- AP Racing CP9660 Radi-CAL calipers
- 372x34mm, 84 vane AP Racing disc
- Saves 23 unsprung lbs. from nose vs. OEM brakes!
- Clears the OEM Supra wheels without a wheel spacer
- Will fit behind many aftermarket 18" track wheels
- Every component designed to resist the heat of extended track sessions
- Pistons sized properly to maintain proper brake bias and work with the OEM master cylinder and ABS system
- Front kits designed to work with either OEM rear brakes or our rear AP Racing BBK
AP Racing 9660 vs 9668 Caliper:
- The primary difference between the 9660 and 9668 is width. Even though the mounting offset on both calipers is the same (making them interchangeable on the same disc), both halves of the 9660 are narrower than those of the 9668. When installed on the same disc as the 9660, the 9668 will sit 11mm further inboard, while also extending 14mm further outward towards the wheel spokes.
- The additional width of the 9668 was implemented to allow for a thicker brake pad. The 9668 leverages a 25mm thick pad, while the 9660 accepts an 18mm thick pad.
- The 9668 also offers a quick-change spring clip bridge option (included in the box), which allows for pad changes without the use of hand tools, while the 9660's bridge requires the removal of two hex-head bolts.
- The 9660 weighs a svelte 6.1 lbs. (2.78 Kg), and the 9668 adds roughly half a pound more at 6.7 lbs. (3.1 Kg). Both choices are incredibly lightweight vs. competing six piston calipers, which are commonly in the 8-12 lbs. range. A typical pad for the 9660 weighs 1.3 lbs.Four of them (enough for both front calipers) weighs 5.2 lbs. Pads for the 9668 weigh approximately 2.0 lbs. each, so a full set weighs 8 lbs. Therefore, the difference in caliper and pad weights per front corner for the 9660 and 9668 works out to roughly 2.0 lbs.
- The CP9668 was designed as an endurance racing caliper, hence the thicker 25mm pads and the quick-change bridge option. The pads in the 9668 will last longer, and they are quicker to change during a pit-stop. However, if you're running 20 minute HPDE sessions, the 18mm thick pads in the 9660 are going to be more than ample. While it's impossible to predict pad wear rates due to the huge number of factors involved, it's safe to assume that you'll get multiple days out of the 18mm pads in our 9660-based systems. The vast majority of OEM calipers actually use pads that are thinner than 18mm, so you're already going to have more pad thickness with the 9660 than you will with your OEM calipers. The 9668 simply adds a layer of overkill with the 25mm thick pads. For reference, the image below shows how the 25mm thick 9668 pads dwarf the 14mm thick 'padlets' from a C6 Z06 Corvette's OEM calipers.