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Re: 13" brake kit install with pictures


Blown1
Unregistered


Galant VR-4 org Post #: 470928 posted 04/28/07 08:56 AM     Remind Me!  Send Private Message   Edit Post      
Luke its not so much that slotted or cross drilled rotors are bad
its the actual design. If the rotors are cast(made) with these options
they are just as strong as any normal rotor. Its when they drill out the holes
after the rotors are made that you can encounter cracking etc. Just look at any
race car they all have some kind of slotted or cross drilled rotor and they do not
fall apart.

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steve Galant VR4.org Administrator
Assmilk Pearl


Galant VR-4 org Post #: 474104 posted 05/04/07 10:45 AM     Remind Me!  Send Private Message   Edit Post      
The elusive "cast slotted/drilled rotors" theory again. I think they are all drilled, never cast with the holes already in them.



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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Rausch Galant VR4.org Moderator
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Galant VR-4 org Post #: 474272 posted 05/04/07 03:18 PM     Remind Me!  Send Private Message   Edit Post      
Steve is correct...from what i have read, and even in school, all the "drilled" rotors were just that, drilled. i have never come across any info stating that any rotors (including the high $$ carbon jobs) were cast with holes.



Rance lives here...
Founder of Sold out to BMW Cru, then sold out there too.


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digit
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Galant VR-4 org Post #: 474541 posted 05/05/07 06:11 AM     Remind Me!  Send Private Message   Edit Post      
Why are they called cross DRILLED rotors if they are cast with the holes in them?

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656of1000
You can't put a price on childhood memories
656/
1000


Galant VR-4 org Post #: 474721 posted 05/05/07 06:33 PM     Remind Me!  Send Private Message   Edit Post      
A few questions...
1) What are the rotor thicknesses from the Cobra compared to the Camro or Vette (whichever car the calipers are from) rotors? If the Cobra rotors are thinner, I'd be concerned that when the pads wear low, the possibility may exist that the pistons will extend too far. It probably wont, but I know that rotors have specific discard specs per application. Is this something that was considered, or is this even relavent?

2) Do the pads sufficiently cover the with of the rotor surface? I.e. will the rotors have a large lip as they wear, or do the pads hang off the edge of the rotor?

3) Where are the hub spacers available, or were they made along with the caliper brackets?

I'm not trying to be devil's advocate, or a PITA, but rather trying to encourage discussion to further develop this setup as an extremely viable, cheap upgrade.



Mark I.

1992 Galant VR4 656/1000
2004 Mazda RX-8
1988 Escort GT Turbo
1987 Ranger STX
2002 Subaru Impreza Outback Sport

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Luke
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201/2000


Galant VR-4 org Post #: 474998 posted 05/06/07 04:30 PM     Remind Me!  Send Private Message   Edit Post      
For completeness, here is the change of front-to-rear brake bias with this brake upgrade.
( Note: A positive number means that brake bias is shifted towards front )

  • stock caliper + 10.9" rotor +0%
  • 3kgt caliper + 12.35" rotor +16%
  • camaro caliper + 13" mustang cobra rotor +44%
  • corvette caliper + 13" mustang cobra rotor +2.7%

    The above numbers are obtained by multiplying the piston area increase and the rotor "effective diameter" increase.

    Brake piston diameters are as follow:

  • stock front calipers : 2 X 40.4 mm
  • corvette C5 calipers : 2 X 38 mm
  • camaro/firebird calipers : 2 X 45 mm
  • 3000GT calipers : 40.4 mm and 42.8 mm

  • Posts: 752 | From: San Jose, CA | Member Since: 07/16/02 | IP: (75.35.217.22) | Report this post to a Moderator

    Luke
    Senior Member
    201/2000


    Galant VR-4 org Post #: 477949 posted 05/12/07 08:10 PM     Remind Me!  Send Private Message   Edit Post      
    1) Mustang cobra rotor thickness is 1.1". Camaro and Corvette rotor thickness is 1.26". Unfortunately that means the pistons will extend 0.16" further than GM intended when the pad wears low. However, I have ran my setup before with a set of very worn brake pads for about 2 months, and didn't have problems.
    I think, to be safe, if someone can come up with some shims that are about 0.08" thick, this issue can be fixed. People use shims all the time for brake pads for anti-squeal/rattle purpose.

    2) I do not know about this.. only time will tell, I guess..

    3) I ordered the hub-rotor spacers at the same time from Ron.



