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Old 07-09-2015, 09:02 PM   #575
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Mgizzle, the ZO6 uses aluminum pistons in the rear or do they not fit the rear SS/ZL1 calipers?
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Old 07-09-2015, 09:26 PM   #576
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Originally Posted by White_SS/RS View Post
What's the cooling advantage? The ZL has arched vains to create airflow through the rotor, to my knowledge the dual cast are straight.

Same here.

If the correct bolts and machining processes are used to mate the rotor to the hat there shouldn't be a balance issue. I didn't know about the offset in the dual cast rotors, good info.

Not trying to argue, I just enjoy engineering challenges and appreciate the effort GM and Brembo go to give us the best. So consider this. Casting differences inside the vane are in millimeters, cant machine in there. On discs this big you are talking pounds different due to variation. The OD and face machining has tolerances too. But the main issue with rings, torquing bolts so disc and hat are balanced, just think about it. This is one of brake industries biggest secrets and many top brake guys have patents on this. Good luck doing it by hand.

Now rings were not big issues on race cars and tracks with low speed power etc but we are in the fastest ever times for factory cars. Corvettes and camaros now can do around 150mph and more on some tracks like road america, COTA etc. at these speeds these huge brakes can have big impacts on brake confidence, brake feel and durability if not balanced. Its so cool how technical these companies get now a days..... For $250 a rotor. A steal, trust me. Go quote a bmw m3, porsche or audi rotor.....not even true 2 pc floating design.

The new z06 calipers are equal piston sizes, all 4, on the rear calipers. I think 30mm pistons. Ours are staggered and bigger by a few mm to distribute pressure better since our rear pads are quiet a bit bigger. 34 and 32 mm i think. Vette is way lighter and better rear cooling hence ok with it ( it has rear brake ducts).

Oh, ZL1 has directonal curved vanes and thicker face plates so can take more heat. Also, has no holes between hat and rotor so cooling duct air all goes into vanes. Curved vanes creat more surface area to dissipate heat and use better air flow inside to cool better. Post pillar is not straight vane, cts V co cast is post pillar, probably worst option for air flow and results in smallest surface area.....but lightest mass wise. 2014 vette z51s had co cast rotors and came with little rings you pit on track to close out holes so rotor cools better. Google it.
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Old 07-10-2015, 10:09 AM   #577
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Found these numbers www.Iamgmparts.com seems like I could build a nice setup using them for about 1300 bucks all I would need extra is the pin kit and pads.

Caddy Parts MSRP There Price
4 20982719 CALIPER, LEFT COUPE, CTS-V, YELLOW $641.06 $330.15
4 20982734 CALIPER, RIGHT COUPE, CTS-V, YELLOW $641.06 $330.

Chevy Parts
1 20795300 ROTOR, LEFT 6.2 LITER, W/SUPERCHARGER $574.00 $295.61
1 20795302 ROTOR, RIGHT 6.2 LITER, W/SUPERCHARGER $574.00 $295.61

Not so much on ZL1 Calipers though!!!
6 20944529 CALIPER, LEFT 6.2 LITER, W/SUPERCHARGER $1,754.76 $903.70
6 20944530 CALIPER, RIGHT 6.2 LITER, W/SUPERCHARGER $1,754.76 $903.70
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Old 07-10-2015, 10:28 AM   #578
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Quote:
Originally Posted by Mgizzle View Post
Not trying to argue, I just enjoy engineering challenges and appreciate the effort GM and Brembo go to give us the best. So consider this. Casting differences inside the vane are in millimeters, cant machine in there. On discs this big you are talking pounds different due to variation. The OD and face machining has tolerances too. But the main issue with rings, torquing bolts so disc and hat are balanced, just think about it. This is one of brake industries biggest secrets and many top brake guys have patents on this. Good luck doing it by hand.

Now rings were not big issues on race cars and tracks with low speed power etc but we are in the fastest ever times for factory cars. Corvettes and camaros now can do around 150mph and more on some tracks like road america, COTA etc. at these speeds these huge brakes can have big impacts on brake confidence, brake feel and durability if not balanced. Its so cool how technical these companies get now a days..... For $250 a rotor. A steal, trust me. Go quote a bmw m3, porsche or audi rotor.....not even true 2 pc floating design.

The new z06 calipers are equal piston sizes, all 4, on the rear calipers. I think 30mm pistons. Ours are staggered and bigger by a few mm to distribute pressure better since our rear pads are quiet a bit bigger. 34 and 32 mm i think. Vette is way lighter and better rear cooling hence ok with it ( it has rear brake ducts).

Oh, ZL1 has directonal curved vanes and thicker face plates so can take more heat. Also, has no holes between hat and rotor so cooling duct air all goes into vanes. Curved vanes creat more surface area to dissipate heat and use better air flow inside to cool better. Post pillar is not straight vane, cts V co cast is post pillar, probably worst option for air flow and results in smallest surface area.....but lightest mass wise. 2014 vette z51s had co cast rotors and came with little rings you pit on track to close out holes so rotor cools better. Google it.
That's great information and thanks for sharing. I too am not argumentative and agree with most everything you've given us. I'm very familiar with mechanical engineering and how things are designed and the intended purpose of design features. The only reason I know that two piece rotors can work well, is if each piece, the hat and rotor are zero balanced separately then they can be interchanged indefinitely. To ensure proper mating of the two pieces la shouldered bolt with minimal clearance in the holes are used, the pieces will mate with very good tolerance and will retain its balance. I'm not saying that they need to do it, like you've said, the rotors GM and Brembo offer us are very good.
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Old 07-10-2015, 11:42 PM   #579
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Quote:
Originally Posted by olblue75 View Post
Found these numbers www.Iamgmparts.com seems like I could build a nice setup using them for about 1300 bucks all I would need extra is the pin kit and pads.

Caddy Parts MSRP There Price
4 20982719 CALIPER, LEFT COUPE, CTS-V, YELLOW $641.06 $330.15
4 20982734 CALIPER, RIGHT COUPE, CTS-V, YELLOW $641.06 $330.

Chevy Parts
1 20795300 ROTOR, LEFT 6.2 LITER, W/SUPERCHARGER $574.00 $295.61
1 20795302 ROTOR, RIGHT 6.2 LITER, W/SUPERCHARGER $574.00 $295.61

Not so much on ZL1 Calipers though!!!
6 20944529 CALIPER, LEFT 6.2 LITER, W/SUPERCHARGER $1,754.76 $903.70
6 20944530 CALIPER, RIGHT 6.2 LITER, W/SUPERCHARGER $1,754.76 $903.70

I will do you one better (cheaper)

http://www.camaro5.com/forums/showthread.php?t=348133

Matt
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Old 10-23-2015, 08:04 PM   #580
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I have seen a lot of brake duct setups. Many rob air from the main grille area that is desperately needed to cool the engine. We have taken a very aggressive approach for a couple of clients. The ducts are fabricated from aluminum, designed to feed massive amounts of air to the brakes.







Up next.

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Old 11-03-2015, 06:00 PM   #581
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...Up next.

hootie-hooot!
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Old 02-13-2016, 10:39 AM   #582
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The write up w| Photoos NEEDS to be UpDated ASAP!
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