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Discussion Starter · #1 · (Edited)
ok I do way to much thinking, so here is my Idea for a big rotor kit.

this isn't an offer to develope these. just an Idea thread

ok here is what i'm thinking. if i get the 12" rotors from Justin's brembo kit and get the rotors that pat is using for his rear kit I could have 12" fronts and 11.4" rears using stock calipers all around. just need adapters or dogbones. so $210 rotors front, $50-60 for the rears, and either custom up some steel adapters or dogbones. steel lines would be an option. hmmmm this is more likely for me than the more expensive kits. id still need a spare that would fit :p

this of course would be mostly cosmetic, but should get some better braking. and the rotor diameter difference front to rear isnt that much different than stock so brake bias should still be good......

I'm thinking this could be done for $400 front and $250 rear if I had the caliper dogbones made. $300 front $150 rear or less if I did it myself. plus shipping. pads and stainless lines optional.
Justin's kit
http://g20.net/forum/showthread.php?t=48765

Pat's Kit
http://www.g20.net/forum/showthread.php?t=50651
 

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Boosted & Stanced
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braking will not improve at all if not actually get worst as there will be more rotational mass with no increase in clamping area. You will not surpass stock rotor efficiency for daily driving, better to upgrade brake pads if anything. A lot of the stopping power is in the calipers and brake pads. The setup you listed might work well for tracking or such as that may require more heat dissipation.
 

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Discussion Starter · #3 · (Edited)
but you will have more braking leverage from the increased diameter. so i dont see how it could be worse even with the mass increase.

edit: like i said mostly cosmetic. not really for the better braking but I would still think that this setup would improve not degrade braking. the increase in mass isnt anywhere near what most folks are seeing with their over sized wheels and tires already, and the increased diameter leverage has to add to the braking ability
 

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Racing brake in New Jersey makes a whole bracket to relocate the caliper. They also supply you with the rotor for $500. http://www.racingbrake.com/MAXIMA_FRONT_00_03_p/2048-141-0.htm You have to redrill the rotor for 4 lug tho. Other possible front upgrades are the 13" Cobra rotor upgrade I did with Q45 calipers. And lastly I did the 04 Maxima brake upgrade for my cousin using a huge single piston caliper and 12.4 inch rotors. The rotors are thick as hell and way better then the puny stock. Also, they improved braking hands down. Both my options were in the $250-$350 zone and has been replicated by other G20 members.
 

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Discussion Starter · #6 ·
Interesting, that maxima kit work with the P11 Caliper??

One additional benefit of doing the setup i described above is that in the winter you could pull the dogbones out, slap on your stock rotors and run winter wheels, and the rotors are all already 4 lug x 114
 

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Maxima calipers are essentially P11 calipers...they are interchangeable. The only problem with the kits that I listed are weight, you can go with a two peice rotor which adds to the aesthetics but its costly. Also, you will need 17" rims for all these setups. Look at Febuary's MOM and look at my cousins brakes, they fill out the rim nicely and work really well.
 

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SgtDGun said:
anyone waant to do the brake force math for this setup?
take the outer radius and subtract half the height of the pad, the change in braking power is the ratio of the two lever arms:

eg 258 disk, = 129mm radius, take a guess as a pad height of 28 mm?
then subtract 14mm, gives 115mm lever arm

then the 280mm euro/uk GT front disks, 140 mm radius, subtract 14mm, = 125mm

the increase in brake power is 125/115 =8.7% extra power or 8.7 % less pedal pressure required to lockup the brakes. The increased area is roughly the square of that ratio, so the max speed for a one time brake to 0 & fade goes up by about 8.7% as well...

Mike
 

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Discussion Starter · #12 · (Edited)
Uk-SRi said:
take the outer radius and subtract half the height of the pad, the change in braking power is the ratio of the two lever arms:

eg 258 disk, = 129mm radius, take a guess as a pad height of 28 mm?
then subtract 14mm, gives 115mm lever arm

then the 280mm euro/uk GT front disks, 140 mm radius, subtract 14mm, = 125mm

the increase in brake power is 125/115 =8.7% extra power or 8.7 % less pedal pressure required to lockup the brakes. The increased area is roughly the square of that ratio, so the max speed for a one time brake to 0 & fade goes up by about 8.7% as well...

Mike
ok then using this formula I would get

280mm 140-14=125
305mm 152-14=138
138/125= 10.4%
 

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Discussion Starter · #15 · (Edited)
hmm so using the same basis for comparison the rears should be

258mm 129-14=115
290mm 145-14=131
131/115= 1.139/1
=13.9%

Stock front brake torque = 1535801.696 + 10.4% = 1695525.072

Stock rear brake torque = 503984.0592 + 13.9% = 574037.843

Stock Front brake bias = 1535801.696 / (1535801.696 + 503984.0592 ) = 75.2%
Stock Rear brake bias = 24.8%
2269562.915
New Front brake bias = 1695525.072 / (1695525.072 + 574037.843 ) = 74.7%
New Rear brake bias = 25.3%

well this makes sense to me, got the numbers from the great brake thread.
http://www.g20.net/forum/showthread.php?t=43075&highlight=great+brake+thread
 

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So youre saying there is 15 mm clearance between the front stock caliper and rotor? Im not following how youre going to install a larger rotor with the stock caliper. Im guessing the expense of making custom dogbones for that is going to be as much or more than just buying the brembo calipers. It's the pads where the bend you over, though.


- Greg -
 

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Discussion Starter · #17 ·
MrFancypants said:
So youre saying there is 15 mm clearance between the front stock caliper and rotor? Im not following how youre going to install a larger rotor with the stock caliper. Im guessing the expense of making custom dogbones for that is going to be as much or more than just buying the brembo calipers. It's the pads where the bend you over, though.


- Greg -
Whoa gonna need pictures to understand what your saying here. I have a adapter design in mind to raise the caliper to the right height.

added more info in previous post ^^^
 

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subscribed. i gotta figure out the math for stock P11 brakes to BABK.
 

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Discussion Starter · #20 · (Edited)
edit: this is directed towards my formulae
well im not sure how correct that is. it also doesnt take into account increased rotating mass etc. alot of variables. but i feel comfortable saying that there will be an increase in braking ability that might make up for my 17 inch wheels and larger rotor mass
 
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