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PostPosted: 03 Jan 2013 22:56 
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Joined: 23 Dec 2009 10:16
Posts: 25
Location: Marton
Country: new zealand
Hi everyone, been awhile. I'm building a McRae Porsche 550 at the mo. I'm setting it up for race. I've put some good brakes on it and am in the process of sorting master cylinder sizes. Obviously the car is quite lightweight, approx 650kgs, and its mid engined. Brake specs are...
Front rotors are 295mm, wilwood 4 pot calipers with 43mm pistons.
Rear rotors are 275mm, wilwood 4 pot calipers with 43mm pistons.
It's setup with a wilwood dual cylinder pedal box and adjustable bias bar. Pedal ratio is 5:1 and I will be able to get the full 1.1 inch stroke out of the standard wilwood master cylinders.
So I need to know what size cylinders to put on, for front and for rear?
I have been searching on the net for answers but I think asking might be more helpful.
Thanks in advance.
Brad


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PostPosted: 04 Jan 2013 04:12 
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Joined: 05 May 2010 10:46
Posts: 327
Country: UK
As you are using all wilwood gear I'd suggest you ask them - surely thats what you/we pay money to these people for.


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PostPosted: 04 Jan 2013 22:07 
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Joined: 04 Jul 2005 13:25
Posts: 1209
Location: Lower Hutt
Country: NZ
A smaller master cylinder will need more travel but will give more braking pressure.
A bigger one will do the opposite.

Trial and error?

If it were me, I'd get the parts from pick a part.........everything.

Steve

_________________
6G72 mivec Twin TDO5 20Gs up and running.
6G72 mivec bored and stroked to 3.4 litres...Frankenmitsi build
6G74 mivec bored and stroked to 3.9 litres....Frankenmitsi build.
6G75 under construction....4.2 litres bored and stroked.Another Frankenmitsi.


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PostPosted: 04 Jan 2013 22:29 
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Joined: 05 May 2010 10:46
Posts: 327
Country: UK
0.625" for the fronts and 0.700" for the rears would be a good starting point.


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PostPosted: 05 Jan 2013 20:31 
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Joined: 08 Mar 2010 07:31
Posts: 332
Location: Auckland
Country: New Zealand
magn1t wrote:
If it were me, I'd get the parts from pick a part.........everything.

If you know of a pick a part that has cars with wildwood brake set ups on them, please share magnut :lol:

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regards

Peter Lee
Broomfish Automotive Parts
http://www.broomfish.co.nz/shop/


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PostPosted: 07 Jan 2013 21:44 
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Joined: 04 Jul 2005 13:25
Posts: 1209
Location: Lower Hutt
Country: NZ
Well not Willwood but find a 2nd gen GTO at pick apart and the front brakes are bigger. Would they be any less effective?
For master cylinders you could use the correct size clutch master cylinders or even adapt trailer master cylinders from supercheap.
Ideally though the brake question would be better directed at Willwood, hopefully you get what you pay for?

Steve

_________________
6G72 mivec Twin TDO5 20Gs up and running.
6G72 mivec bored and stroked to 3.4 litres...Frankenmitsi build
6G74 mivec bored and stroked to 3.9 litres....Frankenmitsi build.
6G75 under construction....4.2 litres bored and stroked.Another Frankenmitsi.


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