Your engineer should be asking for disc brakes equivalent to that of the donor vehicle.

For your own safety, at the very least, you should be lookong to get the Metro set up. They are cheaper than an 'S' set up and are a far superior option.

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But he's thriving and striving and hugging the turns.

I see your point, if the vehicle were the same weight. My father is a mechanical engineer, he consults from OEM manufactures like ford, MB, Kenworth, Mack, Hino etc. That is how i have drawn my conclusion. When talking about brakes, aslong as you are off the gas when appliying brakes (which you should be), you are talking about the weight of the vehicle, OD of the tyre being used, weight bias, etc etc that are the contributing factors. If you motor has 75 or 200 Hp doesn;t make any difference to how the car brakes in a emergency situation.
Up here in Qld they are very laspe on conversion rules anyway, many 808/rx3's get approved with 400+HP turbo rotaries and std brakes . I know i'm in it for my safety aswell as others, but i'm confident that Cooper S disks with the right booster/pad combo will pull the car up better than mots others on the road.

But when you have a 200hp motor instead of a 75hp one you can accelerate quicker and are more likely to be going faster when you need to hit the anchors.



As you state, mass will be the same, but velocity will not. Hey thats the reason you want a 200HP motor right?

The metro's are the go I reckon.

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"Life is not like a box of chocolates... it's more like a jar of jalapenos. Whatever you do today, may burn your arse tomorrow."

I was always under the impression QLD was one of the tougher ones. With the conversion I have done "Lapse" is not a word I would use to have described the processes. Having said that, each engineers interpretation of the guielines will vary.

Fair enough if you can get away with it but whilst you are doing it you might as well fit the best option. Cooper S brakes just won't cut it at 200kph down the back straight of QLD raceway (on lap 15). I'm sure you are aware the brakes being boosted has no impact on the cars ability to stop.

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But he's thriving and striving and hugging the turns.

cooper braker and ebc pads stop fine. i have use them on the track and didn't get any fade and thats slowing from near 170km down to 50km. big brakes on street cars are just more blings really.

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FOR SALE MInidlx, 1293, GR head, RE-13, GR worked Redline Manifold, 45 mm DCOE,pulsar dizzy , "S" Disc's, Mk II "S" box, 3.65 diff. Minator 10X6's On the loose

You are absolutely right that the braking capacity required to decelerate from a given speed is equal so long as the car's mass is unchanged.

However...
Engine power and required brake capacity are linked. If you have a powerful engine and drive hard you are putting more power into making the car go fast in the time between stops. That is you can accelerate-brake-accelerate-brake etc much more rapdily than you could with the old donk. Your brakes therefore don't get the cool down time between stops that they would have had. Brakes dissipate heat, which is energy at a given rate (energy and rate = power) so brakes have a power capacity.

So, sensibly, you should ensure that you have brakes which can dissipate energy at a rate in proportion to the rate at which you engine can put energy in. In general braking power rating should be higher than and in proportion to engine power rating.

If you just do the odd traffic light GP, you'll never need good brakes. If you go to the mountains or the track, those solid discs will be cooked.

M.

Glen,

Talk to your Certifying Engineer.

No matter what your father has said, its the Certifying Engineer's ass on the line if anything goes wrong.

Believe me, they will definately insist on uprated brakes of larger diameter, ventilated and preferable with more than 1 piston (like 4 opposing pistons!!)

As Molly Meldrum would say, "Do yourself a favour...."

Cheers,
Andrew

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"Not Speeding Officer..........Qualifying"

I have heard that you can engineer a shopping trolley with a 13B in it as long as your in QLD. Don't screw around with brakes. Brakes are very imoprtant on mini's because they are getting old and modern cars are much more braking efficent than any stock setup that was offered on mini's. just because their light doesn't mean it's not important to look into good brakes. fit the biggest brakes under your wheels you can with the best clamping force if you are considering a High perfomance engine conversion

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-doing a Degree in Mechanical Engineering,
and a few conversions:
13B Extend in a 1600
4EFTE in a mini ute (all slowly)

I'm onto you!

Why anyone would want to skimp on brakes is beyond me...

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

Another silly question time

Are you using the stardard Honda gearbox and how well do they fit.?
Fantastic job by the way, I'm hoping to follow in your lead.