Stock GS brakes - effect

nope-mx3 · Post by **nope-mx3** » March 4th, 2005, 2:53 am

How much horsepower are the Stock GS brakes approved of by Mazda?

I trying to supercharge my Mx3, and get it approved and road legal here in Norway.
But, they must have papers on the brakes that they can handle the extra effect.
(Probably gonna boost max 1 psi for the approval, so the effect increase should be minimal).

nope-mx3

93SOHC · Post by **93SOHC** » March 4th, 2005, 1:25 pm

I would imagine stock gs brakes would only be rated by mazda to hold stock HP. Try contacing mazda, but i'm pretty sure thats what theyre gonna tell you

Nd4SpdSe · Post by **Nd4SpdSe** » March 6th, 2005, 3:05 pm

Isn't the braking power determined by the weight of the car?

snellgrove · Post by **snellgrove** » March 6th, 2005, 3:11 pm

should be, but if you have more BHP.. your car is capable of being faster, -much faster ! in any given situation, thus you must have brakes that can slow you down from that extra speed, in the same distance or so (or basically, in a safe manner) I would imagine..

lighten the car, then the stock brakes will be fine

but a big-brake kit wont fade like the stock system, on frequent, heavy usage... so think about getting a higher DOT rated fluid in there, along with the bigger discs / pads / calipers etc etc etc

mitmaks · Post by **mitmaks** » March 6th, 2005, 4:05 pm

i would upgrade to big brake kit

Joey's mx · Post by **Joey's mx** » March 6th, 2005, 5:42 pm

For legal things you shouldnt be going faster because your car has more power( im just saying that because we are talking about the LAW) so I dont see why you would need to put big brakes on your car for legal purposes enless Norway doesnt have a speed limit??......but i would upgrade for your own safety!!!

jschrauwen · Post by **jschrauwen** » March 6th, 2005, 7:00 pm

If your concerned about your brakes not being up to the task or not being strong enough than you might want to consider SS Teflon brake lines. Eliminates all flex and hose expansion that occurs after prolonged or aggresive braking which feels like spongy brakes to the driver. Dramatically reduces the the amount of brake pedal effort required to attain necessary stopping ability. It's been a must for all my motorcycles for last 20 years. If, after all that you still feel that your brakes are still not doing the job, than take it to the next level with upgraded rotor and caliper replacement. This along with the previous SS lines and you've got best you can get............IMHO.

nope-mx3 · Post by **nope-mx3** » March 7th, 2005, 2:56 am

The problem is that I wont get a bigbrake kit approved here, unless it comes for the Mx3 by Mazda.

I have Goodridge SS brakelines etc.

So all I need to know, is how much Mazda approves that the original brakes can handle, and I believe that that should be more than stock effect, as you wouldnt have any margin for error otherwise.

That way, I can boost it as little as possible to get almost no increase, get papers on the small increase in effect, get papers that state that the brakes can handle it, and then get it approved. later, I might up the boost and of course get bigger brakes.

Neverteless, Im not gonna run any more than max 7 psi anyway.

nope-mx3

kiwi_MX3 · Post by **kiwi_MX3** » March 7th, 2005, 4:10 am

Hmm,

In the power upgrade stakes, for low volume certifcation in NZ
the brakes in the car have to be equal or greater than the brakes
of the car you took the motor from. ie V8 into a straight 6 or 4 cylinder.

oh and pass the brake fade test. three high speed stops....

Simply put you an't changing the mass of the car by much the stock
system will cope, or swap the master cylinder for the 929 one....

Ie you could swap the calipers from a MX6 into the MX3. or are they the
same size?, find out what size calipers are on the Supercharged millenia.
and you can argue your case of your engine is the same HP output of the
millenia..

jschrauwen · Post by **jschrauwen** » March 7th, 2005, 7:49 pm

Sounds like some of you have to jump through a lot of hoops just to do a few mods. Lots of government intervention/regulations involved - doesn't make for a healthy after-market system, does it? Although I guess there's one plus, mostly all non NA Spec MX's were fitted with some nicer appointments (fog lights, body cosmetics, headlights, emissions, etc) that never made it to our shores.

kiwi_MX3 · Post by **kiwi_MX3** » March 8th, 2005, 2:09 pm

Actully, there an't that many hoops to jump through as the rule book
which is online is very good! and there is a lot of wild rides out there.

Its not dracionian rules that are the problem just peaple exspecting to
fit blown 454's into wee escorts and stop on a dime.

aftermarket stuff is good, though mostly for Honda or V8, but mini
trucking is taking off big here, with a lot of ride's on airbags.

Macen · Post by **Macen** » June 6th, 2005, 11:48 am

Today my friend painted his Brembo front discs. He has a Mazda 323 Sedan 1.8 DOHC from -97. I found out that he has the same size on the front discs as the MX-3. The calipers are the same. The difference is that his pads are wider, and therefore use more of the disc than the pads do on our discs.

Now to the question. Will it be a good idea to get the same pads as my friend has? I know that it will change the brake balance, but I can't see any problem with getting a bit more stopping power at the front.
The 323 weights the same as the MX-3. And it has drums at the rear.

Gro Harlem · Post by **Gro Harlem** » June 6th, 2005, 1:05 pm

I've never heard of brakes being "approved" for a certain HP figure.

It makes absolutely no sense anyways. Brakes stop the car...they aren't related to the drivetrain.

If the engine were to increase your top speed significantly I could see something to that effect but simply supercharging the engine won't work your brakes any harder than a stock engine.

nope-mx3 · Post by **nope-mx3** » June 6th, 2005, 1:16 pm

Stock brakes is usually approved for a maximum amount of horsepower.

I know lots of people here who had to get papers on what the brakes were approved for by Mazda.

More horsepower equals more acceleration meaning more need for more stopping force.

nope-mx3

jschrauwen · Post by **jschrauwen** » June 6th, 2005, 6:44 pm

Sounds a lot like when I was in Germany. There are numerous regulations as to which modifications can and can't be done. Even the simplest things like changing tires and wheel sizes were strictly regulated even so far as to stipulate as to which brand and tire size were permissable and which were not. So, it's very understandable that brake rating capabilties are directly tied to the maximum power output of the vehicle, of course vehicle weight will be a major factor. And I think I can see where Macen is headed, ie to remain with a genuine mazda parts (brake rotors/calipers/pads) that meets or exceeds the minimum requirements of the rated output of the engine (or output of upgraded mazda engine) and still be legal. If I'm reading Macen correctly.