Quote:
Originally Posted by silver240esex
I beg to differ on the brake bias point. Sure it's different but z32s would'nt be such a popular upgrade if they didn't perform. Brake bias according to another post on stock brakes is about 70/30, Q45 is about 68/32, and Z32 is about 66/34. Yes the bias is different but you have to remember that stock brakes are pushing two pistons in the front, and two in the rear, while Q45s use four front, two rear, and Z32s push eight front, four rear. I'm no expert but I cant help but think that the reason for less bias up in front is due to the fact that since there are more pistons to do the job, less bias is needed to see equal or better results than a Q45 set-up, giving you an overall stronger braking system. I run R33 GTS-T brakes with a Z32 BMC and I love them! No problems whatsoever.
As far as what brakes are right for you, there are many factors that determine the perfect choice for YOU. Both will caliper upgrades will provide you with good results. It depends on how far you will be going with your driving of course that may determine the better choice. You may need to get larger wheels for the Z32s if you're running a 15" wheel but if you plan on getting wheels later, the Q45s stock and wimpy appearance may not compliment your wheels like Z32s will. I'd just go Z32 but only you can decide what is most important.
 |
Maybe you dont know this but sliding calipers are equal to 2 times the amount of pistons you see (the slider is equal to two pistons in the case of the Q45) and the amount of pistons means nothing, the reason for more pistons is to allow for a larger pad surface, the more pistons, helps put the pressure uniformly accross a larger pad.
Q45 front = 2 pistons + 2 (dual slide) = 4 piston
Z32 front = 4 pistons (quad fixed) = 4 piston
stock front = 1 piston + (single slide) = 2 piston
Q45 rear = 1 pistons + 1 (single slide) = 2 piston
Z32 rear = 2 pistons (dual fixed) =2 piston
stock rear = 1 piston + 1 (single slide) = 2 piston
*sliding calipers are times two the amount of pistons that you actually see
Q45 front brakes (CL26VF):
- Two piston sliding caliper
- 42.8 piston diameter
- 280mm diameter rotor
- 56mm wide pad
- effective rotor diameter: 280-56 = 224
- effective piston area: 42.8^2 x 2 x 2 (sliding caliper) = 7327.36
- brake torque =
1641328.64 (winner)
vs
300ZX front brakes (OPF25VA):
- Four piston fixed caliper
- 40.45 piston diameter
- 280mm diameter rotor
- 50mm wide pad
- effective rotor diameter: 280-50 = 230
- effective piston area: 40.45^2 x 4 (fixed caliper) = 6545
- brake torque =
1505350.00 (losser)
For the record I run Z32 30mm calipers on my S13 only for the better looks + I run Z33 12.76" rotors with SPL adpater bracker so my front brake torque is actually greater than the Q45 somewhere around 1793330 if you do the math.
Credit goes to ASAD from FA for putting the above info together