My hot new BBK!
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My hot new BBK!
Just got these from VSR Motorsports (formerly S&R Performance) in Tampa! They're 6 piston brembos. Same calipers that come on the Porsche GT3. Brackets made in house.
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Why a Big Brake Kit Won't Make Your Car Stop Faster
So you have your heart set on one of those new big brake kit upgrades for your street ride. They come with larger, vented, rotors and usually either 4 or 6 piston opposing calipers. Prices range from 800 usd to well over 1500 usd. Despite their high cost, they do not make your car stop faster, or decrease the stopping distance greatly. So what benefits do they propose?
The Physics Behind Stopping.
Physics doesn't discriminate between starting or stopping, but instead considers them both changes in kinetic energy. Thus, an object at a constant speed reacts the same as an object that is sitting still. That being said, the Standard Kinetic Friction Equation applies to stopping just as much as starting movement. In simple terms it says an object in contact with the ground will absorb the most kinetic energy right before movement, or sliding. This applies in the reverse as well: an car in motion will absorb the most kinetic energy right before the wheels lock up. With respect to modern vehicles, this equation states that the only way to make a car stop quicker is to either increase the coefficient of friction with the road, (e.g. upgraded tires) or decrease mass by lightening the vehicle. Note, both of these things have little to do with brakes.
Why Big Brakes Don't Reduce Stopping Distance.
As the physics lesson states, under braking, your car absorbs the most kinetic energy (movement) right before the tires lock up. This is true for both non-ABS cars and ones equipped with ABS. Abs shortens stopping distance by attempting to keep the brakes on the point of locking- where most kinetic energy is absorbed. Even though they have come a long way, even the most advanced ABS systems react by pulsing braking pressure resulting in a slide, roll, slide, roll pattern. In a perfect world, a perfect ABS system would perch the brakes at the cusp of sliding without ever actually locking up. Upgraded calipers and rotors in a big brake kit will result in more braking torque, the stopping force applied to the wheels. This will bring about wheel lockup or ABS intervention sooner than with the stock system. This should not be interpreted as a shorter stopping distance. In many instances the larger brakes confuse the stock ABS system which is not tuned to the different pressures required to engage and disengage the brakes.
What a Big Brake System Does to Improve Performance.
Big brake systems were not designed to stop your car sooner, but rather, stop it more efficiently and consistently. The larger calipers, vented discs, and exotic-compound pads increase heat capacity and heat dissipation. These upgraded braking systems not only perform well under extreme temperatures, but in most cases perform better when hot as opposed to average street driving temperatures. This is definitely something to consider when deciding on rotor and pad compounds. Because these brakes dissipate heat more effectively, they reduce brake fade. Brake fade occurs under high temperatures, can be caused by boiled brake fluid, and results in a soft pedal and elongated stopping distances. Big brake systems don't decrease your car's stopping distance over stock. Instead, they are designed to perform consistently under extreme conditions so that your car will stop just as well the first time as the N'th time.
So you have your heart set on one of those new big brake kit upgrades for your street ride. They come with larger, vented, rotors and usually either 4 or 6 piston opposing calipers. Prices range from 800 usd to well over 1500 usd. Despite their high cost, they do not make your car stop faster, or decrease the stopping distance greatly. So what benefits do they propose?
The Physics Behind Stopping.
Physics doesn't discriminate between starting or stopping, but instead considers them both changes in kinetic energy. Thus, an object at a constant speed reacts the same as an object that is sitting still. That being said, the Standard Kinetic Friction Equation applies to stopping just as much as starting movement. In simple terms it says an object in contact with the ground will absorb the most kinetic energy right before movement, or sliding. This applies in the reverse as well: an car in motion will absorb the most kinetic energy right before the wheels lock up. With respect to modern vehicles, this equation states that the only way to make a car stop quicker is to either increase the coefficient of friction with the road, (e.g. upgraded tires) or decrease mass by lightening the vehicle. Note, both of these things have little to do with brakes.
Why Big Brakes Don't Reduce Stopping Distance.
As the physics lesson states, under braking, your car absorbs the most kinetic energy (movement) right before the tires lock up. This is true for both non-ABS cars and ones equipped with ABS. Abs shortens stopping distance by attempting to keep the brakes on the point of locking- where most kinetic energy is absorbed. Even though they have come a long way, even the most advanced ABS systems react by pulsing braking pressure resulting in a slide, roll, slide, roll pattern. In a perfect world, a perfect ABS system would perch the brakes at the cusp of sliding without ever actually locking up. Upgraded calipers and rotors in a big brake kit will result in more braking torque, the stopping force applied to the wheels. This will bring about wheel lockup or ABS intervention sooner than with the stock system. This should not be interpreted as a shorter stopping distance. In many instances the larger brakes confuse the stock ABS system which is not tuned to the different pressures required to engage and disengage the brakes.
What a Big Brake System Does to Improve Performance.
Big brake systems were not designed to stop your car sooner, but rather, stop it more efficiently and consistently. The larger calipers, vented discs, and exotic-compound pads increase heat capacity and heat dissipation. These upgraded braking systems not only perform well under extreme temperatures, but in most cases perform better when hot as opposed to average street driving temperatures. This is definitely something to consider when deciding on rotor and pad compounds. Because these brakes dissipate heat more effectively, they reduce brake fade. Brake fade occurs under high temperatures, can be caused by boiled brake fluid, and results in a soft pedal and elongated stopping distances. Big brake systems don't decrease your car's stopping distance over stock. Instead, they are designed to perform consistently under extreme conditions so that your car will stop just as well the first time as the N'th time.
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Thanks for the compliments!! They stop well but yea, the main thing is that under heavy breaking (say from >100mph) you'll get good stopping power all the way to 0 without fade, and they'll be ready to stop again where stock will start to cook and fade.
My peak Tq is 406 ft lbs
My peak Tq is 406 ft lbs
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100 to 0, the stock brakes will do that without fade. Only time a BBK is really needed is for track use.
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^ talking about he GT series?? And terramask-come on man, street use for bbk is a good insurance saver all the time. Doesn't just need to be on the track. Stupid people pull out in front of all us daily.and faster acc---needs to stop faster-only an advantage no matter how you look sy it.
Last edited by taywan; 07-14-2013 at 06:51 PM. Reason: ^^ at
#20
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^ talking about he GT series?? And terramask-come on man, street use for bbk is a good insurance saver all the time. Doesn't just need to be on the track. Stupid people pull out in front of all us daily.and faster acc---needs to stop faster-only an advantage no matter how you look sy it.
Difference in stopping distance between oem and 14" ST40 BBK from 100 mph is 6 feet or 1.8%. However temp difference is 204 degrees, or 26% improvement. Are you that good and consistent with your braking that you can feel and actually exploit the 1.8% improvement? Most likely not and even if you can, you probably would not be buying a budget "sports car" for spirited public road driving. Sport Compact Magazine reported a Z33 stopping from 100 to 0 in less than 100'. It wore Brembo 6/4 pot GT [which includes a bracket designed from Brembo and not a performance shop], pagid brake pads, and R compound tires.
The last bit of braking improvement can be gained by increasing the rear braking bias. Plus... 6 piston fronts and 1/2 pot rear looks ridiculously stupid.
On another note.. the calipers do look sexy. Changing pads must suck.