Quote:
Originally Posted by Vracer111
If no need to worry about road salt and you care more about performance and plan on tracking go with the sprint kit; ~21lbs lighter unsprung mass compared to the Formula kit, cost is nearly $1000 less, and it has cheaper wear item replacement costs...
The only real advantage the Formula kit has over the Sprint kit is massive heat sink reserve from the disc mass and pad area which would be of benefit if you are making much more than stock power....if you are making close to stock power the weight penalty of the Formula Kit verses the Sprint kit is just really not worth it. Formula kit is chosen more for appearance (versus Sprint kit) unless there is a massive increase in the power level of the motor that could actually benefit more from having the Formula kit installed over the Sprint kit. The Formula kit will not slow the car down any better than the Sprint kit in nominal conditions and is more likely to have slightly increased braking distances over rough surfaces (due to unsprung mass penalty and the extra work the suspension has to do compared to the Sprint Kit)
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Let me clarify by saying I was speaking to the 4 piston Formula kit, which is what I assume the inquiry was about. The 4 pot Formula kit actually drops ~5lbs per corner, ~10lbs off the nose total, so it's around the same weight penalty as stepping up to the Endurance kit. The rotor is significantly thinner than the Sprint or Endurance kits, so less heat mass. It is also only ~$400 more than the Sprint kit. I also believe you need to add pads to the Sprint kit, but Essex will give you a reduced price on them. Here's the 4 piston Formula kit (appears to be mis-labeled as "Factory" kit):
http://www.essexparts.com/shop/compl...43mm-disc.html
I absolutely agree the Sprint kit is the way to go if it's not a 4 season vehicle or salt isn't an issue.