Check out my new BIG BRAKES!! anyone else do this yet???

[cdlong]

umm, just use z-06 rotors. those rotors are 14", cobra rotors are 13" or so. it would be easier to make the z06 rotors fit on a 240 than to make the cobra rotors 1" larger in diameter.

[holemilk00]

Just ordered a set of the vette calipers. Now I need to find someone that makes rotors that large in the right bolt pattern for our cars, redrilling a smaller set of 5 lug holes just doesn't sound safe to me, anyone got any advice for me on this? whether its "redrilling will be plenty strong enough for anything I throw at it" or "redrilling makes them weak". It would be nice to just find a set of rotors for a 240/like vehicle so the center bore wouldn't be an issue. I know with enough research I could figure this out on my own but I was just wondering if anyone had any real world experience that makes a set of rotors jump out in their mind. Once I get everything here and fab up the brackets I'll post what I come up with for whoever to use.

[Krinkov]

Originally Posted by holemilk00

Just ordered a set of the vette calipers. Now I need to find someone that makes rotors that large in the right bolt pattern for our cars, redrilling a smaller set of 5 lug holes just doesn't sound safe to me, anyone got any advice for me on this? whether its "redrilling will be plenty strong enough for anything I throw at it" or "redrilling makes them weak". It would be nice to just find a set of rotors for a 240/like vehicle so the center bore wouldn't be an issue. I know with enough research I could figure this out on my own but I was just wondering if anyone had any real world experience that makes a set of rotors jump out in their mind. Once I get everything here and fab up the brackets I'll post what I come up with for whoever to use.

hey good on ya!

the best way to do it would be just have a company like Racing Brake(where I got the 2-piece rotors in the picture) make you a set with the proper hats, though a pair of those will set you back 7-800, but they do drop NINE POUNDS EACH off the weight of the stock Z06 rotor! but the first thing you will need to do when you get the rotor is see where the caliper and rotor are going to sit on the hub, the offset might be all off to run a Z06 rotor anyways, let us know when you get it going though, Im glad people are keeping up with these projects!

[A Spec Products]

I hope you get some sick ass rears for that Vette front caliper setup.

Brake bias is gonna be crazy.

Slam on the brakes, GO DIPPPPP

[holemilk00]

I got all four corners for the vette, and I plan to run a brake proportioning valve. I'm actually researching a MC atm, so brake bias should be eliminated. The rotors are going to be either a problem of a bank buster. Trying to come in under $1200 for this just for braggin rights. But if need be I can go custom.

[Krinkov]

you know the Z06 rear 4-pots look like they have the same bolt spacing as the STIs too, and they're the same price!

[cdlong]

Originally Posted by holemilk00

anyone got any advice for me on this? whether its "redrilling will be plenty strong enough for anything I throw at it"

redrilling will be plenty strong enough for anything you throw at it.

i like the racing brake idea. you could have hats made for other rotors too, just find some that are big enough. wilwood, brembo, stoptech, AP, all come to mind.

['90RPS13]

The '05 rotor size are the following:

front: 12.8 x 1.26 / 325 x 32;
rear: 12.0 x 1 / 305 x 26

Z51 Performance Suspension:

front: 13.4 x 1.26 / 340 x 32
rear: 13.0 x 1 / 330 x 26


The '06 Zo6 rotor size's are the following:

Front 14-inch (355-mm) cross-drilled front disc brakes with six-piston calipers

Rear 13.4-inch (340-mm) cross-drilled rear rotors with four-piston calipers

Complementing the suspension system and large rolling stock is an equally capable four-wheel disc brake system, consisting of 14-inch (355-mm) vented and cross-drilled front rotors and 13.4-inch (340-mm) vented and cross-drilled rear rotors. For comparison, the ’05 Corvette has 12.8-inch (325-mm) front and 12-inch (305-mm) rear rotors, while the ’05 Corvette with the Z51 has 13.4-inch (340-mm) and 13-inch (330-mm) rotors.

Here are some bits from CorvetteMuseum.com

So far I have found a Stoptech rotor that will have a 5x114.3 Bolt Pattern with the dimensions of 355mm x 32mm Rotor. Prices start at $255 for a blank rotor minus the hat.

http://www.stoptech.com/products/rotors.shtml

[Nikeboy355]

How about just running the EVO rotors with the Z06 calipers front and rear?

['90RPS13]

Are Evo rotors the same size as a Z06? IIRC, they are not the same size.

[atom]

Why does it matter if they are the same size? You're gonna have to fab a custom bracket anyways, you can fab it to fit any size rotor you want, within reason. Using the same rotor size that the Vette uses won't negate the need for a bias valve either.

['90RPS13]

Sure you can use ANY size rotor you want, but why would you want to use something smaller then what the Caliper is intended for? Doesnt make sense to me.

[Nikeboy355]

Because you are clamping down on a larger surface area...

[atom]

Originally Posted by '90RPS13

Sure you can use ANY size rotor you want, but why would you want to use something smaller then what the Caliper is intended for? Doesnt make sense to me.

Off the top of my head:

1. Wheel clearance
2. Part availability

Theres no reason you need to use the same size rotor, especially since the 240 is a smaller, lighter chassis than a zo6. Part availability is most important IMO. Whats the cost difference between a custom rotor/hat combination or redrilled zo6 rotors (assuming I have to pay to get them re-drilled) and something off the shelf vs. the benefit of the larger rotor?

[nlzmo400r]

Im pretty sure the z06 rotor has much too high of an offset to fit on an s chassis car, but is there a way to fix this? Something like a spacer behind the rotor idea. Any thoughts on this?

