Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - brake bias for cadillac caliper swap and other BBKs

Racecomp Engineering · 09-07-2016, 04:25 PM

One note, and something I've not seen mentioned on this forum (though it's mentioned in the Stoptech white paper linked in the OP's article)....

If you run very high grip tires, then you can potentially generate more forward weight transfer than on OEM tires. Essentially this means that the "ideal" brake bias for a car on hoosiers is not the same as it is for a car on OEM tires (or in the rain).

This is not to say that you should increase your front brake bias from OEM when moving to sticky tires. The OEM brake bias has other design considerations beyond just achieving the shortest stopping distance possible and the ABS system complicates things.

But a massive shift rearward can suck just as much as a big frontward shift. Small changes in bias can shorten stopping distances slightly and help a driver feel more comfortable with the car, but it's important to think about the complete picture.

A rearward shift can also be helpful if you're running aero that's actually effective.

- Andrew

09-07-2016, 04:25 PM	#17
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,520 Thanks: 3,542 Thanked 7,415 Times in 3,033 Posts Mentioned: 311 Post(s) Tagged: 9 Thread(s)	One note, and something I've not seen mentioned on this forum (though it's mentioned in the Stoptech white paper linked in the OP's article).... If you run very high grip tires, then you can potentially generate more forward weight transfer than on OEM tires. Essentially this means that the "ideal" brake bias for a car on hoosiers is not the same as it is for a car on OEM tires (or in the rain). This is not to say that you should increase your front brake bias from OEM when moving to sticky tires. The OEM brake bias has other design considerations beyond just achieving the shortest stopping distance possible and the ABS system complicates things. But a massive shift rearward can suck just as much as a big frontward shift. Small changes in bias can shorten stopping distances slightly and help a driver feel more comfortable with the car, but it's important to think about the complete picture. A rearward shift can also be helpful if you're running aero that's actually effective. - Andrew Last edited by Racecomp Engineering; 09-07-2016 at 05:41 PM.