Rear brake bias options
02-16-2014, 10:38 PM
#31
Racer
Join Date: May 2008
Location: Encinitas, ca PCA National DE instructor PCA San Diego chief driving instructor
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I have spent some time messing with this on my car and it works best with the prop valve removed altogether.
It's a stiffly setup '89 run on "square" Hoosiers or Hankoooks.
YMVV
It's a stiffly setup '89 run on "square" Hoosiers or Hankoooks.
YMVV
02-17-2014, 01:25 AM
#32
Keep in mind that the "right" bias changes as the grip level changes, so an advantage of an adjustable setup is that if you encounter rain or whatever you can adjust for it while in the car. You'll crush people who can't change their setup, especially if the weather changes during the race.
02-17-2014, 12:50 PM
#33
Rennlist Member
my experience with an 86 944 turbo non-ABS with Big Red front brakes, stock rears brakes, stock LSD
5/33 proportion valve - too much rear bias, would lock the rears and try to swap ends
5/18 proportion valve - less tendency to lock the rears
LS1 swap with hydroboost, no proportion valve - way too much rears. Rears lock quickly and feel loose
LS1 swap with hydroboost, Tilton adj valve - 1 notch from closed, bias now feels great
5/33 proportion valve - too much rear bias, would lock the rears and try to swap ends
5/18 proportion valve - less tendency to lock the rears
LS1 swap with hydroboost, no proportion valve - way too much rears. Rears lock quickly and feel loose
LS1 swap with hydroboost, Tilton adj valve - 1 notch from closed, bias now feels great
Looks like this bar reduces the bias up to 50% in either direction, can you confirm you're running 1 click away from reducing the rear bias a full 50%?
I'm not at all familiar with hydroboost. Is there a proportioning valve included in this system?
TIA
