Fred,
Good point. With the VG30 it shouldn't add more than 150
pounds, really not that much than having a passenger along
with you. So for the weight increase with V6 engine really
shouldn't require larger brakes.
The R4S brake pads are from Porterfield. Details about their
brakes can be found at: http://www.porterfield-brakes.com/pads.htm
While they do not list roadster pads or shoes, they can be made up.
I believe they run about $100/pad set $80/rear shoes.
Personally I am not running the Porterfields, but have been impressed
with them on the cars that I did get a chance to compare with.
Heck, my roadster hides in the garage too much to need brakes! <grin>.
With the unsprung weight, as Gary pointed out the lighter the unsprung
weight, the better the tire can follow a bump, rise, or drop. Improved
handling. Also with ROTATIONAL WEIGHT, such as the brake rotor,
wheel, and tires they weight has a huge impact on performance. Typically
for rotational mass one pound rotational is similar to eight pounds total
weight. While the rotors add some weight, it is interesting to note that
different wheels/tires can add 10 pounds to each wheel. This can add
up to a huge difference in 40 pounds, which can "feel" like an extra 300+
pounds in dynamic situations. Worth finding the lightest wheels/tires possible
for those Autox events. [Lightest wheel for a roadster is about 12 pounds,
heaviest is around 19 pounds. Tires themselves can vary quite a bit between
different brands.]
Cheers,
Tom Walter
Austin, TX
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