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Project V8 RX-7 Rockebunny RX-7 Stoptech Trophy Big Brake Kit

Project V8 RX-7:  Wheel, Brake and Tire 3 PART MEGAPOST!

Part 2 - Stoptech Big Brake Kit

by Jeff Naeyaert

Ever since our projects, Project FR-S and Project STI got the Stoptech Trophy kit on them and we felt how amazing and confidence inspiring those brakes were, we HAD to have them on the FD.  After all, it IS our flagship project and that nickel finish is just way too bad ass and EXPENSIVE looking!  Stoptech makes a Trophy Big Brake kit for the FD RX-7 and those are the brakes that we alluded to in the last article our wheels needed to clear!

Fortunately we don’t have to guess or hope they'll fit; Stoptech makes wheel fitment templates you can print, cut out and check your clearances against an actual wheel.  We don’t have any actual wheels in our possession yet so that won't help us find out if that Super Low center disk on the SSR Professor SP4's will clear the front brake calipers, but the folks at Tanabe/SSR were able to confirm that the Stoptech calipers will clear the main part of the wheel.  There MAY however be interference with the valve stem, which on the SP4 is screwed into a hole in the rim just behind the disk face. This didn’t seem like too big of a deal; if it didn’t fit we could plug the predrilled hole in the rim and drill another on the barrel in front of the face even though that technically isn’t advised from Tanabe/SSR (so don’t try that at home!)  

The FD RX-7 came with pretty good brakes from the factory, for the car it used to be, especially for the time.  But with nearly twice the power and a lot more rotating mass, the stock parts start to show their limitations.  Anything more than normal road duty and the small stock brakes will overheat—boiling brake fluid, fading pedal feel and frying wheel bearings.  Stoptech’s larger diameter and wider rotors have improved ventilation and larger swept surface than the stock parts to dissipate heat better.   Larger and stiffer calipers allow a bigger brake pad to be used for more clamping force and better modulation and control.

 

What a beautiful kit!  The Stoptech Trophy front and rear kit comes with everything needed to upgrade your stock brakes.  Your only requirement is wheels that are big enough to clear them!  

FD RX-7 Stoptech Trophy big brake kit front caliper rotor pads and lines

The front half of the Stoptech kit includes 4 piston calipers, brackets to mount the calipers in the stock locations, 2-piece floating 332x32mm slotted AeroRotors, pads and stainless steel brake lines.

Stoptech FD RX-7 Trophy Big Brake Kit Rotors and hats

Stoptech's Aerowave rotors have a proprietary low-turbulence airfoil vane design to improve airflow through the rotor.  They are directional so the rotor on the other side of the car isn't backwards.  

Stoptech FD RX-7 Trophy Big Brake Kit Rotors and hats

The hat is hard anodized for corrosion resistance and also has vanes to increase airflow between the hat and rotor reducing heat transfer to the hub and wheel bearings.  You can also see the rotor's vanes are staggered so every other vane sticks out a little farther than the adjacent vanes.  This design further increases airflow through the rotor helping extract air more efficiently from the hub side outwards through the rotor. The rotors are floated to help avoid warpage and caliper piston knockback and can move about 0.012". To keep them from rattling the allen bolts used have countersunk inconel conical washers that allow some movement but keep tension on the assembly to prevent noise. This is a really cool feature.
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Comments
GasInMyVeins
GasInMyVeinslink
Monday, July 13, 2015 4:58 AM
Look into flush mount valve stems for your clearance issue. It's basically a removable metal stem and a base to screw into. It's probably a pain to use, but better than drilling into your new wheels.
M-P
M-Plink
Monday, July 13, 2015 5:26 AM
My FD is jealous.

Also, impact screw drivers are awesome! Ask anyone who has taken apart a Kawasaki KLX 110 engine.
8695Beaters
8695Beaterslink
Monday, July 13, 2015 5:38 AM
Oooh I like the tip of using a small mallet to tap air bubbles loose. Never heard that one before.

And as always StopTech's brakes look stellar. A shame they don't make a 4-wheel kit for the S-Chassis yet.

Edit: I'm wrong, StopTech DOES make an S-series brake kit, but not all places list it as such because it also fits the R32 and Z32 chassis.
JB77
JB77link
Tuesday, July 14, 2015 4:09 AM
Like GasInMyVeins said: had flush mount valve stems on my Antera 309 wheels and they worked great, without any issues whatsoever in the 6 years I had them. And those wheels were used hard every day, occasionally on track even...

Jeff Naeyaert
Jeff Naeyaertlink
Tuesday, July 14, 2015 1:00 PM
a flush mounted valve stem would probably suck on these wheels. the hole is in the inner barrel right behind the disk so you can't see or access it easily on the car...
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