Hey guys,
what have you found to be the best brake combo up front for a CA or SR turbo conversion using a Hilux rear with discs up the back

i will have Stanza struts up front and 180B booster so what discs and calipers have you used?

I have a similar set up like Errols stage one Serious stoppers, twin spot Simotoyo's calipers and Mitsy Verada rotors, from memory mine are 22mm thick, slightly different set up, but the same principle as what Errol is using. Works well on my Sunny rally car with Bendix Metalkings, all this is fitted on a Stanza leg.

Will that be enough stopping power for a CA18DET?

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For a static assembly (not taking into account suspension motion) and constant pressure of brake fluid, brake performance depends primarily on these items -
1. Caliper piston area
2. Pad friction material area
3. Coefficient of friction of pad material within a temperature range
4. Effective clamping diameter of the friction material
5. Type of disc material.
6. Temperatures of disc and pads.

If you use larger rims on the above setup, then brake performance will deteriorate. If you must use larger rim/tyres on your car, then use proportionally larger discs and calipers to maintain brake performance.

Also as rim/tyre size goes up, so does unsprung weight and the ability of the tyre rim comination to follow the road surface without skipping on bumps. Large/heavy rim tyre setups and small stock brakes are the cause of a lot of crashes in performance vehicles.

I have a spreadsheet with a bit of comparitive brake data that is a bit of a surprise.

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?

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

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?

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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

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