I rang around today to see how much wreckers (newcastle area) where seeling the twin piston calipers off ralliart/awd magnas for, nobody had any and most places didn't even know that they come out with twin pistons on the front, well it got me thinking if i cant buy a brake package (one easy on the wallet) i'll make one, as i have found the right disc that is 320mm and all that is left is for me to make a braket so that my standard caliper will be able to bolt straight up. If this works well i may think about producing a kit for both standard and ralliart/awd magnas and was just woundering would anybody be interested.
Thanks.

whats the point in using teh standard caliper on a bigger rotor??

u dont gain anything NO addition contact area between pads and rotor

pls let me know if i am wrong

i am interested in teh part no of the 320mm rotor

You do gain braking power over the standard rotor size because there is more area around the the disc the pad touches more of the disc each rotation.

How would the calibers fit on the larger rotor? The curvature of the disc wouldn't fit into the caliber properly. So the pads would have even less contact onto the rotor than original. It ain't gonna work. Larger rotors means bigger calibers

You do gain braking power over the standard rotor size because there is more area around the the disc the pad touches more of the disc each rotation.
Not only that, but coz the disc is bigger, it takes less applied breaking to stop the car. If you know physics, then you know what i mean. Just think of the extended torque wrench. ;)

this is something that i have thought of and this is why i will be testing the kit first and then if it works well will i offer the kit this is to get an idea is anybody interested.

You do gain braking power over the standard rotor size because there is more area around the the disc the pad touches more of the disc each rotation.
Err... the pad's contact area stays the same whether it's the stock size, 320mm or 900mm and besides, even if it's touching more of the rotor, the rotor is moving faster the further out you go. You'll also probably find that the pad is designed around a certain arc so it won't work as effective.

If it could be done, I'm confident it would provide an improvement over stock. Contact area is the same, but a larger disc will be able to dissapate more heat than a standard size disc. You gotta think about disc brakes as heat sinks, basically, you are converting the kinetic energy of the car moving forward into heat energy every time you apply the brakes. Ability to dissapate more heat will reduce chances of brake fade, rotor warpage, and all those other nasty problems associated with over heated brakes.

Still - I always say, if you're gonna do something, do it properly. For that reason, I wouldn't bother.

This upgrade would work the best with ralliart/awd calipers as all the commodore big brake upgrades use standard calipers with 330mm rotors and these work great, as it is only a 26mm jump from the ralliart/awd rotor to the kit i am making so all the pad will touch, yes with the standard single piston caliper you will lose about 10% contact of the pad to the disc as it is a 44mm jump, but you will have 40-50% more disc for that 90% of pad to still be touching so therefore braking should improve by 25-30%.