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Re: Optimizing 11.75 disk questions [Re: Rapom65] #1488959
08/28/13 10:32 AM
08/28/13 10:32 AM
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Pikes Peak Country
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TC@HP2 Offline
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Pikes Peak Country
If they are inbound, then you might as well play with them. IMO, I don't think you will notice a a difference with them. In street driving, none, in autocross, none, in heavy rood course lapping, maybe if you're out for 15-20 minutes at a time, but ther may be other ways to achieve those results.

Back in my oval track days, we would put 50 hard, short track laps on the brakes using the stock, single pot, factory piston design. By the end of that run, the pedal was getting soft but we never boiled the fluid. I did run Red Devil fluid with the highest boiling point I could afford. I knew of another guy running a thin stainless steel shim between the pad and caliper. However, everybody's braking power was declining at a similar rate, so success in the pack was more dependant upon a driver's ability to adapt to the reduced braking capability than having a much improved system.

Re: Optimizing 11.75 disk questions [Re: TC@HP2] #1488960
08/28/13 02:53 PM
08/28/13 02:53 PM
Joined: Aug 2013
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Battle Ground, Washington
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Rapom65 Offline OP
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Battle Ground, Washington
So I take it from the last two posts that phenolic pistons are not the hot ticket for fast road courses. In my case I'm going to be handling limited by my tire/wheel package until I can finish building the car and save up for bigger rims and better tires. Then I will be brake limited. The track I will be running at is fast(Portland,OR)and have been told that any car with adequate power will need big brakes there. However, being a newb at this form of racing, it's probably a good thing to be somewhat limited until I learn the ropes.

Re: Optimizing 11.75 disk questions [Re: Rapom65] #1488961
08/28/13 04:21 PM
08/28/13 04:21 PM
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Warren, MI
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being limited is good, but your limiting on the wrong end. brakes is not something i'd limit, cut back on the hp so your not going that fast into a corner.


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Re: Optimizing 11.75 disk questions [Re: Rapom65] #1488962
08/28/13 04:21 PM
08/28/13 04:21 PM
Joined: Dec 2003
Posts: 22,696
Bitopia
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jcc Offline
If you can't dazzle em with diamonds..
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Bitopia
Actually a limited tire might be harder on the brakes in some cases, as you need to brake longer to get your speed down for your cornering limits, guess that also depends on how much available hp you got.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Optimizing 11.75 disk questions [Re: Jerry] #1488963
08/28/13 10:44 PM
08/28/13 10:44 PM
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Bitopia
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jcc Offline
If you can't dazzle em with diamonds..
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Bitopia
Quote:

being limited is good, but your limiting on the wrong end. brakes is not something i'd limit, cut back on the hp so your not going that fast into a corner.




interesting, 2 members saying almost the exact same thing, at the exact same time, differently.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Optimizing 11.75 disk questions [Re: Jerry] #1488964
08/28/13 11:45 PM
08/28/13 11:45 PM
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Battle Ground, Washington
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Rapom65 Offline OP
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What I really am is $ limited. Motor has been built and hanging on a stand for a couple of years while I pecked away at modifying the suspension and chassis. Stuck with 15 inch wheels and tires as I finish the rest of the car. 17 or bigger wheel/tire package is way off in the future, if ever as it looks like the job prospect might have evaporated tonight.

Re: Optimizing 11.75 disk questions [Re: Rapom65] #1488965
08/29/13 12:21 AM
08/29/13 12:21 AM
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Nebraska
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The green brick is a shining example of what 11.75 brakes can take. Weight is probably the biggest factor of all.


Mopar to the bone!!!
Re: Optimizing 11.75 disk questions [Re: 72Swinger] #1488966
08/29/13 01:21 AM
08/29/13 01:21 AM
Joined: Aug 2013
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Battle Ground, Washington
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Rapom65 Offline OP
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Yeh, the Brick is quite a machine. I'm trying to emulate it as much as possible. Not looking to build a super car just a nice low/mid budget handler for fun.

Re: Optimizing 11.75 disk questions [Re: Rapom65] #1488967
08/29/13 10:59 AM
08/29/13 10:59 AM
Joined: Dec 2003
Posts: 22,696
Bitopia
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jcc Offline
If you can't dazzle em with diamonds..
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Bitopia
Quote:

What I really am is $ limited. Motor has been built and hanging on a stand for a couple of years while I pecked away at modifying the suspension and chassis. Stuck with 15 inch wheels and tires as I finish the rest of the car. 17 or bigger wheel/tire package is way off in the future, if ever as it looks like the job prospect might have evaporated tonight.




Regardless of the money, if you can afford to get the track, as Mitch and others have mentioned numerous times, the driver outweighs nearly every performance part on the car, and the best thing is he can improve immensely, where the rest of the car can only improve slightly from track time. Just lower your immediate goals enough to start getting seat time, the rest will come later, you can even learn a lot with a slant six. Re watch the Bunch video, even with the big hemi, etc, the little cars could hang with him in the corners.



Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Optimizing 11.75 disk questions [Re: Rapom65] #1488968
08/29/13 10:59 AM
08/29/13 10:59 AM
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USA
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Consulier Offline
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This is probably the latest version of something effectively using 11.75 rotors with the simple Viper Caliper conversion.

Most of the stuff had 6 piston kits. Pad compound makes a huge difference.

