cheddaboy

Not sure yet, gonna see if the tl rears require any modification to fit

cheddaboy

So hopefully when I get the calipers i will be rebuilding them with parts off this site..

http://store.zeckhausen.com/catalog/...4vdm6ill0bvlq1

AlvinHuyN

I was lucky enough to find a Rotora BBK for a great deal but I'm still interested to see how this turns out.

As far as I know th DC5 brembo fits but you gotta shave down 5mm off the mounting points to fit them on the stock rotors.

cheddaboy

Thought of that too but we discovered them caliper is actually weaker than the stock calipers. Found out that the diameter of the rear TL rotor is virtually the same as the S. Does that mean a bigger rotor can be used up front as well??

TL


S2K


Calipers arrived and I will be picking them up in a couple days

Keith P

I was told a long time ago to not use tl-s calipers on the s2k. The explanation was that the s2k caliper mounts behind the wheel and the tl-s mounts in front.

Is this true?

I have a pair of brembos from a tl-s that i milled 7mm from the mounting side. It's to fit my 08 si. Will these fit my s2k?

cheddaboy

Not entirely sure if there would be a negative effect by mounting them "behind" the wheel. Pretty sure that as long as the bleeder screw is facing up its ok. Dont take my word for it though as I could be wrong.

Heres a pic to descibe what Keith P means by in "front" and "behind":

Front(TL Caliper)

Behind(S2K)


News: S2K Rear caliper piston is 40.5mm and TL-S rear caliper is 38mm. Brake bias should barely be noticeable with this brake setup.

***Updated first post****


Also if there is something that doesnt look correct please point it out.

User 121020

40.5mm piston = 1288 mm^2
38mm piston = 1134 mm^2

That's a 12% reduction in area. I guess it's all in how you define "barely noticeable".

cheddaboy

True. Now im not a brake engineer or anything but I would think that if I decided to go with the 12.2 TL rotor from Racing Brake and stick with the stock rear brakes, the brakes would be improved overall. The rear OEM caliper would have 12% increase over the TL rear caliper.

vr0om

sub'd

User 121020

True. Now im not a brake engineer or anything but I would think that if I decided to go with the 12.2 TL rotor from Racing Brake and stick with the stock rear brakes, the brakes would be improved overall. The rear OEM caliper would have 12% increase over the TL rear caliper.
[/quote]
What this thread is grasping at is the comparison of [rotor radius X piston area X coefficient of pads] for various setups. I labeled the resulting value the "torque factor" for a given brake setup. Those are the primary parameters needed to determine friction torque of the brake system. Anytime one of those variables changes, you need to reassess the torque factor.

If you decrease piston area, increase rotor radius and maintain the same pad material coefficient of friction, the braking torque could remain constant. Looking at the numbers will give you an analytic comparison instead of an educated guess.

Determining the proper rotor radius to use is not as easy as taking the rotor diameter divided by 2. You need to consider where on the rotor the pads will sit. Then you need to determine the centroid of the pad face. Note: centroid does not equal the average of the inner pad radius and outer pad radius. The shape of the pad is important. The distance between the rotation axis and the centroid point is the effective rotor radius.

Using terms and phrases like "brakes would be improved overall", "barely noticeable", etc. are subjective for comparison of braking systems. Show the numbers, test the setups and let the numbers do the talking. Other characteristics you'll want to document are consumable part costs, weight of components, availability of consumables, etc.

If done properly, there are probably some cool brake conversions out there.