Re: Brake Recommendations Please
 

You could do grandsport calipers which are supposedly stronger.

I thought maybe the C5 Z06 brake kits will fit under stock wheels as well.

Re: Brake Recommendations Please
 

I think you need a spacer for the C5s.. unless you have the A molds.

Re: Brake Recommendations Please
 

Don't think the saw blades give you any option. 5 spokes allow for C5 brakes.

Re: Brake Recommendations Please
 

I doubt there's any reason to do any "upgrade" (your choice of word) for your car if you've got good hydraulics, good rotors and quality pads. Those with what they determine are "upgrades" are likely 90%+ of the time being done for the "bling". They can claim anything that they might like to but very few actually use the brakes. Those that do have a product that's proven it's worth and are serious "upgrades".

I doubt that with the use of the majority of the eBay adapter bracket packages that some buy there's any substantial benefit to what they've accomplished.

The C4 Grand Sport caliper is determined to be stouter in some critical areas from a design aspect but is it required for the majority of the users? Likely not.

If your car is a '91 I believe the "upgrade" to the '92+ pedal ratio could be considered a true "upgrade". If your car is a '92 then you've got the ratio and I believe I'd just relax, buy a pad that's meant for 95% of your driving. If you actually have a need for a performance pad/rotor combination, buy and install when the need arises. Simple as that, different pads/rotors for use on track days or whatever. The "bias spring" is generally accepted as being a desired modification so maybe that deserves some consideration.

Those with A-molds can buy the "bling" spend all they want to do the "show me".

Those that use the brakes have product that performs and there's no "bling" involved.

Re: Brake Recommendations Please
 

I'm a relatively new ZR-1 owner, and recently noticed that the pads only contact the outermost few inches of the rotor. Like, the pads aren't the same width as the rotor face area. Is that normal?

My '91 has new rotors and stock calipers (as far as I know). I looked at the new rotors recently and saw that much of the rotor face nearest the center isn't scuffed, isn't used.

Seemed odd, and made me wonder if I had mismatched parts. I can't think of a reason GM wouldn't use the entire rotor surface. Maybe they were worried about caliper flex?

Re: Brake Recommendations Please
 

ZR-1 (90' and 91') Wilwood Rotors and C4 to C5-Z06 Conversion

ZR-1 (90' and 91') Wilwood Rotors and C4 to C5-Z06 Front Brake Conversion with A-Molds

Specific Brake Parts by Wilwood

The KEY Element is the offset of the Rotor to match the offset of the Caliper Bracket.
This Wilwood Rotor with Z06 Caliper Modification described herein is IDENTICAL on BOTH the 90' ZR-1 and 91' ZR-1.

BLING is Good.....so is LESS BRAKE FADE :D

Also the Bearing Hub does not see near as much heat on a high speed stop when compared to STOCK Single Piece Rotors.

Re: Brake Recommendations Please
 

The fronts are 17 inch wheels in c5 Z06 but rears are 18s i believe my brother said. But rears are smaller so they might fit

Re: Brake Recommendations Please
 

Johnny5 restarted this thread this week and he wants to use his sawblades. So, I don't think he can use these options below, right?

I'm in the same situation. My track tires are mounted on sawblades (but I might change that).

Re: Brake Recommendations Please
 

The C5Z rear brakes have an drum type E Brake. Won't work on the latter C4 like the ZR-1, without some type of adapter, which uses the rear caliper as the EBrake. As WV stated, not much advantage really.

Re: Brake Recommendations Please
 

Item #14 of ZR-1 (90' and 91') Wilwood Rotors and C4 to C5-Z06 Conversion addresses that specifically :cheers:

Re: Brake Recommendations Please
 

Thank you.

If I'm understanding it correctly:

The Wilwood rotors/C5-Z06 brakes will work with sawblades if a 1/4" wheel spacer is used (to prevent the sawblade spokes from hitting the caliper).

Re: Brake Recommendations Please
 

That is what I am suggesting but the caveat is the loss of limited wheel stud length if you spaced the wheel out further as mentioned in Item #14 of the link.

Re: Brake Recommendations Please
 

I break every two hours!

I have Brembo Indy four piston calipers!

😎

Re: Brake Recommendations Please
 

Yes, I agree. That is a very valid concern.

Any comments about my post #45 above? Is that a topic that has been discussed here before?

Re: Brake Recommendations Please
 

The contact width on a J55 rotor should be something near 44mm.

Re: Brake Recommendations Please
 

Yep..............I get 1-7/8 inch or about 47 mm on the Wilwood Rotors.....
The outer edge of the pad is exactly at the outer edge of the rotor on the wildwood and maybe the pad is in about 1/16 inch inside the outer edge of the rotor on the stock brake set up.

This is Wilwood on a 1991 which is identical (by observation a few minutes ago) to stock brakes on a 1990.

http://i287.photobucket.com/albums/l...23a3816524.jpg

Re: Brake Recommendations Please
 

That is music. 6 Piston calipers with 342 mm (13 1/2 Inch) 2-piece rotors. The maximum possible size for 17" Corvette rims.

Re: Brake Recommendations Please
 

I just reached the end of my Carbotech AX6 pads, time for a freshening. With all the concern about caliper flex I was pretty surprised to run through a full set of pads and see very little pad taper. I suppose I will have to measure.

But I know my rotors are a problem both from being really heavy and beyond recommended thickness limits (had a bad re-surface and had to re-surface again). So I went with Baer Eradispeed rotors (hat style) all around. I am somewhat disappointed in the limited weight savings (2.5lbs/side) but then again since I use them heavily I did not go for the usual cross-drill, only slotted, since the holes will accumulate spider cracks after repeated hard use. Actually had to call Baer directly to get them slotted-only.

Note my car is now a trailer queen, so it's only event miles from here out.

Oh, and for Russ, I'll have to try and take some measurements of the swept area for the CT412 pad. It's a little hectic here as my wife and I try to prep for SCCA Solo Nationals next week. Afraid I'm not taking the Beast this time, got offered a co-drive in a CPrepared Fox body. Silly fun, those cars (good youtube search fodder there). Kind of like the ZR-1 on a 1st gear course power-wise, but all the time. The steering on the other hand, well in those cars that big tiller you hold is just for picking a compass point.

Cheers,
- Jeff

Re: Brake Recommendations Please
 

Jeff, good luck at the Nationals. I'll bet that's going to be a big, fun event. Can you tell us the car number, class, etc., so we can look for you in the results during the event?

Re: Brake Recommendations Please
 

Russ, I'll confess I've barely been able to walk past the Beast, no new info on the brakes. Of course these last two weeks are when work chooses to flare up in a big way.

This event is gigantic and getting more daunting by the hour. And my wife's Focus ST has these Recaros that are truly outstanding - for exactly one minute. I am not looking forward to 1600 miles, to race for 6 minutes, then drive 1600 miles home... While she stands a good chance at a title in GSL I know I'm just there to fill the field and shake the Nationals Noob syndrome. If I hit mid-pack I'll be tickled, truly wild class this is.

The fun can be followed at

Live Results- http://sololive.scca.com/
Live Video Streaming- http://www.ustream.tv/channel/SCCASolo

I'm in CP #150, running Thursday/Friday 2nd heat. That means probably around 10 or 10:30 Thursday, an hour earlier Friday. Here's a link to a pic from the Wilmington Ohio National Tour (he appears to not allow direct links):

https://picasaweb.google.com/1165117...63995910282418

Thanks for the kind thoughts!

Cheers,
- Jeff
CPrepared Cannon Fodder!