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Old 11-29-2012, 06:40 PM   #61
miker
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One rotor has too much runout; going to have to have it cut.
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Old 11-30-2012, 08:23 AM   #62
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Quote:
Originally Posted by itsme4g63...View Post
Most aftermarket brake caliper adapter brackets are made out of aluminum!

And they're also made by companies spending millions in R&D and FEA work to make sure that aluminum doesn't fatigue over its lifetime and leave you planted firmly into whatever immovable object happens to be around.

Quote:
Originally Posted by miker...View Post
One rotor has too much runout; going to have to have it cut.

That's shitty.

Quote:
Originally Posted by canttouchthis...View Post
Yes your right its the Insignia. The calipers and rotors are huge and the GS is very heavy. I was just thinking that maybe it would be a direct fit. Bolt right up to the mount using no adapters.

Our Holdens use a bolt spacing unique to this chassis. It is shared with no other GM big-brake car, and very unlikely the Buick since that chassis was designed by Opel and not Holden.

Quick look online says replacement calipers are going for $700/side. Buying the calipers alone puts you in StopTech BBK territory.
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Last edited by Quiksilver; 11-30-2012 at 08:29 AM.
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Old 11-30-2012, 09:54 AM   #63
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Some other considerations

I've got a few HPDE's on my CTS-v (fronts only w/ 645 rotors and EBC Blues) setup. Here are a few thoughts...

The pedal is waaay higher and really jacks w/ any heel-toe. If you have stock pedals, you know how challenging it is already...

I'm running BFG R1's and when warm are just enough tire for this combo. Street tires made for interesting brake zones.

I know everyone has an opinion on pads, but I really like this setup w/ the Blues. Don't be afraid to go that route.

Thanks to everyone here for experimenting and posting. I love tracking my Aussy Tank!



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Old 11-30-2012, 11:28 AM   #64
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Corey, who's brake duct shields are you using for cooling? Custom?
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Old 11-30-2012, 02:11 PM   #65
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Quote:
Originally Posted by Quiksilver...View Post
Corey, who's brake duct shields are you using for cooling? Custom?

I'm not sure, let me look. I think I have an extra set, too...? The kit comes with both shields, the hose and assorted bits.

http://www.lapponline.com/index.php?...78c4c536d61b5e

Last edited by rucorey10; 11-30-2012 at 02:18 PM. Reason: Error
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Old 11-30-2012, 02:48 PM   #66
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Brand new stoptech rotor had .070 runout. Had to turn it as I'm racing tomorrow.

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Old 11-30-2012, 02:54 PM   #67
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Quote:
Originally Posted by Quiksilver...View Post

Our Holdens use a bolt spacing unique to this chassis. It is shared with no other GM big-brake car, and very unlikely the Buick since that chassis was designed by Opel and not Holden.

Thats not true. The Cadillac Catera Uses the same mount configuration. I sold a set of GTO calipers to a guy that had a Catera. That is an upgrade for them since they use a one piston caliper.

http://www.cadillacforums.com/forums...-swap-log.html
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Old 11-30-2012, 03:00 PM   #68
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Quote:
Originally Posted by canttouchthis...View Post
Thats not true. The Cadillac Catera Uses the same mount configuration. I sold a set of GTO calipers to a guy that had a Catera. That is an upgrade for them since they use a one piston caliper.

http://www.cadillacforums.com/forums...-swap-log.html

Cadillac Catera is the same chassis is us....
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Old 11-30-2012, 07:28 PM   #69
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h,,
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Old 11-30-2012, 07:45 PM   #70
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Corey, can you post more details on your universal fender flares. Pics would be nice too.
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Old 11-30-2012, 07:53 PM   #71
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Procut...the only way to cut a rotor
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Old 11-30-2012, 07:59 PM   #72
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Quote:
Originally Posted by choicesmade24...View Post
Procut...the only way to cut a rotor

Local Firestone has all the cool toys.
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Old 11-30-2012, 08:01 PM   #73
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That is a $9k to $10k brake lathe and is the only way you can ensure zero runout. It even takes into account hub assembly wear.
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Old 11-30-2012, 08:16 PM   #74
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Dang maing, that suxxorz. New rotors have wobbly runout. DBA "swears" non of their rotors require turning before installation.

Looking forward to seeing the "ultimate cts-v setup." Man, I need to go to Heintz . . . maybe I'll get a tune as a xmas present, haha.
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Old 11-30-2012, 08:49 PM   #75
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Quote:
Originally Posted by paulsz28...View Post
Dang maing, that suxxorz. New rotors have wobbly runout. DBA "swears" non of their rotors require turning before installation.

Looking forward to seeing the "ultimate cts-v setup." Man, I need to go to Heintz . . . maybe I'll get a tune as a xmas present, haha.

I love DBA but they didn't make a BMW 745i rotor.
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Old 11-30-2012, 08:57 PM   #76
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Going to get a BMW rotor retaining screw and drill/tap my hubs.
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Old 11-30-2012, 08:59 PM   #77
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NE Columbia here, where are you racing

I have an 06 and want to get it on the track. Where are you racing around here? Thanks
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Old 12-01-2012, 06:43 AM   #78
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Quote:
Originally Posted by Quiksilver...View Post
And they're also made by companies spending millions in R&D and FEA work to make sure that aluminum doesn't fatigue over its lifetime and leave you planted firmly into whatever immovable object happens to be around.

