 993 uses an electric booster ? in that case i would need that to, and that would probably get even more expensive :P seems the 78+ 930 cylinder is the one to go for .

[KTL]

The 964 & 993 won't work because the attachment to the brake booster assembly is different. Stef is correct that the proper master cylinder is the expensive 930 master used in 1978-1989 930 cars.

[Bill Verburg]

Originally Posted by Madsimilius

I'm wondering what MC to buy for my 78 911 sc 996 N/A brake conversion.
Don't know if this matters or not, i've bought a g50/00 and i´m going to change the pedal cluster.

anyone ?

As long as you are changing the pedal cluster it might be a good opportunity to change to a dual master setup. The 996 brakes don't have the best bias in the world and the dual master setup gives you an excellent option to correct that. Otherwise a 23.8mm m/c from a '78-89 930 is your next best choice.

The 964/993 use totally different and incompatible brake setups

[Madsimilius]

Ok thnx! The dual master setup is tempting but cost quite a bit more then the 930 23mm.

I'm planing to use the 996N/A brakes, is the N/A brake bias realy that bad?

If i buy the dual master setup i'll probably use the 996 turbo brakes.

[Bill Verburg]

Originally Posted by Madsimilius

Ok thnx! The dual master setup is tempting but cost quite a bit more then the 930 23mm.

I'm planing to use the 996N/A brakes, is the N/A brake bias realy that bad?

If i buy the dual master setup i'll probably use the 996 turbo brakes.

The target bias for a 911 is ~1.5

the n/a 996 using 996 rotors and caliper is 1.811 it's not the worst i've ever seen but especially for track use you want more rear, it's probably ok for a dd

[wildcat077]

If you install the 996TT brakes and you drive with street tires it will be real easy to lock up your front wheels under hard braking,although on the track with `R`compounds it`s much better.
I eventually installed a Fabcar dual master with bias adjuster and the brakes are nothing less than amazing !

Cheers
Phil

[GaryR]

Don't they make ceramic discs for the SC yet? Seems like 997TT calipers, a Tilton pedal set with dual master with bias adjuster in the cockpit, and 997TT ceramic rotors would slow it down pretty well, especially on the street. Maybe get one of those wings off a Veyron that deploys under braking too... can never have too much brake on an SC!

[wildcat077]

Originally Posted by GaryR

Don't they make ceramic discs for the SC yet? Seems like 997TT calipers, a Tilton pedal set with dual master with bias adjuster in the cockpit, and 997TT ceramic rotors would slow it down pretty well, especially on the street.

You seem like a funny guy ... for what it's worth smart ass,i don't drive my car on the street anymore !
Keep your remarks for Rennlist ... oh yes i forgot,you left there forever ... or did you ?

[GaryR]

Thanks, but my remarks go wherever I want them to champ. To clarify, as you seem a bit befuddled, if it was you I was talking to I would have quoted you, I was responding in general to what I think is supreme overkill to the OP.

[Madsimilius]

I just don't understand why people always have to comment and say it´s stupid to want bigger brakes ? If i want big brakes i buy big brakes, if you don't like it you don't have to tell me. From what i've heard the sc brakes aren't good enough for a 250bhp engine in track use, even with the best rotors and brake pads. I´m running 1,2bar on a EFI tuned and ported 3.1 and if i want to keep the car street legal in norway i''ll have to upgrade the brakes when tuning car that much, and i also think the bigger brakes look cool

[Madsimilius]

Hmm Tilton pedals seem interesting, any good solutions for tilton clutch and brake pedal?
I think i´ll end up buying 996 turbo brakes and the Fabcar dual master cylinder . A bit pricey but oh well.
I'm not very used to 911 cars and haven't driven it on track yet, my car is to much for me to handle for now, so i'm taking the brakes and brake bias seriously.

[safe]

What kind of rotors will you be using?

[KTL]

Originally Posted by Madsimilius

Hmm Tilton pedals seem interesting, any good solutions for tilton clutch and brake pedal?
.

Check out what Carl did on his RSR hotrod.

Another RSR build - The begining

[Madsimilius]

Thank you or the advice Kevin! very cool thread to

Safe, i't depends on what calipers i buy, 996 turbo rotors with turbo calipers, and 996 N/A rotors with N/A calipers. If you are going to do a big red upgrade to , you can use 996 and 993 rotors with modified EARLY 944 front wheel hubs. If you don´t want to use the hubs, you can use rotor hats with a different offset and 993 turbo 2 piece rotors for turbo calipers , and if you want to use N/A you can probably find hats and rotors for that to (wilwood or some other brand)

[safe]

Originally Posted by Madsimilius

Safe, i't depends on what calipers i buy, 996 turbo rotors with turbo calipers, and 996 N/A rotors with N/A calipers. If you are going to do a big red upgrade to , you can use 996 and 993 rotors with modified EARLY 944 front wheel hubs. If you don´t want to use the hubs, you can use rotor hats with a different offset and 993 turbo 2 piece rotors for turbo calipers , and if you want to use N/A you can probably find hats and rotors for that to (wilwood or some other brand)

I already have 930 brakes, but whats the difference between early 944 hubs and 911 hubs?

[Madsimilius]

I think they have a different offset that when you put the rotors over the hubs they will be placed right. The rotors won't fit directly over the hubs, so i'll have to machine them a little.
Some info here How to mod front wheel hubs for bigger brakes

[safe]

Originally Posted by Madsimilius

I think they have a different offset that when you put the rotors over the hubs they will be placed right. The rotors won't fit directly over the hubs, so i'll have to machine them a little.
Some info here How to mod front wheel hubs for bigger brakes

OK.
On my 69 I machined a pair of 911 hubs (from a 75 I think) and used 993 rotors and 928 S4 calipers.
No need to go any bigger than 993/930, plenty off stopping power there for track use.
I can still use 15" rims, I need high ET rims and spacers to clear the calipers, smaller 930 calipers would have been better.