D2 Racing brakes

[ZAP]

We are NOT talking larger rotors, but more pistons on calipers.

If you can generate enough pressure to lock the wheels the amount of pistons have no effect on the braking distance, nor will pad size.

Your example at Sandown is more to do with performance when used on a track not stopping distances in a single application.

Bolt a set of slicks on your car and see how long tyres make a difference to stopping distances in turn 1.

[dule]

I'm with zap on this one...

Big brake setup will NOT reduce your stopping distance from a one off stop as standard brakes have enough power to lock the wheel.

Track work and continues stopping is a different story as small brakes will overheat quickly and are not very useful at such state.

The only possible change in stopping distance with bigger brakes could be caused by the calibration of the ABS, as adding more pad surface or higher friction coefficient pads may slightly change the ABS behavior and in turn affecting the stopping distance, this is a theoretical possibility only and I have no idea if it would make any difference in practice.

Saying bigger brakes stop you quicker is like saying you would take off better in the rain if you had 500 rwkw instead of 300.

[radicalxr6t]

Who wants brembros when you can get these babies..

[Erko]

yep, ZAP and Dule are on the money.

[Sprjenkins]

No they're not, not even close.

In a single application, discounting repeated stops, bigger brakes will most definately reduce you stopping distance.

When you put bigger calipers on you are increasing the pad area over your standard brakes therefore increasing friction.

Whether you can exert enough pressure to lock the wheel has little affect on your stopping distance. What determines your stopping distance is how much friction you can exert below the pressure threshold to lock the wheel.

ABS detects a locked wheel and backs off the brakes. Putting bigger brakes on will not affect ABS, in fact it makes it more effective.

I'll give you an example, if you were to push a thin metal spike onto a linishing machine(belt sander)you would have little affect on slowing the belt, shove it on with enough pressure however and you will stop the belt though. You cant exert enough friction to make much difference before locking up the belt.

However if you had a big steel block you could push that onto the linisher and slow the belt down without stopping it.

Its the same with your brakes, a small standard set of brakes doesn't have a pad area and the friction co-efficient to stop the car very well without locking the brakes.

that's why we have bigger calipers with a bigger pad surface area, more pistons for a more even distribution of force and a larger rotor for a greater rotational force.

In a single stop big brakes are absolutely, positively guaranteed to stop you faster.

[Ralph Wiggum]

oh no, not this again. Its about energy conversion mate, not friction.....

[Sprjenkins]

The energy conversion comes from the amount of friction you can apply at a given pressure.

I just shudder to think that people think they can do an emergency stop as quick with crappy stock brakes just because they can lock the wheels up and have ABS.

I hope they're not behind me

[XR6TWolf]

Putting aside the argument of whether bigger brakes will or wont decrease stopping distance the fact remains that there is a very good reason why any high end race class cars are likely to be found with Brembo, AP Racing, Alcon or similar hiding behind the wheels.

The simple fact is that if a cheap Chinese package was equal or better to the above they would be using them...the fact that they are not reflects the equally simple reality that they are inferior in almost every way.

Whilst the pretty looking D2 rotor is big there is no evidence to suggest that the rotor or the calipers are capable of withstanding anything like the punishment that the bigger name brakes have shown time and time again they can cope with.

There are simply too many unanswered questions with the D2s to even begin to consider them as a high end option.

[RAP1D]

Thing is, with all the chinese rip-off gear, they do get better over time. Just look at their turbos, used to be glued together 5 or so years ago, now guys are banging a $600 fake to4z on and getting good results, its the same with these brakes.

I dont use or sell them, and am not promoting them, but I do know guys running them on track cars and having good results, they just grind the name off the calipers... Lotus, cobra, wrx are a few hard hitting club cars I know of that run these.

I'm not saying go out and buy them, and definatley not saying dont waste your $ on Brembo/AP/Alcon/Willwood ect, but they are not as crap as poeple think, and on a budget track car can be used to good result. A track car is where I would leave them though.

[Erko]

Sprjenkins, rubbish. Your theory forgets that the limiting factor is grip. This is not like braking a farking train or applying pressure on a belt sander .

We have seen stopping distance tests in magazines bear this out. The main advantage of large rotors is heat dissipation as well . You are correct with regards to more pots means more even application of pressure.

Edited 09/10/09 08:59 AM by Erko