C5 Z06 Brake Conversion with Stock Sawblades

[Dynomite]

I have a 90' and 91' with identical Wilwood/C5 Z06 Brake Conversions as shown. A-Molds fit this conversion without any issues other than the redistribution of wheel weights. See item # 9 of ZR-1 (90' and 91') Wilwood Rotors and C4 to C5-Z06 Conversion (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-3.html#post1581564033)

The question came up regarding Stock Sawblades fitting this Wilwood/C5 Z06 Brake Conversion.

http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite2/7858eaf2-2328-4c61-8c95-9801a21b97a7.jpg

I measured a stock Sawblade wheel and found the inside diameter is about identical to A-Molds at the two critical locations of the Calipers (see 13B below).

I also measured the spoke Offset from the Hub of a Stock sawblade and found it to be .75 inch as compared to 1 inch for A-Molds (see 13A below). When installing the Sawbade wheel the spoke of the Sawblade JUST came into contact with the C5 Z06 Caliper as shown. In other words I would say the offset of the stock Sawblade wheel is 1/4 inch short of what would be required (3/4 inch vrs 1 inch).

It would be easy to place a 1/4 inch spacer on the Hat of the Wilwood Rotor but you would then be 1/4 inch shorter on the stud length for the wheel nuts which you end up with 1/4 inch less than the bit over 1/2 inch threaded contact now (as I view my Hubs with the Wilwood Rotors installed with Hats).

http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite3/f3527ea9-efed-45d9-b6e4-4c7d9edec8d9.jpg

The inner wheel Clearance of this brake setup using A-Molds was identical (90' and 91'). For OTHER wheels (other than A-Molds and Sawblades) the information below will apply.
See item # 13A and 13B of ZR-1 (90' and 91') Wilwood Rotors and C4 to C5-Z06 Conversion (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-3.html#post1581564033)for do it your self wheel measurements to determine if your wheels will fit this Brake Set Up. Copied here

13. Wheel Dimensions that will fit on this brake Set-Up.
This would be the limit of a wheel inner dimensions which would fit/clear this Brake Caliper Set-UP.
Rather than try to measure the offset and the maximum radius of the Caliper it was easier just to measure the A-Mold wheel which just clears the spokes as well as the Caliper outer radius as shown below. I would say this is Minimum Clearance. The clearances of this Set-Up is on the order of 1/4 inch on spoke and 1/8 inch on wheel inner radius so very close. There is slop in the Caliper pins riding in the bracket so this clearance is definitely required.

http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite2/89662f3a-f722-4131-a89e-e73e118729f7.jpg

A. Spoke Offset.
The Spoke Offset from hub surface is 1 inch at the widest part (outer edge) of the Caliper.
The wheel weights are located on the inner rim and single stacked.

http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite2/328395c8-bff3-4a0c-b32a-17f5166cd82d.jpg

B. Wheel inner diameter.
Two Inner wheel diameters are shown. The one on the left is the wheel diameter at the hub surface which is 15.25 inches (this would coincide with the the radius of the outer part of the caliper) . The Second wheel diameter on right is the wheel diameter at 4.5 inches up from the spoke where the inner (larger radius) part of the caliper which is larger radius sits which dimension is 15.75 inches.

http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite2/810ad20f-b469-47b9-8ad7-c85ed5358461.jpghttp://i287.photobucket.com/albums/ll142/dynomite007/Dynomite2/fa3b1a67-4a5e-4e0f-9786-954aa512f06f.jpg

[HAWAIIZR-1]

Hey Cliff,

Thanks for this info as I am finally getting around for shopping for brake upgrades. How about with the stock 90 MY wheels (what do we call these....salad shooters?) If not, I will get out there tomorrow and do some measurements. I like your setup and recommendation here. I am set on keeping the Dymag IIs what are supposed to have more room, but the 90 MY wheels might be the limiting factor that I need to give up on and get rid of. As mentioned before these are my wheels for shipping the car to all the places I keep moving to across the world, but if I have ship it without 90 MY wheels, it will be the CCW Classic 18s before the Dymag Gen IIs.

How about the rears? Any recommendations to upgrade that will fit 17" wheels?

Thanks again for all the time and work you put into all the posts. When I really think about what you have contributed in a few years it is simply mind boggling. You are the MAN!

[Dynomite]

Hey Cliff,

Thanks for this info as I am finally getting around for shopping for brake upgrades. How about with the stock 90 MY wheels (what do we call these....salad shooters?) If not, I will get out there tomorrow and do some measurements. I like your setup and recommendation here. I am set on keeping the Dymag IIs what are supposed to have more room, but the 90 MY wheels might be the limiting factor that I need to give up on and get rid of. As mentioned before these are my wheels for shipping the car to all the places I keep moving to across the world, but if I have ship it without 90 MY wheels, it will be the CCW Classic 18s before the Dymag Gen IIs.

