Go Back  S2KI Honda S2000 Forums > Marketplace > Sponsor S2000 Suspension, Brake and Handling Deals
Reload this Page >

Launch Buy for URGE EssexParts designed 4 Piston Radical Kit

Sponsor S2000 Suspension, Brake and Handling Deals Sponsor deals on S2000 suspension and S2000 handling products

Launch Buy for URGE EssexParts designed 4 Piston Radical Kit

 
Old 06-23-2019, 07:02 AM
  #1  
Sponsor
Thread Starter
 
Urge's Avatar
 
Join Date: Sep 2003
Location: TX
Posts: 2,371
Likes: 0
Received 9 Likes on 8 Posts
Default Launch Buy for URGE EssexParts designed 4 Piston Radical Kit

We are excited to announce a new AP Racing Radical 4 Piston designed by EssexParts, spec'd and distributed by URGE designs.

The primary URGE designs philosophy is weight reduction while improving performance and this AP Racing Radical Brake Kit is the lightest brakes kit with >330mm disk.

Lightweight
  • 4 piston calipers provide optimal clamping force for the S2000 <3000 lb total weight and typical power range of 250-600 HP
  • 4.85 lbs caliper >50% lighter than OEM caliper and 20-30% lighter than aftermarket 6 piston calipers
  • 338 x 26mm disc weighs about the same of OEM with significant cooling increase
Increase performance
  • Radical Pro 5000R 4 piston Caliper design is typically 30% stiffer vs other aftermarket calipers improving brake modulation and feel
  • Spiegler Stainless brake lines improving brake modulation and feel
  • Stainless Steel caliper pistons reducing heat transfer between rotors and brake fluid as steel has 15X less thermally conductive than aluminum
  • Scalloped pistons vent gases between the pistons and pads
  • 72 vane rotors significantly increase cooling over OEM 24 vanes and noticeably over other S2000 aftermarket kits at 48 to 70 vanes
URGE Essex Racking AP Racing Radical Brake Kit components
  • AP Radical Radical Pro 5000R 4 piston calipers CP9441 calipers
  • AP Radical CP7472 338x26mm rotors with Essex designed custom rotors
  • Speigler Stainless Steel Lines
$3800 Kit price
Launch price of $3420 or 10% off for Pre Sales only
Kits targeted to be shipped mid to late September

email us URGEdesigns(at)gmail.com to pre order



__________________


Urge is offline  
Old 06-23-2019, 07:04 AM
  #2  
Sponsor
Thread Starter
 
Urge's Avatar
 
Join Date: Sep 2003
Location: TX
Posts: 2,371
Likes: 0
Received 9 Likes on 8 Posts
Default

Pre Buy List 10 Spots, 3 SOLD
  1. TC
  2. JU
  3. CA
  4. Open
  5. Open
  6. Open
  7. Open
  8. Open
  9. Open
  10. Open
__________________



Last edited by Urge; 07-06-2019 at 10:07 AM.
Urge is offline  
Old 07-01-2019, 03:33 PM
  #3  
Registered User
 
Join Date: Oct 2017
Posts: 6
Likes: 0
Received 1 Like on 1 Post
Default

How do these match up size wise with the stop tech 328 for wheel fitment? I have a set of Volk CE28n on order size 17x9.5x50.
Nivlac978 is offline  
Old 07-01-2019, 03:48 PM
  #4  
Sponsor
Thread Starter
 
Urge's Avatar
 
Join Date: Sep 2003
Location: TX
Posts: 2,371
Likes: 0
Received 9 Likes on 8 Posts
Default

Originally Posted by Nivlac978 View Post
How do these match up size wise with the stop tech 328 for wheel fitment? I have a set of Volk CE28n on order size 17x9.5x50.
Clearance Template..
Attached Files
__________________



Last edited by Urge; 07-05-2019 at 05:39 AM.
Urge is offline  
Old 07-11-2019, 12:00 PM
  #5  
 
Join Date: Jul 2009
Posts: 124
Received 1 Like on 1 Post
Default

Just curious, why wasn't a rotor like the CP3908 used? 26mm seems to be on the skinnier side... is it just for the lighter weight (but at the cost of decreased thermal capacity)? What kind of guarantee can you give to show that these have sufficient thermal capacity?

Also, why the CP9441 over the CP9440? Seems like a smaller piston area on the 41 over the 40? Not to mention the piston sizes seem to be mismatched to our application on the 41
wowwitsgau is offline  
Old 07-11-2019, 08:22 PM
  #6  
Sponsor
Thread Starter
 
Urge's Avatar
 
Join Date: Sep 2003
Location: TX
Posts: 2,371
Likes: 0
Received 9 Likes on 8 Posts
Default

Originally Posted by wowwitsgau View Post
Just curious, why wasn't a rotor like the CP3908 used? 26mm seems to be on the skinnier side... is it just for the lighter weight (but at the cost of decreased thermal capacity)? What kind of guarantee can you give to show that these have sufficient thermal capacity?

Also, why the CP9441 over the CP9440? Seems like a smaller piston area on the 41 over the 40? Not to mention the piston sizes seem to be mismatched to our application on the 41
Great question.

Its all about right sizing the rotor for the application based upon vehicle weight and typically power levels.
First we look at our experience with our current non radical kit (still has the lowest replacement costs for pad and disc replacement) that uses a 299x32 rotor and weighs 10.7 lbs. When we first worked with Essex to select a rotor out of the vast AP Racing catalogue, we searched for racing applications that had similar weight and power goals as the S2000. Those rotors were typically used on lower level stock cars that weigh 2800 lbs and make 500 hp around short track ovals. One of the harshest braking environments in the racing world.
Same S2000 weight, stops 500 HP cars and figured that was a great match for the S2000. After 77 kits sold with no fading issues, I feel our design choice was spot on. FYI, we have had these rotors on 24 hour endurance S2000 with no issues.

So lets think about the CP3908, bigger rotor, holds more heat, great. Do you need it? We have proven you dont. So why put more weight and cost into your car? That is 10 more lbs of total rotational weight or 40 lb static weight equivalent.
Would you swap your Aluminum wheels out for Steel? The Steel wheels are stronger, more resistant to dents, less deflection? You wouldn't, aluminum wheels provide the strength and durability need to support your car and they weigh a lot less.
Also, If bigger rotors was better, then why the CP3908, why not the CP6572, its 380x34mm and weighs 22 lbs. At some point you cover the braking needs of the car and anything bigger is more weight and starts to become a weight penalty. The CP3908 is more of a weight penalty than braking need in our opinion.

So its about right sizing and not oversizing.
The new rotors are thinner, but have more radial depth and thus similar weight to our current proven rotors, plus they have 20% more vanes to improved airflow and cooling. The same amount of gains as the CP3908 as a mater of fact, with 4 lbs less weight.

As far as the Caliper, we want to match he brake force of the OEM system to not over trigger ABS. Brake force is radius times brake pressure. Since we have a larger rotor, we dont need to have as much caliper surface area.
By our math, this new system is closer to the stock total brake force than our current kit, which means less ABS engagement and more modulation.

I hope this answers your questions.
__________________


Urge is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
SakeBomb Garage
S2000 Racing and Competition
15
05-23-2019 05:26 PM
SakeBomb Garage
S2000 Brakes and Suspension
2
06-26-2017 05:13 AM
marcrx5
R&C Parts For Sale
3
03-14-2013 07:30 PM
BFKIESER
S2000 Under The Hood
2
10-28-2004 05:10 PM


Quick Reply: Launch Buy for URGE EssexParts designed 4 Piston Radical Kit


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands