NoPistons -Mazda Rx7 & Rx8 Rotary Forum

NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)

- 2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)

- - big brake kits (https://www.nopistons.com/2nd-generation-specific-17/big-brake-kits-55644/)

I agree on the EBC (green) pads being above par... I've put these on a miata that I personally beat the crap out of after installation through some back roads and heavy hills...those pads were fading before 5 minutes... swapped for hawks a few months later and it was night and day. The hawk race compound is loud and produces lots of dust...but it stops. I haven't tried the "quiet" race compound they have now.

The best non BBK setup I've found thus far is honestly on my protege. A set of cross drilled Brembo rotors with a ceramic pad. They stop quick, little to no-fade during basic auto-x solo II courses(40s to 1min14s max)... sometimes you need to go through multiple setups before finding the one that works the best for you. I was running GTX Dot4 brake fluid too. I'm halfway tempted to try out a DOT5 fluid in whatever auto-x car I do next.

For those who read these forums for a little bit of education. DOT5 fluid is silicon-based and doesn't absorb water like DOT3 or DOT4. DOT3 and DOT4 are glycol-based fluids that will absorb water which turns to gas thus dropping the boiling point thus causing fade. The trade off with DOT5 not absorbing the water is that it creates water "pockets" that will corrode your brakes... DOT4 is the best from my experience, but DOT5 is worth a try i guess...unless somebody can tell me why not to use DOT5?

Main problem with DOT 5 is it's compatibility with ABS systems. Obviously, most of hte RX7s produced have ABS so this is an issue.

Number two is, dot 5 is not useable with any other form, so you have to completly and ENTIRELY get all the fluid out of the system.

Third is that due to the water solulibility, the rubber seals could have issues when running a straight silicon based brake fluid.

First - Not most FCs have ABS...many do not, mine included. Most FDs, if not all, have ABS ...so that's not a concern of mine.

Second - DOT3 and DOT4 and DOT5 are not compatible. None of the different types should ever be mixed.

Third - that isn't an argument w/out fact... saying the seals "could" have an issue is different than saying "my seals had issues running DOT5".

I'd like to hear if anybody has run DOT5..and not comments from the peanut gallery, lol.

I have the Hawk HP+ pads...they stop so well. Granted it sounds like a school bus stopping:)

It was mentioned once and faded away...

Why dont you try a ducting system FC3sboy1. That would be allot cheaper to try out before a huge expense like a brake kit?

Its only 125 bucks...minus the cost of hoses.

http://www.rotorsportsracing.com/performan...ning/brakes.htm

James

Quote:

Originally Posted by inanimate_object' post='785832' date='Dec 12 2005, 03:41 PM

Ohhhhh, I've never seen that before. It's a bit stupid if you ask me - it's like the worst of both worlds.

Mark

odd you say that mercedes uses it https://www.nopistons.com/forums/pub...#>/biggrin.png the millenia and 929 do too, might be a "big car" thing

Quote:

Originally Posted by j200pruf' post='785855' date='Dec 12 2005, 04:29 PM

What about using the Wilwood aluminum hat rotors with some good brake cooling things from AWR. And Corksport has a slightly larger rear rotor kit for the FC as well as 12.4" and 13" 4 pot front upgrade, and the 13" 6 pot set-up.

Hey J9, did Paul have to make any of the parts in his FC wilwood kits or was it all stuff you could purchase from Wilwood?

yeah a custom hat and caliper bracket. bracket isnt hard, hat is. caliper and rotor were off the shelf

Quote:

Originally Posted by Cheers!' post='785934' date='Dec 12 2005, 07:44 PM

I don't agree with that statement in production car design.

example; one of the 1st gens (prolly gsl-se) has larger diameter rear rotors, but the center hub is larger so the braking area is smaller.

Quote:

Originally Posted by fc3s4utnv' post='785929' date='Dec 12 2005, 07:27 PM

I would at least try a set of hawks before you go spending a ton of money on brake up grades. Satisfieds are some good pads too, I have a full set of those on my Mx-3 with x drilled and slotted rotors, I was more than impressed with them, and the car gets nothing more than "spirited" driving.

personally i dont like hawks on the street, they are better on the race track. they dust a lot, and the blues turn the rotor faster than the brake lathe, oh and all those metal shavings rust on the wheels and the side of the car....

Quote:

Originally Posted by One320B' post='785960' date='Dec 12 2005, 11:43 PM

You can't use DoT 5 in a Dot 3 system. You have to use DOT 5.1!!!!!!!!!

BTW DOT 5.1 isn't all that it is cracked up to be. Since it absorbs so little water, the ever so little bits of residual water left in the system flash boils when you use your brakes hard and it's worse then using crappy No name DOT3 brake fluid. So becareful, That is the reason why most amateur racers user DOT4. It has the best of both worlds wtih only minor compromises.

FC3sboy1,The Porsche Boxter S has a 4 pot rear caliper(Brembo) with small diameter pistons. If you go with a 4 pot front caliper in the rear it could require more brake fluid than your master cylinder can supply.

If i recall corectly, the rx8 front rotor is pretty large, you may be able to use those with a good caliper if you have the ability to fab a caliper bracket.