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Originally Posted by Targa250R
None. There is no difference in braking whatsoever by swapping drums to discs in the rear of a Civic - and testing has backed this up. The main benefits of discs are better heat dissipation, better friction compound selection, and ease of maintenance. Many also prefer them for appearance purposes.
Street driving actually requires more brake heat capacity than regional Solo autocrossing does. If you don't think it is worth it for the street, then it isn't worth it for autocrossing either.
Autocrossing has completely different brake requirements vs. track days. For autocross, the weight benefit of smaller brakes is typically more important, whereas for track days, the heat capacity offered by more massive brakes is typically more important.
Um, no. That's way too general of a statement to be accurate. I know the point you're getting at, but you've misunderstood it. This is not true.
No, you're wrong. The ubiquitous 4x100mm 9.5" solid rear disc setup with 7CLP13S calipers weighs at least 7lbs more per side than standard Civic drums do. Thats a gain of 14+lbs of unsprung mass.
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Street driving does not require more heat capacity. It requires more initial bite for safety. Highway or high-speed driving does though, perhaps thats what you meant. Otherwise auto-cross requires more , but it also depends on the course. Some courses you can get away with very little braking , others theres a lot of it. So thats hard to say either way.
Drums , seem to be a bulkier system. Therefore a weight gain or loss isnt exactly straight cut one to the next , a more compact system (brake rotor and caliper) can perform the same given its smaller. But at that weight difference its hard to say at that point. Most likely your right , but just wanted to note that when it comes to unsprung weight it all depends on where the weight is at. Like they say , spin in a circle with your arms out , now pull your arms in. Same weight , much easier to spin with the arms in.
Another side thought though is rear brakes really do nothing for power , if a rotor system can brake more effectively it would be nothing but a weight gain. The other non-benefit to the rear would be the unspung weight on the actual suspension. Which 14lbs is quite a bit , but its nothing to write home about , the performance difference is negligable either way , but in theory it is something. Is it enough to show up in a 1/4 mile , perhaps. How much , who knows.