Dyno testing light weight rotors?
Mar 30, 2010, 11:34 PM
#1
Dyno testing light weight rotors?
Quite a few of you have been following Shawna's Evo and the Tests we have been using it for. Last week she told me it was in need of brakes.
A while back we opened an account with Baer while they were still selling their two piece Evo rotors (two years ago). When we did that we purchased what we were told was the last of them. While I knew that's what I wanted to use for this project, they were simply not available any more. Long story short a quick phone call to Baer got us a few sets of rotors at our door a couple days later. They never put them back into production but "found" a few more rotors and decided to make hats for them.
Today we decided to test them, just as David did before. I remember a bunch of people not believing his tests before so we decided to do it again! This is what we found.
We strapped the car down and did a pull with the stock rotors: 313 TQ / 327 HP
Then actually jacked the car up ON THE DYNO and changed the rotors and ended up at 339 HP / 319 TQ. That's +12 HP and +7 TQ.
Weight:
Baer Front Rotor: 15.8 vs stock 17.75 = 1.95 each
Baer Rear Rotor: 11.75 vs stock 14.45 = 2.70 each
9.3 pounds of rotational weight savings going from a half worn set of stock rotors to these.
Changing the rotors right on the dyno:
Stock Fronts:
New Front Baer's:
Stock Rear's:
New Rear Baer's:
A while back we opened an account with Baer while they were still selling their two piece Evo rotors (two years ago). When we did that we purchased what we were told was the last of them. While I knew that's what I wanted to use for this project, they were simply not available any more. Long story short a quick phone call to Baer got us a few sets of rotors at our door a couple days later. They never put them back into production but "found" a few more rotors and decided to make hats for them.
Today we decided to test them, just as David did before. I remember a bunch of people not believing his tests before so we decided to do it again! This is what we found.
We strapped the car down and did a pull with the stock rotors: 313 TQ / 327 HP
Then actually jacked the car up ON THE DYNO and changed the rotors and ended up at 339 HP / 319 TQ. That's +12 HP and +7 TQ.
Weight:
Baer Front Rotor: 15.8 vs stock 17.75 = 1.95 each
Baer Rear Rotor: 11.75 vs stock 14.45 = 2.70 each
9.3 pounds of rotational weight savings going from a half worn set of stock rotors to these.
Changing the rotors right on the dyno:
Stock Fronts:
New Front Baer's:
Stock Rear's:
New Rear Baer's:
Last edited by EmeryatSTM; Mar 30, 2010 at 11:38 PM.
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Mar 31, 2010, 06:58 AM
#11
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Would love to see the HP difference with the AMS drag kit. Hey Em, whats the weight diff. between the Brake Man and AMS drag brakes?
Last edited by warp9; Mar 31, 2010 at 07:10 AM. Reason: added question
Mar 31, 2010, 08:34 AM
#14
As a rule of thumb, the farther it is from the hub, the more difference it makes. So in terms of impact tires are first, followed by wheels, then the rotors. Herein lies the irony in folks installing very aggressive wheel/tire combos, hoping to make their cars look faster, when they're actually making the cars run slower.