Yes and thanks to them, and others, its proven that the t6511-6061 is a durable metal of choice. U are correct sir.
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Old 12-01-2012, 08:46 AM   #79
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Quote:
Originally Posted by Oh4GTO...View Post
Corey, can you post more details on your universal fender flares. Pics would be nice too.

Sure, I'll post in a new thread.
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Old 12-01-2012, 02:02 PM   #80
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I drove Mikers car a cople of days ago and basically 50 percent locks the front tires up.
And he's got 265s up front with a 180 tread wear.
The brake pedal feels better as well.
I will probably do something like this and send the calipers to a machine shop since the grinding is extensive.
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Old 12-01-2012, 06:47 PM   #81
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Quote:
Originally Posted by Pmelton251...View Post
I have an 06 and want to get it on the track. Where are you racing around here? Thanks

I'm the timing chief for SCR Region SCCA. We do AutoXs all around the Columbia area. The nearest real track is Carolina Motorsports Park north of Columbia; we normally do one time trial/pdx/club trial a year there.

Dec 8th is the Subaru Showdown; they have a $130 PDX including instructor for a ton of a seat time on a track.
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Old 12-01-2012, 06:48 PM   #82
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They were great at the AutoX.

Tons better then stock.
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Old 12-01-2012, 07:28 PM   #83
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Old 12-01-2012, 08:10 PM   #84
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So what you are saying is the 6 pot CTSV and the VW rotors are a waste of time and are overkilll on the GTO. It sounds like the 4 pot CTSV's are more than enough? Is thst correct? Anything more would be purely cosmetic?
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Old 12-01-2012, 08:22 PM   #85
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Quote:
Originally Posted by choicesmade24...View Post
So what you are saying is the 6 pot CTSV and the VW rotors are a waste of time and are overkilll on the GTO. It sounds like the 4 pot CTSV's are more than enough? Is thst correct? Anything more would be purely cosmetic?

brake fade is the enemy, not initial bite. He hasn't done a fade comparison yet. There's rarely a point where it becomes cosmetic with heavy cars like us. It really depends how hard you will use them (and how intensely). Multiple laps around a track with long straight aways before heavy braking zones will certainly make this setup fade a bit, but not too badly. The CTS-V 4pot will experience this fading sooner and it will last longer, but is still a beefy setup that will likely never experience fade on the street or even most canyons and windy roads. All depends what you need (and what tires you're running)

edit: CTS-V v2 calipers are also 30/34/38mm pistons, instead of the 34/36/38mm sizes of the 17Z brembo or 40/44mm of the CTS-V1.
Pi*(Piston size)˛:
30 707mm˛
34 907mm˛
36 1017mm˛
38 1134mm˛
40 1256mm˛
44 1520mm˛

CTS-V1 = 2776mm˛
17Z Brembo = 2748mm˛
18Z Brembo = 3058mm˛
CTS-V2 = 3058mm˛
Thats a pretty sizeable piston area change. I would think that would yield a less sensitive pedal, no? Less piston travel per given fluid displacement? Or does the increased pressure per given fluid displacement make it a MORE sensitive pedal? I would think the increased pressure just makes the brake pedal move with less resistance, but would require more pedal travel for the same stop?

Last edited by HunterKiller89; 12-01-2012 at 09:05 PM.
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Old 12-01-2012, 08:28 PM   #86
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Quote:
Originally Posted by HunterKiller89...View Post
brake fade is the enemy, not initial bite. He hasn't done a fade comparison yet.

Using the same rotor I doubt the 6pots would resist fade more.

CMP Time Trial next weekend so I'll test the heat capacity.

I would go as far as to say the CTS-V brakes would be dangerous on the street if you didn't have wide race tires.

On 180treadwear 265s on the front I have way more brake bite then I could ever put to the ground.

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Old 12-02-2012, 12:47 PM   #87
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Rotor is still the biggest heat sink. That's where you'll see fade resistance improvements, increasing rotor size.
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Old 12-02-2012, 01:28 PM   #88
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Your experience, Miker, is different from mine. I believe it is the pad selection since everything else is the same. I'm running a strictly street pad and the pedal feel and feedback is vastly different from yours. I think I'm running Pagid pads. For some reason I can't remember.
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Old 12-02-2012, 01:29 PM   #89
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larger rotor will make it harder to heat soak the rotor. Larger caliper (or more clamping force rather) will make the effects of a heat soaked rotor less apparent, effectively hiding fade. They both play a role, but yes, the rotor is the only part that dissipates heat on a significant level.

Anyway, my point was if 50% pedal will lock the tires when cold, a hot/faded setup that hasn't had time to cool will still be able to lock the tires after aggressive use, albeit maybe with 80% pedal. Pad material has a big impact here too.
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Old 12-02-2012, 02:05 PM   #90
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Quote:
Originally Posted by Oh4GTO...View Post
Your experience, Miker, is different from mine. I believe it is the pad selection since everything else is the same. I'm running a strictly street pad and the pedal feel and feedback is vastly different from yours. I think I'm running Pagid pads. For some reason I can't remember.

Post up your experience.
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