[atom]

You could probably machine some spacer to put behind the rotor, I don't know how safe it is though. You also introduce some other problems:

1. You would need to get extended studs.
2. Outboard clearance is increased. This might actually be a good thing if you are rocking battleship wheels but if you actually have the proper wheels for a 240 then it'll stick out.

['90RPS13]

I think the Tophat would be different then what we need. As far as spacers behind the rotor, you would need Skinny spacer since it has to fit in the top hat, not on top of it. That IMHO would never go on my car. Seems too sketchy when I can just get rotors from StopTech and have the piece of mind. Just do the CTSV Calipers like on 3 pages back.

[lazierhobo]

did anyone actually finish the ebrake for the sti stuff?

and what is the smallest wheels you can run with the sti brembos?

[OptionZero]

stock STi's are 17's.

If you're on 16's you do'nt need brembos anyways.

[nlzmo400r]

Originally Posted by '90RPS13

I think the Tophat would be different then what we need. As far as spacers behind the rotor, you would need Skinny spacer since it has to fit in the top hat, not on top of it. That IMHO would never go on my car. Seems too sketchy when I can just get rotors from StopTech and have the piece of mind. Just do the CTSV Calipers like on 3 pages back.

I didnt know stoptech would make custom rotors. CTSV calipers are the same 4pot calipers as STi's/Evo's, not 6pot billets like the z06.

Oh, and 17s is the smallest wheel you can have to fit the brembo STi/Evo calipers. I tried putting 16s on my car, and it was hitting the top of the caliper.

[300hp owen]

wow, congrats on the c6z06 black demon ya got there, sick!

awesome thread too, this is cool stuff.
subscribed!

[mrmephistopheles]

Originally Posted by Krinkov

BTW, now that I got you all hot on finding a set of used brembos for under 1K Im going to drop this on you. You can buy Z06 billet 6-piston calipers BRAND NEW FROM GM FOR $200 EACH!!!! and it looks like it has the same bolt spacing as the brembos, haha no Im not going make brackets for these for you guys, but it would be pretty hot to see someone do it

Nice, Krinkov!
How hard could it possibly be to get custom tophats made for those 2pc rotors?

Someone should def. look into this.

[JohnC]

UPDATE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!
REAR SOLUTION FOUND!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
http://www.zilvia.net/f/showpost.php...&postcount=237

[yaba94070]

that was a bomb as job (congratz on the final product)...
never would of though to look into EVO and STI brakes...

[300hp owen]

JohnC, you could have the insides/drums of the rotors machined/lathed out to clear the Z32 drum brake parts, thats not a lot of material to remove at all.

thanks for the update, kind of a bummer though huh?

[JohnC]

That could be done but 2mm is the max allowed to remove and that will not be enough.
I actually removed nearly 3mm from the each of the e-brake shoes bases ends from the pivot side and from the adjustment screw side hoping to reduce total radius. I hope I am clear about what I did. I maxed out on the adjustment screw side, well because of the adjustment screw. It ended up ,yet again, almost fitting but I ended up with too much slack from the retaining springs. I got frustrated and gave up. Too much work
and even then I would need new springs and wouldn't know if the mechanism even works until I got it all bolted up.
Anyway, SPL PARTS for the rescue! New brembo rotors, conversion lines for Z32 rear and hawk pads UPSd 6K miles to Israel. Need E-brake to pass inspection.

[JohnC]

Yet again, Another UPdate about the rear!


UPDATE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!
Keep your Z32 E-brake while upgrading to STI calipers.
REAR SOLUTION FOUND!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


For a functional E-brake from the Z32, this is so simple!!!, and using
the STI rear caliper all you need is, did I say simple?,
the Z32 rotor and the STI calpier fits like a charm.
After I installed the Z32 setup today, thanks to SPLPARTS, I had a little thought.
the Evo rotor diam is 300mm which allows a perfect fit of the STI capliper with the OE mounting points.
the Stock STI rotor width is 20mm.
Now the Z32 rotor is 297mmx18mm. That is 3mm less in total diam and 2mm
less wide.
I mounted the STI caliper onto a complete Z32 rear conversion and what do you know, It fits PERFECTLY! no need for a spacer for the mounting holes.
The pad covers the rotors surface perfectly and centers perfectly. The shop I work with, the one that built my brackets seen in previous posts, confirmed that as long as I keep an eye on the pad width The 1mm per side difference is not an issue at all! The resident engineer did some calculation about some stuff I fail to understand and said It will work no problem as long as I pay attention to the rear pad width or just get 1mm thicker pads to start with.
Now that I found a working solution which keeps the e-brake from the Z32 and uses the Z32 rotor, I just need to get new pads and some braided rear lines and voila! a complete STI caliper conversion with front evo rotors+pads and Z32 rear rotor with a functional E-brake. It will be a couple of weeks until I get some more time to change the setup yet again but the result is worth the wait. Since braking already improved greatly with the rear Z32 assembly I believe it will even be better with the STI caliper just because it is a little bit larger and matches the front STI caliper. Did the calculations and it should be better but tests will be performed to verify. G|ot the GPS to measure distances and will also get a g-meter just for the sake of it.
Sorry for the long post but thought you should know.

Sorry for the bad pic, cell phone and it got dark.

[Gumballf355]

SWEET! Now I gotta get some STI calipers.

[OptionZero]

Are EVO and STI rear calipers the same?

Porterfield catalog lists the same part number for rear pads (AP 961).

[JohnC]

Originally Posted by OptionZero

Are EVO and STI rear calipers the same?

Porterfield catalog lists the same part number for rear pads (AP 961).

Mounting holes are completely different. I have the evo calipers also and they will
require some kind of bracket to be made. Pads for STI/EVO are the same front and rear but STI has thinner front and thinner rear rotors which means, like krinkov posted, they are "cheating" sti owner out of some pad life.