sen2two

whats the stock weight of stock brake rotors?



i been trying to find a nice looking light weight wheel. but there all around 3000 and up. wouldnt getting lighter rotors have the same effect? and much cheaper...

Signal 2

Unless you've got the big money to spend on CF or Ceramic, I think MASS is a relatively good thing when it comes to brake rotors. Not the authority and there are variables, but as I understand it, the heat energy from braking friction is absorbed, and then released to the air, by the rotors. The less mass/weight, the less they can absorb and the quicker the fade. One of the arguements against drilled rotors.

I think it's probably going to be a lot cheaper to reduce unsprung weight through lighter wheels.

herblenny

I was talking to a Supra owner who tested back to back with lighter rims and there weren't much difference in performance (1/4 mile it was .1 sec faster with lighter rims). I don't know how much I believe it the result since Supra already weighs so much and when you look at their tire size and weight, the percentage you save with lighter rims are pretty small in comparison.. But personally, I agree with Signal 2. Some NSX owners have gone with Ti rotors and saved 10lbs on rotor mass. I've heard they stop, but not sure how well it will perform in repetitive braking.



To me, Unless you are a VERY competitive racer and you are only 1/2 sec away from winning, it doesn't really matter if you are saving 1lb vs. 10lbs thru wheels and brake rotors.

sen2two

yes...but, it just makes sence to me that lighter rotors are easier to turn. as light wheels are. so wouldnt that put more HP to the wheels. but resulting in less torque? dealing with inertia and all that.



the reason im really asking about the rotors are i can get a pair of crossed drilled/slotted rotors for 150. they look nice, but i like form as well as function. i dont compete in this car. but wouldnt mind shavng of time here and there.



so does anyone know how much the rotors weigh and there size?

Mave

At the radius of a brake disc, and the weight difference involved in drilling and slotting, you will not notice the difference. If you are going to get drilled / slotted rotors, do it for braking performance, not weight.

herblenny

There are many things that play in weight and inertia. I don't have doctorate in physics but what I know is that more weights in center (rotor) vs that same weight toward the edge( wheels/tires) make bigger difference.



For that reason, unless you could drop a huge amount of weight off of rotors (like Ti rotors - 5-10lbs less) I don't think less than lb you loose by cross drilling will help that much. Its better for you to get lighter tires than worrying about rotors. Also, slots and drilling is usually for cooling not for weight saving.

j9fd3s

the function of the brakes, basically is to take the inertia/movement of the car and turn it into heat. using iron rotors, the ability to soak up heat is related to the mass of the thing. ie the heavier the rotor, the more heat it can absorb, the more you can stop.