sam430

iTrader: (10)

As many already know here that you can buy an LS400 caliper and bolt it up to your GS with little modification (adding RCA or FIG's RCA w/ LBJ upgrade ).

I did some research and pissed off a few people by asking them questions but we've come to collect some data and I want to propose an idea for everyone her to look at.

First off Rotor Data, You will find it interesting that the 2GS rotors are thicker than the LS rotors. Also, the weight is different too but I can't confirm it from shipping weight. Observe the data between our GS vs LS..., I've thrown in a third wheeler (supra):

Spec from r1concept.

LS400
Outer Diameter mm 315
Outer Diameter inches 12.40
Height mm 53.1
Height inches 2.091
Nominal Thickness mm 28.00
Nominal Thickness inches 1.102
Minimum Thickness mm (Discard) 26
Minimum Thickness inches 1.02
Hub Hole/Whl Reg mm 62.08
Hub Hole/Whl Reg inches 2.44
Number of Studs 5
Bolt Circle Diameter mm 114.3
Bolt Circle Diameter inches 4.50
Bolt/Hole Dia mm or Stud Size 14.5
Bolt/Hole Dia in or Stud Size
Weight (lbs) Including Box 23.00
Mounting Type Floater
Application TOY Position F
Per Car Quantity 2


2nd genGS
Outer Diameter mm 295.9
Outer Diameter inches 11.65
Height mm 50.8
Height inches 2.000
Nominal Thickness mm 32.00
Nominal Thickness inches 1.260
Minimum Thickness mm (Discard) 30
Minimum Thickness inches 1.18
Hub Hole/Whl Reg mm 62 Hub
Hole/Whl Reg inches 2.44
Number of Studs 5
Bolt Circle Diameter mm 114.3
Bolt Circle Diameter inches 4.50
Bolt/Hole Dia mm or Stud Size 14.5
Bolt/Hole Dia in or Stud Size
Weight (lbs) Including Box 9.00 Mounting Type Floater
Application TOY Position F
Per Car Quantity 2

Supra Turbo
Outer Diameter mm 323
Outer Diameter inches 12.72
Height mm 49
Height inches 1.929
Nominal Thickness mm 30.00
Nominal Thickness inches 1.181
Minimum Thickness mm (Discard) 28
Minimum Thickness inches 1.10
Hub Hole/Whl Reg mm 62.05
Hub Hole/Whl Reg inches 2.44
Number of Studs 5
Bolt Circle Diameter mm 114.3
Bolt Circle Diameter inches 4.50
Bolt/Hole Dia mm or Stud Size
14.5 Bolt/Hole Dia in or Stud Size
Weight (lbs) Including Box 21.00
Mounting Type Floater
Application TOY Position F
Per Car Quantity 2


What I would like to see happen is to find an upgrade to the LS rotors for maximum/minimum outer diameter. The optimal thickness. and the correct height of the rotor when adjusted for thickness. I will attempt to draw this on some cad software... it'll take a bit, I'm a noob in everything.

to be updated:

sam430

iTrader: (10)

My attempt at drawing in 3d failed. here's how it look, just for fun.

buttt

this is way easier.




sooo, all I want to do is to find a good size thickness but still also works with our caliper. Thanks to this pic, makes it much easier to ask question.

What I want is to increase "C" (is it better to increase thickness?)
Retain "B" or increase by 1 mm when increasing thickness.
Maximize "A" (need to know the smallest and largest we can go)


I noticed that the LS400 "C" is much smaller than the other rotors. Should I persue finding the rotor that is thicker?

The whole point of all this is to find alternative rotors that will work with our setup but also more reliable and give better performance.

sam430

iTrader: (10)

So, based on the LS400 info, I came up with a number scheme.

Upgrade:

Thickness = C+n where n is an even number. So our current C is 28mm and I want to go to 32mm, therefore n is 4.

Height = H + n -n/2 where H is 53.1 therefore we should go with 55.1 if we wanna do 32mm thickness.
Height = H +n/2 and it comes out to the same number.

Diameter = to be determined but safe at 315mm

Center bore= 62mm


We need to determine if there is any clearance issue with the height, if clearance is not there, we can do subtract 1 mm to height and add a 1mm spacer to the caliper (washer).

Since we've added thickness to the rotors, we want to minimize the diameter of the rotor without sacrificing too much of the integrity (warping or "wobbling" at the outer edge).

Curious to know if we can go with 61mm center bore.

sam430

iTrader: (10)

I guess I'll reserve a few more more spots.

sam430

iTrader: (10)

comments, suggestions, questions, criticism, speculation, theories, off topic, etc.....whatever is fine with me.. I've reserved enough spaces to update the first few pages with relevant information.

I just noticed that the hub hole is very very slightly different... odd, I'm wondering how r1 got their data.

sam430

iTrader: (10)

looking for input.

vwynn

iTrader: (4)

no clue whats going on besides you want to increase rotor diameter?
Problem about that is you will hit the caliper which im sure you understand.. Surface area contact from the brake pads stay the same..

Increasing A would be fine if you have enough clearance.. if not then it will not work..
Increasing C will increase B which might throw off the braking?? since 1 pair of pistons will be pushed out a tad bit farther then the other??

the only benefit i see is more mass which in return means the ability to hold more heat which = takes a lil longer to fade? the downside i see is more mass = takes more energy to rotate + more baking pressure to stop the rotation.. of course its so small u wont notice it lol...

i dont know what im talkin about since im no physics professor but thats my noobish input :]

just get TT brakes

sam430

iTrader: (10)

I want to increase thickness and maximize diameter (reduce diameter safely and without compromising the ability not to warp). Another member discussed cutting down the supra rotors to work with the lighter LS400 calipers (can't find it anymore).

Yeah, increasing B will increase C, so to compensate, decrease C by another half of B. So if I increase B by 4mm, that will increase C by 4mm... in order keep the rotor in center of the caliper, I have to decrease overall another 2mm (which is half of the 4 mm).

Upgrade to TT? I'd end up upgrading that rotor too this formula should work for all rotors... just need to refine it and double check.

vwynn

iTrader: (4)

http://www.tirerack.com/brakes/brake...ar=&perfCode=A

what if u get something like that???

sam430

iTrader: (10)

That is what I actually wanted... you can search by diameter and thickness on the manufacturer website. It'll be light and I believe they have one the size for the ls400, but I noticed the thickness is only 28mm so I wanted to increase the thickness

vwynn

iTrader: (4)

Rotors on v1agra.... hmmmmm

aloysius

so did you end up finding what you wanted ?

sam430

iTrader: (10)

nope.... I went with the brembo blanks.

sam430

iTrader: (10)

was looking around on figs old website and found out he sells two piece rotors.