Maintain Brake ratio with Big Brake kits ?

[Nicko500]

Hello,

I was wondering how the brake ratio can be the same using bigger rotors only on front wheels ?

http://www.z1motorsports.com/p...d=141

On Z1 Website we can read :

The additional 2" of rotor diameter vs. stock (11") provides a significant gain in braking leverage which is very evident when the brakes are applied - less force is required to produce the same braking power

This kit uses stock calipers which are balanced to the rest of the braking system. The stock calipers are more than adequate to provide the clamping force necessary but with a larger rotor they actually dont have to clamp as hard to produce the same braking force

and finally :

Quote »By using stock calipers, the entire braking system stays balanced and stock pedal travel is maintained[/quote]

So if I keep stock rear brakes, my car will brake more on front wheels right ?

Can we change that ?
Modified by Nicko500 at 5:24 AM 11/15/2009

[Z-owned]

The z's main braking power comes from the front wheels as it is it's how it was designed.

[Ace2cool]

It's like that on basically all cars. When applying brakes, weight is transferred forward, so if there was 50%-50% braking, the back wheels would swing out even easier if you were to brake in a turn. Ideal braking is 70%-30% front to rear, generally. The formula for ideal braking also involves the car's weight distribution, though, and is adjusted accordingly. Since our cars are heavy up front, bigger brakes up front would be a step in the right direction.

[OUKNO]

it is definitely a noticeable difference from oem to 13 big brake set up my Z stops much easier and it is less force as describedmy set up is mitsubishi 3000gt front rotors stock calipers with relocation platesmy buddy gave me the relocation plates that he purchased for $140 years ago but never used, they are so simple I could make sets and sell them for $40 no problemyou can pick up the rotors from a local dismantler for probably $40 as wellthough their not drilled/slotted its a great difference in stopping for sure BB

[Nicko500]

Thanks for the info Oukno, can be a cheap but good solution You used 313mm ones ? Disc offset is the same ?

But about brake ratio :If Nissan set a stock ratio of 70-30%, when you change front brakes they will brake more, and maybe your ratio will become 85-15%

That's why I wondering if there is something to do to keep stock ratio.

[Ace2cool]

The most common way is to get the brakes off a 350Z and a set of adapter plates. However, converting the rear wheels as well would be detrimental to the overall product as far as weight goes. You won't really notice that much of a difference in braking performance with the bigger brakes on the rear, since most of the weight of the car gets transferred forward to the front wheels, and the addition of extra unnecessary weight in the back would equal more unsprung weight, which is no good for handling.

Not to mention, better front brake ratio would be better for our cars specifically, since the Z32 2+0 has a weight distribution of 59%-41% front to rear.

[Ace2cool]

Also, an afterthought of this: Nissan designs cars for comfort as well as functionality. We could have competition coilovers off the showroom floor, but a large number of people wouldn't like the way they ride when compared to a more luxurious shock absorber. The same applies when manufacturers design braking systems. They engineer for a combination of comfort and functionality. If you are looking for pure functionality, changing things up a bit might be the way to go.

If you don't mind my asking, why do you want to buy a big brake kit and yet maintain a stock ratio? Most people change things on their car because either 1) s***'s broke or 2) they don't like it and think it could be better.

[Nicko500]

If you don't mind my asking, why do you want to buy a big brake kit and yet maintain a stock ratio? Most people change things on their car because either 1) s***'s broke or 2) they don't like it and think it could be better.

I want to change them first look and performance.This should be better fitment with my 18" wheels and can bu usefull if oneday I decide to go on track

But if the change in braking ratio is worst than the benefit of bigger rotors into normal use, it would be useless in my case.

[Ace2cool]

Believe me, it's not going to hinder your braking ability.

Brake ratio is only going to be a big deal in NON-ABS cars that have a high rear brake ratio. That's because the danger would lie in the rear wheels locking before the fronts in high speed heavy braking/cornering. The worst thing that can happen in this scenario is you get a little understeer and you ease off the brake pedal until traction is restored. Even then, I believe the ABS computer will take over before it even gets to that point, so you really don't have anything to worry about. \

Big front brake kit=

[Nicko500]

Ok thanks for your reply I think I will make a try with 300mm front rotors.

3000GT rotors are cheap but I can't find relocating plates alone, do you know where to find them ?

Or I will buy Z1 13" kit.

edit : Regarding the plate price I think I will buy Z1 kit http://cgi.ebay.com/ebaymotors...d95ba
Modified by Nicko500 at 4:45 AM 11/23/2009

[NolimitZ32]

Completely OT but Nicko, Nice wheels man, (are they volks or rotas?) they look great, love gold on black.