Weight saving on Rotors
Need some help with choosing rotors.
I'm currently running 04 STi rotors (5x100) on my WRX that is fitted with brembos. What would be a good alternative to save few kgs? Will I get some improvement by dropping 2-3kgs from unsprung weight? Some claim that each kilo of unsprung weight = 30kg in kerb weight. Sounds fishy. |
2 piece rotors are lighter by appx less than a kg ea, not much but will make a slight difference.
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2 piece rotors probably cost fair bit of coin. So, what about normal DBA rotors, are they any lighter?
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[QUOTE=Kai;839923]2 piece rotors probably cost fair bit of coin. So, what about normal DBA rotors, are they any lighter?[/QUOTE]
I wouldn't be surprised if they are heavier.. There is alot metal in the ventilation slots.... |
1 dba T3-4000 single piece rotor front 326 x 30 114pcd approx 9.5kg
1 dba t3-5000 two piece rotor same size approx 9kg 1 standard brembo rotor in same size approx 10kg |
I have wilwood 2 piece rotors front and biot 3 piece rotors rear. In my opinion it does make a difference. But its not a big difference.
But the claim of 1kg [i]unspung[/i] mass = 30kg regular mass is bullshit. Id say that 1kg [I]rotating[/I] mass is equal to maybe 3-4kg regular mass. At a rough guess. |
sounds interesting..
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[QUOTE=nick73;839925]1 dba T3-4000 single piece rotor front 326 x 30 114pcd approx 9.5kg
1 dba t3-5000 two piece rotor same size approx 9kg 1 standard brembo rotor in same size approx 10kg[/QUOTE] This was my 13" wilwood rotor when new. At 332x32 It is a few mm LARGER diameter than brembo, and also a couple of mm THICKER than brembo. And it wieghs 6.670kg, which is very light. The light wieght was great, but the down side is less thermal handling. And i actually upgraded to a 14" rotor because i was overheating the brakes at RAC once my driving skills improved. [IMG]http://rs292.pbsrc.com/albums/mm27/im_lunch_box/20131010_165416_zps999ebb05.jpg?w=480&h=480&fit=clip[/IMG] The Biot rear rotors (brembo 2 pot fitment) were also lighter than standard brembo rotors, but the dufference was not as impressive. |
Thats very light indeed. Do these come in 5x100 to fit Brembos? Did you buy them locally?
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[QUOTE=Kai;839945]Thats very light indeed. Do these come in 5x100 to fit Brembos? Did you buy them locally?[/QUOTE]
No. They are designed specifically to suit Wilwood 6 piston forged narraw superlites. FNSL6R. I bought them from USA. When i bought them, they came in 5x100 which i then had re-drilled for 5x4.5" by Russ Kapp. But i believe they now come on dual PCD from Wilwood. The lightness was great for responsiveness. But as i said earlier, because being light, the brakes overheat while racing. So i went up to a 14" Wilwood rotor. (355mm.) Being radial mount calipers, changing disc size is easy. Simply put spacers on the dog bones and swap out the disc rotor ring to bigger diameter |
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