Lifetime Supporting Member
Join Date: Dec 2011
Location: Tallahassee FL
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4370
On upgrading the S197 front brakes, Steve is totally correct on using the GT 11-14 front caliper bracket and rotors. Just install a new caliper bracket, larger rotors, keep your calipers and use the Bullitt OEM rims. Minimal cost. UHP summer tyres, drive Bullitt to the track, run it and drive home, all on the same wheels. Compatible with OEM anti-lock system, more brake torque, 2" GREATER heat sink (which a rotor is) and avoids the law of unintended consequences of vehicle modification. Less cost for pads and rotors. Take the front (and rear) dust shields off, they just hold heat and prevent cooler air from getting to the rotor insides. Put a set of GT500 front tie rod heat shields on instead. Save the tie rod bushings.
Perfect for HPDE Beginners and Novice Solo.
The next step is front cooling ducts. For novice solo to intermediate, look at the JLT 2.5" duct kit. It is perfect for HPDE. Nice front intake bezels. 2.5" duct is much easier to work with and JLT brake duct plate can be installed in conjunction with the GT500 tie rod shields. Others with 3"-4" ducts will claim greater air flow and closer tolerance to the rotor, but we are not racing, just gentleman enjoying speed together.
The above is perfect for a HPDE road course Beginner, Novice Solo and Intermediate.
OK, the Brembo 14" package is where the law of unintended consequences of vehicle modification takes control. It is where the track addiction takes control. Brembo, 4 piston instead of 2. Much bigger pad contact surface. Compatible with OEM antilock brake system. Beautiful black Brembo calipers. Dive deeper into turns and brake harder. But-
Cannot run Bullitt OEM rims, unless change to Ford Racing front hubs with ARP studs and 1" spacers. Only .25 ounce low profile wheel weights on outside line of Bullitt rims. For show and cruising, I run the Bullitt rims as set up above.
My mechanic will not sign off for a track event with 1" spacers, even the ARP. And every millimeter of tyre grip is critical. So, another set of rims For road course track, without spacers, Ford Racing 18/9.5 rims from the American Iron racing specs, which clear the Brembos without spacers. Still have to be picky on placing the .25 wheel weights on the rim outside line. So, another set of rims, with UHP Summer 300 UTOG or less tyres.
And another consequence of 14" Brembo with Bullitt rims on 1" spacers. Tracking at highway speed and rains sucks. Cause the rear end width is still OEM, now an inch narrower than front. This damn law of unintended consequences of vehicle modification!
How has BLLTT evolved now? Rear end upgrade. GT500 rear brake brackets using OEM calipers with 13.8" rotors. Hell of a heat sink, needed cause I run with the traction control on (computer is faster than me and BLLTT is prone to oversteer from solid rear axle). ARP studs, for 7/8" spacers for Bullitt rims for cruise and show and no spacers for track rims. Had to open differential and remove axles to install the caliper brackets. New seals, bearings. OEM L/S was slipping on turns. Boss Leguna Seca Torsen differential. Rebuild pinion, keeping OEM 3.73. The only thing old in the rear axle is the housing.
Results- 2 days last week at Charlotte Motor Speedway, running the new NASCAR roval.
Love the Torsen diff!Smooth in turns, no lurching like the OEM LS. Quieter on the interstate. LOVE the GT500 rear brakes. After cool down lap, rear rotors were 20-30 degree F hotter than front, instead of previous 50-80 F. And less nose dive in hard braking and better trail braking. Saved BLLTT when a crashed BMW came across the track line ahead of BLLTT on a blind downhill turn.
Bullitt HPDE are gentlemen learning driving skills, enjoying speed, playing nice together. Racing is when the driver is willing to drive their car off a cliff for a trophy.