How about the rears? Any recommendations to upgrade that will fit 17" wheels?

Thanks again for all the time and work you put into all the posts. When I really think about what you have contributed in a few years it is simply mind boggling. You are the MAN!

I did NOT upgrade the rear brakes on either the 90' or 91'.

If you upgrade the rears, let me know what you come up with :handshak:

The dimensional measurements are noted for those that want to try all sorts of other combinations for front brakes including alternate A-Molds they might find.

[-=Jeff=-]

GC,

Unless you do an add on Parking brake caliper or the Street Shop C5/C6 Drum brake conversion, there is not much to do.. Assuming you choose to keep the parking brake.

if you do the C5 fronts, I would suggest the Street Shop conversion and the C5/6 rears to match the front.

Interestingly enough, the C5 front Calipers have the same piston area as the C6 Z06 ( actually a slight bit more, the benefit you get with the C6 Z06 is a fixed Caliper over the sliding of the C5, the the piston area like I said is very close.

[HAWAIIZR-1]

I did NOT upgrade the rear brakes on either the 90' or 91'.

If you upgrade the rears, let me know what you come up with :handshak:

The dimensional measurements are noted for those that want to try all sorts of other combinations for front brakes including alternate A-Molds they might find.

Okay, sorry I assumed you had some OEM 90 wheels around since you have a 90, but you would have posted that if you did.

I don't know squat about brakes and trying to learn so just thought systems should be upgraded together despite the front being the majority of the braking power. I see that SSBC has an upgrade for the rear with Ebrake, but $1800 and not sure how well it works (also won't fit in 17" wheels). I see a ton of information on CF with the guys that track their cars for rear upgrades, but really need to consider my needs in reality. I know in an emergency even on the street we want the best brakes and bigger is not always better if not set up correctly. I'll try to concentrate on just maintaining the system for optimum performance for now. Thanks again as your information is always thorough and invaluable!:handshak:

[Dynomite]

I have identical A-Molds on both so the conversion was easy. I got the Sawblades for 91' from Daryll and was thinking they are the same as OEM on 90' but maybe not.

The Wilwood conversion with C5 Z06 Calipers are very nice and fit perfectly on both the 90' and 91' :handshak:

Okay, sorry I assumed you had some OEM 90 wheels around since you have a 90, but you would have posted that if you did.

I don't know squat about brakes and trying to learn so just thought systems should be upgraded together despite the front being the majority of the braking power. I see that SSBC has an upgrade for the rear with Ebrake, but $1800 and not sure how well it works (also won't fit in 17" wheels). I see a ton of information on CF with the guys that track their cars for rear upgrades, but really need to consider my needs in reality. I know in an emergency even on the street we want the best brakes and bigger is not always better if not set up correctly. I'll try to concentrate on just maintaining the system for optimum performance for now. Thanks again as your information is always thorough and invaluable!:handshak:

[HAWAIIZR-1]

GC,

Unless you do an add on Parking brake caliper or the Street Shop C5/C6 Drum brake conversion, there is not much to do.. Assuming you choose to keep the parking brake.

if you do the C5 fronts, I would suggest the Street Shop conversion and the C5/6 rears to match the front.

Interestingly enough, the C5 front Calipers have the same piston area as the C6 Z06 ( actually a slight bit more, the benefit you get with the C6 Z06 is a fixed Caliper over the sliding of the C5, the the piston area like I said is very close.

Thanks for the mention of Street Shop and other info. I'll check them out.

[HAWAIIZR-1]

I have identical A-Molds on both so the conversion was easy. I got the Sawblades for 91' from Daryll and was thinking they are the same as OEM on 90' but maybe not.

The Wilwood conversion with C5 Z06 Calipers are very nice and fit perfectly on both the 90' and 91' :handshak:

I read somewhere that the 90 wheels have some limiting factors, but not sure what they are and will confirm with your measurements provided. Thanks again!!

[Schrade]

Great info there Cliff...

You like the rotors? I thought there was some kind of rap against [some brands of] drilled AND slotted rotors?

[Dynomite]

Great info there Cliff...

You like the rotors? I thought there was some kind of rap against [some brands of] drilled AND slotted rotors?

These are the real deal and I have identical on the 90' and 91'.

The 91' Wilwood rotors with hats are three or four years older but identical. I bought those from someone on this Forum in used condition and had them re-surfaced. Identical C5 Z06 Calipers also. It turns out the 90' and 91' are identical in terms of offset requirements and A-molds which are also identical on both the 90' and 91'.