Popular Hot Rodding Magazine Muscle Car of the Year Speed-Stop Challenge Results

Travis Hartwell – 1977 Trans Am #1
8.985

Larry Woo – 1968 Camaro #13
9.21367

Danny Popp – 1972 Corvette #2
9.25533

Kevin Wesley – 1970 Plymouth #3
9.36367

Mark Pecikonis – 1968 Camaro #4
9.364

Deb McGilton – 1968 Camaro #12
9.42633

Damon Campbell – 1963 Pontiac Tempest #11
9.51967

Jeff Schwartz – 1981 Trans Am #7
9.53233

Al Noe – 1967 Camaro #9
9.80533

Craig Johnson – 1969 Camaro #5
9.87867

Eric Wracker – 1971 Duster #8
9.88533

Dan Ballard – 1972 Nova #6
9.91633

Paul Van Nus – 1967 Nova II #14
10.2117

Herb Stuart – 1968 Mercury Cougar #10

Re: Optimizing 11.75 disk questions [Re: fury413rb] #1488969
08/29/13 11:03 AM
08/29/13 11:03 AM
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Posts: 10,645
Houston, Tx
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Houston, Tx
Quote:

I work for Hawk. We make a pad for the 73 caliper.




Do you have any part numbers for this?


My Build thread: Let the hemi swap begin!

1968 wanna be pro touring whatchamacallit with some fancy stuff and a new roof skin.
Re: Optimizing 11.75 disk questions [Re: AlexP] #1488970
08/29/13 12:07 PM
08/29/13 12:07 PM
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Posts: 3,456
Fly Over States
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PHJ426 Offline
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Kevin,

Is that a B body or C body 11.75" disc, slotted and dimpled from which vendor?

What pads are you running on the front doing that kind of stopping? What size M/C, rear brakes?

Thanks.

Re: Optimizing 11.75 disk questions [Re: PHJ426] #1488971
08/29/13 12:16 PM
08/29/13 12:16 PM
Joined: Sep 2007
Posts: 14,889
up yours
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Geez Kevin,

You are probably one of the top drivers I know, so it might be a case of the driver being better than the brakes here.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Optimizing 11.75 disk questions [Re: PHJ426] #1488972
08/29/13 12:19 PM
08/29/13 12:19 PM
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Posts: 256
USA
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Consulier Offline
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USA
Quote:

Kevin,

Is that a B body or C body 11.75" disc, slotted and dimpled from which vendor?

What pads are you running on the front doing that kind of stopping? What size M/C, rear brakes?




B body disc, no slots or dimples. These are actually the one's Eberg used to sell, so not sure who made them. Just get an American made rotor from the parts store and you'll be fine.

I run Hawk HT-10's in front, the Eberg 1" (I think) master and Dr. Diff Cobra conversion in the rear with Hawk Blue pads.

If you don't like brake dust, don't use my pad specs. If you don't like to warm the brakes first before using them at an event, don't use my pad specs. I will say that I have well over 100 autocross runs and a couple track day on the pads and they have at least 50% life left in them.

Re: Optimizing 11.75 disk questions [Re: Supercuda] #1488973
08/29/13 12:20 PM
08/29/13 12:20 PM
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USA
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Consulier Offline
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Quote:

Geez Kevin,

You are probably one of the top drivers I know, so it might be a case of the driver being better than the brakes here.




Just did a 2 day tire test at Tire Rack and we used their test driver. Same results, he loved the brakes.

Re: Optimizing 11.75 disk questions [Re: Consulier] #1488974
08/29/13 12:26 PM
08/29/13 12:26 PM
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USA
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USA
Just finished a tire test for Hot Rod and Tire Rack. 7 different tires tested in 275/35/18 over 2 days making over 70 autocross laps. This will be the test to watch for 200 treadwear tires.

Re: Optimizing 11.75 disk questions [Re: Consulier] #1488975
08/29/13 12:44 PM
08/29/13 12:44 PM
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Posts: 4,302
Nebraska
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Nebraska
Huh I bet the ones you're bolting on in the bottom photo won. I love to see that 4 door killin those PT guys. That seriously warms my heart and if I could I would give you a big hug, or maybe just settle for a high five lol, no homo, anyway, way to fricken go mang!


Mopar to the bone!!!
Re: Optimizing 11.75 disk questions [Re: Consulier] #1488976
08/29/13 12:57 PM
08/29/13 12:57 PM
Joined: Jan 2003
Posts: 31,052
Oregon
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AndyF Offline
I Win
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I Win
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Posts: 31,052
Oregon
The Viper on 11.75 front system works pretty well when coupled with DoctorDiff's rear disc brake setup. The brake bias should be fairly decent for a B-body car also.

One thing that would've made that kit even better is if I'd had gone ahead and tooled up a 1.25 thick version of the 11.75 rotor. Then there would've been more rotor mass and we could've eliminated the pad spacers. But there wasn't enough money in the tooling budget to do that.

Cass has developed some additional options over the past few years. He was even exploring the possibility of a low cost "Viper" clone caliper which would be much less expensive.

Re: Optimizing 11.75 disk questions [Re: 72Swinger] #1488977
08/29/13 02:51 PM
08/29/13 02:51 PM
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USA
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Quote:

Huh I bet the ones you're bolting on in the bottom photo won.




Nope... there is going to be some upsetting of the apple cart very soon.

Can't release any results yet, but I can say that with the winning tire the Satellite averaged over 1.2 g's.

Re: Optimizing 11.75 disk questions [Re: Consulier] #1488978
08/29/13 02:58 PM
08/29/13 02:58 PM
Joined: Jan 2003
Posts: 28,068
Irving, TX
feets Offline
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Irving, TX
Quote:

Quote:

Huh I bet the ones you're bolting on in the bottom photo won.




Nope... there is going to be some upsetting of the apple cart very soon.

Can't release any results yet, but I can say that with the winning tire the Satellite averaged over 1.2 g's.










With shoes like that the Imperial might get enough bite to drag the door handles on a curb. It won't touch 1.2 g but might be able to hit .12 g.



We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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