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Post by AmunRoo on Jun 12, 2018 22:28:14 GMT -6
Okay, I'm getting ready to do the brake upgrade on my 03. I have the Grand Prix GXP front calipers and brackets. I ordered the Grand Prix brake lines and pads. Before I forget, I also ordered Grand Prix GXP rotors. So basically in theory all of this should just bolt on without issues? Also, is it necessary to do the back brakes as well or will I be fine with the stock Aurora rear brakes?
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tigger
Administrator 
Posts: 2,844 
Staff Member
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Post by tigger on Jun 13, 2018 16:10:50 GMT -6
I think the GXP rears are only about 1/2 inch bigger, you'll be fine with the stockers.
Bolt it up!
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Post by wfooshee on Jun 14, 2018 22:37:33 GMT -6
I assume this GXP stuff is about bigger brakes? So, a note about brake size. Bigger brakes do not add stopping power. If you can lock the wheels or engage the anti-lock, you have as much stopping power as you can have. Brake performance is traction-limited.
What bigger brakes do do (he said "doodoo!") is dissipate heat faster. If you're going to do track days with your Aurora, then go for it. otherwise, it's a waste of money as a performance enhancement, because it's NOT a performance enhancement.
If you want the look of bigger discs inside the wheels, then go for it. Just don't expect the car to stop any better.
To ward off all the comments of, "Oh, yeah?!?!? Well, why do Ferraris and ZR-1s and Lambos and all them have such huge brakes if huge brakes don't stop any better?" Just think about the speeds those cars can reach. Kinetic energy goes up as the square of speed, so stopping a 180-mph car takes four times the energy of stopping a 90-mph car, and NINE times the energy of stopping a 60-mph car. What kind of energy? HEAT!!!! Brakes convert kinetic energy to heat. That's ALL they do, and they have to get rid of that heat or they quit working! Those giant discs, sometimes in exotic materials, are there for heat capacity, not friction capability. Stopping friction is tire traction. Brakes create and dissipate heat.
I used to have a 1995 Ford Probe GT. Quick car, handled great, was the car to have in its class back in the day if you were an SCCA autocrosser. Its front rotors were smaller than those found on a Miata, but the Probe could stop better than the Miata. I know this for a fact because I did autocross it, and I know where I braked, and I know where the Miata guys braked. "How can that be?!!" say all the big-brake guys!! The answer is, the Probe had 225-50 tires, the Miata had 185-60 tires. Traction is king.
That said, the Probe could do one hard 100-mph stop, and if you tried another, you'd better have a LOT of room! The Miata could do those stops just about all day. Its bigger rotors dissipated the heat better.
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Post by sall on Jun 15, 2018 16:05:35 GMT -6
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Post by AmunRoo on Jun 17, 2018 16:43:44 GMT -6
Well, I'm running 265/40/20 Pirelli Pzero Nero tires and I'm on the expressway every day. So I definitely need better stopping power. I'm going to paint the calipers the body color in the brackets a metallic Chrome ish color. I'll be posting pictures once I'm done
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Post by sall on Jun 17, 2018 18:56:57 GMT -6
Good luck finding high heat body match paint unless you have a basic color other than white. I had the same idea a few years back. Settled on black haha.
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Post by AmunRoo on Jun 18, 2018 16:50:21 GMT -6
I was good with using a high temp primer underneath. I might go a little bit darker as the Steel blue is kind of light and almost seems like silver in the dark. anyway, I'm just waiting for parts to come in and I'm good to go.
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Post by sall on Jun 18, 2018 19:35:12 GMT -6
A lighter color will likely yellow even with a high temp primer. Guess you will find out for better or worse. Enjoy your project.
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