Quote:
Originally Posted by caduprado
Drew, first if all, congratulations on the work and effort. It's definitely a master piece. One thing I've been wondering, though, is the balance between front and rear brakes... Won't the difference between them be too big with this bbk in the front and oem brakes in the rear?
Thanks and, once again, congrats!
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Caduprado,
Thanks for the interest. The short answer is No, not at all. There is a reason I selected the calipers that I did. They absolutely work seamlessly with the OEM rears, or evo X rears.
The technical answer....
When calculating fluid displacement using piston area in a fixed versus floating caliper, you have to double the area in the floating caliper. The reason for this is that the pistons move twice as far in a floating caliper as they do in a fixed caliper. This is hard to explain with words, but think of it this way. If there is a 2mm gap on each side between the rotor and pad, the fixed caliper piston has to move 2mm to push the pad against the rotor on one side. The 2mm on the other side is closed by the piston on the other side of the rotor. In a floating caliper, the piston is only on one side. That piston on one side has to move 2mm to close the gap on one side, but there is still the 2mm gap on the other side. So the floating piston has to move an additional 2mm to close that gap, as well. So you can see that the floating pistons have to travel twice as far as the fixed pistons. This is why you double the area. Now to the numbers...
OEM RA fronts are 2 piston (43mm x2) in a floating caliper.
X fronts are 4 piston (46mm x2, 40mm x2) in a fixed caliper.
My Brembos are 6 piston (38mm x2, 34mm x2, 30mm x2) in a fixed caliper.
RA piston area: 23235.22mm2
X piston area: 23348.32mm2
My kit area: 21991.15mm2
As you can see, there is about a 5% difference in front area alone between mine and the RA.
Now for the rears..
OEM RA rear area: 9072.92mm2
X rear area: 10053.10mm2
So OEM RA has a 2.56:1 front bias
OEM X has a 2.32:1 front bias
My BBK/RA rear has a 2.42:1 front bias
My BBK/X rear has a 2.19:1 front bias
All of these scenarios work absolutely perfect with the OEM system. Long winded answer, yes. I just wanted everyone to know that this isn't something I just threw together. I put in far too many hours of research to make this kit as perfect as it could be. Hope this answers your question. But the REAL answer is, ask anyone that has the kit, and they will tell you what the data supports. It works perfectly.