AP Racing Big Brake Kit Installed!

Ken in AZ · 08-12-2009, 06:22 PM

Quote:

Originally Posted by boosted180

hey travis. glad to hear the bbk completely eliminated your brake problems. can you explain a little more about how it's doing this? from the specs, it doesnt look like the kit is that much bigger than the sport brakes which are already pretty huge (14.25" vs. 14"). from comments made in other threads, it seemed more of an abs/ brake assist problem than with the actual calipers/ rotors/ pads themselves. would the 1/4" increase in rotor size make that much of a difference in heat dissipation to prevent the problem?

i'm kind of hesitant to do a bbk b/c of the cost, but if that's the only way to solve this problem, then i guess i dont have a choice.....

One thing to notice on the stock rotor versus the AP racing rotor is the fact that the AP kit uses a different internal vane structure that acts like a fan to draw the air from the inside of the rotor to more aggresively assist in the brake rotor cooling.

The stock rotors do this too but on a much smaller scale than the AP's. Couple this with the much larger mass of the stock rotor and yes they take longer to heat up but once they are hot - they will stay hotter longer making it more difficult to dissapate the heat.

Also as Travis points out - there is more pad contact with the rotor on the AP's - therefore there is less heat built up during brake pad application.

I'm sure someone with an engineering degree can come in here and explain better than us - but overall these are the contributing factors.

Oh - and I have the 370z sport akebono's on my 06 M45

Lovin every minute of em

Ken

RCZ · 08-12-2009, 10:13 PM

Quote:

Originally Posted by Ken in AZ

One thing to notice on the stock rotor versus the AP racing rotor is the fact that the AP kit uses a different internal vane structure that acts like a fan to draw the air from the inside of the rotor to more aggresively assist in the brake rotor cooling.

The stock rotors do this too but on a much smaller scale than the AP's. Couple this with the much larger mass of the stock rotor and yes they take longer to heat up but once they are hot - they will stay hotter longer making it more difficult to dissapate the heat.

Also as Travis points out - there is more pad contact with the rotor on the AP's - therefore there is less heat built up during brake pad application.

I'm sure someone with an engineering degree can come in here and explain better than us - but overall these are the contributing factors.

Oh - and I have the 370z sport akebono's on my 06 M45

Lovin every minute of em

Ken

Kinda-almost, the larger mass doesn't perform better because it takes longer to heat up per se, it performs better because the heat is spread across a larger area and because the larger surface area allows for for more efficient heat dissipation. In a way that does allow it to take longer to heat up, but not in the way you were thinking.

As far as less heat being created because of the larger pad...the pads on the AP Kit have a much higher coefficient of friction and since braking force (or grip for that matter) is a product of pressure and the coefficient of friction, they require less pressure to create the same amount of braking force.

The internal vanes (cooling) + the greater mass of the rotors (cooling) + the slotted pattern on the rotors (cooling) + the grippier pads (friction) = a system that can dissipate a whole lot more heat and produce more clamping power per applied pressure than the stock setup.

I studied business management in college though..

PS: Travis those things are beautiful.

travisjb · 08-12-2009, 10:41 PM

Quote:

Originally Posted by RCZ

PS: Travis those things are beautiful.

Thanks! I'm psyched to test these out for you all and share my thoughts, data and pics. Let me know if any other questions.

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