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Our Pro5000 Radi-CAL BBK's featuring the new monster 372x34mm, 84 vane discs are now available to order for the C5, C6, and C7! These fit all trim levels, including the base cars, Z51, and Z06 (including the C7 Z06). They will start shipping early next week.
To make things easier, below is the complete list of options for each chassis. When ordering, please carefully note the caliper number (CP9660 (18mm thick pad) vs. CP9668 (25mm thick pad) and disc size (355x32mm vs. 372.x34mm).
Sean, is this something that you pieced together as I thought the kit came with 355mm rotors or is this a new package that Essex is offering?
We offer off-the-shelf Radi-CAL Pro5000R kits with either 355x32mm, 72 vane or 372x34mm, 84 vane discs. That is the case for all C5, C6, or C7's, and for any trim level (base, Z51, Z06, etc.).
We offer off-the-shelf Radi-CAL Pro5000R kits with either 355x32mm, 72 vane or 372x34mm, 84 vane discs. That is the case for all C5, C6, or C7's, and for any trim level (base, Z51, Z06, etc.).
Thanks Jeff & RagingGrandpa
Jeff one of these days I'm going to have to give you a call to get some in depth information about how these calipers and the pad surface area compare to OEM ZR1.
CP9660 Pro 5000R RadiCals + CP5040s on C6 Base Coupe
Called Jeff Wednesday morning last week to discuss brake upgrades for the off season -- my final track event of the year was the TCUSA Full Throttle Fall Fest at VIR 21/22-Nov.
The car is a 2006 C6 Base Coupe that runs ~15 days a year mostly at VIR with some time trialing. 3350 lbs with driver and 380 rwhp. I had been running the Hardbar/AP T1 kit with the CP8350 calipers on 325mm rotors since 2010.
I had become more and more dissatisfied with the stock rear brakes and wanted to upgrade. The car is street legal and still sees some street duty, so keeping the parking brake was a must-have.
After discussing the options with Jeff, I picked the CP9660 Radi-Cals with 355mm rotors and CP5040s with 340mm rotors. Since I live 100 miles from Essex, this is what my garage looked like Thursday night:
Here's where the plan changed. I live 60 miles from VIR, so if I took Friday off work I could install these and still get to the track in time for tech. Unable to resist that temptation, the whole kit was installed and ready to drive by 2:30pm on Friday.
CP9660s on the front. Wheels are CCW Corsair C14 18x10.
CP5040s on the rear (CCW Corsair C14 18x11)
Here is a "before" photo of what the car looked like with the Hardbar/AP T1 kit, CP8350s, stock base coupe rotor sizes, and the same CCW Corsairs:
And here is the "after" photo sporting the CP9660 Radi-Cals, CP5040s, and C6Z06 rotor sizes:
I ran the exact same pad compounds as before: Ferodo DSUNOs up front with Ferodo DS1.11s on the rear. The first thing I noticed was how quiet the new setup is -- no floating rotor chatter and very little squeal. Even at track temps, the old setup would squeal so loudly that the corner workers would react to it.
Pedal feel was also dramatically different. Standing still you could mash the brake pedal and hear the stock rear calipers flex and groan. Absolute silence with the new setup. On track this translates into a brake pedal that as soon as you touch it you are engaging the brakes. This difference means that all my brake marker habits at VIR need changing as I am effectively braking almost a marker sooner than before. Modulation and consistency were much improved.
Before I was cracking the two piece 325mm rotors after about 12 track days. After a single two day event I could see heat checking. With the extra capacity of the new system you have to look very, very hard to see any evidence of heat cycling on the rotors.
This new setup is amazing. Really hoping for a short off-season now so I can play with these some more.
AP Racing Radi-CAL's and J Hooks had a great weekend of racing! They took the 1-2 at the 24 Hours at Daytona over the weekend. Also, Bill and Chuck from this forum took the second and third podium slots with our Pro5000R Radi-CAL kits over the weekend in NASA racing at Cal Speedway. Congrats to all!
Last edited by JRitt@essex; 02-02-2016 at 08:24 AM.
AP Racing Radi-CAL's and J Hooks had a great weekend of racing! They took the 1-2 at the 24 Hours at Daytona over the weekend. Also, Bill and Chuck from this forum took the second and third podium slots with our Pro5000R Radi-CAL kits over the weekend in NASA racing at Cal Speedway. Congrats to all!
Wow, congrats Essex and AP Racing! So awesome to be running the same technology as the winning C7R's! And for price that a mere mortal club racer can afford.
We raced the first round of the SCCA Majors this weekend at Cal Speedway and as you said, Chuck and I took podiums. That track is a real test of braking with several high speed sections connected by tight corners. The brakes have to repeatedly handle going from 150 mph to 50, then 100 to 50, then 120 to 45, then 130 to 50 lap after lap. It's a different test than Laguna which never gives your brakes a chance to cool, but is a lower speed track. Cal Speedway gives your rotors time to cool but then punishes them repeatedly with these high speed brake zones. I had slightly less power this weekend than I did 2 years ago yet I turned nearly 2 seconds per lap faster times and a lot of that was the AP brakes. I was pulling 1.2 to 1.3 longitudinal G's in the brake zones which I think is the highest I have ever seen in my car as I pushed the braking zones deeper, and I never had a lockup or soft pedal lap after lap. I am super happy with these brakes.
I was nervous going down there that I only had the original set of Hawk pads that came with my calipers before nationals last year and they have several race weekends on them now. I wasn't sure what Cal Speedway would do to them, but looking at my brakes now, I think I can go at least another weekend! And the rotors still look great.
Here's a nice vid of our CP9668/372mm setup on a C7 Z06 running down some Porsches at a Summit Point PCA event. Check out how much time he gains under braking at 5:25, 9:33, 12:15, and 17:30. Also, I never thought of Summit Point as a 150mph track! :O
Some comments from the owner:
First impressions, this kit certainly looks impressive. The calipers look like artwork and the pads are massive. I rolled up to tech inspection at the track and the guys working were trying to figure out whether that really was the pad or a part of the caliper. What I noticed though were the little things. Put a box end wrench on the stock bleeders and then put it on the bleeders on the AP racing caliper. The AP Racing ones fit the wrench like a glove with no play and the metal actually feels harder than the stock (or even other aftermarket) bleeders. Are they really chrome? Yup.
I usually instruct or run in the advanced group and my first event with these brakes I went out with the goal to flat out abuse these brakes and see if I could break them. Tried as I might I never had a hint of fade and I before long was in the gas longer, braking harder, and later than I ever had. The brakes flat worked without any fade or long pedal. I've run 12 track days since and they are just awesome. - See more at: http://www.essexparts.com/news-blog/....Si5kK3J9.dpuf
At one time you were going to put a list on your website of which wheels clear which caliper. Do you have such a list for the C6 Z06?
I do not unfortunately. That's something we're still working on. Sorry! The wheel fitment templates are all below. What wheels did you have in mind? I might know off the top of my head. Thanks.
Below are all of the wheel fitment templates for all of the Pro5000R Kits: CP9660 Wheel Fitment Templates
10-26-2015, 01:57 PM
Also, I never thought of Summit Point as a 150mph track! :O
