I'm currently looking into the Ford Falcon brake upgrade (and change to Ford stud pattern 5/114.3)) that was mentioned here a while ago. I'll post more details when I've looked into it further, but I can tell you for sure that the XB-XD models that were mentioned before is incorrect. It's the XW/XY that share the same wheel bearings as the 200B. 287mm vented disc and single piston slider that fits inside a 14" wheel.

BTW, Feral is dead right about the increase in wheel tyre diametre affecting braking performance. The percentage increase in rolling circumference is exactly the amount of braking ability lost. It's pretty common knowledge amongst guys modifying 4WDs who like to fit monster tyres for increased approach/departure/ramp-over angles.

What type of booster and master are you guys using?

I run ca18det front struts, brakes etc and r31 skyline castor bars. Bolt in stuff apart from putting the correct thread on your 1200 tie rods to match the ca outer tie rod ends and using 2 driver side inner tie rod ends.

Craig

im using 285mm cross-slotted ventilated VL turbo discs and twin piston VL turbo callipers
with half decent rear end this will stop a ten second drag car easily

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Should give a real good brake diameter to tyre diameter ratio!

My $0.02...

I am using the Hilux 4-spot calipers, but I am using Datto 240Z "legs". They bolt straight on, no adaptors necessary. Also, I'm using NISMO cross-drilled rotors for the 240Z. They are not vented, but they are HUGE. I'm looking at using coil-overs to be able to fit all this, since the 240Z has a slightly diffferent spindle angle. Also, it will probably require 15" wheels, but that's where I was going anyway. Should stop great.

For rear brakes, I'm using an S110 Silvia rear diff so it has stock disc brakes built-in.

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Yes, the Weight/Mass being stopped is the most important factor of all (force=mass x decelleration)
Also assuming a standard weight is being decellerated by the brake system, variations in rim/tyre sizes from a 13" (0.560m diameter tyre) to a 17" (0.670m) diameter tyre will give a braking effort reduction of 20%.

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Braking efficiency does not necessarily go hand in hand with more rubber on the road.
With the road surface area increase you get from the larger tyre, the best effect you will get is that there is less load being supported per unit area so the tyre will not wear as much all things being equal.

The actual cornering/braking grip does not depend on area alone, but on the mass per unit area of the tyre and the softness of the tyre compound. These factors determine how much the rubber is able to push into the road surface providing the friction that prevents slip.

For a constant brake setup and vehicle mass, a big hard tyre will be the worst performer and a small soft tyre the best performer (up to the point the rubber shears of the casing).
My 2 cents worth again

Cheers guys, the hilux legend idea sounds good seeming i will have hilux rear if i had them all over it would look more uniformed. what years hilux and legend did you get them off? were they new did they need modifying?

Hey mate im using 240k struts with hilux 4 piston calipers and ledgend dics

Quote:I understand the principle of leverage, but isn't the weight of the car that is being stopped a much more overriding factor? In other words, ya gotta stop 700kg, what difference does the rim diameter make? Larger-diameter tires will usually give a flatter contact patch and improve braking. Or am I looking at this wrong?