    Quote:

    A few questions...
    1) What are the rotor thicknesses from the Cobra compared to the Camro or Vette (whichever car the calipers are from) rotors? If the Cobra rotors are thinner, I'd be concerned that when the pads wear low, the possibility may exist that the pistons will extend too far. It probably wont, but I know that rotors have specific discard specs per application. Is this something that was considered, or is this even relavent?

    2) Do the pads sufficiently cover the with of the rotor surface? I.e. will the rotors have a large lip as they wear, or do the pads hang off the edge of the rotor?

    3) Where are the hub spacers available, or were they made along with the caliper brackets?

    I'm not trying to be devil's advocate, or a PITA, but rather trying to encourage discussion to further develop this setup as an extremely viable, cheap upgrade.





    2.3L 6-bolt, BJ's ported 2G head, TRE tranny, GT3076R, 255lph, 850cc, AFPR, ROM emulator, Aquamist, ETS FMIC, LSD rr Quaife ft diff, WL swaybars, Bilstein, HKS 264/272 cams, ZT2 WBO2

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    digit
    Unregistered


    Galant VR-4 org Post #: 479746 posted 05/16/07 11:50 AM     Remind Me!  Send Private Message   Edit Post      
    How much do you guys end up spending total after the brackets, calipers, rotors, spacers, etc?

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    ron
    Unregistered


    Galant VR-4 org Post #: 482684 posted 05/22/07 11:29 AM     Remind Me!  Send Private Message   Edit Post      
    1)The rotors are .10 thinner but you should not have to worry about the pistons extending too far.
    The discard specs are more for how many time you could resurface the rotors.

    2)The pad do cover pretty much the whole width of the rotor and 100% of the pad grab the rotor.

    3)I've included the hub spacers for the last 10 sets that were shipped.






    Quote:

    A few questions...
    1) What are the rotor thicknesses from the Cobra compared to the Camro or Vette (whichever car the calipers are from) rotors? If the Cobra rotors are thinner, I'd be concerned that when the pads wear low, the possibility may exist that the pistons will extend too far. It probably wont, but I know that rotors have specific discard specs per application. Is this something that was considered, or is this even relavent?

    2) Do the pads sufficiently cover the with of the rotor surface? I.e. will the rotors have a large lip as they wear, or do the pads hang off the edge of the rotor?

    3) Where are the hub spacers available, or were they made along with the caliper brackets?

    I'm not trying to be devil's advocate, or a PITA, but rather trying to encourage discussion to further develop this setup as an extremely viable, cheap upgrade.



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    ron
    Unregistered


    Galant VR-4 org Post #: 484452 posted 05/26/07 12:35 AM     Remind Me!  Send Private Message   Edit Post      
    Quote:

    --------------------------------------------------------------------------------

    How much do you guys end up spending total after the brackets, calipers, rotors, spacers, etc?






    Total should be under $300.

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    Rausch Galant VR4.org Moderator
    Rock Star Status


    Galant VR-4 org Post #: 493377 posted 06/18/07 02:09 AM     Remind Me!  Send Private Message   Edit Post      
    since math and i don't sometimes get along, and i am unsure of the formula used, can someone do the math and figure out what percentage increase in bias would go to the rears with a set of stock fronts back there? my thought is that if the increase is similar to that of the camaro caliper, or somewhere close, we could then approximate what size rotor/caliper/pistons would be needed to balance the equasion for each of the choice brake upgrades.....anyone?



    Rance lives here...
    Founder of Sold out to BMW Cru, then sold out there too.


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    Luke
    Senior Member
    201/2000


    Galant VR-4 org Post #: 501076 posted 07/03/07 11:52 PM     Remind Me!  Send Private Message   Edit Post   
    Front : camaro caliper and mustang cobra rotor conversion.
    Rear : stock front caliper and rotor

    F/r brake bias change is -51%.
    I.e. the brake bias will significantly shifts towards the rear of the car.



    2.3L 6-bolt, BJ's ported 2G head, TRE tranny, GT3076R, 255lph, 850cc, AFPR, ROM emulator, Aquamist, ETS FMIC, LSD rr Quaife ft diff, WL swaybars, Bilstein, HKS 264/272 cams, ZT2 WBO2

    Posts: 752 | From: San Jose, CA | Member Since: 07/16/02 | IP: (75.35.115.144) | Report this post to a Moderator


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