conclusive on-track testing of Speed Engineering Directional Vaned Brake Rotors
05-15-2011, 05:58 PM
#41
Registered User
Very cool exercise.
As others have said: It would have been cool to see data from lap 10 or 15 (straight running) to see how high the rotor temps got before reaching equilibrium, which will likely be above 1,000*F and probably closer/mid-way to 1,500*F.
Billy
That's a good question.
The plotted graph is a complete lap of the 21 turn road course. At the end of each lap, the rotor (either factory or Speed) was always hotter than when it started the lap. We chose two laps that were the most consistent in lap time and average vehicle speed. We also chose the laps that started the lap closest in initial rotor temperature for the best comparison. The rotors would stack on more temperature each lap, the factory rotor at a greater rate. This would explain the onset of brake fade we felt with the stock rotors as they exceeded either the brake fluid or brake pad's temperature threshold.
-- Chris
The plotted graph is a complete lap of the 21 turn road course. At the end of each lap, the rotor (either factory or Speed) was always hotter than when it started the lap. We chose two laps that were the most consistent in lap time and average vehicle speed. We also chose the laps that started the lap closest in initial rotor temperature for the best comparison. The rotors would stack on more temperature each lap, the factory rotor at a greater rate. This would explain the onset of brake fade we felt with the stock rotors as they exceeded either the brake fluid or brake pad's temperature threshold.
-- Chris
Billy
05-24-2011, 08:51 AM
#42
Former Sponsor
Thread Starter
Just a reminder that there is one week left for 20% off rotors & package discounts:
https://www.s2ki.com/s2000/topic/862...nted-packages/
-- Chris
https://www.s2ki.com/s2000/topic/862...nted-packages/
-- Chris
05-24-2011, 09:24 AM
#43
Former Moderator
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I really wish I would have known about that package deal... my fault for not browsing more.
An big appeal to me for these rotors is that even if they don't improve cooling over a factor blank with ducts, I don't want to use ducts. We have a slew of Miatas as the serious track rats, but I'm getting into tracking my S2000 just for fun this year. My S2000 is a street car that I'll do track days just for fun in. Before an HPDE, I can swap on a set of these rotors and some good pads, after the event, go back to a street pad on the stock rotors and never have to worry about running ducts. I just simply don't WANT to run ducts. I think these are a great idea. I'm really glad something like this exists and I can't wait to try them out.
An big appeal to me for these rotors is that even if they don't improve cooling over a factor blank with ducts, I don't want to use ducts. We have a slew of Miatas as the serious track rats, but I'm getting into tracking my S2000 just for fun this year. My S2000 is a street car that I'll do track days just for fun in. Before an HPDE, I can swap on a set of these rotors and some good pads, after the event, go back to a street pad on the stock rotors and never have to worry about running ducts. I just simply don't WANT to run ducts. I think these are a great idea. I'm really glad something like this exists and I can't wait to try them out.
05-24-2011, 10:11 AM
#44
Administrator
exactly, the test with lots of fancy graphs fails to show any tests of the -actual- problem w/ oem rotors....
05-24-2011, 10:30 AM
#45
Former Moderator
I was cracking stock and Centric rotors every 2 to 4 track days when I gave up and switched to RacingBrake.com rotors. My first set lasted 24 track days, a full and busy season, before a small crack propagated to the outside edge--no giant crack like the stock failure mode.
05-24-2011, 12:05 PM
#46
Former Moderator
Originally Posted by hondaf1' timestamp='1305201648' post='20567190
i think the true test of these SOS rotors would be to have someone who were cracking OE rotors every 4 track days or so, and see if they can get more than that before the rotors crack.
exactly, the test with lots of fancy graphs fails to show any tests of the -actual- problem w/ oem rotors....
Our test was a failure since the 1500 degree brake probe didn't ship in time and mine only goes up to a 1000 degrees which wasn't enough for the APM's or Centrics but the APM's didn't show signs of warping or dishing like the Centrics and they also don't have any micro cracks like the centrics do.
The reason why they don't dish is due to the holes in the hub area which weaken the area so that it acts more like a floating rotor, the friction surface is then allowed to expand more freely vs the oem/centrics where there is no give in that section.
As with anything, I'm sure someone can take the APM's out and crack them in a day if they don't let them cool enough before parking their car after each session.
The pedal feel was more consistent with the APM's most likely due to the dishing is my guess. I'll keep running them and hopefully we'll get another chance to test them against the centrics.
05-24-2011, 12:10 PM
#47
Administrator
you don't need any fancy probes. you just need to count the number of track days it takes you to crack them vs the number of track days it would take for you to crack oem ones. If they last at least 2-3x as long then you know.
05-24-2011, 12:20 PM
#48
Former Moderator
I'll let you know how long they last and as of now they look like they'll last longer but who knows by how much, time will tell.
05-24-2011, 12:46 PM
#49
Administrator
unless the brakes are getting stupid hot (which they're not because we'd all be complaining about the brakes sucking to stop the car) and the pads you're running handle the brake temps you're seeing. how hot they run doesn't really matter.
05-24-2011, 12:53 PM
#50
Former Moderator
Time will tell if the theory is correct though.