|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: feets]
#1387066
02/15/13 02:03 PM
02/15/13 02:03 PM
|
Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1
OP
super stock
|
OP
super stock
Joined: May 2005
Posts: 723
Houston Tx
|
I did some playing around with a bathroom scale and the brake pedal in my truck one day. If I recall, 40-50 pound required very little effort, and 70-80 pounds of pressure was fairly easy. Effort was required around 120 pounds, and 150 pound was starting to lift me out of the seat. Kind of told me I'd prefer threshold braking to be below ~120 for road course work. A lower seat to brake pedal angle would have helped.
That being said, F1 drivers use approximately 190-200 pounds of force at threshold braking.
-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
|
|
|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: Uhcoog1]
#1387067
02/15/13 02:57 PM
02/15/13 02:57 PM
|
Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
I Live Here
|
I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
|
I learned that it's hard to go from stock brakes to big brakes...and then back to stock brakes. Once you've had the confidence of a BBK, all stock brakes seem scary. I had a 355mm Brembo GT1 caliper with a 2 piece rotor on on my GTI. They were amazing. It's the F40/F50/Aston/Viper etc 4 piston caliper.  Now for a 6 piston Cayenne Brembo on a 330mm rotor to fit under 17 inch wheels. Wade's got me convinced to get AndyF's Viper 4 piston (same caliper as my Brembos) for my 11.75's withn a really good pad.
|
|
|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: AlexP]
#1387068
02/15/13 03:42 PM
02/15/13 03:42 PM
|
Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
|
Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
|
I don't have any Cayenne calipers but I've got a 6 pot unit off a Maserati. Oh yeah, I've got a spare pair of 8 pot AMG calipers for the Imp. 
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
|
|
|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: feets]
#1387069
02/15/13 10:40 PM
02/15/13 10:40 PM
|
Joined: Mar 2012
Posts: 168
Washington State, USA
Winchester 73
member
|
member
Joined: Mar 2012
Posts: 168
Washington State, USA
|
Quote:
Do whatever you want on your car but I'm not going to live with a solid brake pedal.
Pressing 300 lbs on your brake pedal to stop the car at every red light and stop sign would get old VERY quickly. Think about it. How many one leg 300 lb presses can you do? Now, how many times do you hit the brakes on your way to work? No matter how He Man you think you are I bet the brake pedal would still win.
It would also be hard on the seat frame and floor.
Some people forget that we drive these cars for pleasure.
the numbers are confusing you i think.a leg press is different than pressing a brake peddle.stand on on foot and see ho many times you can lift your body ONE INCH.i am 210 lbs and can do it 20 times fast before it starts to get tiring and thats one rep after another.so if i lived in peru i could drive and not get leg fatige-no body stops that often or repeatedly.in traffic how much of the peddle do you think you need?you wouldent use the whole 300 lbs and on a roadcourse the 300 would likely not thru the whole braking.
f1 drivers use 190lbs?those guys are all the size of jockeys-cept for Dannica patrick -shes got a little meat on her bones.
|
|
|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: Winchester 73]
#1387070
02/16/13 02:52 AM
02/16/13 02:52 AM
|
Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
|
Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
|
Once again, you do what you want with your car.
I do not want a solid brake pedal.
Since you like the idea so much, why don't you run the numbers and tell us what kind of pedal arrangement and master cylinder it would take to get a 200 lb (since it doesn't have to be 300 lb) push on the pedal that generates no appreciable movement but still gives you 1000 psi at the calipers and between .003" and .008" of pad movement.
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
|
|
|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: feets]
#1387071
02/16/13 06:17 PM
02/16/13 06:17 PM
|
Joined: Mar 2012
Posts: 168
Washington State, USA
Winchester 73
member
|
member
Joined: Mar 2012
Posts: 168
Washington State, USA
|
Quote:
Once again, you do what you want with your car.
I do not want a solid brake pedal.
Since you like the idea so much, why don't you run the numbers and tell us what kind of pedal arrangement and master cylinder it would take to get a 200 lb (since it doesn't have to be 300 lb) push on the pedal that generates no appreciable movement but still gives you 1000 psi at the calipers and between .003" and .008" of pad movement.
ok ,im not great at math so ill have to start easy.if i use a caliper as a mas cyl so the the volume is the same or four pumping into four if you like,a two hundred pound press should net 200 psi with no peddle leverage built in(push right on the mas cyl)
so if the peddle is one 14 long with two inches above the mas cyl that would be a force and distance multiplication of 6x so
1200 psi caliper press
.018 to.014 pad movement
thats about the closest i could come to putting it on paper i have no idea what cal volumes are and dont feel like doing pie.from my micky mouse setup it doesnt seem like 1000 psi and 1 inch of peddle travel is unreasonable,the problem is nobody in fifty years has put 200 psi in a brake peddle and most peaple are acostomed to tickling the peddle with thier foot and having thier modern brakes stop thier car for them.modulation to threshold is the job of abs so they dont need a hard peddle feel for modulation.
i like a soft peddle,heated seats,stereo,carpet,brakes that are bigger than my tires can justify- just like the next guy.
im also willing to push all that junk into a dumpster to go a little bit faster.ill even bother to listen to peaple like you who act arrogant toward me in hopes i learn something.
remember in the 80s when "pro street" cars were all over the place and thats what evryone was building.peaple saw cars like the silver bullit-ran tens in 1970 and was a street car and were inspired for the next twenty years to build cars that LOOKED like it.
fast foreward twenty years later and RJ GOTTLIEBs camaro catches the attention of the world outrunning evrything italy germany and japan could thro at it by a huge margin and set the car world on fire and for the next twenty years "pro touring" has done its best job to produce cars with the same "feel,vibe,penache,LOOK,ect,ect."
alot of these cars (like yours)remind me of the parade ground twelve second cars driving around with blowers sticking thru the hood back in the 1980s 
|
|
|
Re: My Big Brakes - 14"x1.25" with viper calipers on all 4
[Re: feets]
#1387072
02/16/13 07:47 PM
02/16/13 07:47 PM
|
Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
OzHemi
Penguin-hating Ginger
|
Penguin-hating Ginger
Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
|
Quote:
I don't have any Cayenne calipers but I've got a 6 pot unit off a Maserati.
Oh yeah, I've got a spare pair of 8 pot AMG calipers for the Imp.
You are welcome. 
And my Torana combo works really well also (to me).... 8 piston Brembo front/360mm rotor, 4 piston Brembo rear/330mm rotor, and '00 Corvette master cylinder.
|
|
|
|
|
