Also, here are the specs for proportioning valves (at least for '91-92)
5S-FE -- linear to 30kg/m squared with 60 to rear at 80
3SGTE -- linear to 60kg/m squared with 84 to rear at 100
So how it reads is that for 5sfe, it's linear to 30kg/m^2 with 60kg to rear at 80kg sytem pressure and so forth.
Eggroller had compiled some information on piston area:
91 n/a front caliper has one 51mm diameter piston per side = 320.442mm^2 area
91 turbo front caliper has 2 36.5mm per side = 458.673mm^2 area
93+ turbo front caliper has 2 36.5mm per side = 458.673mm^2 area
91 rear calipers has one 41.3mm per side = 259.496mm^2
99+ turbo rear calipers has one 42.9mm per side = 269.549mm^2
hmm so since the front turbo 91 calipers are the same size as the front 93 turbo calipers, would the rotors fit too? or would there be really no difference in braking?
i have 91 turbos in front and 93s in rear just curious if it would affect braking much.
'91 turbo and '93 turbo front calipers are not the same size. The area for the piston is the same. The '93 turbo rotors are thicker as well as larger in dia. The '93t calipers are wider to fit the thicker rotor. The brackets are different to accomodate the larger dia rotor.
The '91-92t and all NA have the same rear brakes (rotor, caliper, bracket). All models have the same rear brake pad. I do not know if the '93t rear calipers are the same or not.
If you have '93 NA rears, then you are fine. You basically have '91-92t brakes minus the brake prop. valve. If you have the '93t rear brakes, then you have a slight rear bias. This may not be ideal since you may lock up your rears too early and not getting maximum braking. Also if this happens when not pointed straight could lead to exiting the road back end first.
Since this is true couldnt you use 91t calipers on 93t Brackets and 93t rotors since the brackets accomodate the larger rotors? I remember a while back that someone was saying that I could get 93t caliper brackets and the 91t rear caliper fits right on thus allowing the extra room now for the larger diameter of the 93t rotors. Can anyone verify this for sure? The only downside I can think of is that you might have to shave the brake pads a little to fit the thicker rotor, but we arent talking much here(5-6mm so 2-3mm per pad tops).
This may work for the rear brakes. But not the front. MAYBE you might be able to just slide the backing plates into the '91T calipers onto a '93T rotor. The rotors are much thicker. Hence the hefty weight too.
maybe im confused here. i just invested in rear hubs and brakes from a 93t to install on my 91t. according to this thread, i just wasted my money. can someone put it dee dee dee terms for me???
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