Gt rotors on St, Will I need new calipers? Options

[Jeremy1210]

I want to buy the slotted rotors that are for sale on ebay, but they say they are for Gt. I thnik I have read that the GT rotors are bigger,if that is true, will I need new calipers?

[SpedToe169]

Good points KC. Let me add some.

Anytime you change the braking potential at one end of the car or the other, you HAVE to change brake balance to keep the braking balance correct. This is done with an adjustable proportioning valve and is VITAL to non-stock brake systems. It also has to be set up correctly which can take some time and patience in a big deserted parking lot (or a race track if you have one handy ) but its not hard to do.

Secondly, the speed that the rotors are turning doesn't make any difference in braking performance. Its dependent upon the coefficient of friction of the pad/rotor interface (this changes with temperature), the area of the interface, and the pressure being applied to press the pad against the rotor. Bigger rotors work better because they have more mass, more mass means that they're bigger heat sinks, that means that they can absorb more energy before they get too hot and start to overheat the pad (this is a very high temperature >800F for most street pads ~1400F for real race pads). The larger rotors also create more of a negative torque acting to slow the car, so they don't have to work as hard to do the same amount of 'slowing'.

And lastly, KCGT had a very good point about the pads being different. I can attest first hand that the ST and GT pads are different, so the calipers are also different.

This post has been edited by SpedToe169: Aug 12, 2003 - 11:14 PM