snipaz2420

hello all i was just wondering if anyone knew if the 328mm bbk from Stoptech offered any kind of weight loss. i remember reading Polak's review of the Racingbrake kit and that kit shed something like 26lbs off the front and 9lbs in the rear because of the rotors. will the Stoptech be similar to the Racingbrake in losses? Grazie

Razz1

Check out their Website. If I remember correctly they do save a little.

Performance wise there is not brake kit that beats the performance of stock.

Stoptech will reduce the fade. Only good if racing. Speedsource racing uses them in GT.

No feedback on performance yet on the RB and the ones from Stillen.

snipaz2420

thanks razz. i checked their site and it didnt have any info about weight. mainly info on brake fade, cooling, and stopping distance. i may track the car in the future so i think it may be a good investment.

SolarYellow510

Grand-Am Racing brake system breakdown:

I believe SpeedSource uses Alcon on the three-rotor GT cars. It's really beautiful, trick, pin-drive $tuff$, and not suitable for street use. GT requires a true endurance racing brake system due to the race lengths and requirement of being weight-optimized. StopTech's currently-available calipers, designed for dual duty on street and DE/race cars don't fit these requirements well.

In GS, StopTech works with Turner Motorsport, which won five of 11 races in 2005, the championship in 2006, and is currently leading in points after holding off a 997 by the strength of the M3's brake system at Three Rivers, considered by many to be the hardest track on brakes in North America. Every 350Z in the series uses StopTechs.

In ST (where SpeedSource runs the two-rotor cars), the cars must use stock calipers, but can go to a two-piece rotor.

In World Challenge Touring Car, Tri-Point Motorsports uses StopTechs on the Mazda 6es (currently leading in Mfr. points). Randy Pobst and Jeff Altenburg talk about them on the podium.

I don't have weights for the RX-8 stuff handy. ST-40 caliper is typically about 8 lbs. without pads, about 5 lbs lighter than stock. Since the stock rotor is so close in diameter to the 328x28 StopTech rotor, the weight savings from the two-piece hat aluminum center are likely to be pretty substantial, I'd guess 3-4 lbs. per side.

snipaz2420

i wasnt sure how heavy the stock brakes were. even if those numbers are close its still pretty good. i wrote stoptech and when i get the reply i will post the info here for future reference

SolarYellow510

Checked in with my friend who works in sales at StopTech.

StopTech 28mm wide ST-40 caliper, loaded with Axxis ULT pads and typical bracket, including studs, nuts, etc., 11.4 lb. per side.

StopTech 328x28mm AeroRotor with typical hat and hardware, 13.2 lb. per side.

He told me these are typical numbers, not specific to the RX-8 components. The biggest variation would come in the bracket and hat, and those are aluminum, so the difference would be minor.

He also told me the stock RX-8 Sport rotor (323x24 ?) is about 18 lb., which I believe is verifiable on the forums here. No love on what the stock calipers and pads weigh. I know I've seen a picture of them on Racing Brake's scale in another thread, but couldn't find it easily in a search. You don't know the wear condition of those OE pads, though.

snipaz2420

thanks solar thats real good info. im still waiting for stoptech to respond but im sure i'll get the same response from them as from your friend. the thread with all the stock part weights says that Stock Front Brake Rotors - 18.5lbs each, Front Calipers and Pads - 13.0lbs each, Stock Rear Brake Rotors - 12.5lbs each, Rear Calipers and Pads - 9lbs each. so there is some weight loss which is what i'm looking for. thanks again solar

kinchu007

iTrader: (1)

So you're saying they "added" weight to the OE pads to make the comparison look better? Lost me there...

TeamRX8

iTrader: (25)

be aware that you will need a large wheel spacer to clear the Stoptech caliper, depending on your wheel/tire choice this may cause fender interference, special wheel offsets, etc.

also, I did the preliminary work ith RacingBrake and original writeup on it. I just checked the clearance on my Enkei wheel special offset BBK from RB and have at least 1/8" clearance between the rotor and spindle. I'm not really sure why Polak had an interference issue.

SolarYellow510

This depends entirely on wheel selection. You can't go just on width and offset alone, the shape of the spokes is critical.

For any given wheel, the answer is here:
http://www.stoptech.com/tech_info/wheel_fitment.shtml

RX-8 328x28 kit:
http://www.stoptech.com/tech_info/ch...48-2430-00.pdf

Download the template and check your wheels. Or Tire Rack can tell you whether any wheel they sell fits or not.

The Enkei RPF1 18x9.5 +45et that is so popular has quite a bit of dish to its spokes, which limits caliper clearance around the hub, meaning it doesn't clear StopTechs. Racing Brake created a special kit just to clear that wheel.

On the other hand, Tire Rack told me the Enkei NTO3-M 17x9.5 +44et does clear StopTechs just fine.

I have SSR Cs, 17x8.5 +42 et left over from my previous project that clear, as well as a set of SSR GT2-H 18x10.5 +43 et that clear.

I expect TeamRX-8's SSR Cs in the same specs as my GT2s would also clear, but you'll have to ask him.

Yes, the StopTech kit may be somewhat more challenging for wheel fit than other choices, but there are plenty of excellent options that work, at a range of price points. You just have to plan ahead and do some research before spending your money.

The RX-8 is a lot more forgiving in this regard than, say, an S2000.

snipaz2420

i have the template from stoptech i've just been waiting for my car to get back from mazda to check the wheels.

BRGREEN8

you need a 15mm spacer if you are on stock 18s.

snipaz2420

im not running the stock wheels so it wont be necessary. i checked the wheels with the template today and they will fit but it doesn't get the required 2mm space that stoptech recommends so i would probably put a 4-5 mm spacer just to be safe. now i just need the funds

TeamRX8

iTrader: (25)

and some good sense ....

snipaz2420

that always helps to

PhotoMunkey

Polak claimed a "wheel bearing issue" was the cause.

The new 6-piston RX-8 kit I'm currently developing will use a 4.5 lb caliper without pads, if that's worth noting. We're also looking at a 330x31mm rotor which weighs 12.3 lbs before hardware. Titanium attachment hardware will be available if wanted.

Oh and should fit behind stock wheels, no spacers required. And not to be mean, but I'm hoping to price the kit about $400 less than Stoptech.

Now what remains to be seen is if I can actually deliver all of this by SSX!

StopTech

FWIW, SolarYellow510 reported the weight data accurately.

We're not always watching you, but we do pay attention once in awhile.

california style

how come?