Quote:
Originally Posted by finch1750
does anyone actually have the piston size from the RR kit or is it still just taking their word for it?
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They use the standard Wilwood caliper piston sizing.
6 pot, 1.38 inches first piston, 1.12 inches 2nd and 3rd pistons.
4 pot, 1.25 inches on the 4 pot sport kit.
Rotor sizing is published on their website but it's just a standard STI rotor.
Quote:
Originally Posted by churchx
RR IS reasonably priced. And their bias seems no that bad off as some of retrofits. BUT - if even vendor says that for proper use one needs to use different pads front-rear, i translate it "we didn't care about getting right bias, so use this hack to workaround" putting big red sign against considering them. I get if such hack is used for retrofits, i get it if used for non-standard aero / staggered wheel & tire setup .. but NOT if for standard set marketed for most cars, without clearly stating if it's for some specific setups.
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There is some context to this statement which I think is important. RR Racing seems to be of the opinion that our cars benefit from additional rear brake bias even when stock. They have recommended people with stock cars to have more aggressive pads in the rear. That is part of the reason why their rear kits send the bias so far backwards. While I don't think having additional rear bias will hurt, I don't really agree with the statement due to the overwhelming body of information and experience that says the OEM bias is pretty much optimal and honestly, I think it was just a marketing grab to get people to buy the rear kits.
Regarding the price point, it's clear to me that using standardised parts is how they achieved the price point they have. Unfortunately, this does mean that things aren't perfect and their front kits DO have a small forward bias shift when used with OEM rears. @
JRitt ran the numbers in another thread that I can't be bothered to find right now where he saw around 3% bias shift forward on the 6 pot kits and 5% bias shift forward on the 4 pot kit. He was of the opinion that it was a bit too far forward for their customers who track at the highest levels of HPDE and motorsport but I think it would be perfectly adequate for the remaining 9/10 customers.