I havent been surfing much lately, and Dean just directed me to this thread, I would be glad to put any roumors to rest if any get started. But all involved seem to be pretty well informed.
jdub;1362259 said:
The 6 piston is a superior caliper with differential bores iirc. They provide a different lead bite on the pad vs the 4 piston to reduce wear and squeaking.
That is exactly correct. These calipers are very specific based on being in front of or behind the axle changes which caliper you would use.
jdub;1362259 said:
You do realize the 6 and 4 piston calipers use the same pad, so don't expect any additional stopping power out of the 6 piston version. It's a matter of caliper quality, feel, and reduced pad wear that give the 6 piston an advantage.
You are partially correct here, but what I found on the track and in testing was in an ALL-OUT stab fest (standing on the brakes as hard as you can with ABS) the 6 pistons were able to haul the car down quicker ABOVE 80 mph. I have several customers that run well over 150 mph on their track days and are happy they went with the 6 pistons. On the other hand I have customers that have my 4 piston setup and push them just as hard and seem perfectly happy with their kit. It seemed that below 80 mph it was very difficult to tell the difference between the two. Yes the 6 piston does feel a little better at the limit (threshold braking) it is important to remember these are WAY better than stock brakes without being overly powerful to the point of uncontrollable.
You have to remember we are splitting hairs here, these are so much better than stock, if you have the extra cash 2 years from now you wont remember how much more you spent on the 6 pistons, you will be super happy with your performance gains, and remember that old adage. A satisfied customer will forget what he paid long before an unsatisfied customer will remember how much he was going to save.
jdub;1362259 said:
Now that I think about it, Andy has an adjustable rear proportioning valve available (not sure if it's included in the kit)...that should make the ABS vs non-ABS a non-issue.
Yea I have an adjustable proportioning valve and you can mount it right in the cockpit. It ONLY works on non ABS vehicles.
dumbo;1362291 said:
Looking at the pictures I thought the pistons looked like different sizes, but I shrugged it off as camera angle/picture. Thats an interesting point, I also did not know that, but wouldn't there be overall more surface area of the pistons which could mean more force just acting on the same pad?
No, I calculated the area of the pistons to be just a little different, I think the area is just a little larger, which accounts for the better feel (less pedal effort). Since there are 3 pistons on each side that force is distributed a little better over the pad, that and they have a differential bore which is inherently better for pad wear and all that stuff mentioned above.
dumbo;1362291 said:
Either way thats good news. Even though like IJ said theres know way street tires could have the traction to put it to use.
Many quickly learn their new limit is their tires. Honestly if you are not daily driving your Supra, invest in some crazy sticky tires once and you will be surprised at how long they last. I don't put many miles on my fast cars but when I do I don't want it to come unglued unexpectedly. Everybody is shocked at how hard my car accelerates and stops, EVEN ME!!! lol. Tires make all the difference.
dumbo;1362291 said:
I don't think there's any proportioning valve in the kit, but isn't that just a variable orifice?
It is an adjustable pressure diaphragm, it will reduce rear line pressure in a linear fashion and you can set where it starts on the fly if its mounted in the cockpit, for the stealth look you could easily fit it into the console.
