Nismo Big Brake Upgrade

[Kouks]

Considering the nismo BB Upgrade(q45 rotors and calipers) instead of the traditional z32. Complaints of brakes locking up are abundant with the z32's. Does anyone have this upgrade that could give some advice. I have a 90 soon to be 5 lug.

also z32 brakes 10.9? versus q45 11.0?

[Fenvy]

I dont have nismo but I have the q45 brakes

it does lock up too

only advantage I can see is that it is cheaper, no figment issue and doesn't require conversion line

[e_c]

also, correct me if im wrong, but the only reason the brakes should lock up, is if your braking force is exeding you tires maximum frictional force...

[naed240sx]

Isnt it good to have the ability to lock the wheels? Not that you stop faster with your wheels locked, because the quickest braking is right before lockup, but If you can surpass that point, you know that you can definately equall it. Unless yall are talking about sudden lockup not caused by the driver, which would be very bad

[Fenvy]

once you lock, you slide instead of slowing down

correct me if I am wrong, this is from my experience

[masticatingcow]

One reason the Z brakes will be more sensitive and therefore more easily locked up is that many people don't install the Z32 master cylinder. It has a larger diameter, which increases the usable pedal movement, and gives the driver a little more control, especially at the limit.

[naed240sx]

I know. You will not stop very fast If you lock your brakes. You will stop the fastest If you are decellerating your tires as much as possible without locking them. If your brakes are not capable of locking the tires, then they are not capable of providing braking force at that threshold. That is why I believe that it is good to have brakes that are at least capable of locking your tires.

[SeVa-S13]

I personally like it hard to to make my tires lock up, accomplished by great tires and great brakes preferably. Sliding = no good. The main advantage to slowing down while your tires still have grip (i.e. - not skidding out of control) is your retained ability to steer under deceleration, not just stopping quicker.

[SimpleEnigma]

In physics there are things called coefficients of friction, namely sliding and rolling friction. As any physics person will tell you, the coefficient of rolling friction is a lot greater than that of the sliding friction. therefore, you stop quicker as long as your tires remain rotating. the second you lock your tires, they lose a lot of grip and you gain stopping distance. e.g. the whole point behind Anti-Lock Brakes.

The best way to decrease stopping distance is get a great set of tires, since they are what actually stops your car and not your brakes.

However, having a nice solid brake setup certainly improves the ability of the car to decelerate when used in combination with an adequate set of tires.

Lastly, just for FYI, the friction force your brakes apply increases the slower your tires rotate, which is why you can press the brake harder (to a point) at high speed than at low speed and not lock your wheels.

[Fenvy]

does front/rear braking ratio have anything to do with it also?

again, this is again from feeling

I have q45 front and stocker rear. I know most of the braking is done in the front but having stockers in the rear seems to result in excessive transfer of weight to the front and braeking the original ratio. I think z32 rear would combat this?

[e_c]

or maybe even just upgraded pads in the rear, the reason that all the wieght is being shifted like that is due to the high braking force of the new brakes over stock... and if new pads in the rear dont work out, then you always have the option of upgrading the whole rear set up later

[Fenvy]

I have axxis ultimate all around, pads are upgraded but still isn't enough

I was going to buy the z32 rear from ev_ something but turns out to be too expensive since the fitting for the brake line is different

[naed240sx]

I have axxis ultimate pads in rear, stock brakes. 205/55/16, 225/50 in rear yoko es100s. I can lock all 4 tires at around 40. I don't think people understand what I am saying. It is definately BAD to try to stop your car by locking up the wheels. You stop the FASTEST when you are not locking up the wheels, but are as close to locking them up as possible. If your brakes are not capable of locking up your wheels, then they are not capable of providing enough friction to have your wheels on the edge of locking up. It is up to the driver to brake at that point.

I think it is good if your brakes can lock up the tires. Not because you should stop that way, but because if your brakes can do that, then they can definately do less.